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Glassfish example source code file (GMSAdapterService.java)
This example Glassfish source code file (GMSAdapterService.java) is included in the DevDaily.com
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The Glassfish GMSAdapterService.java source code
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2010 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:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
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* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
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package org.glassfish.gms.bootstrap;
import com.sun.enterprise.config.serverbeans.Cluster;
import com.sun.enterprise.config.serverbeans.Clusters;
import com.sun.enterprise.config.serverbeans.Server;
import com.sun.enterprise.ee.cms.core.GMSConstants;
import com.sun.enterprise.ee.cms.core.GroupManagementService;
import com.sun.enterprise.module.bootstrap.StartupContext;
import com.sun.enterprise.util.i18n.StringManager;
import com.sun.hk2.component.ExistingSingletonInhabitant;
import com.sun.logging.LogDomains;
import java.beans.PropertyChangeEvent;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.api.Startup;
import org.glassfish.api.admin.ServerEnvironment;
import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.component.Habitat;
import org.jvnet.hk2.component.PostConstruct;
import org.jvnet.hk2.config.*;
/**
* This service is responsible for loading the group management
* service. In the DAS, GMS will only be enabled if there is at least
* one cluster present with the gms-enabled attribute set to true.
* In an instance, GMS will be enabled if the cluster containing this
* instance has gms-enabled set to true.
*
* Components can inject this service in order to obtain a reference
* to a GMSAdapter object. From this, the appropriate GroupManagementService
* object can be retrieved.
*/
@Service()
public class GMSAdapterService implements Startup, PostConstruct, ConfigListener {
final static Logger logger = LogDomains.getLogger(
GMSAdapterService.class, LogDomains.CORE_LOGGER);
private static final StringManager strings =
StringManager.getManager(GMSAdapterService.class);
@Inject
Clusters clusters;
@Inject(name=ServerEnvironment.DEFAULT_INSTANCE_NAME)
Server server;
@Inject
ServerEnvironment env;
@Inject
Habitat habitat;
@Inject
StartupContext startupContext;
static private final Object lock = new Object();
List<GMSAdapter> gmsAdapters = new LinkedList();
final static private Level TRACE_LEVEL = Level.FINE;
/**
* Returns the lifecyle of the service. This service may not be needed
* after startup -- we still need to determine how to load GMS when
* a gms-enabled cluster is first created during runtime.
* TODO: determine SERVER v START
*/
@Override
public Startup.Lifecycle getLifecycle() {
return Startup.Lifecycle.SERVER;
}
/**
* Starts the application loader service.
*/
@Override
public void postConstruct() {
if (startupContext != null) {
Properties args = startupContext.getArguments();
if (args != null && Boolean.valueOf(args.getProperty("-upgrade"))) {
return;
}
}
if (clusters != null) {
if (env.isDas()) {
checkAllClusters(clusters);
} else {
Cluster cluster = server.getCluster();
if (cluster != null) {
checkCluster(cluster);
}
}
}
}
@Override
public String toString() {
return "GMS Loader";
}
/*
*/
public GMSAdapter getGMSAdapter() {
synchronized(lock) {
if (gmsAdapters.size() > 1) {
throw new IllegalStateException(
strings.getString("use.getByName"));
} else if (gmsAdapters.size() == 1) {
return gmsAdapters.get(0);
} else {
return null;
}
}
}
public boolean isGmsEnabled() {
return gmsAdapters.size() > 0;
}
public GMSAdapter getGMSAdapterByName(String clusterName) {
synchronized(lock) {
return habitat.getComponent(GMSAdapter.class, clusterName);
}
}
/**
* Create a GMSAdapter for each cluster that has gms enabled.
*/
private void checkAllClusters(Clusters clusters) {
if (logger.isLoggable(TRACE_LEVEL)) {
logger.log(TRACE_LEVEL, "In DAS. Checking all clusters.");
}
for (Cluster cluster : clusters.getCluster()) {
checkCluster(cluster);
}
}
private GMSAdapter checkCluster(Cluster cluster) {
GMSAdapter result = null;
String gmsEnString = cluster.getGmsEnabled();
if (logger.isLoggable(TRACE_LEVEL)) {
logger.log(TRACE_LEVEL, String.format("cluster %s found with gms-enabled='%s'",
cluster.getName(), gmsEnString));
}
if (gmsEnString != null && Boolean.parseBoolean(gmsEnString)) {
result = loadModule(cluster);
}
return result;
}
/*
* initial support for multiple clusters in DAS. a clustered instance can only belong to one cluster.
