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Quartz 任务存储JobStoreTX 持久化之RDB-源码分析

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Quartz 任务存储JobStoreTX 持久化之RDB:http://donald-draper.iteye.com/blog/2323297
前面我们研究了一下RAMJobStore,就是将任务存在内存,但这样当程序崩溃时,触发的任务容易丢失,而Quartz 任务存储JobStoreTX 持久化之RDB可以解决这个问题,今天我们就来通过源码分析一下,探个究竟。

//标准调度器工场
public class StdSchedulerFactory
    implements SchedulerFactory
{
  //初始化Quartz属性,线程池,线程数,线程优先级,job存储容器
  private Scheduler instantiate()
        throws SchedulerException
    {
    DBConnectionManager dbMgr;//数据库连接管理器  
    //初始化存储器
     String jsClass = cfg.getStringProperty("org.quartz.jobStore.class", org/quartz/simpl/RAMJobStore.getName());
        try
        {
            js = (JobStore)loadHelper.loadClass(jsClass).newInstance();
        }
	//加载lockHandler
        tProps = cfg.getPropertyGroup("org.quartz.jobStore", true, new String[] {
            "org.quartz.jobStore.lockHandler"
        });
        try
        {
            setBeanProps(js, tProps);
        }
        if(js instanceof JobStoreSupport)
        {
	    //加载lockHandlerClass
            String lockHandlerClass = cfg.getStringProperty("org.quartz.jobStore.lockHandler.class");
            if(lockHandlerClass != null)
                try
                {
                    Semaphore lockHandler = (Semaphore)loadHelper.loadClass(lockHandlerClass).newInstance();
                    tProps = cfg.getPropertyGroup("org.quartz.jobStore.lockHandler", true);
                    if(lockHandler instanceof TablePrefixAware)
                    {
                        tProps.setProperty("tablePrefix", ((JobStoreSupport)js).getTablePrefix());
                        tProps.setProperty("schedName", schedName);
                    }
                    try
                    {
                        setBeanProps(lockHandler, tProps);
                    }
                    ((JobStoreSupport)js).setLockHandler(lockHandler);
                    getLog().info((new StringBuilder()).append("Using custom data access locking (synchronization): ").append(lockHandlerClass).toString());
                }
        }
    //通过PropertiesParser-cfg获取db数据源配置相关属性
     String dsNames[] = cfg.getPropertyGroups("org.quartz.dataSource");
        for(int i = 0; i < dsNames.length; i++)
        {
            PropertiesParser pp = new PropertiesParser(cfg.getPropertyGroup((new StringBuilder()).append("org.quartz.dataSource.").append(dsNames[i]).toString(), true));
            //获取数据连接管理器
	    String cpClass = pp.getStringProperty("connectionProvider.class", null);
            if(cpClass != null)
            {
                ConnectionProvider cp = null;
                try
                {
		    //加载ConnectionProvider
                    cp = (ConnectionProvider)loadHelper.loadClass(cpClass).newInstance();
                }
                try
                {
                    pp.getUnderlyingProperties().remove("connectionProvider.class");
		    //设置数据源属性
                    setBeanProps(cp, pp.getUnderlyingProperties());
		    //初始化数据源
                    cp.initialize();
                }
                dbMgr = DBConnectionManager.getInstance();
                dbMgr.addConnectionProvider(dsNames[i], cp);
                continue;
            }
	    //配置驱动,url
	    String dsDriver = pp.getStringProperty("driver");
            String dsURL = pp.getStringProperty("URL");
	     try
            {
                PoolingConnectionProvider cp = new PoolingConnectionProvider(pp.getUnderlyingProperties());
                dbMgr = DBConnectionManager.getInstance();
		//添加数据源到数据库连接管理器
                dbMgr.addConnectionProvider(dsNames[i], cp);
                continue;
            }
	 }
	 //获取前缀为prefix的属性
 public String[] getPropertyGroups(String prefix)
    {
        Enumeration keys = props.propertyNames();
        HashSet groups = new HashSet(10);
        if(!prefix.endsWith("."))
            prefix = (new StringBuilder()).append(prefix).append(".").toString();
        do
        {
            if(!keys.hasMoreElements())
                break;
            String key = (String)keys.nextElement();
            if(key.startsWith(prefix))
            {
                String groupName = key.substring(prefix.length(), key.indexOf('.', prefix.length()));
                groups.add(groupName);
            }
        } while(true);
        return (String[])(String[])groups.toArray(new String[groups.size()]);
    }
    private void setBeanProps(Object obj, Properties props)
        throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, IntrospectionException, SchedulerConfigException
    {
        props.remove("class");
        BeanInfo bi = Introspector.getBeanInfo(obj.getClass());
	//获取bean的属性描述
        PropertyDescriptor propDescs[] = bi.getPropertyDescriptors();
        PropertiesParser pp = new PropertiesParser(props);
        for(Enumeration keys = props.keys(); keys.hasMoreElements();)
        {
            String name = (String)keys.nextElement();
            String c = name.substring(0, 1).toUpperCase(Locale.US);
            String methName = (new StringBuilder()).append("set").append(c).append(name.substring(1)).toString();
            //获取方法名为methName的Method
	    Method setMeth = getSetMethod(methName, propDescs);
            try
            {
                if(setMeth == null)
                    throw new NoSuchMethodException((new StringBuilder()).append("No setter for property '").append(name).append("'").toString());
                Class params[] = setMeth.getParameterTypes();
                if(params.length != 1)
                    throw new NoSuchMethodException((new StringBuilder()).append("No 1-argument setter for property '").append(name).append("'").toString());
                PropertiesParser refProps = pp;
                String refName = pp.getStringProperty(name);
                if(refName != null && refName.startsWith("$@"))
                {
                    refName = refName.substring(2);
                    refProps = cfg;
                } else
                {
                    refName = name;
                }
		//根据不同类型设值
                if(params[0].equals(Integer.TYPE))
		    //Method.invoke(Object)
                    setMeth.invoke(obj, new Object[] {
                        Integer.valueOf(refProps.getIntProperty(refName))
                    });
                if(params[0].equals(Long.TYPE))
                    setMeth.invoke(obj, new Object[] {
                        Long.valueOf(refProps.getLongProperty(refName))
                    });
                if(params[0].equals(Float.TYPE))
                    setMeth.invoke(obj, new Object[] {
                        Float.valueOf(refProps.getFloatProperty(refName))
                    });
                if(params[0].equals(Double.TYPE))
                    setMeth.invoke(obj, new Object[] {
                        Double.valueOf(refProps.getDoubleProperty(refName))
                    });
                if(params[0].equals(Boolean.TYPE))
                    setMeth.invoke(obj, new Object[] {
                        Boolean.valueOf(refProps.getBooleanProperty(refName))
                    });
                if(params[0].equals(java/lang/String))
                    setMeth.invoke(obj, new Object[] {
                        refProps.getStringProperty(refName)
                    });
            }
        }
    }
   //获取方法名为name的Method
    private Method getSetMethod(String name, PropertyDescriptor props[])
    {
        for(int i = 0; i < props.length; i++)
        {
            Method wMeth = props[i].getWriteMethod();
            if(wMeth != null && wMeth.getName().equals(name))
                return wMeth;
        }

        return null;
    }


 }

//数据库连接管理器
public class DBConnectionManager{
    //获取DBConnectionManager单例instance
    public static DBConnectionManager getInstance()
    {
        return instance;
    }
    //添加数据源到数据库连接管理器
     public void addConnectionProvider(String dataSourceName, ConnectionProvider provider)
    {
        providers.put(dataSourceName, provider);
    }
    //获取连接
    public Connection getConnection(String dsName)
        throws SQLException
    {
        ConnectionProvider provider = (ConnectionProvider)providers.get(dsName);
        if(provider == null)
            throw new SQLException((new StringBuilder()).append("There is no DataSource named '").append(dsName).append("'").toString());
        else
            return provider.getConnection();
    }
  private static DBConnectionManager instance = new DBConnectionManager();
  private HashMap providers;//HashMap<String,ConnectionProvider>,key为dataSourceName

