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/*******************************************************************************
* Copyright (c)2010 REMAIN B.V. The Netherlands. (http://www.remainsoftware.com).
* 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:
* Wim Jongman - initial API and implementation
* Ahmed Aadel - initial API and implementation
*******************************************************************************/
package org.eclipse.ecf.provider.zookeeper.node.internal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.zookeeper.ZooKeeper;
import org.eclipse.core.runtime.Assert;
import org.eclipse.ecf.discovery.IServiceInfo;
import org.eclipse.ecf.provider.zookeeper.DiscoveryActivator;
import org.eclipse.ecf.provider.zookeeper.core.AdvertisedService;
import org.eclipse.ecf.provider.zookeeper.core.ZooDiscoveryContainer;
import org.eclipse.ecf.provider.zookeeper.core.internal.BundleStoppingListener;
import org.eclipse.ecf.provider.zookeeper.core.internal.Configuration;
import org.eclipse.ecf.provider.zookeeper.util.Geo;
import org.eclipse.ecf.provider.zookeeper.util.Logger;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceReference;
import org.osgi.service.log.LogService;
public class WatchManager implements BundleStoppingListener {
private List<ZooKeeper> zooKeepers;
private Map<String, NodeWriter> nodeWriters;
private Map<String, IServiceInfo> allKnownServices;
private Configuration config;
private WriteRoot writeRoot;
private Lock writeRootLock;
private boolean isDisposed;
public WatchManager(Configuration config) {
this.config = config;
DiscoveryActivator.registerBundleStoppingListner(this);
zooKeepers = new ArrayList<ZooKeeper>();
nodeWriters = new HashMap<String, NodeWriter>();
allKnownServices = new HashMap<String, IServiceInfo>();
writeRootLock = new Lock().lock();
isDisposed = false;
}
public synchronized void publish(final ServiceReference ref) {
Assert.isNotNull(ref);
String serviceid = ref.getProperty(Constants.SERVICE_ID).toString();
if (WatchManager.this.getNodeWriters().containsKey(serviceid))
return;
if (!WatchManager.this.writeRootLock.isOpen()) {
synchronized (WatchManager.this.writeRootLock) {
try {
/* wait for the server to get ready */
WatchManager.this.writeRootLock.wait();
} catch (InterruptedException e) {
Logger.log(LogService.LOG_DEBUG, e.getMessage(), e);
}
}
}
AdvertisedService published = new AdvertisedService(ref);
allKnownServices.put(published.getServiceID().getName(), published);
NodeWriter nodeWriter = new NodeWriter(published,
WatchManager.this.writeRoot);
WatchManager.this.getNodeWriters().put(serviceid, nodeWriter);
nodeWriter.publish();
}
public synchronized void publish(final AdvertisedService published) {
Assert.isNotNull(published);
String serviceid = published.getServiceID().getServiceTypeID()
.getInternal();
if (WatchManager.this.getNodeWriters().containsKey(serviceid))
return;
if (!WatchManager.this.writeRootLock.isOpen()) {
synchronized (WatchManager.this.writeRootLock) {
try {
/* wait for the server to get ready */
WatchManager.this.writeRootLock.wait();
} catch (InterruptedException e) {
Logger.log(LogService.LOG_DEBUG, e.getMessage(), e);
}
}
}
NodeWriter nodeWriter = new NodeWriter(published,
WatchManager.this.writeRoot);
WatchManager.this.getNodeWriters().put(serviceid, nodeWriter);
allKnownServices.put(published.getServiceID().getName(), published);
nodeWriter.publish();
}
public synchronized void unpublish(final String id) {
Assert.isNotNull(id);
IServiceInfo p = AdvertisedService.removePublished(id);
if (p == null) {
return;
}
NodeWriter nw = getNodeWriters().remove(id);
allKnownServices.remove(nw.getNode().getWrappedService().getServiceID()
.getName());
if (nw != null) {
nw.remove();
}
nw = null;
}
public synchronized void update(ServiceReference ref) {
Assert.isNotNull(ref);
unpublish((String) ref.getProperty(Constants.SERVICE_ID).toString());
