/*
* 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.threads.impl;
import org.apache.openejb.OpenEJB;
import org.apache.openejb.threads.task.CUTask;
import javax.enterprise.concurrent.ContextService;
import javax.enterprise.concurrent.ManagedTask;
import javax.transaction.Transaction;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;
public class ContextServiceImpl implements ContextService {
private static final HashMap<String, String> EMPTY_PROPS = new HashMap<String, String>();
@Override
public <T> T createContextualProxy(final T instance, final Class<T> intf) {
return intf.cast(createContextualProxy(instance, new Class<?>[]{intf}));
}
@Override
public Object createContextualProxy(final Object instance, final Class<?>... interfaces) {
return createContextualProxy(instance, EMPTY_PROPS, interfaces);
}
@Override
public <T> T createContextualProxy(final T instance, final Map<String, String> executionProperties, final Class<T> intf) {
return intf.cast(createContextualProxy(instance, executionProperties, new Class<?>[]{intf}));
}
@Override
public Object createContextualProxy(final Object instance, final Map<String, String> executionProperties, final Class<?>... interfaces) {
return Proxy.newProxyInstance(instance.getClass().getClassLoader(), interfaces, new CUHandler(instance, executionProperties));
}
@Override
public Map<String, String> getExecutionProperties(final Object contextualProxy) {
return CUHandler.class.cast(Proxy.getInvocationHandler(contextualProxy)).properties;
}
private static final class CUHandler extends CUTask<Object> implements InvocationHandler, Serializable {
private final Object instance;
private final Map<String, String> properties;
private final boolean suspendTx;
private CUHandler(final Object instance, final Map<String, String> props) {
super(instance);
this.instance = instance;
this.properties = props;
this.suspendTx = ManagedTask.SUSPEND.equals(props.get(ManagedTask.TRANSACTION));
}
@Override
public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
if (method.getDeclaringClass() == Object.class) {
return method.invoke(this, args);
}
final Transaction suspendedTx;
if (suspendTx) {
suspendedTx = OpenEJB.getTransactionManager().suspend();
} else {
suspendedTx = null;
}
try {
return invoke(new Callable<Object>() {
@Override
public Object call() throws Exception {
return method.invoke(instance, args);
}
});
} finally {
if (suspendedTx != null) {
OpenEJB.getTransactionManager().resume(suspendedTx);
}
}
}
}
}