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package com.sun.messaging.jmq.jmsserver.cluster.manager.ha;
import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
import com.sun.messaging.jmq.io.MQAddress;
import com.sun.messaging.jmq.util.log.Logger;
import com.sun.messaging.jmq.jmsserver.Globals;
import com.sun.messaging.jmq.jmsserver.util.BrokerException;
import com.sun.messaging.jmq.jmsserver.persist.api.HABrokerInfo;
import com.sun.messaging.jmq.jmsserver.cluster.api.BrokerState;
import com.sun.messaging.jmq.jmsserver.cluster.api.ClusteredBroker;
import com.sun.messaging.jmq.jmsserver.cluster.api.ClusterManager;
import com.sun.messaging.jmq.jmsserver.cluster.api.ha.HAClusteredBroker;
import com.sun.messaging.jmq.jmsserver.cluster.manager.ClusterReason;
import com.sun.messaging.jmq.jmsserver.cluster.manager.AutoClusterBrokerMap;
import com.sun.messaging.jmq.jmsserver.resources.BrokerResources;
/**
* we need to verify the list of brokers in the following situations:
* - a broker is added
* - a broker is removed (does NOT update database)
* - the first time a broker is started
*
* A subclass of Map which knows how to populate itself from the jdbc store.
*/
public class JDBCHABrokerInfoMap extends HashMap implements Map, AutoClusterBrokerMap
{
HAClusterManagerImpl parent = null;
/**
* Create an instance of HAMap.
* @throws BrokerException if something goes wrong loading the
* jdbc store.
*/
public JDBCHABrokerInfoMap(HAClusterManagerImpl manager)
throws BrokerException {
init(manager, null);
}
public void init(ClusterManager mgr, MQAddress addr)
throws BrokerException {
this.parent = (HAClusterManagerImpl)mgr;
// OK, load everything in the store that is OPERATING
Map map = Globals.getStore().getAllBrokerInfos();
Iterator itr = map.entrySet().iterator();
while (itr.hasNext()) {
Map.Entry entry = (Map.Entry)itr.next();
String key = (String)entry.getKey();
HABrokerInfo bi = (HABrokerInfo)entry.getValue();
HAClusteredBroker cb = new HAClusteredBrokerImpl(bi.getId(), bi, parent);
put(key,cb);
parent.brokerChanged(ClusterReason.ADDED, cb.getBrokerName(),
null, cb, cb.getBrokerSessionUID(), null);
}
}
/**
* Method which reloads the contents of this map from the
* current information in the JDBC store.
* @throws BrokerException if something goes wrong loading the
* jdbc store.
*/
public void updateMap()
throws BrokerException
{
updateMap(false);
}
public void updateMap(boolean all)
throws BrokerException
{
if (all) {
updateHAMapForState(null);
} else {
updateHAMapForState(BrokerState.OPERATING);
}
}
private void updateHAMapForState(BrokerState state)
throws BrokerException
{
// OK, load everything in the store that is the right state
Map map;
if (state == null) {
// Load everything if state is not specified
map = Globals.getStore().getAllBrokerInfos();
} else {
map = Globals.getStore().getAllBrokerInfoByState(state);
}
Iterator itr = map.entrySet().iterator();
while (itr.hasNext()) {
Map.Entry entry = (Map.Entry)itr.next();
String key = (String)entry.getKey();
HABrokerInfo bi = (HABrokerInfo)entry.getValue();
HAClusteredBrokerImpl impl = (HAClusteredBrokerImpl)get(key);
if (impl == null) {
HAClusteredBroker cb =
new HAClusteredBrokerImpl(bi.getId(), bi, parent);
put(key,cb);
parent.brokerChanged(ClusterReason.ADDED, cb.getBrokerName(),
null, cb, cb.getBrokerSessionUID(), null);
} else { // update
// already exists
impl.update(bi);
}
}
// Sanity check when do load everything from the DB; remove from
// memory if any broker has been removed from the broker table
if (state == null) {
itr = entrySet().iterator();
while (itr.hasNext()) {
Map.Entry entry = (Map.Entry)itr.next();
String key = (String)entry.getKey();
if (!map.containsKey(key)) {
itr.remove();
HAClusteredBrokerImpl impl = (HAClusteredBrokerImpl)entry.getValue();
parent.brokerChanged(ClusterReason.REMOVED, impl.getBrokerName(),
impl, null, impl.getBrokerSessionUID(), null);
}
}
}
}
/**
* Retrieves the HAClusteredBroker associated with the passed in
* broker id.
* If the id is not found in the hashtable, the database will be
* checked.
* @param key the brokerid to lookup
* @return the HAClusteredBroker object (or null if one can't be found)
*/
public Object get(Object key) {
return get(key, false);
}
/**
* Retrieves the HAClusteredBroker associated with the passed in
* broker id.
* If the id is not found in the hashtable, the database will be
* checked.
* @param key the brokerid to lookup
* @param update update against store
* @return the HAClusteredBroker object (or null if one can't be found)
*/
public Object get(Object key, boolean update) {
Object o = super.get(key);
if (o == null || update) {
try {
HABrokerInfo m= Globals.getStore().getBrokerInfo((String)key);
if (m != null && o == null) {
HAClusteredBroker cb = new HAClusteredBrokerImpl((String)key, m, parent);
put(key,cb);
parent.brokerChanged(ClusterReason.ADDED, cb.getBrokerName(),
null, cb, cb.getBrokerSessionUID(), null);
o = cb;
}
if (m != null && update) {
((HAClusteredBrokerImpl)o).update(m);
}
} catch (BrokerException ex) {
Globals.getLogger().logStack(Logger.WARNING,
"Exception while creating broker entry " + key , ex);
}
}
return o;
}
}
