package com.java110.event.center;
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import com.java110.common.constant.CommonConstant;
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import com.java110.common.constant.ResponseConstant;
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import com.java110.common.exception.BusinessException;
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import com.java110.common.log.LoggerEngine;
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import com.java110.common.util.Assert;
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import com.java110.entity.center.DataFlow;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.Executor;
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import java.util.concurrent.Executors;
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/**
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* 数据流 事件发布
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* Created by wuxw on 2018/4/17.
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*/
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public class DataFlowEventPublishing extends LoggerEngine {
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private static Executor taskExecutor;
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//默认 线程数 100
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private final static int DEFAULT_THREAD_NUM = 100;
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/**
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* 保存侦听实例信息，一般启动时加载
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*/
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private final static List<DataFlowListener<?>> listeners = new ArrayList<DataFlowListener<?>>();
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/**
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* 保存事件实例信息，一般启动时加载
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*/
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private final static Map<String,Class<DataFlowEvent>> events = new HashMap<String,Class<DataFlowEvent>>();
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/**
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* 根据 事件类型查询侦听
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*/
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private final static Map<String,List<DataFlowListener<?>>> cacheListenersMap = new HashMap<String, List<DataFlowListener<?>>>();
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/**
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* 添加 侦听，这个只有启动时，单线程 处理，所以是线程安全的
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* @param listener
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*/
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public static void addListenner(DataFlowListener<?> listener){
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listeners.add(listener);
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}
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/**
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* 获取侦听（全部侦听）
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* @return
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*/
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public static List<DataFlowListener<?>> getListeners(){
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return listeners;
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}
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/**
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* 根据是否实现了某个接口，返回侦听
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* @param interfaceClassName
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* @since 1.8
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* @return
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*/
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public static List<DataFlowListener<?>> getListeners(String interfaceClassName){
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Assert.isNull(interfaceClassName,"获取需要发布的事件处理侦听时，传递事件为空，请检查");
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//先从缓存中获取，为了提升效率
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if(cacheListenersMap.containsKey(interfaceClassName)){
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return cacheListenersMap.get(interfaceClassName);
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}
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List<DataFlowListener<?>> dataFlowListeners = new ArrayList<DataFlowListener<?>>();
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for(DataFlowListener<?> listener : getListeners()){
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Type[] types = listener.getClass().getGenericInterfaces();
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for (Type type : types) {
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if (type instanceof ParameterizedType) {
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Type[] typeInterfaces = ((ParameterizedType) type).getActualTypeArguments();
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for (Type typeInterface : typeInterfaces){
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if(interfaceClassName.equals(typeInterface.getTypeName())){
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dataFlowListeners.add(listener);
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}
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}
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}
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}
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}
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//这里排序
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DataFlowListenerOrderComparator.sort(dataFlowListeners);
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//将数据放入缓存中
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cacheListenersMap.put(interfaceClassName,dataFlowListeners);
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return dataFlowListeners;
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}
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/**
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* 注册事件
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*/
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public static void addEvent(String serviceCode ,Class<DataFlowEvent> event) {
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events.put(serviceCode,event);
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}
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/**
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* 获取事件
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* @param serviceCode
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* @return
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* @throws Exception
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*/
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public static Class<DataFlowEvent> getEvent(String serviceCode) throws BusinessException{
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Class<DataFlowEvent> targetEvent = events.get(serviceCode);
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Assert.notNull(targetEvent,"改服务未注册该事件[serviceCode = "+serviceCode+"]，系统目前不支持!");
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return targetEvent;
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}
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/**
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* 发布事件
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* @param serviceCode
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* @param dataFlow
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*/
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public static void multicastEvent(String serviceCode,DataFlow dataFlow) throws BusinessException{
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multicastEvent(serviceCode,dataFlow,null);
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}
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/**
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* 发布事件
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* @param serviceCode
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* @param dataFlow 这个订单信息，以便于 侦听那边需要用
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*/
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public static void multicastEvent(String serviceCode,DataFlow dataFlow,String asyn) throws BusinessException{
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try {
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Class<DataFlowEvent> dataFlowEventClass = getEvent(serviceCode);
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Class[] parameterTypes = {Object.class, DataFlow.class};
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Constructor constructor = dataFlowEventClass.getClass().getConstructor(parameterTypes);
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Object[] parameters = {null, dataFlow};
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DataFlowEvent targetDataFlowEvent = (DataFlowEvent) constructor.newInstance(parameters);
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multicastEvent(targetDataFlowEvent, asyn);
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}catch (Exception e){
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throw new BusinessException(ResponseConstant.RESULT_CODE_INNER_ERROR,"发布侦听失败，失败原因为："+e);
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}
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}
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/**
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* 发布事件
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* @param event
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* @param asyn A 表示异步处理
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*/
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public static void multicastEvent(final DataFlowEvent event,String asyn) {
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for (final DataFlowListener<?> listener : getListeners(event.getClass().getName())) {
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if(CommonConstant.PROCESS_ORDER_ASYNCHRONOUS.equals(asyn)){ //异步处理
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Executor executor = getTaskExecutor();
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executor.execute(new Runnable() {
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@Override
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public void run() {
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invokeListener(listener, event);
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}
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});
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}
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else {
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invokeListener(listener, event);
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}
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}
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}
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/**
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* Return the current task executor for this multicaster.
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*/
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protected static synchronized Executor getTaskExecutor() {
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if(taskExecutor == null) {
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taskExecutor = Executors.newFixedThreadPool(DEFAULT_THREAD_NUM);
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}
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return taskExecutor;
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}
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/**
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* Invoke the given listener with the given event.
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* @param listener the ApplicationListener to invoke
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* @param event the current event to propagate
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* @since 4.1
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*/
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@SuppressWarnings({"unchecked", "rawtypes"})
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protected static void invokeListener(DataFlowListener listener, DataFlowEvent event) {
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try {
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listener.soService(event);
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}catch (Exception e){
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LoggerEngine.error("发布侦听失败",e);
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throw new RuntimeException("发布侦听失败,"+listener+ event + e);
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}
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}
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}
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