/*******************************************************************************
* Copyright (c) 2016 Association for Decentralized Information Management in
* Industry THTH ry.
* 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:
* Semantum Oy - initial API and implementation
*******************************************************************************/
package org.simantics.db.indexing.internal;
import java.util.concurrent.Semaphore;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.jobs.Job;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.function.DbConsumer;
import org.simantics.db.indexing.exception.IndexingException;
/**
* @author Tuukka Lehtonen
* @since 1.22.2, 1.25.0
*/
public abstract class IndexingJob extends Job {
/**
* NOTE: this is intentionally the same as
* org.simantics.DatabaseJob.DATABASE_JOB_FAMILY
in order for
* this job to cause the same UI-behavior as DatabaseJob.
*/
private static final String DATABASE_JOB_FAMILY = "org.simantics.db.inDatabaseJob";
public IndexingJob(String name) {
super(name);
}
@Override
public boolean belongsTo(Object family) {
return DATABASE_JOB_FAMILY.equals(family);
}
/**
* @param monitor
* @param jobName
* @param consumer
* @throws DatabaseException
*/
public static void jobifyIfPossible(
IProgressMonitor monitor,
String jobName,
DbConsumer consumer)
throws DatabaseException
{
// Prevent deadlocks by checking preconditions for using a job.
// JobManager is suspended e.g. during workbench startup.
if (Job.getJobManager().isSuspended() || Job.getJobManager().currentJob() != null) {
consumer.accept(monitor);
return;
}
Semaphore barrier = new Semaphore(0);
Throwable[] err = { null };
IndexingJob job = new IndexingJob(jobName) {
@Override
protected IStatus run(IProgressMonitor monitor) {
try {
consumer.accept(monitor);
} catch (Throwable t) {
err[0] = t;
} finally {
monitor.done();
barrier.release();
}
return org.eclipse.core.runtime.Status.OK_STATUS;
}
};
job.schedule();
try {
barrier.acquire();
if (err[0] != null) {
if (err[0] instanceof IndexingException)
throw (DatabaseException) err[0];
throw new IndexingException(err[0]);
}
} catch (InterruptedException e) {
throw new IndexingException(e);
}
}
}