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/*******************************************************************************
* Copyright (c) 2000, 2006 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.team.internal.ccvs.core.syncinfo;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.team.core.TeamException;
import org.eclipse.team.internal.core.subscribers.BatchingLock;
/**
* Provides a per-thread nested locking mechanism. A thread can acquire a
* lock on a specific resource by calling acquire(). Subsequently, acquire() can be called
* multiple times on the resource or any of its children from within the same thread
* without blocking. Other threads that try
* and acquire the lock on those same resources will be blocked until the first
* thread releases all it's nested locks.
* <p>
* The locking is managed by the platform via scheduling rules. This class simply
* provides the nesting mechnism in order to allow the client to determine when
* the lock for the thread has been released. Therefore, this lock will block if
* another thread already locks the same resource.</p>
*/
public class ReentrantLock extends BatchingLock {
public class CVSThreadInfo extends ThreadInfo{
private Set changedFolders = new HashSet();
public CVSThreadInfo(IFlushOperation operation) {
super(operation);
}
public void addChangedFolder(IContainer container) {
changedFolders.add(container);
}
public boolean isEmpty() {
return changedFolders.isEmpty() && super.isEmpty();
}
public IContainer[] getChangedFolders() {
return (IContainer[]) changedFolders.toArray(new IContainer[changedFolders.size()]);
}
public void flush(IProgressMonitor monitor) throws TeamException {
try {
super.flush(monitor);
} finally {
// We have to clear the resources no matter what since the next attempt
// to flush may not have an appropriate scheduling rule
changedFolders.clear();
}
}
}
@Override
protected ThreadInfo createThreadInfo(IFlushOperation operation) {
return new CVSThreadInfo(operation);
}
public void folderChanged(IContainer folder) {
CVSThreadInfo info = (CVSThreadInfo)getThreadInfo();
Assert.isNotNull(info, "Folder changed outside of resource lock"); //$NON-NLS-1$
info.addChangedFolder(folder);
}
}
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