xxl-job原理-- 执行器注册
- 执行器注册
需要有一个调度中心，其他注册器将自己注册到调度中心，然后就可以接任务了。
缺点， 调度中心不能自我注册
2. 注册方式
自动注册
手动录入
主动注册中就是在配置中心，设置配置信息 xxl.job.admin.address=, xxl.job.executor.appName=, 注意appName不可以重复
手动录入，其中的Appname是不能重复的
自动注册流程
在执行器启动时会读取配置，当存在任务调度中心地址会依次向任务调度中心注册其地址.
填写配置信息
xxl-job admin address list, such as "http://address" or "http://address01,http://address02"
任务调度中心地址, 多个地址有逗号隔开
xxl.job.admin.addresses=http://127.0.0.1:7995/xxl-job-admin/
xxl-job executor address
任务调度器名称和机器信息
xxl.job.executor.appname=xxl-job-executor-sample
xxl.job.executor.ip=127.0.0.1
xxl.job.executor.port=9999
查找流程
xxl-job-executor-service
@Configuration 注解的XxlJobConfig ----> @Bean 修饰的xxlJobExecutor方法
@Bean(initMethod = "start", destroyMethod = "destroy")
public XxlJobSpringExecutor xxlJobExecutor() {
// xxl-job 配置信息初始化， 初始化 执行器的基本信息， appname, ip, port, accessToken, logpath, logretentionDays
logger.info(">>>>>>>>>>> xxl-job config init.");
XxlJobSpringExecutor xxlJobSpringExecutor = new XxlJobSpringExecutor();
xxlJobSpringExecutor.setAdminAddresses(adminAddresses);
xxlJobSpringExecutor.setAppName(appName);
xxlJobSpringExecutor.setIp(ip);
xxlJobSpringExecutor.setPort(port);
xxlJobSpringExecutor.setAccessToken(accessToken);
xxlJobSpringExecutor.setLogPath(logPath);
xxlJobSpringExecutor.setLogRetentionDays(logRetentionDays);
return xxlJobSpringExecutor;
}
注意@Bean的 initMethod 与 destroyMethod
xxl-job-core:2.0.2
public class XxlJobSpringExecutor extends XxlJobExecutor implements ApplicationContextAware {
@Override
public void start() throws Exception {
// init JobHandler Repository
initJobHandlerRepository(applicationContext);
// refresh GlueFactory
GlueFactory.refreshInstance(1);
// super start
super.start();
}
private void initJobHandlerRepository(ApplicationContext applicationContext){
...
// init job handler action, 根据应用上下文获取ServiceBeanMap,
// ServiceBeanMap的value包含IJobHandler的子类
// class DemoJobHandler extends IJobHandler , 该DemoJobHandler 就是
Map<String, Object> serviceBeanMap = applicationContext.getBeansWithAnnotation(JobHandler.class);
if (serviceBeanMap!=null && serviceBeanMap.size()>0) {
for (Object serviceBean : serviceBeanMap.values()) {
if (serviceBean instanceof IJobHandler){
// 获取@JobHandler(value="demoJobHandler") 定义的value值
String name = serviceBean.getClass().getAnnotation(JobHandler.class).value();
IJobHandler handler = (IJobHandler) serviceBean;
// 从jobHandlerRepository中查找demoJobHandler值， 如果有，抛出异常
if (loadJobHandler(name) != null) {
throw new RuntimeException("xxl-job jobhandler naming conflicts.");
}
// 没有就将该demoJobHandler 注册到 jobHandlerRepository中， xxl-job register jobhandler success
// jobHandlerRepository 是有ConcurrentHashMap 类， key: String, value : IJobHandler以及子类
registJobHandler(name, handler);
}
}
}
}
......