*/
private GMSAdapter loadModule(Cluster cluster) {
GMSAdapter result = null;
synchronized(lock) {
result = getGMSAdapterByName(cluster.getName());
if (logger.isLoggable(TRACE_LEVEL)) {
logger.log(TRACE_LEVEL, "lookup GMSAdapter by clusterName=" + cluster.getName() + " returned " + result);
}
if (result == null) {
if (logger.isLoggable(TRACE_LEVEL)) {
logger.log(TRACE_LEVEL, "creating gms-adapter for clustername " + cluster.getName() + " since no gms adapter found for clustername " + cluster.getName());
}
result = habitat.getByContract(GMSAdapter.class);
// see https://glassfish.dev.java.net/issues/show_bug.cgi?id=12850
if (result == null) {
logger.log(Level.WARNING, "gmsadapter.not.available");
return null;
}
boolean initResult = result.initialize(cluster.getName());
if (initResult == false) {
return null;
}
habitat.addIndex(new ExistingSingletonInhabitant<GMSAdapter>(result), GMSAdapter.class.getName(), cluster.getName());
if (logger.isLoggable(TRACE_LEVEL)) {
logger.log(TRACE_LEVEL, "loadModule: registered created gmsadapter for cluster " + cluster.getName() + " initialized result=" + initResult);
}
gmsAdapters.add(result);
}
}
return result;
}
/*
* On create-cluster event, DAS joins a gms-enabled cluster.
* On delete-cluster event, DAS leaves a gms-enabled cluster.
*/
@Override
public UnprocessedChangeEvents changed(PropertyChangeEvent[] events) {
if (env.isDas()) {
return ConfigSupport.sortAndDispatch(events, new Changed() {
@Override
public <T extends ConfigBeanProxy> NotProcessed changed(TYPE type, Class changedType, T changedInstance) {
if (changedType == Cluster.class && type == TYPE.ADD) { //create-cluster
Cluster cluster = (Cluster) changedInstance;
if (logger.isLoggable(TRACE_LEVEL)) {
logger.log(TRACE_LEVEL, "ClusterChangeEvent add cluster " + cluster.getName());
}
GMSAdapter localGmsAdapter = checkCluster(cluster);
if (localGmsAdapter != null) {
GroupManagementService gms = localGmsAdapter.getModule();
if (gms != null) {
gms.reportJoinedAndReadyState();
}
}
// todo: when supporting multiple clusters, ensure that newly added cluster has a different gms-multicast-address than all existing clusters.
// currently, generating a unique multicast address depending on random so this check is necessary.
}
if (changedType == Cluster.class && type == TYPE.REMOVE) { //remove-cluster
Cluster cluster = (Cluster) changedInstance;
if (logger.isLoggable(TRACE_LEVEL)) {
logger.log(TRACE_LEVEL, "ClusterChangeEvent remove cluster " + cluster.getName());
}
synchronized(lock) {
GMSAdapter localGmsAdapter = getGMSAdapterByName(cluster.getName());
if (localGmsAdapter != null) {
gmsAdapters.remove(localGmsAdapter);
localGmsAdapter.getModule().shutdown(GMSConstants.shutdownType.INSTANCE_SHUTDOWN);
boolean result = habitat.removeIndex(GMSAdapter.class.getName(), localGmsAdapter);
if (logger.isLoggable(TRACE_LEVEL)) {
logger.log(TRACE_LEVEL, "removeIndex(" + GMSAdapter.class.getName() + ") returned result of " + result);
}
// remove GMS module for deleted cluster. Must do this or will fail if the cluster is recreated before DAS is stopped.
localGmsAdapter.complete();
}
}
}
return null;
}
}, logger);
}
return null;
}
}
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