publish(ref);
}
public void watch() {
switch (getConfig().getFlavor()) {
case CENTRALIZED:
ZooDiscoveryContainer.CACHED_THREAD_POOL.execute(new Runnable() {
public void run() {
WatchManager.this.writeRoot = new WriteRoot(getConfig()
.getServerIps(), WatchManager.this);
synchronized (WatchManager.this.writeRootLock) {
WatchManager.this.writeRootLock.unlock();
WatchManager.this.writeRootLock.notifyAll();
}
}
});
ZooDiscoveryContainer.CACHED_THREAD_POOL.execute(new Runnable() {
public void run() {
new ReadRoot(getConfig().getServerIps(), WatchManager.this);
}
});
break;
case REPLICATED:
ZooDiscoveryContainer.CACHED_THREAD_POOL.execute(new Runnable() {
public void run() {
WatchManager.this.writeRoot = new WriteRoot(getConfig()
.getServerIps(), WatchManager.this);
synchronized (WatchManager.this.writeRootLock) {
WatchManager.this.writeRootLock.unlock();
WatchManager.this.writeRootLock.notifyAll();
}
}
});
ZooDiscoveryContainer.CACHED_THREAD_POOL.execute(new Runnable() {
public void run() {
new ReadRoot(getConfig().getServerIps(), WatchManager.this);
}
});
break;
case STANDALONE:
ZooDiscoveryContainer.CACHED_THREAD_POOL.execute(new Runnable() {
public void run() {
WatchManager.this.writeRoot = new WriteRoot(Geo.getHost(),
WatchManager.this);
if (!WatchManager.this.writeRoot.isConnected()) {
synchronized (WatchManager.this.writeRoot) {
try {
/*
* wait for connection with the server to write
* to.
*/
WatchManager.this.writeRoot.wait();
} catch (InterruptedException e) {
Logger.log(LogService.LOG_DEBUG,
e.getMessage(), e);
}
}
}
synchronized (WatchManager.this.writeRootLock) {
/* resume publication */
WatchManager.this.writeRootLock.unlock();
WatchManager.this.writeRootLock.notifyAll();
}
}
});
ZooDiscoveryContainer.CACHED_THREAD_POOL.execute(new Runnable() {
public void run() {
for (String ip : getConfig().getServerIps().split(",")) { //$NON-NLS-1$
new ReadRoot(ip, WatchManager.this);
}
}
});
break;
}
}
public void bundleStopping() {
this.dispose();
}
public void dispose() {
try {
isDisposed = true;
unpublishAll();
if (!this.getNodeWriters().isEmpty()) {
Set<NodeWriter> copy = new HashSet<NodeWriter>();
copy.addAll(this.getNodeWriters().values());
for (NodeWriter nw : copy) {
if (nw.getNode().isLocalNode())
nw.remove();
}
copy.clear();
}
for (ZooKeeper zk : this.zooKeepers) {
if (zk != null)
zk.close();
}
if (this.zooKeepers != null)
this.zooKeepers.clear();
if (this.allKnownServices != null)
this.allKnownServices.clear();
} catch (Throwable e) {
// Ignore. We're already down at this point.
}
}
public void setConfig(Configuration config) {
this.config = config;
}
public Configuration getConfig() {
return this.config;
}
public void addZooKeeper(ZooKeeper zooKeeper) {
Assert.isNotNull(zooKeeper);
this.zooKeepers.add(zooKeeper);
}
public void removeZooKeeper(ZooKeeper zooKeeper) {
this.zooKeepers.remove(zooKeeper);
}
public WriteRoot getWriteRoot() {
return this.writeRoot;
}
public Map<String, NodeWriter> getNodeWriters() {
return this.nodeWriters;
}
private class Lock {
boolean state;
boolean isOpen() {
return this.state;
}
Lock unlock() {
this.state = true;
return this;
}
Lock lock() {
this.state = false;
return this;
}
}
public void unpublishAll() {
for (NodeWriter nw : getNodeWriters().values()) {
nw.remove();
allKnownServices.remove(nw.getNode().getWrappedService()
.getServiceID().getName());
}
}
public void republishAll() {
NodeWriter nws[] = getNodeWriters().values().toArray(
new NodeWriter[getNodeWriters().size()]);
for (int i = 0; i < nws.length; i++) {
nws[i].getNode().regenerateNodeId();
nws[i].publish();
allKnownServices.put(nws[i].getNode().getWrappedService()
.getServiceID().getName(), nws[i].getNode()
.getWrappedService());
}
}
public Map<String, IServiceInfo> getAllKnownServices() {
return allKnownServices;
}
public boolean isDisposed() {
return this.isDisposed;
}
}
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