##参数 reactor-core-2.0.8.RELEASE-sources.jar!/reactor/core/dispatch/ThreadPoolExecutorDispatcher.java

/**
	 * Create a new {@literal ThreadPoolExecutorDispatcher} with the given size,backlog,name,and {@link
	 * java.util.concurrent.RejectedExecutionHandler}.
	 *
	 * @param poolSize
	 * 		the pool size
	 * @param backlog
	 * 		the backlog size
	 * @param threadName
	 * 		the name prefix to use when creating threads
	 * @param rejectedExecutionHandler
	 * 		the {@code RejectedExecutionHandler} to use when jobs can't be submitted to the thread pool
	 */
	public ThreadPoolExecutorDispatcher(int poolSize,int backlog,String threadName,BlockingQueue<Runnable> workQueue,RejectedExecutionHandler rejectedExecutionHandler) {
		super(poolSize,backlog);
		this.workQueue = workQueue;
		this.executor = new ThreadPoolExecutor(
				poolSize,poolSize,0L,TimeUnit.MILLISECONDS,workQueue,new NamedDaemonThreadFactory(threadName,getContext()),rejectedExecutionHandler
		);
	}

配置文件的size，对应ThreadPoolExecutor的corePoolSize以及maximumPoolSize

##自定义ThreadPoolExecutorDispatcher

Dispatcher dispatcher = new ThreadPoolExecutorDispatcher(5,2048,"dispatcherGroup",new LinkedBlockingQueue<Runnable>(2048),new ThreadPoolExecutor.DiscardOldestPolicy());
EventBus eventBus = EventBus.create(eventBusEnv,dispatcher);