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/*******************************************************************************
* Copyright (c) 2008-2010 Sonatype, Inc.
* 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:
* Sonatype, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.m2e.core.internal.project.registry;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;
import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;
import org.eclipse.m2e.core.embedder.IMavenConfiguration;
import org.eclipse.m2e.core.internal.Messages;
import org.eclipse.m2e.core.internal.jobs.IBackgroundProcessingQueue;
import org.eclipse.m2e.core.project.IMavenProjectFacade;
import org.eclipse.m2e.core.project.MavenUpdateRequest;
public class ProjectRegistryRefreshJob extends Job implements IResourceChangeListener, IPreferenceChangeListener, IBackgroundProcessingQueue {
private static final Logger log = LoggerFactory.getLogger(ProjectRegistryRefreshJob.class);
private static final long SCHEDULE_DELAY = 1000L;
private static final int DELTA_FLAGS = IResourceDelta.CONTENT | IResourceDelta.MOVED_FROM | IResourceDelta.MOVED_TO
| IResourceDelta.COPIED_FROM | IResourceDelta.REPLACED;
private final List<MavenUpdateRequest> queue = new ArrayList<MavenUpdateRequest>();
private final ProjectRegistryManager manager;
private final IMavenConfiguration mavenConfiguration;
public ProjectRegistryRefreshJob(ProjectRegistryManager manager, IMavenConfiguration mavenConfiguration) {
super(Messages.ProjectRegistryRefreshJob_title);
this.manager = manager;
this.mavenConfiguration = mavenConfiguration;
}
public void refresh(MavenUpdateRequest updateRequest) {
queue(updateRequest);
schedule(SCHEDULE_DELAY);
}
// Job
public IStatus run(IProgressMonitor monitor) {
monitor.beginTask(Messages.ProjectRegistryRefreshJob_task_refreshing, IProgressMonitor.UNKNOWN);
ArrayList<MavenUpdateRequest> requests;
synchronized(this.queue) {
requests = new ArrayList<MavenUpdateRequest>(this.queue);
this.queue.clear();
}
try {
MutableProjectRegistry newState = manager.newMutableProjectRegistry();
try {
for (MavenUpdateRequest request : requests) {
if(monitor.isCanceled()) {
throw new OperationCanceledException();
}
manager.refresh(newState, request, monitor);
}
ISchedulingRule rule = ResourcesPlugin.getWorkspace().getRoot();
getJobManager().beginRule(rule, monitor);
try {
manager.applyMutableProjectRegistry(newState, monitor);
} finally {
getJobManager().endRule(rule);
}
} finally {
newState.close();
}
} catch(CoreException ex) {
log.error(ex.getMessage(), ex);
} catch(OperationCanceledException ex) {
log.info("{} was canceled", getClass().getName());
} catch (StaleMutableProjectRegistryException e) {
synchronized(this.queue) {
this.queue.addAll(0, requests);
if(!this.queue.isEmpty()) {
schedule(SCHEDULE_DELAY);
}
}
} catch(Exception ex) {
log.error(ex.getMessage(), ex);
} finally {
monitor.done();
}
return Status.OK_STATUS;
}
// IResourceChangeListener
public void resourceChanged(IResourceChangeEvent event) {
boolean offline = mavenConfiguration.isOffline();
boolean forceDependencyUpdate = false;
int type = event.getType();
if(IResourceChangeEvent.PRE_CLOSE == type || IResourceChangeEvent.PRE_DELETE == type) {
queue(new MavenUpdateRequest((IProject) event.getResource(), offline, forceDependencyUpdate));
} else {
// if (IResourceChangeEvent.POST_CHANGE == type)
IWorkspace workspace = ResourcesPlugin.getWorkspace();
boolean autobuilding = workspace != null && workspace.isAutoBuilding();
// MavenBuilder will synchronously read/refresh workspace Maven project state.
// To avoid double-work and/or locking between MavenBuilder and background registry refresh job, we skip project
// refresh when workspace is autobuilding.
// We still refresh opened projects because workspace does not run build after project open event.
IResourceDelta delta = event.getDelta(); // workspace delta
IResourceDelta[] projectDeltas = delta.getAffectedChildren();
Set<IProject> refreshProjects = new LinkedHashSet<IProject>();
for(int i = 0; i < projectDeltas.length; i++ ) {
IResourceDelta projectDelta = projectDeltas[i];
if((projectDelta.getFlags() & IResourceDelta.OPEN) != 0) {
queue(new MavenUpdateRequest((IProject) projectDelta.getResource(), offline, forceDependencyUpdate));
} else if(!autobuilding && projectChanged(projectDelta)) {
IProject project = (IProject) projectDelta.getResource();
IMavenProjectFacade facade = manager.getProject(project);
if(facade == null || facade.isStale()) {
// facade is up-to-date for resource change events fired right after project import
refreshProjects.add(project);
}
}
}
if(!refreshProjects.isEmpty()) {
IProject[] projects = refreshProjects.toArray(new IProject[refreshProjects.size()]);
MavenUpdateRequest updateRequest = new MavenUpdateRequest(projects, offline, forceDependencyUpdate);
queue(updateRequest);
}
}
synchronized(queue) {
if(!queue.isEmpty()) {
schedule(SCHEDULE_DELAY);
}
}
}
private boolean projectChanged(IResourceDelta projectDelta) {
for(IPath path : ProjectRegistryManager.METADATA_PATH) {
IResourceDelta delta = projectDelta.findMember(path);
if(delta != null && isInterestingDelta(delta)) {
return true;
}
}
return false;
}
private void queue(MavenUpdateRequest updateRequest) {
synchronized(queue) {
queue.add(updateRequest);
log.debug("Queued refresh request: {}", updateRequest.toString()); //$NON-NLS-1$
}
}
public void preferenceChange(PreferenceChangeEvent event) {
boolean offline = mavenConfiguration.isOffline();
boolean updateSnapshots = false;
if (event.getSource() instanceof IProject) {
queue(new MavenUpdateRequest((IProject) event.getSource(), offline, updateSnapshots));
}
}
public boolean isEmpty() {
synchronized(queue) {
return queue.isEmpty();
}
}
protected boolean isInterestingDelta(IResourceDelta delta) {
return delta.getKind() == IResourceDelta.REMOVED
|| delta.getKind() == IResourceDelta.ADDED
|| (delta.getKind() == IResourceDelta.CHANGED && ((delta.getFlags() & DELTA_FLAGS) != 0));
}
}
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