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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2009-2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
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* exception as provided by Oracle in the GPL Version 2 section of the License
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*
* Modifications:
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*/
package org.glassfish.kernel;
import org.glassfish.api.event.EventTypes;
import org.glassfish.api.event.Events;
import org.jvnet.hk2.annotations.Service;
import javax.inject.Inject;
import org.glassfish.hk2.api.PostConstruct;
import org.glassfish.api.admin.FileMonitoring;
import java.io.File;
import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
/**
* @author Jerome Dochez
*/
@Service
public class FileMonitoringImpl implements FileMonitoring, PostConstruct {
@Inject
ExecutorService executor;
@Inject
ScheduledExecutorService scheduledExecutor;
@Inject
Events events;
final Map> listeners = new HashMap>();
final Map monitored = new HashMap();
public void postConstruct() {
final ScheduledFuture future = scheduledExecutor.scheduleWithFixedDelay(new Runnable() {
public void run() {
if (monitored.isEmpty()) {
return;
}
// check our list of monitored files for any changes
Set monitoredFiles = new HashSet();
monitoredFiles.addAll(listeners.keySet());
for (File file : monitoredFiles) {
if (!file.exists()) {
removed(file);
listeners.remove(file);
monitored.remove(file);
} else
if (file.lastModified()!=monitored.get(file)) {
// file has changed
monitored.put(file, file.lastModified());
changed(file);
}
}
}
}, 0, 500, TimeUnit.MILLISECONDS);
events.register(new org.glassfish.api.event.EventListener() {
@Override
public void event(Event event) {
if (event.is(EventTypes.PREPARE_SHUTDOWN)) {
System.out.println("FileMonitoring shutdown");
future.cancel(false);
}
}
});
}
public synchronized void monitors(File file, FileChangeListener listener) {
if (monitored.containsKey(file)) {
listeners.get(file).add(listener);
} else {
List list = new ArrayList();
list.add(listener);
listeners.put(file, list);
monitored.put(file, file.lastModified());
}
}
public synchronized void fileModified(File file) {
monitored.put(file, 0L);
}
private void removed(final File file) {
for (final FileChangeListener listener : listeners.get(file)) {
executor.submit(new Runnable() {
public void run() {
listener.deleted(file);
}
});
}
}
private void changed(final File file) {
for (final FileChangeListener listener : listeners.get(file)) {
executor.submit(new Runnable() {
public void run() {
listener.changed(file);
}
});
}
}
}