}

//数据库连接池 PoolingConnectionProvider
public class PoolingConnectionProvider
    implements ConnectionProvider
{
   //根据config构造数据源
public PoolingConnectionProvider(Properties config)
        throws SchedulerException, SQLException
    {
        PropertiesParser cfg = new PropertiesParser(config);
        initialize(cfg.getStringProperty("driver"), cfg.getStringProperty("URL"), cfg.getStringProperty("user", ""), cfg.getStringProperty("password", ""), cfg.getIntProperty("maxConnections", 10), cfg.getIntProperty("maxCachedStatementsPerConnection", 120), cfg.getStringProperty("validationQuery"), cfg.getBooleanProperty("validateOnCheckout", false), cfg.getIntProperty("idleConnectionValidationSeconds", 50), cfg.getIntProperty("discardIdleConnectionsSeconds", 0));
    }
    //初始化数据源
    private void initialize(String dbDriver, String dbURL, String dbUser, String dbPassword, int maxConnections, int maxStatementsPerConnection, String dbValidationQuery, 
            boolean validateOnCheckout, int idleValidationSeconds, int maxIdleSeconds)
        throws SQLException, SchedulerException
    {
        if(dbURL == null)
            throw new SQLException("DBPool could not be created: DB URL cannot be null");
        if(dbDriver == null)
            throw new SQLException((new StringBuilder()).append("DBPool '").append(dbURL).append("' could not be created: ").append("DB driver class name cannot be null!").toString());
        if(maxConnections < 0)
            throw new SQLException((new StringBuilder()).append("DBPool '").append(dbURL).append("' could not be created: ").append("Max connections must be greater than zero!").toString());
        datasource = new ComboPooledDataSource();
        try
        {
            datasource.setDriverClass(dbDriver);
        }
        catch(PropertyVetoException e)
        {
            throw new SchedulerException((new StringBuilder()).append("Problem setting driver class name on datasource: ").append(e.getMessage()).toString(), e);
        }
        datasource.setJdbcUrl(dbURL);
        datasource.setUser(dbUser);
        datasource.setPassword(dbPassword);
        datasource.setMaxPoolSize(maxConnections);
        datasource.setMinPoolSize(1);
        datasource.setMaxIdleTime(maxIdleSeconds);
        datasource.setMaxStatementsPerConnection(maxStatementsPerConnection);
        if(dbValidationQuery != null)
        {
            datasource.setPreferredTestQuery(dbValidationQuery);
            if(!validateOnCheckout)
                datasource.setTestConnectionOnCheckin(true);
            else
                datasource.setTestConnectionOnCheckout(true);
            datasource.setIdleConnectionTestPeriod(idleValidationSeconds);
        }
    }
     public void initialize()
        throws SQLException
    {
    }
    public static final String DB_DRIVER = "driver";
    public static final String DB_URL = "URL";
    public static final String DB_USER = "user";
    public static final String DB_PASSWORD = "password";
    public static final String DB_MAX_CONNECTIONS = "maxConnections";
    public static final String DB_MAX_CACHED_STATEMENTS_PER_CONNECTION = "maxCachedStatementsPerConnection";
    public static final String DB_VALIDATION_QUERY = "validationQuery";
    public static final String DB_IDLE_VALIDATION_SECONDS = "idleConnectionValidationSeconds";
    public static final String DB_VALIDATE_ON_CHECKOUT = "validateOnCheckout";
    private static final String DB_DISCARD_IDLE_CONNECTIONS_SECONDS = "discardIdleConnectionsSeconds";
    public static final int DEFAULT_DB_MAX_CONNECTIONS = 10;
    public static final int DEFAULT_DB_MAX_CACHED_STATEMENTS_PER_CONNECTION = 120;
    private ComboPooledDataSource datasource;//Quartz数据库连接池默认为c3p0
}

//RDB持久化存储器
public class JobStoreTX extends JobStoreSupport
{
    public void initialize(ClassLoadHelper classLoadHelper, SchedulerSignaler schedSignaler)
        throws SchedulerConfigException
    {
        super.initialize(classLoadHelper, schedSignaler);
        getLog().info("JobStoreTX initialized.");
    }

    protected Connection getNonManagedTXConnection()
        throws JobPersistenceException
    {
        return getConnection();
    }
    //加锁执行txCallback,锁名lockName
    protected Object executeInLock(String lockName, JobStoreSupport.TransactionCallback txCallback)
        throws JobPersistenceException
    {
        return executeInNonManagedTXLock(lockName, txCallback, null);
    }
}
public abstract class JobStoreSupport
    implements JobStore, Constants
{
//默认构造
 public JobStoreSupport()
    {
        tablePrefix = "QRTZ_";
        useProperties = false;
        delegateClass = org/quartz/impl/jdbcjobstore/StdJDBCDelegate;
        calendarCache = new HashMap();
        misfireThreshold = 60000L;
        dontSetAutoCommitFalse = false;
        isClustered = false;
        useDBLocks = false;
        lockOnInsert = true;
        lockHandler = null;
        selectWithLockSQL = null;
        clusterCheckinInterval = 7500L;
        clusterManagementThread = null;
        misfireHandler = null;
        maxToRecoverAtATime = 20;
        setTxIsolationLevelSequential = false;
        acquireTriggersWithinLock = false;
        dbRetryInterval = 15000L;
        makeThreadsDaemons = false;
        threadsInheritInitializersClassLoadContext = false;
        initializersLoader = null;
        doubleCheckLockMisfireHandler = true;
        threadExecutor = new DefaultThreadExecutor();
        schedulerRunning = false;
        shutdown = false;
        sigChangeForTxCompletion = new ThreadLocal();
        firstCheckIn = true;
        lastCheckin = System.currentTimeMillis();
    }
    //QuaztSheduler.scheduleJob(JobDetail jobDetail, Trigger trigger)
    //resources.getJobStore().storeJobAndTrigger(jobDetail, trig);
    //存储jobDetail,trriger
    public void storeJobAndTrigger(final JobDetail newJob, final OperableTrigger newTrigger)
        throws JobPersistenceException
    {
        //调用JobStoreTX的executeInLock
        executeInLock(isLockOnInsert() ? "TRIGGER_ACCESS" : null, new VoidTransactionCallback() {

            public void executeVoid(Connection conn)
                throws JobPersistenceException
            {
	        //存储jobDetail
                storeJob(conn, newJob, false);
		//存储,trriger
                storeTrigger(conn, newTrigger, newJob, false, "WAITING", false, false);
            }
            final JobDetail val$newJob;
            final OperableTrigger val$newTrigger;
            final JobStoreSupport this$0;
            {
                this$0 = JobStoreSupport.this;
                newJob = jobdetail;
                newTrigger = operabletrigger;
                super();
            }
        });
    }
   
