hudson.model.TaskThread Maven / Gradle / Ivy
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/*******************************************************************************
*
* Copyright (c) 2004-2009 Oracle Corporation.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
*
* Kohsuke Kawaguchi, Red Hat, Inc.
*
*
*******************************************************************************/
package hudson.model;
import hudson.console.AnnotatedLargeText;
import hudson.util.StreamTaskListener;
import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.lang.ref.WeakReference;
import java.nio.charset.Charset;
import org.kohsuke.stapler.framework.io.LargeText;
import org.kohsuke.stapler.framework.io.ByteBuffer;
/**
* {@link Thread} for performing one-off task.
*
* Designed to be used inside {@link TaskAction}.
*
*
*
* @author Kohsuke Kawaguchi
* @since 1.191
* @see TaskAction
*/
public abstract class TaskThread extends Thread {
/**
* @deprecated as of Hudson 1.350 Use {@link #log}. It's the same object, in
* a better type.
*/
private final LargeText text;
/**
* Represents the output from this task thread.
*/
private final AnnotatedLargeText log;
/**
* Represents the interface to produce output.
*/
private TaskListener listener;
private final TaskAction owner;
private volatile boolean isRunning;
/**
*
* @param output Determines where the output from this task thread goes.
*/
protected TaskThread(TaskAction owner, ListenerAndText output) {
//FIXME this failed to compile super(owner.getBuild().toString()+' '+owner.getDisplayName());
//Please implement more general way how to get information about action owner,
//if you want it in the thread's name.
super(owner.getDisplayName());
this.owner = owner;
this.text = this.log = output.text;
this.listener = output.listener;
}
public Reader readAll() throws IOException {
// this method can be invoked from another thread.
return text.readAll();
}
/**
* Registers that this {@link TaskThread} is run for the specified
* {@link TaskAction}. This can be explicitly called from subtypes to
* associate a single {@link TaskThread} across multiple tag actions.
*/
protected final void associateWith(TaskAction action) {
action.workerThread = this;
action.log = new WeakReference(log);
}
/**
* Starts the task execution asynchronously.
*/
@Override
public void start() {
associateWith(owner);
super.start();
}
public boolean isRunning() {
return isRunning;
}
/**
* Determines where the output of this {@link TaskThread} goes. Subclass
* can override this to send the output to a file, for example.
*/
protected ListenerAndText createListener() throws IOException {
return ListenerAndText.forMemory();
}
@Override
public final void run() {
isRunning = true;
try {
perform(listener);
listener.getLogger().println("Completed");
owner.workerThread = null;
} catch (InterruptedException e) {
listener.getLogger().println("Aborted");
} catch (Exception e) {
e.printStackTrace(listener.getLogger());
} finally {
listener = null;
isRunning = false;
}
log.markAsComplete();
}
/**
* Do the actual work.
*
* @throws Exception The exception is recorded and reported as a failure.
*/
protected abstract void perform(TaskListener listener) throws Exception;
/**
* Tuple of {@link TaskListener} and {@link AnnotatedLargeText},
* representing the interface for producing output and how to retrieve it
* later.
*/
public static final class ListenerAndText {
final TaskListener listener;
final AnnotatedLargeText text;
public ListenerAndText(TaskListener listener, AnnotatedLargeText text) {
this.listener = listener;
this.text = text;
}
/**
* @deprecated as of Hudson 1.350 Use {@link #forMemory(TaskThread)} and
* pass in the calling {@link TaskAction}
*/
public static ListenerAndText forMemory() {
return forMemory(null);
}
/**
* @deprecated as of Hudson 1.350 Use {@link #forFile(File, TaskThread)}
* and pass in the calling {@link TaskAction}
*/
public static ListenerAndText forFile(File f) throws IOException {
return forFile(f, null);
}
/**
* Creates one that's backed by memory.
*/
public static ListenerAndText forMemory(TaskThread context) {
// StringWriter is synchronized
ByteBuffer log = new ByteBuffer();
return new ListenerAndText(
new StreamTaskListener(log),
new AnnotatedLargeText(log, Charset.defaultCharset(), false, context));
}
/**
* Creates one that's backed by a file.
*/
public static ListenerAndText forFile(File f, TaskThread context) throws IOException {
return new ListenerAndText(
new StreamTaskListener(f),
new AnnotatedLargeText(f, Charset.defaultCharset(), false, context));
}
}
}