Current File : //home/waritko/yacy/source/net/yacy/kelondro/workflow/OneTimeBusyThread.java
// OneTimeBusyThread.java
// ---------------------------
// Copyright 2017 by luccioman; https://github.com/luccioman
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// LICENSE
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.yacy.kelondro.workflow;
/**
* A busy thread to run a job only once
*/
public abstract class OneTimeBusyThread extends InstantBusyThread {
/**
* Construct an instance able to run a job once, after a given delay
* @param jobName the job name used to monitor the thread
* @param startupDelay the delay in milliseconds to wait before starting the job
*/
public OneTimeBusyThread(final String jobName, final long startupDelay) {
super(jobName, Long.MIN_VALUE, Long.MIN_VALUE);
this.setStartupSleep(startupDelay);
this.setIdleSleep(-1);
this.setBusySleep(-1);
this.setMemPreReqisite(0);
this.setLoadPreReqisite(
Double.MAX_VALUE); /*
* this is called during initialization phase and some code parts depend on it;
* therefore we cannot set a prerequisite that prevents the start of that thread
*/
}
/**
* Construct an instance able to run a job once and immediately
* @param jobName the job name used to monitor the thread
*/
public OneTimeBusyThread(final String jobName) {
this(jobName, 0);
}
/**
* Construct and start a OneTimeBusyThread instance from a runnable task.
* @param task the task to run once
* @param startupDelay the delay in milliseconds to wait before starting the job
* @return a OneTimeBusyThread instance
* @throws IllegalArgumentException when the task is null
*/
public static OneTimeBusyThread startFromRunnable(final Runnable task, final long startupDelay) {
if(task == null) {
throw new IllegalArgumentException("Runnable task must not be null");
}
OneTimeBusyThread busyThread = new OneTimeBusyThread(task.getClass().getName() + ".run", startupDelay) {
@Override
public boolean jobImpl() throws Exception {
task.run();
return true;
}
};
busyThread.start();
return busyThread;
}
}
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