public class ReferenceBean<T> extends ReferenceConfig<T> implements FactoryBean, ApplicationContextAware, InitializingBean, DisposableBean
afterPropertiesSet(),初始化consumer、application、module、registry、monitor信息,接下来
Boolean b = isInit(); if (b == null && getConsumer() != null) { b = getConsumer().isInit(); } if (b != null && b.booleanValue()) { getObject(); }
会调到父类referenceConfig的get方法,get方法调用init方法,以下是init片段
1、对本地reslove文件的解析,如果在resolve文件里能找到key为interfaceName的,url设置成key对应的value
if (resolve == null || resolve.length() == 0) { resolveFile = System.getProperty("dubbo.resolve.file"); if (resolveFile == null || resolveFile.length() == 0) { File userResolveFile = new File(new File(System.getProperty("user.home")), "dubbo-resolve.properties"); if (userResolveFile.exists()) { resolveFile = userResolveFile.getAbsolutePath(); } } if (resolveFile != null && resolveFile.length() > 0) { Properties properties = new Properties(); FileInputStream fis = null; try { fis = new FileInputStream(new File(resolveFile)); properties.load(fis); } catch (IOException e) { throw new IllegalStateException("Unload " + resolveFile + ", cause: " + e.getMessage(), e); } finally { try { if (null != fis) fis.close(); } catch (IOException e) { logger.warn(e.getMessage(), e); } } resolve = properties.getProperty(interfaceName); } } if (resolve != null && resolve.length() > 0) { url = resolve; if (logger.isWarnEnabled()) { if (resolveFile != null && resolveFile.length() > 0) { logger.warn("Using default dubbo resolve file " + resolveFile + " replace " + interfaceName + "" + resolve + " to p2p invoke remote service."); } else { logger.warn("Using -D" + interfaceName + "=" + resolve + " to p2p invoke remote service."); } } }
2、载入dubbo.application配置,载入dubbo.service.shutdown.wait 优雅关机 配置
checkApplication()
3、如果reference的stub=true,判断是否有interface为参数的构造函数
if (ConfigUtils.isNotEmpty(stub)) { Class<?> localClass = ConfigUtils.isDefault(stub) ? ReflectUtils.forName(interfaceClass.getName() + "Stub") : ReflectUtils.forName(stub); if (!interfaceClass.isAssignableFrom(localClass)) { throw new IllegalStateException("The local implementation class " + localClass.getName() + " not implement interface " + interfaceClass.getName()); } try { ReflectUtils.findConstructor(localClass, interfaceClass); } catch (NoSuchMethodException e) { throw new IllegalStateException("No such constructor \"public " + localClass.getSimpleName() + "(" + interfaceClass.getName() + ")\" in local implementation class " + localClass.getName()); } }
4、如果reference的mock=true或者mock=mock类名称
if (ConfigUtils.isNotEmpty(mock)) { if (mock.startsWith(Constants.RETURN_PREFIX)) { String value = mock.substring(Constants.RETURN_PREFIX.length()); try { MockInvoker.parseMockValue(value);//如果mock配置是 return xxx } catch (Exception e) { throw new IllegalStateException("Illegal mock json value in <dubbo:service ... mock=\"" + mock + "\" />"); } } else { Class<?> mockClass = ConfigUtils.isDefault(mock) ? ReflectUtils.forName(interfaceClass.getName() + "Mock") : ReflectUtils.forName(mock);//Mock类在mock=true时是interfaceName+Mock(package一致),mock也可以填具体的实现类名称 if (!interfaceClass.isAssignableFrom(mockClass)) {//mockclass要实现interfaceClass throw new IllegalStateException("The mock implementation class " + mockClass.getName() + " not implement interface " + interfaceClass.getName()); } try { mockClass.getConstructor(new Class<?>[0]);//Mock类需要有无参数构造函数 } catch (NoSuchMethodException e) { throw new IllegalStateException("No such empty constructor \"public " + mockClass.getSimpleName() + "()\" in mock implementation class " + mockClass.getName()); } } }
MockInvoker.parseMockValue(value);如下,可见mock:return xxx可以有null 、空对象、true、false、字符串、json串(map、list)
public static Object parseMockValue(String mock, Type[] returnTypes) throws Exception { Object value = null; if ("empty".equals(mock)) { value = ReflectUtils.getEmptyObject(returnTypes != null && returnTypes.length > 0 ? (Class<?>) returnTypes[0] : null); } else if ("null".equals(mock)) { value = null; } else if ("true".equals(mock)) { value = true; } else if ("false".equals(mock)) { value = false; } else if (mock.length() >= 2 && (mock.startsWith("\"") && mock.endsWith("\"") || mock.startsWith("\'") && mock.endsWith("\'"))) { value = mock.subSequence(1, mock.length() - 1); } else if (returnTypes != null && returnTypes.length > 0 && returnTypes[0] == String.class) { value = mock; } else if (StringUtils.isNumeric(mock)) { value = JSON.parse(mock); } else if (mock.startsWith("{")) { value = JSON.parseObject(mock, Map.class); } else if (mock.startsWith("[")) { value = JSON.parseObject(mock, List.class); } else { value = mock; } if (returnTypes != null && returnTypes.length > 0) { value = PojoUtils.realize(value, (Class<?>) returnTypes[0], returnTypes.length > 1 ? returnTypes[1] : null); } return value; }
5、接下来是把组装消费者url所需要的参数放到一个map
6、重头戏来了,创建动态代理
ref = createProxy(map);
url要么是reference指定的(点对点直连),要么是通过注册中心的配置组装的 组装主要是加上applicaiton、protocol相关信息,还要判断subscribe是否为dubbo.registry.subscribe是否为true,如果为rue则不返回url invoker = refprotocol.refer(interfaceClass, url); 生成invoker,refprotocol对应不同的协议,dubbo协议实现类是DubboProtocol,以后再来看这个 // 创建服务代理 return (T) proxyFactory.getProxy(invoker); proxyFactory默认adaptive是javassist
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