| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.alibaba.jstorm.event; |
| |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.alibaba.jstorm.callback.RunnableCallback; |
| |
| /** |
| * Event Manager, drop one event from queue, then execute the event. |
| */ |
| public class EventManagerImp extends RunnableCallback implements EventManager { |
| private static final Logger LOG = LoggerFactory.getLogger(EventManagerImp.class); |
| |
| private AtomicInteger added = new AtomicInteger(); |
| private AtomicInteger processed = new AtomicInteger(); |
| |
| private LinkedBlockingQueue<RunnableCallback> queue = new LinkedBlockingQueue<RunnableCallback>(); |
| |
| private Exception e; |
| |
| public void proccessinc() { |
| processed.incrementAndGet(); |
| } |
| |
| @Override |
| public void add(RunnableCallback event_fn) { |
| added.incrementAndGet(); |
| queue.add(event_fn); |
| } |
| |
| @Override |
| public boolean waiting() { |
| return (processed.get() == added.get()); |
| |
| } |
| |
| @Override |
| public Exception error() { |
| return e; |
| } |
| |
| @Override |
| public void run() { |
| try { |
| RunnableCallback r = queue.take(); |
| if (r == null) { |
| |
| return; |
| } |
| |
| r.run(); |
| |
| e = r.error(); |
| |
| proccessinc(); |
| |
| } catch (InterruptedException e) { |
| LOG.info("InterruptedException when processing event "); |
| } |
| |
| } |
| } |