}
XxlJobExecutor
public static IJobHandler loadJobHandler(String name){
return jobHandlerRepository.get(name);
}
GlueFactory
// 创建glueFactory实例， 用于根据name生成实例
public static void refreshInstance(int type){
if (type == 0) {
glueFactory = new GlueFactory();
} else if (type == 1) {
// 主要使用SpringGlueFactory
glueFactory = new SpringGlueFactory();
}
}
XxlJobExecutor.start()
// ---------------------- start + stop ----------------------
public void start() throws Exception {
// init logpath
// 初始化log日志文件，
// 默认的日志路径为/data/applogs/xxl-job/jobhandler
// 如果日志不存在就设置为/data/applogs/xxl-job/jobhandler， 创建响应的目录，
// 如果/data/applogs/xxl-job/jobhandler/gluesource不存在，就创建
XxlJobFileAppender.initLogPath(logPath);
// init invoker, admin-client
initAdminBizList(adminAddresses, accessToken);
// init JobLogFileCleanThread
JobLogFileCleanThread.getInstance().start(logRetentionDays);
// init TriggerCallbackThread
TriggerCallbackThread.getInstance().start();
// init executor-server
port = port>0?port: NetUtil.findAvailablePort(9999);
ip = (ip!=null&&ip.trim().length()>0)?ip: IpUtil.getIp();
initRpcProvider(ip, port, appName, accessToken);
}
XxlJobExecutor.initAdminBizList
// ---------------------- admin-client (rpc invoker) ----------------------
private static List
private static Serializer serializer;
//当存在多个任务调度中心时，创建代理类并注册，在NetComClientProxy
private void initAdminBizList(String adminAddresses, String accessToken) throws Exception {
// 获取Serializer(抽象类) 子类实例
serializer = Serializer.SerializeEnum.HESSIAN.getSerializer();
// 当存在多个任务调度中心
if (adminAddresses!=null && adminAddresses.trim().length()>0) {
for (String address: adminAddresses.trim().split(",")) {
if (address!=null && address.trim().length()>0) {
// address 连接上/api
String addressUrl = address.concat(AdminBiz.MAPPING);
// 构建 xxlRpcRefrenceBean 实例 ， 注意这些属性信息
AdminBiz adminBiz = (AdminBiz) new XxlRpcReferenceBean(
// 使用 netty_http 实现RPC, 在v2.0.1 使用的是 Jetty_http , v2.0.2 使用的是Netty_http
NetEnum.NETTY_HTTP,
// Serializer 实例
serializer,
// CallType 调用方式， SYNC 同步
CallType.SYNC,
// LoadBalance 方式， 路由策略为 轮询
LoadBalance.ROUND,
// AdminBiz 类
AdminBiz.class,
// version 版本
null,
// timeout 超时时间
10000,
// 注册中心地址
addressUrl,
// 权限控制
accessToken,
// invokeCallback 回调
null,
// invokerFactory 调用工厂
null
).getObject(); // 使用动态代理生成AdminBiz 实现类
// 存储 adminBiz实例
if (adminBizList == null) {
adminBizList = new ArrayList
}
adminBizList.add(adminBiz);
}
}
}
}
getObject
XxlRpcReferenceBean
public Object getObject() {
// 使用动态代理，生成代理类
return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class[]{this.iface}, new InvocationHandler() {
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
String className = method.getDeclaringClass().getName();
String varsion_ = XxlRpcReferenceBean.this.version;
String methodName = method.getName();
Class[] parameterTypes = method.getParameterTypes();
Object[] parameters = args;
if (className.equals(XxlRpcGenericService.class.getName()) && methodName.equals("invoke")) {
Class[] paramTypes = null;
if (args[3] != null) {
String[] paramTypes_str = (String[])((String[])args[3]);
if (paramTypes_str.length > 0) {
paramTypes = new Class[paramTypes_str.length];
for(int i = 0; i < paramTypes_str.length; ++i) {
paramTypes[i] = ClassUtil.resolveClass(paramTypes_str[i]);
}
}
}
className = (String)args[0];
varsion_ = (String)args[1];
methodName = (String)args[2];
parameterTypes = paramTypes;
parameters = (Object[])((Object[])args[4]);
}
if (className.equals(Object.class.getName())) {
XxlRpcReferenceBean.logger.info(">>>>>>>>>>> xxl-rpc proxy class-method not support [{}#{}]", className, methodName);
throw new XxlRpcException("xxl-rpc proxy class-method not support");
} else {
String finalAddress = XxlRpcReferenceBean.this.address;
if ((finalAddress == null || finalAddress.trim().length() == 0) && XxlRpcReferenceBean.this.invokerFactory != null && XxlRpcReferenceBean.this.invokerFactory.getServiceRegistry() != null) {
String serviceKey = XxlRpcProviderFactory.makeServiceKey(className, varsion_);
TreeSet<String> addressSet = XxlRpcReferenceBean.this.invokerFactory.getServiceRegistry().discovery(serviceKey);
if (addressSet != null && addressSet.size() != 0) {
if (addressSet.size() == 1) {
finalAddress = (String)addressSet.first();
} else {
finalAddress = XxlRpcReferenceBean.this.loadBalance.xxlRpcInvokerRouter.route(serviceKey, addressSet);
