001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041:
042: package org.netbeans.modules.cnd.repository.util;
043:
044: import java.util.concurrent.locks.ReadWriteLock;
045: import java.util.concurrent.locks.ReentrantReadWriteLock;
046: import org.netbeans.modules.cnd.repository.api.RepositoryException;
047: import org.netbeans.modules.cnd.repository.spi.RepositoryListener;
048:
049: /**
050: *
051: * @author Nickolay Dalmatov
052: */
053: public class RepositoryListenersManager {
054: private static final RepositoryListenersManager instance = new RepositoryListenersManager();
055: private RepositoryListener theListener = null;
056: private final ReadWriteLock rwLock = new ReentrantReadWriteLock();
057:
058: /** Creates a new instance of RepositoryListenersManager */
059: private RepositoryListenersManager() {
060: }
061:
062: public static RepositoryListenersManager getInstance() {
063: return instance;
064: }
065:
066: public void registerListener(final RepositoryListener listener) {
067: try {
068: rwLock.writeLock().lock();
069: theListener = listener;
070: } finally {
071: rwLock.writeLock().unlock();
072: }
073: }
074:
075: public void unregisterListener(final RepositoryListener listener) {
076: try {
077: rwLock.writeLock().lock();
078: theListener = null;
079: } finally {
080: rwLock.writeLock().unlock();
081: }
082: }
083:
084: public boolean fireUnitOpenedEvent(final String unitName) {
085: boolean toOpen = true;
086: try {
087: rwLock.readLock().lock();
088: if (theListener != null) {
089: toOpen = theListener.unitOpened(unitName);
090: }
091: } finally {
092: rwLock.readLock().unlock();
093: }
094:
095: return toOpen;
096: }
097:
098: public void fireUnitClosedEvent(final String unitName) {
099: try {
100: rwLock.readLock().lock();
101: if (theListener != null) {
102: theListener.unitClosed(unitName);
103: }
104: } finally {
105: rwLock.readLock().unlock();
106: }
107: }
108:
109: public void fireAnException(final String unitName,
110: final RepositoryException exception) {
111: try {
112: rwLock.readLock().lock();
113: if (theListener != null) {
114: theListener.anExceptionHappened(unitName, exception);
115: } else {
116: if (exception.getCause() != null) {
117: exception.getCause().printStackTrace(System.err);
118: }
119: }
120: } finally {
121: rwLock.readLock().unlock();
122: }
123: }
124: }
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