    //是否要加插入锁,独占锁
       public boolean isLockOnInsert()
    {
        return lockOnInsert;
    }
    protected void storeJob(Connection conn, JobDetail newJob, boolean replaceExisting)
        throws JobPersistenceException
    {
        //检查job是否存在
        boolean existingJob = jobExists(conn, newJob.getKey());
        try
        {
            if(existingJob)
            {
                if(!replaceExisting)
                    throw new ObjectAlreadyExistsException(newJob);
		//存在,则更新job
                getDelegate().updateJobDetail(conn, newJob);
            } else
            {
	        //不存在,则插入job
                getDelegate().insertJobDetail(conn, newJob);
            }
        }
    }
    protected void storeTrigger(Connection conn, OperableTrigger newTrigger, JobDetail job, boolean replaceExisting, String state, boolean forceState, boolean recovering)
        throws JobPersistenceException
    {
        //查询触发器trrgerKey是否存在
        boolean existingTrigger = triggerExists(conn, newTrigger.getKey());
        try
        {
            if(!forceState)
            {
	        //获取触发器组暂停状态
                boolean shouldBepaused = getDelegate().isTriggerGroupPaused(conn, newTrigger.getKey().getGroup());
                if(!shouldBepaused)
                {
                    shouldBepaused = getDelegate().isTriggerGroupPaused(conn, "_$_ALL_GROUPS_PAUSED_$_");
                    if(shouldBepaused)
		        //如果暂定,则加入到触发器暂停表中
                        getDelegate().insertPausedTriggerGroup(conn, newTrigger.getKey().getGroup());
                }
                if(shouldBepaused && (state.equals("WAITING") || state.equals("ACQUIRED")))
                    state = "PAUSED";
            }
            if(job == null)
	        //获取job信息
                job = getDelegate().selectJobDetail(conn, newTrigger.getJobKey(), getClassLoadHelper());
            if(job == null)
                throw new JobPersistenceException((new StringBuilder()).append("The job (").append(newTrigger.getJobKey()).append(") referenced by the trigger does not exist.").toString());
            if(job.isConcurrentExectionDisallowed() && !recovering)
	        //检查job阻塞状态
                state = checkBlockedState(conn, job.getKey(), state);
	    //触发器存在则更新,否插入
            if(existingTrigger)
                getDelegate().updateTrigger(conn, newTrigger, state, job);
            else
                getDelegate().insertTrigger(conn, newTrigger, state, job);
        }
    }
//获取驱动代理
 protected DriverDelegate getDelegate()
        throws NoSuchDelegateException
    {
        JobStoreSupport jobstoresupport = this;
        JVM INSTR monitorenter ;
        if(null == _flddelegate)
            try
            {
                if(delegateClassName != null)
                    delegateClass = getClassLoadHelper().loadClass(delegateClassName, org/quartz/impl/jdbcjobstore/DriverDelegate);
                _flddelegate = (DriverDelegate)delegateClass.newInstance();
		//初始化代理
                _flddelegate.initialize(getLog(), tablePrefix, instanceName, instanceId, getClassLoadHelper(), canUseProperties(), getDriverDelegateInitString());
            }
        return _flddelegate;

    }
    //移除job
     public boolean removeJob(final JobKey jobKey)
        throws JobPersistenceException
    {
        return ((Boolean)executeInLock("TRIGGER_ACCESS", new TransactionCallback() {

            public Object execute(Connection conn)
                throws JobPersistenceException
            {
                return removeJob(conn, jobKey) ? Boolean.TRUE : Boolean.FALSE;
            }

            final JobKey val$jobKey;
            final JobStoreSupport this$0;

            
            {
                this$0 = JobStoreSupport.this;
                jobKey = jobkey;
                super();
            }
        })).booleanValue();
    }
    //移除jobKey
    protected boolean removeJob(Connection conn, JobKey jobKey)
        throws JobPersistenceException
    {
        //获取jobKey所有触发器
        List jobTriggers = getDelegate().selectTriggerKeysForJob(conn, jobKey);
        TriggerKey jobTrigger;
	//删除所有触发器
        for(Iterator i$ = jobTriggers.iterator(); i$.hasNext(); deleteTriggerAndChildren(conn, jobTrigger))
            jobTrigger = (TriggerKey)i$.next();
        //删除所有job
        return deleteJobAndChildren(conn, jobKey);
   }
   //暂定job
   public void pauseJob(final JobKey jobKey)
        throws JobPersistenceException
    {
        executeInLock("TRIGGER_ACCESS", new VoidTransactionCallback() {

            public void executeVoid(Connection conn)
                throws JobPersistenceException
            {
                List triggers = getTriggersForJob(conn, jobKey);
                OperableTrigger trigger;
		//暂定触发器任务
                for(Iterator i$ = triggers.iterator(); i$.hasNext(); pauseTrigger(conn, trigger.getKey()))
                    trigger = (OperableTrigger)i$.next();
            }
        });
    }
    //暂定触发器
    public void pauseTrigger(Connection conn, TriggerKey triggerKey)
        throws JobPersistenceException
    {
        try
        {
            String oldState = getDelegate().selectTriggerState(conn, triggerKey);
            if(oldState.equals("WAITING") || oldState.equals("ACQUIRED"))
	        //如果是等待状态,则更新为暂定
                getDelegate().updateTriggerState(conn, triggerKey, "PAUSED");
            else
            if(oldState.equals("BLOCKED"))
	        //若果触发器为阻塞,则更新状态为暂定阻塞
                getDelegate().updateTriggerState(conn, triggerKey, "PAUSED_BLOCKED");
        }
    }
    //恢复job
     public void resumeJob(final JobKey jobKey)
         throws JobPersistenceException
    {
        executeInLock("TRIGGER_ACCESS", new VoidTransactionCallback() {

            public void executeVoid(Connection conn)
                throws JobPersistenceException
            {
	        //获取jobKey的触发器
                List triggers = getTriggersForJob(conn, jobKey);
                OperableTrigger trigger;
		//恢复所有触发器
                for(Iterator i$ = triggers.iterator(); i$.hasNext(); resumeTrigger(conn, trigger.getKey()))
                    trigger = (OperableTrigger)i$.next();

            }
        });
    }
     public void resumeTrigger(Connection conn, TriggerKey key)
        throws JobPersistenceException
    {
      
        try
        {
	    //获取触发器状态
            status = getDelegate().selectTriggerStatus(conn, key);
            if(status == null || status.getNextFireTime() == null)
                return;
        }
        blocked = false;
        if("PAUSED_BLOCKED".equals(status.getStatus()))
            blocked = true;
	 //检测任务阻塞状态
        newState = checkBlockedState(conn, status.getJobKey(), "WAITING");
        misfired = false;
        if(schedulerRunning && status.getNextFireTime().before(new Date()))
	    //获取触发器,下一次触发的时间,并更新触发任务
            misfired = updateMisfiredTrigger(conn, key, newState, true);
        if(!misfired)
            if(blocked)
	        //如果阻塞,则更新为PAUSED_BLOCKED
                getDelegate().updateTriggerStateFromOtherState(conn, key, newState, "PAUSED_BLOCKED");
            else
	       //如果非阻塞,则更新为PAUSED
                getDelegate().updateTriggerStateFromOtherState(conn, key, newState, "PAUSED");
    }
    //获取就绪触发任务列表
     protected List acquireNextTrigger(Connection conn, long noLaterThan, int maxCount, long timeWindow)
        throws JobPersistenceException
    {
        List acquiredTriggers;
        Set acquiredJobKeysForNoConcurrentExec;
        int currentLoopCount;
        long firstAcquiredTriggerFireTime;
        if(timeWindow < 0L)
            throw new IllegalArgumentException();
        acquiredTriggers = new ArrayList();
        acquiredJobKeysForNoConcurrentExec = new HashSet();
        int MAX_DO_LOOP_RETRY = 3;
        currentLoopCount = 0;
        firstAcquiredTriggerFireTime = 0L;
_L2:
        currentLoopCount++;
        List keys = getDelegate().selectTriggerToAcquire(conn, noLaterThan + timeWindow, getMisfireTime(), maxCount);
label0:
        {
            if(keys == null || keys.size() == 0)
                return acquiredTriggers;
            try
            {
                Iterator i$ = keys.iterator();
                do
                {
                    if(!i$.hasNext())
                        break;
                    TriggerKey triggerKey = (TriggerKey)i$.next();
                    OperableTrigger nextTrigger = retrieveTrigger(conn, triggerKey);
                    JobKey jobKey = nextTrigger.getJobKey();
                    JobDetail job = getDelegate().selectJobDetail(conn, jobKey, getClassLoadHelper());
                    int rowsUpdated = getDelegate().updateTriggerStateFromOtherState(conn, triggerKey, "ACQUIRED", "WAITING");
                    if(rowsUpdated > 0)
                    {
                        //插入触发任务到任务绪表
                        getDelegate().insertFiredTrigger(conn, nextTrigger, "ACQUIRED", null);
			//将nextTrigger添加到就绪集合
                        acquiredTriggers.add(nextTrigger);
                        if(firstAcquiredTriggerFireTime == 0L)
                            firstAcquiredTriggerFireTime = nextTrigger.getNextFireTime().getTime();
                    }
                } while(true);
                if(acquiredTriggers.size() != 0 || currentLoopCount >= 3)
                    break label0;
            }
           
