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If multiple concurrent threads were creating vm://localhost connection, it was possible multiple "localhost" broker would be started. 

git-svn-id: https://svn.apache.org/repos/asf/incubator/activemq/trunk@388082 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Hiram R. Chirino 2006-03-23 07:24:28 +00:00
parent 47f2bb7cc2
commit 61fef743e8
2 changed files with 46 additions and 29 deletions
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26
activemq-core/src/main/java/org/apache/activemq/broker/BrokerRegistry.java
View File

@ -16,7 +16,7 @@
*/
package org.apache.activemq.broker;
import edu.emory.mathcs.backport.java.util.concurrent.ConcurrentHashMap;
import java.util.HashMap;
/**
*
@ -29,22 +29,30 @@ public class BrokerRegistry {
public static BrokerRegistry getInstance() {
return instance;
}
ConcurrentHashMap brokers = new ConcurrentHashMap();
private BrokerRegistry() {
}
private final Object mutex = new Object();
private final HashMap brokers = new HashMap();
public BrokerService lookup(String brokerName) {
return (BrokerService)brokers.get(brokerName);
synchronized(mutex) {
return (BrokerService)brokers.get(brokerName);
}
}
public void bind(String brokerName, BrokerService broker) {
brokers.put(brokerName, broker);
synchronized(mutex) {
brokers.put(brokerName, broker);
}
}
public void unbind(String brokerName) {
brokers.remove(brokerName);
synchronized(mutex) {
brokers.remove(brokerName);
}
}
public Object getRegistryMutext() {
return mutex;
}
}

49
activemq-core/src/main/java/org/apache/activemq/transport/vm/VMTransportFactory.java
View File

@ -86,29 +86,38 @@ public class VMTransportFactory extends TransportFactory{
VMTransportServer server=(VMTransportServer) servers.get(host);
// validate the broker is still active
if(!validateBroker(host)||server==null){
BrokerService broker=BrokerRegistry.getInstance().lookup(host);
if(broker==null){
try{
if(brokerFactoryHandler!=null){
broker=brokerFactoryHandler.createBroker(brokerURI);
}else{
broker=BrokerFactory.createBroker(brokerURI);
BrokerService broker=null;
// Synchronize on the registry so that multiple concurrent threads
// doing this do not think that the broker has not been created and cause multiple
// brokers to be started.
synchronized( BrokerRegistry.getInstance().getRegistryMutext() ) {
broker=BrokerRegistry.getInstance().lookup(host);
if(broker==null){
try{
if(brokerFactoryHandler!=null){
broker=brokerFactoryHandler.createBroker(brokerURI);
}else{
broker=BrokerFactory.createBroker(brokerURI);
}
broker.start();
}catch(URISyntaxException e){
throw IOExceptionSupport.create(e);
}
broker.start();
}catch(URISyntaxException e){
throw IOExceptionSupport.create(e);
brokers.put(host,broker);
}
brokers.put(host,broker);
server=(VMTransportServer) servers.get(host);
if(server==null){
server=(VMTransportServer) bind(location,true);
TransportConnector connector=new TransportConnector(broker.getBroker(),server);
connector.setTaskRunnerFactory( broker.getTaskRunnerFactory() );
connector.start();
connectors.put(host,connector);
}
}
server=(VMTransportServer) servers.get(host);
if(server==null){
server=(VMTransportServer) bind(location,true);
TransportConnector connector=new TransportConnector(broker.getBroker(),server);
connector.setTaskRunnerFactory( broker.getTaskRunnerFactory() );
connector.start();
connectors.put(host,connector);
}
}else{}
}
VMTransport vmtransport=server.connect();
IntrospectionSupport.setProperties(vmtransport,options);
Transport transport=vmtransport;