Java tutorial
/** * 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.daemon.worker.timer; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; import org.apache.commons.lang.builder.ToStringBuilder; import org.apache.commons.lang.builder.ToStringStyle; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import backtype.storm.utils.DisruptorQueue; import com.lmax.disruptor.InsufficientCapacityException; public class TimerTrigger implements Runnable { private static final Logger LOG = LoggerFactory.getLogger(TimerTrigger.class); private static ScheduledExecutorService threadPool; public static void setScheduledExecutorService(ScheduledExecutorService scheduledExecutorService) { threadPool = scheduledExecutorService; } protected String name; protected int opCode; protected int firstTime; protected int frequence; protected DisruptorQueue queue = null; protected Object object; protected boolean block = true; public void register() { register(TimeUnit.SECONDS); } public void register(TimeUnit timeUnit) { threadPool.scheduleAtFixedRate(this, firstTime, frequence, timeUnit); LOG.info("Successfully register timer " + this); } public void updateObject() { } @Override public void run() { try { updateObject(); if (object == null) { LOG.info("Timer " + name + " 's object is null "); return; } TimerEvent event = new TimerEvent(opCode, object); queue.publish(event, block); } catch (InsufficientCapacityException e) { LOG.warn("Failed to public timer event to " + name); return; } catch (Exception e) { LOG.warn("Failed to public timer event to " + name, e); return; } LOG.debug(" Trigger timer event to " + name); } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getOpCode() { return opCode; } public void setOpCode(int opCode) { this.opCode = opCode; } public int getFirstTime() { return firstTime; } public void setFirstTime(int firstTime) { this.firstTime = firstTime; } public int getFrequence() { return frequence; } public void setFrequence(int frequence) { this.frequence = frequence; } public DisruptorQueue getQueue() { return queue; } public void setQueue(DisruptorQueue queue) { this.queue = queue; } public Object getObject() { return object; } public void setObject(Object object) { this.object = object; } public boolean isBlock() { return block; } public void setBlock(boolean block) { this.block = block; } @Override public String toString() { return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE); } public class TimerEvent { private int opCode; private Object msg; public TimerEvent(int opCode, Object msg) { this.opCode = opCode; this.msg = msg; } public int getOpCode() { return opCode; } public Object getMsg() { return msg; } } }