        }
        return acquiredTriggers;
    }
    //处理触发任务完成后的工作
     protected void triggeredJobComplete(Connection conn, OperableTrigger trigger, JobDetail jobDetail, org.quartz.Trigger.CompletedExecutionInstruction triggerInstCode)
        throws JobPersistenceException
    {
        try
        {
            if(triggerInstCode == org.quartz.Trigger.CompletedExecutionInstruction.DELETE_TRIGGER)
            {
                if(trigger.getNextFireTime() == null)
                {
                    TriggerStatus stat = getDelegate().selectTriggerStatus(conn, trigger.getKey());
                    if(stat != null && stat.getNextFireTime() == null)
		        //触发器
                        removeTrigger(conn, trigger.getKey());
                } else
                {
		    //移除触发任务
                    removeTrigger(conn, trigger.getKey());
		    //通知调度器,调度任务完成
                    signalSchedulingChangeOnTxCompletion(0L);
                }
            } else
            if(triggerInstCode == org.quartz.Trigger.CompletedExecutionInstruction.SET_TRIGGER_COMPLETE)
            {
	        //更新触发器为完成状态,并产生触发器完成通知事件
                getDelegate().updateTriggerState(conn, trigger.getKey(), "COMPLETE");
                signalSchedulingChangeOnTxCompletion(0L);
            } else
            if(triggerInstCode == org.quartz.Trigger.CompletedExecutionInstruction.SET_TRIGGER_ERROR)
            {
                getLog().info((new StringBuilder()).append("Trigger ").append(trigger.getKey()).append(" set to ERROR state.").toString());
                //更新触发器为错误状态,并产生触发器执行错误通知事件
		getDelegate().updateTriggerState(conn, trigger.getKey(), "ERROR");
                signalSchedulingChangeOnTxCompletion(0L);
            } else
            if(triggerInstCode == org.quartz.Trigger.CompletedExecutionInstruction.SET_ALL_JOB_TRIGGERS_COMPLETE)
            {
	        //更新job为完成状态,并产生job完成通知事件
                getDelegate().updateTriggerStatesForJob(conn, trigger.getJobKey(), "COMPLETE");
                signalSchedulingChangeOnTxCompletion(0L);
            } else
            if(triggerInstCode == org.quartz.Trigger.CompletedExecutionInstruction.SET_ALL_JOB_TRIGGERS_ERROR)
            {
                getLog().info((new StringBuilder()).append("All triggers of Job ").append(trigger.getKey()).append(" set to ERROR state.").toString());
                //更新job为错误状态,并产生job执行错误通知事件
		getDelegate().updateTriggerStatesForJob(conn, trigger.getJobKey(), "ERROR");
                signalSchedulingChangeOnTxCompletion(0L);
            }
            if(jobDetail.isConcurrentExectionDisallowed())
            {
	        //如果job不允许并发执行,则暂定job
                getDelegate().updateTriggerStatesForJobFromOtherState(conn, jobDetail.getKey(), "WAITING", "BLOCKED");
                getDelegate().updateTriggerStatesForJobFromOtherState(conn, jobDetail.getKey(), "PAUSED", "PAUSED_BLOCKED");
                signalSchedulingChangeOnTxCompletion(0L);
            }
	    //job执行完,更新job数据,持久化
            if(jobDetail.isPersistJobDataAfterExecution())
                try
                {
                    if(jobDetail.getJobDataMap().isDirty())
                        getDelegate().updateJobData(conn, jobDetail);
                }
        }
        try
        {
	    //从触发任务就绪表删除任务
            getDelegate().deleteFiredTrigger(conn, trigger.getFireInstanceId());
        }
    }
//事务执行回调接口
protected abstract class VoidTransactionCallback
        implements TransactionCallback
    {

        public final Void execute(Connection conn)
            throws JobPersistenceException
        {
            executeVoid(conn);
            return null;
        }

        abstract void executeVoid(Connection connection)
            throws JobPersistenceException;

        public volatile Object execute(Connection x0)
            throws JobPersistenceException
        {
            return execute(x0);
        }

        final JobStoreSupport this$0;

        protected VoidTransactionCallback()
        {
            this$0 = JobStoreSupport.this;
            super();
        }
    }
 protected static final String LOCK_TRIGGER_ACCESS = "TRIGGER_ACCESS";
    protected static final String LOCK_STATE_ACCESS = "STATE_ACCESS";
    protected String dsName;
    protected String tablePrefix;
    protected boolean useProperties;
    protected String instanceId;
    protected String instanceName;
    protected String delegateClassName;
    protected String delegateInitString;
    protected Class delegateClass;
    protected HashMap calendarCache;
    private DriverDelegate _flddelegate;
    private long misfireThreshold;
    private boolean dontSetAutoCommitFalse;
    private boolean isClustered;
    private boolean useDBLocks;
    private boolean lockOnInsert;//
    private Semaphore lockHandler;
    private String selectWithLockSQL;
    private long clusterCheckinInterval;
    private ClusterManager clusterManagementThread;
    private MisfireHandler misfireHandler;
    private ClassLoadHelper classLoadHelper;
    private SchedulerSignaler schedSignaler;
    protected int maxToRecoverAtATime;
    private boolean setTxIsolationLevelSequential;
    private boolean acquireTriggersWithinLock;
    private long dbRetryInterval;
    private boolean makeThreadsDaemons;
    private boolean threadsInheritInitializersClassLoadContext;
    private ClassLoader initializersLoader;
    private boolean doubleCheckLockMisfireHandler;
    private final Logger log = LoggerFactory.getLogger(getClass());
    private ThreadExecutor threadExecutor;
    private volatile boolean schedulerRunning;
    private volatile boolean shutdown;
    private static long ftrCtr = System.currentTimeMillis();
    protected ThreadLocal sigChangeForTxCompletion;
    protected boolean firstCheckIn;
    protected long lastCheckin;

}

//jdbc标准代理
public class StdJDBCDelegate
    implements DriverDelegate, StdJDBCConstants
{
//初始化
public void initialize(Logger logger, String tablePrefix, String schedName, String instanceId, ClassLoadHelper classLoadHelper, boolean useProperties, String initString)
        throws NoSuchDelegateException
    {
        this.logger = logger;
        this.tablePrefix = tablePrefix;
        this.schedName = schedName;
        this.instanceId = instanceId;
        this.useProperties = useProperties;
        this.classLoadHelper = classLoadHelper;
	//添加默认触发器代理
        addDefaultTriggerPersistenceDelegates();
        if(initString == null)
            return;
        String settings[] = initString.split("\\|");
        String arr$[] = settings;
        int len$ = arr$.length;
label0:
        for(int i$ = 0; i$ < len$; i$++)
        {
            String setting = arr$[i$];
            String parts[] = setting.split("=");
            String name = parts[0];
            if(parts.length == 1 || parts[1] == null || parts[1].equals(""))
                continue;
            if(name.equals("triggerPersistenceDelegateClasses"))
            {
                String trigDelegates[] = parts[1].split(",");
                String arr$[] = trigDelegates;
                int len$ = arr$.length;
                int i$ = 0;
                do
                {
                    if(i$ >= len$)
                        continue label0;
                    String trigDelClassName = arr$[i$];
                    try
                    {
                        Class trigDelClass = classLoadHelper.loadClass(trigDelClassName);
                        addTriggerPersistenceDelegate((TriggerPersistenceDelegate)trigDelClass.newInstance());
                    }
                    i$++;
                } while(true);
            }
        }

