org.glassfish.gms.bootstrap.GmsAdapterService Maven / Gradle / Ivy
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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.config.serverbeans.Domain;
import com.sun.enterprise.ee.cms.core.GMSConstants;
import com.sun.enterprise.ee.cms.core.GroupManagementService;
import com.sun.logging.LogDomains;
import java.beans.PropertyChangeEvent;
import java.util.LinkedList;
import java.util.List;
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.*;
import java.beans.PropertyChangeListener;
/**
* 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);
@Inject
Clusters clusters;
@Inject(name=ServerEnvironment.DEFAULT_INSTANCE_NAME)
Server server;
@Inject
ServerEnvironment env;
@Inject
Habitat habitat;
/* TODO:
* For M2, there is just the one cluster so we'll have only
* one GMSAdapter. Going forward, we want one adapter created
* for each cluster (in the DAS).
*/
GMSAdapter gmsAdapter;
/**
* 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;
}
private List gmsEnabledClusters = new LinkedList();
/**
* Starts the application loader service.
*
* Look at the list of existing clusters. Stop after finding the
* first gms-enabled cluster.
*
* todo: in instance, only check *my* cluster (if I'm part of
* a cluster)
*/
@Override
public void postConstruct() {
if (clusters != null) {
if (server.isDas()) {
checkAllClusters(clusters);
} else {
checkCurrentCluster(clusters);
}
}
}
@Override
public String toString() {
return "GMS Loader";
}
/* TODO:
* In instance case, there is only the one adapter. In the DAS,
* do we want multiple instances of GMSAdapter and each one has
* only the single getModule() method?
*/
public GMSAdapter getGMSAdapter() {
return gmsAdapter;
}
public boolean isGmsEnabled() {
return gmsAdapter != null;
}
/* TODO:
*/
public GMSAdapter getGMSAdapterByName(String clusterName) {
return gmsAdapter;
}
/* TODO:
* Create a GMSAdapter for each cluster that has gms enabled.
*/
private void checkAllClusters(Clusters clusters) {
logger.fine("In DAS. Checking all clusters.");
for (Cluster cluster : clusters.getCluster()) {
String gmsEnString = cluster.getGmsEnabled();
if (logger.isLoggable(Level.FINE)) {
logger.fine(String.format(
"cluster %s found with gms-enabled='%s'",
cluster.getName(), gmsEnString));
}
if (gmsEnString != null && Boolean.parseBoolean(gmsEnString)) {
gmsEnabledClusters.add(cluster.getName());
loadModule(cluster);
}
}
}
/* TODO:
* Need to find only the cluster to which this instance belongs
* and check to see if gms is enabled.
*/
private void checkCurrentCluster(Clusters clusters) {
logger.fine("In instance. Looking for current cluster.");
for (Cluster cluster : clusters.getCluster()) {
String gmsEnString = cluster.getGmsEnabled();
if (logger.isLoggable(Level.FINE)) {
logger.fine(String.format(
"cluster %s found with gms-enabled='%s'",
cluster.getName(), gmsEnString));
}
if (gmsEnString != null && Boolean.parseBoolean(gmsEnString)) {
loadModule(cluster);
break;
}
}
}
/*
* TODO: in case of multiple clusters, we want an instance
* of GMSAdapter for each group. The cluster param is more
* of a placeholder. May only need a name to use for group here.
*/
private void loadModule(Cluster cluster) {
// getting the service from the habitat is enough to load it
gmsAdapter = habitat.getByContract(GMSAdapter.class);
}
// DAS should join gms group when a cluster is created.
@Override
public UnprocessedChangeEvents changed(PropertyChangeEvent[] events) {
if (env.isDas()) {
return ConfigSupport.sortAndDispatch(events, new Changed() {
@Override
public NotProcessed changed(TYPE type, Class changedType, T changedInstance) {
if (changedType == Cluster.class && type == TYPE.ADD) { //create-cluster
Cluster cluster = (Cluster) changedInstance;
if (logger.isLoggable(Level.FINE)) {
logger.fine("ClusterChangeEvent add clustername=" + cluster.getName());
}
if (Boolean.valueOf(cluster.getGmsEnabled()) && !gmsEnabledClusters.contains(cluster.getName())) {
gmsEnabledClusters.add(cluster.getName());
loadModule(cluster);
gmsAdapter.getModule().reportJoinedAndReadyState(cluster.getName());
}
// todo: when supporting multiple clusters, ensure that newly added cluster has a different gms-multicast-address than all existing clusters.
// if not and the multicast-address was defaulted, generate a unique one. (this is how it worked in v2)
}
if (changedType == Cluster.class && type == TYPE.REMOVE) { //remove-cluster
Cluster cluster = (Cluster) changedInstance;
if (Boolean.valueOf(cluster.getGmsEnabled()) && gmsEnabledClusters.contains(cluster.getName())) {
gmsEnabledClusters.remove(cluster.getName());
// following only needed when gmsAdapter is a Singleton scope, when we support multiple clusters, there should
// be a lookup here of gmsAdapter by its clustername and that should be shutdown.
// for now, just ensure if gmsAdapter is removed cluster, just shut it down.
if (cluster.getName().compareTo(gmsAdapter.getModule().getGroupName()) == 0) {
gmsAdapter.getModule().shutdown(GMSConstants.shutdownType.INSTANCE_SHUTDOWN);
gmsAdapter = null;
}
}
}
return null;
}
}, logger);
}
return null;
}
}
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