}
}
}
if (finalAddress != null && finalAddress.trim().length() != 0) {
XxlRpcRequest xxlRpcRequest = new XxlRpcRequest();
xxlRpcRequest.setRequestId(UUID.randomUUID().toString());
xxlRpcRequest.setCreateMillisTime(System.currentTimeMillis());
xxlRpcRequest.setAccessToken(XxlRpcReferenceBean.this.accessToken);
xxlRpcRequest.setClassName(className);
xxlRpcRequest.setMethodName(methodName);
xxlRpcRequest.setParameterTypes(parameterTypes);
xxlRpcRequest.setParameters(parameters);
XxlRpcFutureResponse futureResponse;
// 使用同步调用方式，底层使用netty_http，执行RPC框架， 调用调度中心方法
if (CallType.SYNC == XxlRpcReferenceBean.this.callType) {
// 构建xxlRpc 回调的结果对象
futureResponse = new XxlRpcFutureResponse(XxlRpcReferenceBean.this.invokerFactory, xxlRpcRequest, (XxlRpcInvokeCallback)null);
Object var31;
try {
XxlRpcReferenceBean.this.client.asyncSend(finalAddress, xxlRpcRequest);
// 得到返回结果对象
XxlRpcResponse xxlRpcResponse = futureResponse.get(XxlRpcReferenceBean.this.timeout, TimeUnit.MILLISECONDS);
if (xxlRpcResponse.getErrorMsg() != null) {
throw new XxlRpcException(xxlRpcResponse.getErrorMsg());
}
// 返回结果
var31 = xxlRpcResponse.getResult();
} catch (Exception var21) {
XxlRpcReferenceBean.logger.info(">>>>>>>>>>> xxl-rpc, invoke error, address:{}, XxlRpcRequest{}", finalAddress, xxlRpcRequest);
throw (Throwable)(var21 instanceof XxlRpcException ? var21 : new XxlRpcException(var21));
} finally {
futureResponse.removeInvokerFuture();
}
return var31;
} else if (CallType.FUTURE == XxlRpcReferenceBean.this.callType) {
futureResponse = new XxlRpcFutureResponse(XxlRpcReferenceBean.this.invokerFactory, xxlRpcRequest, (XxlRpcInvokeCallback)null);
try {
XxlRpcInvokeFuture invokeFuture = new XxlRpcInvokeFuture(futureResponse);
XxlRpcInvokeFuture.setFuture(invokeFuture);
XxlRpcReferenceBean.this.client.asyncSend(finalAddress, xxlRpcRequest);
return null;
} catch (Exception var20) {
XxlRpcReferenceBean.logger.info(">>>>>>>>>>> xxl-rpc, invoke error, address:{}, XxlRpcRequest{}", finalAddress, xxlRpcRequest);
futureResponse.removeInvokerFuture();
throw (Throwable)(var20 instanceof XxlRpcException ? var20 : new XxlRpcException(var20));
}
} else if (CallType.CALLBACK == XxlRpcReferenceBean.this.callType) {
XxlRpcInvokeCallback finalInvokeCallback = XxlRpcReferenceBean.this.invokeCallback;
XxlRpcInvokeCallback threadInvokeCallback = XxlRpcInvokeCallback.getCallback();
if (threadInvokeCallback != null) {
finalInvokeCallback = threadInvokeCallback;
}
if (finalInvokeCallback == null) {
throw new XxlRpcException("xxl-rpc XxlRpcInvokeCallback（CallType=" + CallType.CALLBACK.name() + "） cannot be null.");
} else {
XxlRpcFutureResponse futureResponsex = new XxlRpcFutureResponse(XxlRpcReferenceBean.this.invokerFactory, xxlRpcRequest, finalInvokeCallback);
try {
XxlRpcReferenceBean.this.client.asyncSend(finalAddress, xxlRpcRequest);
return null;
} catch (Exception var19) {
XxlRpcReferenceBean.logger.info(">>>>>>>>>>> xxl-rpc, invoke error, address:{}, XxlRpcRequest{}", finalAddress, xxlRpcRequest);
futureResponsex.removeInvokerFuture();
throw (Throwable)(var19 instanceof XxlRpcException ? var19 : new XxlRpcException(var19));
}
}
} else if (CallType.ONEWAY == XxlRpcReferenceBean.this.callType) {
XxlRpcReferenceBean.this.client.asyncSend(finalAddress, xxlRpcRequest);
return null;
} else {
throw new XxlRpcException("xxl-rpc callType[" + XxlRpcReferenceBean.this.callType + "] invalid");
}
} else {
throw new XxlRpcException("xxl-rpc reference bean[" + className + "] address empty");
}
}
}
});
}
通过测试，查看注册的代码走向
1
实际还是调用 AdminBizImpl .registry方法。
如何实现自我注册
最简单的方式：
设置RegistryParam对象属性，
将admin所在机器的地址与配置文件中端口号，配置文件中xxl.job.executor.appname的属性注入其中。
然后调用AdminBizImpl.registry(RegistryParam)方法即可
总结
执行器注册流程如下：
- init JobHandler Repository
- refresh GlueFactory
- super start
init logpath
init invoker, admin-client 利用反射，向注册中心注册自己，并将adminBiz缓存起来
init JobLogFileCleanThread 处理jobLog日志
init TriggerCallbackThread 处理 触发周期性 回调， callback 和 retry
init executor-server initRpcProvider 启动serviceRegister注册
init, provider factory （ExecutorServiceRegistry）
add services 将该执行器以服务的形式加入
start 会利用netty 开启一个server, port: 9999,
还会开启有一个ExecutorRegistryThread线程，不断地注册自己
问题： 自我注册成功， 但是注册之前的执行器丢失， 而且新注册的执行器无法显示
作者：Gavin_Alison
链接：https://www.jianshu.com/p/d70b78a704e5
来源：简书
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