001/** 002 * Copyright (C) 2012 FuseSource, Inc. 003 * http://fusesource.com 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.fusesource.hawtdispatch; 019 020import java.util.LinkedList; 021import java.util.concurrent.Executor; 022 023import static org.fusesource.hawtdispatch.Dispatch.*; 024 025/** 026 * Sends runnable tasks to a DispatchQueue via a an EventAggregator 027 * so that they first batch up on the sender side before being 028 * sent to the DispatchQueue which then executes that tasks. 029 * 030 * @author <a href="http://hiramchirino.com">Hiram Chirino</a> 031 */ 032public class AggregatingExecutor implements Executor { 033 034 final DispatchQueue queue; 035 final CustomDispatchSource<Runnable, LinkedList<Runnable>> source; 036 037 public AggregatingExecutor(DispatchQueue queue) { 038 this.queue = queue; 039 this.source = createSource(EventAggregators.<Runnable>linkedList(), queue); 040 this.source.setEventHandler(new Task() { 041 public void run() { 042 for (Runnable runnable: source.getData() ) { 043 try { 044 runnable.run(); 045 } catch (Exception e) { 046 Thread thread = Thread.currentThread(); 047 thread.getUncaughtExceptionHandler().uncaughtException(thread, e); 048 } 049 } 050 } 051 }); 052 this.source.resume(); 053 } 054 055 056 public void suspend() { 057 source.suspend(); 058 } 059 060 public void resume() { 061 source.resume(); 062 } 063 064 public void execute(Runnable task) { 065 if (getCurrentQueue() == null) { 066 queue.execute(new TaskWrapper(task)); 067 } else { 068 source.merge(task); 069 } 070 } 071 072}