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/*
* ClusterHealthChecker.java
*
* Created on August 5, 2005, 12:48 AM
*/
package com.sun.enterprise.ee.admin.mbeans;
import com.sun.enterprise.admin.common.MBeanServerFactory;
import com.sun.enterprise.admin.servermgmt.InstanceException;
import com.sun.enterprise.admin.servermgmt.RuntimeStatus;
import com.sun.enterprise.admin.servermgmt.RuntimeStatusList;
import com.sun.enterprise.config.ConfigContext;
import com.sun.enterprise.config.serverbeans.Cluster;
import com.sun.enterprise.config.serverbeans.ClusterHelper;
import com.sun.enterprise.util.i18n.StringManager;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
/**
*/
public class ClusterHealthChecker implements ClusterHealthCheckerMBean {
private final ConfigContext acc;
private static final StringManager sm = StringManager.getManager(ClusterHealthChecker.class);
public ClusterHealthChecker(final ConfigContext acc) {
this.acc = acc;
}
/** Returns the health of the cluster as a particular data structure. Here are the details of the data structure:
* <ul>
* <li> It is a map with entries keyed on the name of server instance in the cluster.</li>
* <li> The values in the Map is a list of 2 Long numbers.</li>
* <li> The first Long number in the list is the actual status of the instance. </li>
* <ul>
* <li> 0 ==> Running </li>
* <li> 1 ==> Stopped </li>
* <li> 2 ==> Failed <code> available only when GMS is enabled </code> </li>
* <li> 3 ==> Not Yet Started <code> available only when GMS is enabled</li>
* </ul>
* <li> The second Long number in the list is the time (as a long) for which that instance is in the said state.
* This is available only when GMS is enabled. If GMS is not enabled, then -1 is returned.</li>
* </ul>
* @throws InstanceException if there is anything wrong with getting the health data
* @param targetCluster a String representing the name of the cluster
*/
public Map<String, List<Long>> getClusterHealth(String targetCluster) throws InstanceException {
if (targetCluster == null)
throw new IllegalArgumentException("null_arg");
try {
if (!ClusterHelper.isACluster(acc, targetCluster)) {
throw new InstanceException(sm.getString("noSuchCluster", targetCluster));
}
} catch (final Exception e) {
throw new InstanceException(e);
}
Map<String, List<Long>> health = null;
if (gmsEnabled(targetCluster)) {
health = getHealthFromGMS(targetCluster);
}
else {
health = getHealthFromJMX(targetCluster);
}
return ( health );
}
private boolean gmsEnabled(final String cn) throws InstanceException {
try {
final Cluster cluster = ClusterHelper.getClusterByName(acc, cn);
final boolean gms = cluster.isHeartbeatEnabled();
return ( gms );
} catch(final Exception e) {
throw new InstanceException(e);
}
}
private Map<String, List<Long>> getHealthFromGMS(final String cluster) throws InstanceException {
Map<String, List<Long>> health = null;
try {
final ObjectName on = EEConfigMBeanObjectNames.getGMSClientObjName();
final MBeanServerConnection mbsc = MBeanServerFactory.getMBeanServer();
final String m = "getClusterHealth";
final Object[] p = new String[]{cluster};
final String[] s = new String[]{"java.lang.String"};
health = (Map<String, List<Long>>) mbsc.invoke(on, m, p, s);
return ( health );
} catch(final Exception e) {
throw new InstanceException(e);
}
}
private Map<String, List<Long>> getHealthFromJMX(final String cluster) throws InstanceException {
try {
final RuntimeStatusList list = invokeClusterMBeanForStatus(cluster);
final Map<String, List<Long>> map = statusList2Map(list);
return ( map );
} catch(final Exception e) {
throw new InstanceException(e);
}
}
private RuntimeStatusList invokeClusterMBeanForStatus(final String cluster) throws Exception {
final ObjectName on = EEConfigMBeanObjectNames.getClusterConfigMBeanObjectName(cluster);
final MBeanServerConnection mbsc = MBeanServerFactory.getMBeanServer();
final String m = "getRuntimeStatus";
final RuntimeStatusList l = (RuntimeStatusList) mbsc.invoke(on, m, null, null);
return ( l );
}
private Map<String, List<Long>> statusList2Map(final RuntimeStatusList list) throws Exception {
final Map<String, List<Long>> map = new HashMap<String, List<Long>> ();
int i = 0;
for (final Object o : list) {
final RuntimeStatus rs = list.getStatus(i);
final String name = rs.getName();
map.put(name, convert(rs));
i++;
}
return ( map );
}
private List<Long> convert(final RuntimeStatus rs) {
final List<Long> list = new ArrayList<Long> ();
Long s = -1L;
final Long undefinedTime = new Long(-1);
if (rs.isRunning())
s = 0L;
if (rs.isStopped())
s = 1L;
list.add(s);
list.add(undefinedTime);
return ( list );
}
}