/**
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.openejb.resource;
import org.apache.geronimo.connector.outbound.ConnectionInfo;
import org.apache.geronimo.connector.outbound.ConnectionReturnAction;
import org.apache.geronimo.connector.outbound.ConnectionTrackingInterceptor;
import org.apache.geronimo.connector.outbound.ManagedConnectionInfo;
import org.apache.geronimo.connector.outbound.connectiontracking.ConnectionTracker;
import javax.resource.ResourceException;
import javax.resource.spi.DissociatableManagedConnection;
import java.lang.ref.PhantomReference;
import java.lang.ref.ReferenceQueue;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
public class AutoConnectionTracker implements ConnectionTracker {
private final ConcurrentMap<ManagedConnectionInfo, ProxyPhantomReference> references = new ConcurrentHashMap<ManagedConnectionInfo,ProxyPhantomReference>();
private final ReferenceQueue referenceQueue = new ReferenceQueue();
/**
* Releases any managed connections held by a garbage collected connection proxy.
* @param connectionInfo the connection to be obtained
* @param key the unique id of the connection manager
*/
public void setEnvironment(ConnectionInfo connectionInfo, String key) {
ProxyPhantomReference reference = (ProxyPhantomReference) referenceQueue.poll();
while (reference != null) {
reference.clear();
references.remove(reference.managedConnectionInfo);
ConnectionInfo released = new ConnectionInfo(reference.managedConnectionInfo);
reference.interceptor.returnConnection(released, ConnectionReturnAction.DESTROY);
reference = (ProxyPhantomReference) referenceQueue.poll();
}
}
/**
* Proxies new connection handles so we can detect when they have been garbage collected.
*
* @param interceptor the interceptor used to release the managed connection when the handled is garbage collected.
* @param connectionInfo the connection that was obtained
* @param reassociate should always be false
*/
public void handleObtained(ConnectionTrackingInterceptor interceptor, ConnectionInfo connectionInfo, boolean reassociate) throws ResourceException {
if (!reassociate) {
proxyConnection(interceptor, connectionInfo);
}
}
/**
* Removes the released collection from the garbage collection reference tracker, since this
* connection is being release via a normal close method.
*
* @param interceptor ignored
* @param connectionInfo the connection that was released
* @param action ignored
*/
public void handleReleased(ConnectionTrackingInterceptor interceptor, ConnectionInfo connectionInfo, ConnectionReturnAction action) {
PhantomReference phantomReference = references.remove(connectionInfo.getManagedConnectionInfo());
if (phantomReference != null) {
phantomReference.clear();
}
}
private void proxyConnection(ConnectionTrackingInterceptor interceptor, ConnectionInfo connectionInfo) throws ResourceException {
// if this connection already has a proxy no need to create another
if (connectionInfo.getConnectionProxy() != null) return;
// DissociatableManagedConnection do not need to be proxied
if (connectionInfo.getManagedConnectionInfo().getManagedConnection() instanceof DissociatableManagedConnection) {
return;
}
try {
Object handle = connectionInfo.getConnectionHandle();
ConnectionInvocationHandler invocationHandler = new ConnectionInvocationHandler(handle);
Object proxy = Proxy.newProxyInstance(handle.getClass().getClassLoader(), handle.getClass().getInterfaces(), invocationHandler);
connectionInfo.setConnectionProxy(proxy);
ProxyPhantomReference reference = new ProxyPhantomReference(interceptor, connectionInfo.getManagedConnectionInfo(), invocationHandler, referenceQueue);
references.put(connectionInfo.getManagedConnectionInfo(), reference);
} catch (Throwable e) {
throw new ResourceException("Unable to construct connection proxy", e);
}
}
public static class ConnectionInvocationHandler implements InvocationHandler {
private final Object handle;
public ConnectionInvocationHandler(Object handle) {
this.handle = handle;
}
public Object invoke(Object object, Method method, Object[] args) throws Throwable {
if (method.getDeclaringClass() == Object.class) {
if (method.getName().equals("finalize")) {
// ignore the handle will get called if it implemented the method
return null;
}
if (method.getName().equals("clone")) {
throw new CloneNotSupportedException();
}
}
try {
Object value = method.invoke(handle, args);
return value;
} catch (InvocationTargetException ite) {
// catch InvocationTargetExceptions and turn them into the target exception (if there is one)
Throwable t = ite.getTargetException();
if (t != null) {
throw t;
}
throw ite;
}
}
}
private static class ProxyPhantomReference extends PhantomReference<ConnectionInvocationHandler> {
private ConnectionTrackingInterceptor interceptor;
private ManagedConnectionInfo managedConnectionInfo;
@SuppressWarnings({"unchecked"})
public ProxyPhantomReference(ConnectionTrackingInterceptor interceptor,
ManagedConnectionInfo managedConnectionInfo,
ConnectionInvocationHandler handler,
ReferenceQueue referenceQueue) {
super(handler, referenceQueue);
this.interceptor = interceptor;
this.managedConnectionInfo = managedConnectionInfo;
}
}
}