org.eclipse.core.runtime.jobs.IJobChangeListener Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2003, 2012 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.core.runtime.jobs;
import java.util.function.Consumer;
/**
* Callback interface for clients interested in being notified when jobs change
* state.
*
* A single job listener instance can be added either to the job manager, for
* notification of all scheduled jobs, or to any set of individual jobs. A
* single listener instance should not be added to both the job manager, and to
* individual jobs (such a listener may receive duplicate notifications).
*
*
* Clients should not rely on the result of the Job#getState()
* method on jobs for which notification is occurring. Listeners are notified of
* all job state changes, but whether the state change occurs before, during, or
* after listeners are notified is unspecified.
*
*
* It is undefined in which Thread the notification occurs.
*
*
* Clients may implement this interface.
*
*
* @see JobChangeAdapter
* @see IJobManager#addJobChangeListener(IJobChangeListener)
* @see IJobManager#removeJobChangeListener(IJobChangeListener)
* @see Job#addJobChangeListener(IJobChangeListener)
* @see Job#getState()
* @see Job#removeJobChangeListener(IJobChangeListener)
* @since 3.0
*/
public interface IJobChangeListener {
/**
*
* Notification that a job is about to be run. Listeners are allowed to sleep,
* cancel, or change the priority of the job before it is started (and as a
* result may prevent the run from actually occurring).
*
*
* Implementations should not block and return promptly.
*
*
* @param event the event details
*/
void aboutToRun(IJobChangeEvent event);
/**
*
* Notification that a job was previously sleeping and has now been rescheduled
* to run.
*
*
* Implementations should not block and return promptly.
*
*
* @param event the event details
*/
void awake(IJobChangeEvent event);
/**
*
* Notification that a job has completed execution, either due to cancelation,
* successful completion, or failure. The event status object indicates how the
* job finished, and the reason for failure, if applicable.
*
*
* Implementations should not block and return promptly.
*
*
* @param event the event details
*/
void done(IJobChangeEvent event);
/**
*
* Notification that a job has started running.
*
*
* Implementations should not block and return promptly.
*
*
* @param event the event details
*/
void running(IJobChangeEvent event);
/**
*
* Notification that a job is being added to the queue of scheduled jobs. The
* event details includes the scheduling delay before the job should start
* running.
*
*
* Implementations should not block and return promptly.
*
*
* @param event the event details, including the job instance and the scheduling
* delay
*/
void scheduled(IJobChangeEvent event);
/**
*
* Notification that a job was waiting to run and has now been put in the
* sleeping state.
*
*
* Implementations should not block and return promptly.
*
*
* @param event the event details
*/
void sleeping(IJobChangeEvent event);
/**
* Static helper method to create an IJobChangeListener
for the
* {@link #done(IJobChangeEvent)}) method, given a lambda expression or a method
* reference.
*
* @param c the consumer of the event
* @return IJobChangeAdapter
* @since 3.15
*/
static IJobChangeListener onDone(Consumer c) {
return new JobChangeAdapter() {
@Override
public void done(IJobChangeEvent event) {
c.accept(event);
}
};
}
}