    }
   //添加默认触发器代理
   protected void addDefaultTriggerPersistenceDelegates()
    {
        //简单触发器代理
        addTriggerPersistenceDelegate(new SimpleTriggerPersistenceDelegate());
	//Cron表达式触发器代理
        addTriggerPersistenceDelegate(new CronTriggerPersistenceDelegate());
        addTriggerPersistenceDelegate(new CalendarIntervalTriggerPersistenceDelegate());
        addTriggerPersistenceDelegate(new DailyTimeIntervalTriggerPersistenceDelegate());
    }
    //插入JobDetail
      public int insertJobDetail(Connection conn, JobDetail job)
        throws IOException, SQLException
    {
        ByteArrayOutputStream baos;
        PreparedStatement ps;
        int insertResult;
        baos = serializeJobData(job.getJobDataMap());
        ps = null;
        insertResult = 0;
	//插入job语句
        ps = conn.prepareStatement(rtp("INSERT INTO {0}JOB_DETAILS (SCHED_NAME, JOB_NAME, JOB_GROUP, DESCRIPTION, JOB_CLASS_NAME, IS_DURABLE, IS_NONCONCURRENT, IS_UPDATE_DATA, REQUESTS_RECOVERY, JOB_DATA)  VALUES({1}, ?, ?, ?, ?, ?, ?, ?, ?, ?)"));
        ps.setString(1, job.getKey().getName());
        ps.setString(2, job.getKey().getGroup());
        ps.setString(3, job.getDescription());
        ps.setString(4, job.getJobClass().getName());
        setBoolean(ps, 5, job.isDurable());
        setBoolean(ps, 6, job.isConcurrentExectionDisallowed());
        setBoolean(ps, 7, job.isPersistJobDataAfterExecution());
        setBoolean(ps, 8, job.requestsRecovery());
        setBytes(ps, 9, baos);
        insertResult = ps.executeUpdate();
        closeStatement(ps);
        break MISSING_BLOCK_LABEL_187;
        closeStatement(ps);
        return insertResult;
    }
    //更新job
    public int updateJobDetail(Connection conn, JobDetail job)
        throws IOException, SQLException
    {
    ps = conn.prepareStatement(rtp("UPDATE {0}JOB_DETAILS SET DESCRIPTION = ?, JOB_CLASS_NAME = ?, IS_DURABLE = ?, IS_NONCONCURRENT = ?, IS_UPDATE_DATA = ?, REQUESTS_RECOVERY = ?, JOB_DATA = ?  WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?"));
    }
    //删除job
     public int deleteJobDetail(Connection conn, JobKey jobKey)
        throws SQLException
    {     
        ps = conn.prepareStatement(rtp("DELETE FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?"));
    }

    protected String tablePrefix;//表前缀
    protected String instanceId;
    protected String schedName;
    protected boolean useProperties;
    protected ClassLoadHelper classLoadHelper;
    protected List triggerPersistenceDelegates;
    private String schedNameLiteral;
}

//Cron表达式触发器持久化类
public class CronTriggerPersistenceDelegate
    implements TriggerPersistenceDelegate, StdJDBCConstants
{
   //初始化表前缀和数据库schedName
 public void initialize(String theTablePrefix, String schedName)
    {
        tablePrefix = theTablePrefix;
        schedNameLiteral = (new StringBuilder()).append("'").append(schedName).append("'").toString();
    }
    //删除触发器
     public int deleteExtendedTriggerProperties(Connection conn, TriggerKey triggerKey)
        throws SQLException
    {
        PreparedStatement ps = null;
        int i;
	//删除语句
        ps = conn.prepareStatement(Util.rtp("DELETE FROM {0}CRON_TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?", tablePrefix, schedNameLiteral));
        ps.setString(1, triggerKey.getName());
        ps.setString(2, triggerKey.getGroup());
        i = ps.executeUpdate();
        Util.closeStatement(ps);
        return i;
        Util.closeStatement(ps);

    }
    //插入触发器
    public int insertExtendedTriggerProperties(Connection conn, OperableTrigger trigger, String state, JobDetail jobDetail)
        throws SQLException, IOException
    {
        CronTrigger cronTrigger;
        PreparedStatement ps;
        cronTrigger = (CronTrigger)trigger;
        ps = null;
        int i;
        ps = conn.prepareStatement(Util.rtp("INSERT INTO {0}CRON_TRIGGERS (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP, CRON_EXPRESSION, TIME_ZONE_ID)  VALUES({1}, ?, ?, ?, ?)", tablePrefix, schedNameLiteral));
        ps.setString(1, trigger.getKey().getName());
        ps.setString(2, trigger.getKey().getGroup());
        ps.setString(3, cronTrigger.getCronExpression());
        ps.setString(4, cronTrigger.getTimeZone().getID());
        i = ps.executeUpdate();
        Util.closeStatement(ps);
        return i;
        Util.closeStatement(ps);
    }

//更新触发器
    public int updateExtendedTriggerProperties(Connection conn, OperableTrigger trigger, String state, JobDetail jobDetail)
        throws SQLException, IOException
    {
        CronTrigger cronTrigger;
        PreparedStatement ps;
        cronTrigger = (CronTrigger)trigger;
        ps = null;
        int i;
	//更新语句
        ps = conn.prepareStatement(Util.rtp("UPDATE {0}CRON_TRIGGERS SET CRON_EXPRESSION = ?, TIME_ZONE_ID = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?", tablePrefix, schedNameLiteral));
        ps.setString(1, cronTrigger.getCronExpression());
        ps.setString(2, cronTrigger.getTimeZone().getID());
        ps.setString(3, trigger.getKey().getName());
        ps.setString(4, trigger.getKey().getGroup());
        i = ps.executeUpdate();
        Util.closeStatement(ps);
        return i;
    }

