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/*
* 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.tuscany.sca.binding.rmi.provider;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.UndeclaredThrowableException;
import java.rmi.ConnectException;
import java.rmi.Remote;
import java.rmi.UnexpectedException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import org.apache.tuscany.sca.host.rmi.RMIHost;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
/**
* Invoker for RMI References.
*
* @version $Rev$ $Date$
*/
public class RMIBindingInvoker implements Invoker {
private RMIHost rmiHost;
private String uri;
private Method remoteMethod;
private Remote proxy;
public RMIBindingInvoker(RMIHost rmiHost, String uri, Method remoteMethod) {
this.rmiHost = rmiHost;
this.remoteMethod = remoteMethod;
this.uri = uri;
}
public Message invoke(Message msg) {
try {
Object[] args = msg.getBody();
Object resp = invokeTarget(args);
msg.setBody(resp);
} catch (InvocationTargetException e) {
msg.setFaultBody(e.getCause());
} catch (Throwable e) {
msg.setFaultBody(e);
}
return msg;
}
public Object invokeTarget(final Object payload) throws InvocationTargetException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException {
if (proxy == null) {
initProxy();
}
Object invocationResult = null;
InvocationTargetException rethrow = null;
try {
invocationResult = doInvokeTarget(payload);
} catch (InvocationTargetException e) {
// rethrow this exception from finally block unless it can be
// handled
rethrow = e;
// try to diagnose the error condition: proxy may be out-of-date
// (cf. TUSCANY-3850)
Throwable cause = e.getCause();
if (cause instanceof UndeclaredThrowableException) {
cause = cause.getCause();
if (cause instanceof UnexpectedException) {
cause = cause.getCause();
if (cause instanceof ConnectException) {
// retry invoke with a fresh proxy
rethrow = null;
proxy = rmiHost.findService(uri);
invocationResult = doInvokeTarget(payload);
}
}
}
} finally {
if (rethrow != null) {
throw rethrow;
}
}
return invocationResult;
}
private synchronized void initProxy() {
if (proxy == null) {
final Class<?> remote = remoteMethod.getDeclaringClass();
final ClassLoader stubClassLoader = remote.getClassLoader();
// The generated remote interface is not available for the service
// lookup
final ClassLoader tccl = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
ClassLoader tccl = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(stubClassLoader);
return tccl;
}
});
try {
// The proxy cannot be cached as the remote services can be rebound
proxy = rmiHost.findService(uri);
} finally {
AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
ClassLoader current = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(tccl);
return current;
}
});
}
}
}
private Object doInvokeTarget(final Object payload) throws InvocationTargetException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException {
remoteMethod = proxy.getClass().getMethod(remoteMethod.getName(), remoteMethod.getParameterTypes());
if (payload != null && !payload.getClass().isArray()) {
return remoteMethod.invoke(proxy, payload);
} else {
return remoteMethod.invoke(proxy, (Object[])payload);
}
}
}
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