1. 启动与Spring实例化
com.xxl.job.core.executor.impl.XxlJobSpringExecutor.java类
继承SmartInitializingSingleton 类，在afterSingletonsInstantiated 实例化后方法中
调用initJobHandlerMethodRepository 把所有的xxljob任务管理起来；
private void initJobHandlerMethodRepository(ApplicationContext applicationContext) {
if (applicationContext == null) {
return;
}
// init job handler from method
//扫描所有的bean，并获取XxlJob的注解，registJobHandler加入到 一个 map 中
// 见jobHandlerRepository
String[] beanDefinitionNames = applicationContext.getBeanNamesForType(Object.class, false, true);
for (String beanDefinitionName : beanDefinitionNames) {
Object bean = applicationContext.getBean(beanDefinitionName);
Map<Method, XxlJob> annotatedMethods = null; // referred to ：org.springframework.context.event.EventListenerMethodProcessor.processBean
try {
annotatedMethods = MethodIntrospector.selectMethods(bean.getClass(),
new MethodIntrospector.MetadataLookup<XxlJob>() {
@Override
public XxlJob inspect(Method method) {
return AnnotatedElementUtils.findMergedAnnotation(method, XxlJob.class);
}
});
} catch (Throwable ex) {
logger.error("xxl-job method-jobhandler resolve error for bean[" + beanDefinitionName + "].", ex);
}
if (annotatedMethods==null || annotatedMethods.isEmpty()) {
continue;
}
for (Map.Entry<Method, XxlJob> methodXxlJobEntry : annotatedMethods.entrySet()) {
Method executeMethod = methodXxlJobEntry.getKey();
XxlJob xxlJob = methodXxlJobEntry.getValue();
if (xxlJob == null) {
continue;
}
String name = xxlJob.value();
if (name.trim().length() == 0) {
throw new RuntimeException("xxl-job method-jobhandler name invalid, for[" + bean.getClass() + "#" + executeMethod.getName() + "] .");
}
if (loadJobHandler(name) != null) {
throw new RuntimeException("xxl-job jobhandler[" + name + "] naming conflicts.");
}
// execute method
/*if (!(method.getParameterTypes().length == 1 && method.getParameterTypes()[0].isAssignableFrom(String.class))) {
throw new RuntimeException("xxl-job method-jobhandler param-classtype invalid, for[" + bean.getClass() + "#" + method.getName() + "] , " +
"The correct method format like \" public ReturnT<String> execute(String param) \" .");
}
if (!method.getReturnType().isAssignableFrom(ReturnT.class)) {
throw new RuntimeException("xxl-job method-jobhandler return-classtype invalid, for[" + bean.getClass() + "#" + method.getName() + "] , " +
"The correct method format like \" public ReturnT<String> execute(String param) \" .");
}*/
executeMethod.setAccessible(true);
// init and destory
Method initMethod = null;
Method destroyMethod = null;
if (xxlJob.init().trim().length() > 0) {
try {
initMethod = bean.getClass().getDeclaredMethod(xxlJob.init());
initMethod.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new RuntimeException("xxl-job method-jobhandler initMethod invalid, for[" + bean.getClass() + "#" + executeMethod.getName() + "] .");
}
}
if (xxlJob.destroy().trim().length() > 0) {
try {
destroyMethod = bean.getClass().getDeclaredMethod(xxlJob.destroy());
destroyMethod.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new RuntimeException("xxl-job method-jobhandler destroyMethod invalid, for[" + bean.getClass() + "#" + executeMethod.getName() + "] .");
}
}
// registry jobhandler
//扫描所有的jobhandler
registJobHandler(name, new MethodJobHandler(bean, executeMethod, initMethod, destroyMethod));
}
}
}2. 调用父类的start() 方法 启动netty服务端
com.xxl.job.core.executor.XxlJobExecutor#initEmbedServer
核心代码见com.xxl.job.core.server.EmbedServer#start
// start server 服务端
ServerBootstrap bootstrap = new ServerBootstrap();
bootstrap.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel channel) throws Exception {
channel.pipeline()
//心跳机制
.addLast(new IdleStateHandler(0, 0, 30 * 3, TimeUnit.SECONDS)) // beat 3N, close if idle
// 使用 http 协议
.addLast(new HttpServerCodec())
// 拆包粘包
.addLast(new HttpObjectAggregator(5 * 1024 * 1024)) // merge request & reponse to FULL
// 业务处理EmbedHttpServerHandler
.addLast(new EmbedHttpServerHandler(executorBiz, accessToken, bizThreadPool));
}
})
.childOption(ChannelOption.SO_KEEPALIVE, true);
// bind
ChannelFuture future = bootstrap.bind(port).sync();
logger.info(">>>>>>>>>>> xxl-job remoting server start success, nettype = {}, port = {}", EmbedServer.class, port);
// start registry
startRegistry(appname, address);
// wait util stop
future.channel().closeFuture().sync();3. 定时任务发起一个任务执行 调用netty server段的接口
此处以手动调用为一个例子； 定时任务&时间轮见下回分析
com.xxl.job.admin.core.thread.JobTriggerPoolHelper#trigger
@startuml tomcat
JobInfoController -> JobTriggerPoolHelper: trigger()
JobTriggerPoolHelper -> XxlJobTrigger:trigger()
XxlJobTrigger -> XxlJobTrigger: processTrigger()
XxlJobTrigger -> XxlJobTrigger : runExecutor()
XxlJobTrigger -> ExecutorBizImpl :run()
@enduml
最终调用
@Override
public ReturnT<String> run(TriggerParam triggerParam) {
return XxlJobRemotingUtil.postBody(addressUrl + "run", accessToken, timeout, triggerParam, String.class);
}