    protected String tablePrefix;
    protected String schedNameLiteral;
}

//操作相关表的语句常量
public interface StdJDBCConstants
    extends Constants
{
    public static final String TABLE_PREFIX_SUBST = "{0}";
    public static final String SCHED_NAME_SUBST = "{1}";
    public static final String UPDATE_TRIGGER_STATES_FROM_OTHER_STATES = "UPDATE {0}TRIGGERS SET TRIGGER_STATE = ? WHERE SCHED_NAME = {1} AND (TRIGGER_STATE = ? OR TRIGGER_STATE = ?)";
    public static final String SELECT_MISFIRED_TRIGGERS = "SELECT * FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND NOT (MISFIRE_INSTR = -1) AND NEXT_FIRE_TIME < ? ORDER BY NEXT_FIRE_TIME ASC, PRIORITY DESC";
    public static final String SELECT_TRIGGERS_IN_STATE = "SELECT TRIGGER_NAME, TRIGGER_GROUP FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_STATE = ?";
    public static final String SELECT_MISFIRED_TRIGGERS_IN_STATE = "SELECT TRIGGER_NAME, TRIGGER_GROUP FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND NOT (MISFIRE_INSTR = -1) AND NEXT_FIRE_TIME < ? AND TRIGGER_STATE = ? ORDER BY NEXT_FIRE_TIME ASC, PRIORITY DESC";
    public static final String COUNT_MISFIRED_TRIGGERS_IN_STATE = "SELECT COUNT(TRIGGER_NAME) FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND NOT (MISFIRE_INSTR = -1) AND NEXT_FIRE_TIME < ? AND TRIGGER_STATE = ?";
    public static final String SELECT_HAS_MISFIRED_TRIGGERS_IN_STATE = "SELECT TRIGGER_NAME, TRIGGER_GROUP FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND NOT (MISFIRE_INSTR = -1) AND NEXT_FIRE_TIME < ? AND TRIGGER_STATE = ? ORDER BY NEXT_FIRE_TIME ASC, PRIORITY DESC";
    public static final String SELECT_MISFIRED_TRIGGERS_IN_GROUP_IN_STATE = "SELECT TRIGGER_NAME FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND NOT (MISFIRE_INSTR = -1) AND NEXT_FIRE_TIME < ? AND TRIGGER_GROUP = ? AND TRIGGER_STATE = ? ORDER BY NEXT_FIRE_TIME ASC, PRIORITY DESC";
    public static final String DELETE_FIRED_TRIGGERS = "DELETE FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1}";
    public static final String INSERT_JOB_DETAIL = "INSERT INTO {0}JOB_DETAILS (SCHED_NAME, JOB_NAME, JOB_GROUP, DESCRIPTION, JOB_CLASS_NAME, IS_DURABLE, IS_NONCONCURRENT, IS_UPDATE_DATA, REQUESTS_RECOVERY, JOB_DATA)  VALUES({1}, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
    public static final String UPDATE_JOB_DETAIL = "UPDATE {0}JOB_DETAILS SET DESCRIPTION = ?, JOB_CLASS_NAME = ?, IS_DURABLE = ?, IS_NONCONCURRENT = ?, IS_UPDATE_DATA = ?, REQUESTS_RECOVERY = ?, JOB_DATA = ?  WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String SELECT_TRIGGERS_FOR_JOB = "SELECT TRIGGER_NAME, TRIGGER_GROUP FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String SELECT_TRIGGERS_FOR_CALENDAR = "SELECT TRIGGER_NAME, TRIGGER_GROUP FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND CALENDAR_NAME = ?";
    public static final String DELETE_JOB_DETAIL = "DELETE FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String SELECT_JOB_NONCONCURRENT = "SELECT IS_NONCONCURRENT FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String SELECT_JOB_EXISTENCE = "SELECT JOB_NAME FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String UPDATE_JOB_DATA = "UPDATE {0}JOB_DETAILS SET JOB_DATA = ?  WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String SELECT_JOB_DETAIL = "SELECT * FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String SELECT_NUM_JOBS = "SELECT COUNT(JOB_NAME)  FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1}";
    public static final String SELECT_JOB_GROUPS = "SELECT DISTINCT(JOB_GROUP) FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1}";
    public static final String SELECT_JOBS_IN_GROUP_LIKE = "SELECT JOB_NAME, JOB_GROUP FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1} AND JOB_GROUP LIKE ?";
    public static final String SELECT_JOBS_IN_GROUP = "SELECT JOB_NAME, JOB_GROUP FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1} AND JOB_GROUP = ?";
    public static final String INSERT_TRIGGER = "INSERT INTO {0}TRIGGERS (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP, JOB_NAME, JOB_GROUP, DESCRIPTION, NEXT_FIRE_TIME, PREV_FIRE_TIME, TRIGGER_STATE, TRIGGER_TYPE, START_TIME, END_TIME, CALENDAR_NAME, MISFIRE_INSTR, JOB_DATA, PRIORITY)  VALUES({1}, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
    public static final String INSERT_SIMPLE_TRIGGER = "INSERT INTO {0}SIMPLE_TRIGGERS (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP, REPEAT_COUNT, REPEAT_INTERVAL, TIMES_TRIGGERED)  VALUES({1}, ?, ?, ?, ?, ?)";
    public static final String INSERT_CRON_TRIGGER = "INSERT INTO {0}CRON_TRIGGERS (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP, CRON_EXPRESSION, TIME_ZONE_ID)  VALUES({1}, ?, ?, ?, ?)";
    public static final String INSERT_BLOB_TRIGGER = "INSERT INTO {0}BLOB_TRIGGERS (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP, BLOB_DATA)  VALUES({1}, ?, ?, ?)";
    public static final String UPDATE_TRIGGER_SKIP_DATA = "UPDATE {0}TRIGGERS SET JOB_NAME = ?, JOB_GROUP = ?, DESCRIPTION = ?, NEXT_FIRE_TIME = ?, PREV_FIRE_TIME = ?, TRIGGER_STATE = ?, TRIGGER_TYPE = ?, START_TIME = ?, END_TIME = ?, CALENDAR_NAME = ?, MISFIRE_INSTR = ?, PRIORITY = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String UPDATE_TRIGGER = "UPDATE {0}TRIGGERS SET JOB_NAME = ?, JOB_GROUP = ?, DESCRIPTION = ?, NEXT_FIRE_TIME = ?, PREV_FIRE_TIME = ?, TRIGGER_STATE = ?, TRIGGER_TYPE = ?, START_TIME = ?, END_TIME = ?, CALENDAR_NAME = ?, MISFIRE_INSTR = ?, PRIORITY = ?, JOB_DATA = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String UPDATE_SIMPLE_TRIGGER = "UPDATE {0}SIMPLE_TRIGGERS SET REPEAT_COUNT = ?, REPEAT_INTERVAL = ?, TIMES_TRIGGERED = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String UPDATE_CRON_TRIGGER = "UPDATE {0}CRON_TRIGGERS SET CRON_EXPRESSION = ?, TIME_ZONE_ID = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String UPDATE_BLOB_TRIGGER = "UPDATE {0}BLOB_TRIGGERS SET BLOB_DATA = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String SELECT_TRIGGER_EXISTENCE = "SELECT TRIGGER_NAME FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String UPDATE_TRIGGER_STATE = "UPDATE {0}TRIGGERS SET TRIGGER_STATE = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String UPDATE_TRIGGER_STATE_FROM_STATE = "UPDATE {0}TRIGGERS SET TRIGGER_STATE = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ? AND TRIGGER_STATE = ?";
    public static final String UPDATE_TRIGGER_GROUP_STATE_FROM_STATE = "UPDATE {0}TRIGGERS SET TRIGGER_STATE = ? WHERE SCHED_NAME = {1} AND TRIGGER_GROUP LIKE ? AND TRIGGER_STATE = ?";
    public static final String UPDATE_TRIGGER_STATE_FROM_STATES = "UPDATE {0}TRIGGERS SET TRIGGER_STATE = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ? AND (TRIGGER_STATE = ? OR TRIGGER_STATE = ? OR TRIGGER_STATE = ?)";
    public static final String UPDATE_TRIGGER_GROUP_STATE_FROM_STATES = "UPDATE {0}TRIGGERS SET TRIGGER_STATE = ? WHERE SCHED_NAME = {1} AND TRIGGER_GROUP LIKE ? AND (TRIGGER_STATE = ? OR TRIGGER_STATE = ? OR TRIGGER_STATE = ?)";
    public static final String UPDATE_JOB_TRIGGER_STATES = "UPDATE {0}TRIGGERS SET TRIGGER_STATE = ? WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String UPDATE_JOB_TRIGGER_STATES_FROM_OTHER_STATE = "UPDATE {0}TRIGGERS SET TRIGGER_STATE = ? WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ? AND TRIGGER_STATE = ?";
    public static final String DELETE_SIMPLE_TRIGGER = "DELETE FROM {0}SIMPLE_TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String DELETE_CRON_TRIGGER = "DELETE FROM {0}CRON_TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String DELETE_BLOB_TRIGGER = "DELETE FROM {0}BLOB_TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String DELETE_TRIGGER = "DELETE FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String SELECT_NUM_TRIGGERS_FOR_JOB = "SELECT COUNT(TRIGGER_NAME) FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String SELECT_JOB_FOR_TRIGGER = "SELECT J.JOB_NAME, J.JOB_GROUP, J.IS_DURABLE, J.JOB_CLASS_NAME, J.REQUESTS_RECOVERY FROM {0}TRIGGERS T, {0}JOB_DETAILS J WHERE T.SCHED_NAME = {1} AND J.SCHED_NAME = {1} AND T.TRIGGER_NAME = ? AND T.TRIGGER_GROUP = ? AND T.JOB_NAME = J.JOB_NAME AND T.JOB_GROUP = J.JOB_GROUP";
