com.github.sviperll.tasks.RepeatingTask Maven / Gradle / Ivy
/*
* Copyright (c) 2014, Victor Nazarov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Victor Nazarov nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.github.sviperll.tasks;
/**
* TaskDefinition that when perform repeatedly calles perform method of it's subtask
* Given pause is performed between invokations of subtask
* Stop method breaks repeating cycle
*/
public class RepeatingTask implements TaskDefinition {
private volatile boolean doExit = false;
private final TaskDefinition task;
private final long pause;
/**
*
* @param task subtask
* @param pause pause between subtask invokations in milliseconds
*/
public RepeatingTask(TaskDefinition task, long pause) {
this.task = task;
this.pause = pause;
}
/**
* Calls signalKill method of currently running subtask
* Stop repeating subtask
*/
@Override
public void signalKill() {
doExit = true;
task.signalKill();
}
/**
* Runs an repeats subtask with given pause between invokations
*/
@Override
public void perform() {
try {
while (!doExit) {
task.perform();
try {
Thread.sleep(pause);
} catch (InterruptedException ex) {
}
}
} finally {
doExit = false;
}
}
/**
* Performes subtask cleanup as is, i. e. calls subtask's #signalKill method
*/
@Override
public void cleanup() {
task.cleanup();
}
}