    public static final String SELECT_TRIGGER = "SELECT * FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String SELECT_TRIGGER_DATA = "SELECT JOB_DATA FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String SELECT_TRIGGER_STATE = "SELECT TRIGGER_STATE FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String SELECT_TRIGGER_STATUS = "SELECT TRIGGER_STATE, NEXT_FIRE_TIME, JOB_NAME, JOB_GROUP FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String SELECT_SIMPLE_TRIGGER = "SELECT * FROM {0}SIMPLE_TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String SELECT_CRON_TRIGGER = "SELECT * FROM {0}CRON_TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String SELECT_BLOB_TRIGGER = "SELECT * FROM {0}BLOB_TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String SELECT_NUM_TRIGGERS = "SELECT COUNT(TRIGGER_NAME)  FROM {0}TRIGGERS WHERE SCHED_NAME = {1}";
    public static final String SELECT_NUM_TRIGGERS_IN_GROUP = "SELECT COUNT(TRIGGER_NAME)  FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_GROUP = ?";
    public static final String SELECT_TRIGGER_GROUPS = "SELECT DISTINCT(TRIGGER_GROUP) FROM {0}TRIGGERS WHERE SCHED_NAME = {1}";
    public static final String SELECT_TRIGGER_GROUPS_FILTERED = "SELECT DISTINCT(TRIGGER_GROUP) FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_GROUP LIKE ?";
    public static final String SELECT_TRIGGERS_IN_GROUP_LIKE = "SELECT TRIGGER_NAME, TRIGGER_GROUP FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_GROUP LIKE ?";
    public static final String SELECT_TRIGGERS_IN_GROUP = "SELECT TRIGGER_NAME, TRIGGER_GROUP FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_GROUP = ?";
    public static final String INSERT_CALENDAR = "INSERT INTO {0}CALENDARS (SCHED_NAME, CALENDAR_NAME, CALENDAR)  VALUES({1}, ?, ?)";
    public static final String UPDATE_CALENDAR = "UPDATE {0}CALENDARS SET CALENDAR = ?  WHERE SCHED_NAME = {1} AND CALENDAR_NAME = ?";
    public static final String SELECT_CALENDAR_EXISTENCE = "SELECT CALENDAR_NAME FROM {0}CALENDARS WHERE SCHED_NAME = {1} AND CALENDAR_NAME = ?";
    public static final String SELECT_CALENDAR = "SELECT * FROM {0}CALENDARS WHERE SCHED_NAME = {1} AND CALENDAR_NAME = ?";
    public static final String SELECT_REFERENCED_CALENDAR = "SELECT CALENDAR_NAME FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND CALENDAR_NAME = ?";
    public static final String DELETE_CALENDAR = "DELETE FROM {0}CALENDARS WHERE SCHED_NAME = {1} AND CALENDAR_NAME = ?";
    public static final String SELECT_NUM_CALENDARS = "SELECT COUNT(CALENDAR_NAME)  FROM {0}CALENDARS WHERE SCHED_NAME = {1}";
    public static final String SELECT_CALENDARS = "SELECT CALENDAR_NAME FROM {0}CALENDARS WHERE SCHED_NAME = {1}";
    public static final String SELECT_NEXT_FIRE_TIME = "SELECT MIN(NEXT_FIRE_TIME) AS ALIAS_NXT_FR_TM FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_STATE = ? AND NEXT_FIRE_TIME >= 0";
    public static final String SELECT_TRIGGER_FOR_FIRE_TIME = "SELECT TRIGGER_NAME, TRIGGER_GROUP FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_STATE = ? AND NEXT_FIRE_TIME = ?";
    public static final String SELECT_NEXT_TRIGGER_TO_ACQUIRE = "SELECT TRIGGER_NAME, TRIGGER_GROUP, NEXT_FIRE_TIME, PRIORITY FROM {0}TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_STATE = ? AND NEXT_FIRE_TIME <= ? AND (MISFIRE_INSTR = -1 OR (MISFIRE_INSTR != -1 AND NEXT_FIRE_TIME >= ?)) ORDER BY NEXT_FIRE_TIME ASC, PRIORITY DESC";
    public static final String INSERT_FIRED_TRIGGER = "INSERT INTO {0}FIRED_TRIGGERS (SCHED_NAME, ENTRY_ID, TRIGGER_NAME, TRIGGER_GROUP, INSTANCE_NAME, FIRED_TIME, SCHED_TIME, STATE, JOB_NAME, JOB_GROUP, IS_NONCONCURRENT, REQUESTS_RECOVERY, PRIORITY) VALUES({1}, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
    public static final String UPDATE_FIRED_TRIGGER = "UPDATE {0}FIRED_TRIGGERS SET INSTANCE_NAME = ?, FIRED_TIME = ?, SCHED_TIME = ?, STATE = ?, JOB_NAME = ?, JOB_GROUP = ?, IS_NONCONCURRENT = ?, REQUESTS_RECOVERY = ? WHERE SCHED_NAME = {1} AND ENTRY_ID = ?";
    public static final String SELECT_INSTANCES_FIRED_TRIGGERS = "SELECT * FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND INSTANCE_NAME = ?";
    public static final String SELECT_INSTANCES_RECOVERABLE_FIRED_TRIGGERS = "SELECT * FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND INSTANCE_NAME = ? AND REQUESTS_RECOVERY = ?";
    public static final String SELECT_JOB_EXECUTION_COUNT = "SELECT COUNT(TRIGGER_NAME) FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String SELECT_FIRED_TRIGGERS = "SELECT * FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1}";
    public static final String SELECT_FIRED_TRIGGER = "SELECT * FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?";
    public static final String SELECT_FIRED_TRIGGER_GROUP = "SELECT * FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND TRIGGER_GROUP = ?";
    public static final String SELECT_FIRED_TRIGGERS_OF_JOB = "SELECT * FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?";
    public static final String SELECT_FIRED_TRIGGERS_OF_JOB_GROUP = "SELECT * FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND JOB_GROUP = ?";
    public static final String DELETE_FIRED_TRIGGER = "DELETE FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND ENTRY_ID = ?";
    public static final String DELETE_INSTANCES_FIRED_TRIGGERS = "DELETE FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND INSTANCE_NAME = ?";
    public static final String DELETE_NO_RECOVERY_FIRED_TRIGGERS = "DELETE FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND INSTANCE_NAME = ?REQUESTS_RECOVERY = ?";
    public static final String DELETE_ALL_SIMPLE_TRIGGERS = "DELETE FROM {0}SIMPLE_TRIGGERS  WHERE SCHED_NAME = {1}";
    public static final String DELETE_ALL_SIMPROP_TRIGGERS = "DELETE FROM {0}SIMPROP_TRIGGERS  WHERE SCHED_NAME = {1}";
    public static final String DELETE_ALL_CRON_TRIGGERS = "DELETE FROM {0}CRON_TRIGGERS WHERE SCHED_NAME = {1}";
    public static final String DELETE_ALL_BLOB_TRIGGERS = "DELETE FROM {0}BLOB_TRIGGERS WHERE SCHED_NAME = {1}";
    public static final String DELETE_ALL_TRIGGERS = "DELETE FROM {0}TRIGGERS WHERE SCHED_NAME = {1}";
    public static final String DELETE_ALL_JOB_DETAILS = "DELETE FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1}";
    public static final String DELETE_ALL_CALENDARS = "DELETE FROM {0}CALENDARS WHERE SCHED_NAME = {1}";
    public static final String DELETE_ALL_PAUSED_TRIGGER_GRPS = "DELETE FROM {0}PAUSED_TRIGGER_GRPS WHERE SCHED_NAME = {1}";
    public static final String SELECT_FIRED_TRIGGER_INSTANCE_NAMES = "SELECT DISTINCT INSTANCE_NAME FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1}";
    public static final String INSERT_SCHEDULER_STATE = "INSERT INTO {0}SCHEDULER_STATE (SCHED_NAME, INSTANCE_NAME, LAST_CHECKIN_TIME, CHECKIN_INTERVAL) VALUES({1}, ?, ?, ?)";
    public static final String SELECT_SCHEDULER_STATE = "SELECT * FROM {0}SCHEDULER_STATE WHERE SCHED_NAME = {1} AND INSTANCE_NAME = ?";
    public static final String SELECT_SCHEDULER_STATES = "SELECT * FROM {0}SCHEDULER_STATE WHERE SCHED_NAME = {1}";
    public static final String DELETE_SCHEDULER_STATE = "DELETE FROM {0}SCHEDULER_STATE WHERE SCHED_NAME = {1} AND INSTANCE_NAME = ?";
    public static final String UPDATE_SCHEDULER_STATE = "UPDATE {0}SCHEDULER_STATE SET LAST_CHECKIN_TIME = ? WHERE SCHED_NAME = {1} AND INSTANCE_NAME = ?";
    public static final String INSERT_PAUSED_TRIGGER_GROUP = "INSERT INTO {0}PAUSED_TRIGGER_GRPS (SCHED_NAME, TRIGGER_GROUP) VALUES({1}, ?)";
    public static final String SELECT_PAUSED_TRIGGER_GROUP = "SELECT TRIGGER_GROUP FROM {0}PAUSED_TRIGGER_GRPS WHERE SCHED_NAME = {1} AND TRIGGER_GROUP = ?";
    public static final String SELECT_PAUSED_TRIGGER_GROUPS = "SELECT TRIGGER_GROUP FROM {0}PAUSED_TRIGGER_GRPS WHERE SCHED_NAME = {1}";
    public static final String DELETE_PAUSED_TRIGGER_GROUP = "DELETE FROM {0}PAUSED_TRIGGER_GRPS WHERE SCHED_NAME = {1} AND TRIGGER_GROUP LIKE ?";
    public static final String DELETE_PAUSED_TRIGGER_GROUPS = "DELETE FROM {0}PAUSED_TRIGGER_GRPS WHERE SCHED_NAME = {1}";
}

//数据库表明,及字段名常量
public interface Constants
{
    public static final String TABLE_JOB_DETAILS = "JOB_DETAILS";
    public static final String TABLE_TRIGGERS = "TRIGGERS";
    public static final String TABLE_SIMPLE_TRIGGERS = "SIMPLE_TRIGGERS";
    public static final String TABLE_CRON_TRIGGERS = "CRON_TRIGGERS";
    public static final String TABLE_BLOB_TRIGGERS = "BLOB_TRIGGERS";
    public static final String TABLE_FIRED_TRIGGERS = "FIRED_TRIGGERS";
    public static final String TABLE_CALENDARS = "CALENDARS";
    public static final String TABLE_PAUSED_TRIGGERS = "PAUSED_TRIGGER_GRPS";
    public static final String TABLE_LOCKS = "LOCKS";
    public static final String TABLE_SCHEDULER_STATE = "SCHEDULER_STATE";
    public static final String COL_SCHEDULER_NAME = "SCHED_NAME";
    public static final String COL_JOB_NAME = "JOB_NAME";
    public static final String COL_JOB_GROUP = "JOB_GROUP";
    public static final String COL_IS_DURABLE = "IS_DURABLE";
    public static final String COL_IS_VOLATILE = "IS_VOLATILE";
    public static final String COL_IS_NONCONCURRENT = "IS_NONCONCURRENT";
    public static final String COL_IS_UPDATE_DATA = "IS_UPDATE_DATA";
    public static final String COL_REQUESTS_RECOVERY = "REQUESTS_RECOVERY";
    public static final String COL_JOB_DATAMAP = "JOB_DATA";
    public static final String COL_JOB_CLASS = "JOB_CLASS_NAME";
    public static final String COL_DESCRIPTION = "DESCRIPTION";
    public static final String COL_TRIGGER_NAME = "TRIGGER_NAME";
    public static final String COL_TRIGGER_GROUP = "TRIGGER_GROUP";
    public static final String COL_NEXT_FIRE_TIME = "NEXT_FIRE_TIME";
    public static final String COL_PREV_FIRE_TIME = "PREV_FIRE_TIME";
    public static final String COL_TRIGGER_STATE = "TRIGGER_STATE";
    public static final String COL_TRIGGER_TYPE = "TRIGGER_TYPE";
    public static final String COL_START_TIME = "START_TIME";
    public static final String COL_END_TIME = "END_TIME";
    public static final String COL_PRIORITY = "PRIORITY";
    public static final String COL_MISFIRE_INSTRUCTION = "MISFIRE_INSTR";
    public static final String ALIAS_COL_NEXT_FIRE_TIME = "ALIAS_NXT_FR_TM";
    public static final String COL_REPEAT_COUNT = "REPEAT_COUNT";
    public static final String COL_REPEAT_INTERVAL = "REPEAT_INTERVAL";
    public static final String COL_TIMES_TRIGGERED = "TIMES_TRIGGERED";
    public static final String COL_CRON_EXPRESSION = "CRON_EXPRESSION";
    public static final String COL_BLOB = "BLOB_DATA";
    public static final String COL_TIME_ZONE_ID = "TIME_ZONE_ID";
    public static final String COL_INSTANCE_NAME = "INSTANCE_NAME";
    public static final String COL_FIRED_TIME = "FIRED_TIME";
    public static final String COL_SCHED_TIME = "SCHED_TIME";
    public static final String COL_ENTRY_ID = "ENTRY_ID";
    public static final String COL_ENTRY_STATE = "STATE";
    public static final String COL_CALENDAR_NAME = "CALENDAR_NAME";
    public static final String COL_CALENDAR = "CALENDAR";
    public static final String COL_LOCK_NAME = "LOCK_NAME";
    public static final String COL_LAST_CHECKIN_TIME = "LAST_CHECKIN_TIME";
    public static final String COL_CHECKIN_INTERVAL = "CHECKIN_INTERVAL";
    public static final String DEFAULT_TABLE_PREFIX = "QRTZ_";
    public static final String STATE_WAITING = "WAITING";
    public static final String STATE_ACQUIRED = "ACQUIRED";
    public static final String STATE_EXECUTING = "EXECUTING";
    public static final String STATE_COMPLETE = "COMPLETE";
    public static final String STATE_BLOCKED = "BLOCKED";
    public static final String STATE_ERROR = "ERROR";
    public static final String STATE_PAUSED = "PAUSED";
    public static final String STATE_PAUSED_BLOCKED = "PAUSED_BLOCKED";
    public static final String STATE_DELETED = "DELETED";
    /**
     * @deprecated Field STATE_MISFIRED is deprecated
     */
    public static final String STATE_MISFIRED = "MISFIRED";
    public static final String ALL_GROUPS_PAUSED = "_$_ALL_GROUPS_PAUSED_$_";
    public static final String TTYPE_SIMPLE = "SIMPLE";
    public static final String TTYPE_CRON = "CRON";
    public static final String TTYPE_CAL_INT = "CAL_INT";
    public static final String TTYPE_DAILY_TIME_INT = "DAILY_I";
    public static final String TTYPE_BLOB = "BLOB";
}

总结:
RDB持久化实际上就是将触发器,任务存储在数据中的触发器表和任务表中;
暂停,恢复任务是通过暂定和恢复与jobKey相关的触发器,即修改触发器表中Trriger的状态;
调度任务时,从触发任务表中获取触发任务出发时间小于当前时间的触发任务,加入到触发任务就绪表中,
当触发任务执行完成时,从触发任务就绪表中删除完成的触发任务,然后,查看触发任务的触发器下一触发时间,
如果触发器下一刻触发时间为null,则从触发任务表中删除触发任务,否则,更新触发任务触发时间,从触发任务表,
删除旧触发任务,添加新的触发任务到触发任务表;一个时间窗口过后,重新执行以上调度步骤。
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