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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.hessian.destination;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.tuscany.spi.model.physical.PhysicalOperationDefinition;
import org.apache.tuscany.spi.wire.InvocationChain;
import org.apache.tuscany.spi.wire.Message;
import org.apache.tuscany.spi.wire.MessageImpl;
import org.apache.tuscany.spi.wire.Wire;
import com.caucho.hessian.io.AbstractHessianInput;
import com.caucho.hessian.io.AbstractHessianOutput;
import org.apache.tuscany.hessian.Destination;
import org.apache.tuscany.hessian.InvocationException;
import org.apache.tuscany.hessian.TypeNotFoundException;
/**
* Base implementation of a Destination
*
* @version $Rev$ $Date$
*/
public class AbstractDestination implements Destination {
protected Map<String, ChainHolder> chains;
private ClassLoader loader;
protected AbstractDestination(Wire wire, ClassLoader loader) throws TypeNotFoundException {
this.loader = loader;
chains = new HashMap<String, ChainHolder>();
for (Map.Entry<PhysicalOperationDefinition, InvocationChain> entry : wire.getPhysicalInvocationChains()
.entrySet()) {
PhysicalOperationDefinition operation = entry.getKey();
String operationName = operation.getName();
InvocationChain chain = entry.getValue();
List<String> params = operation.getParameters();
Class<?>[] paramTypes = new Class<?>[params.size()];
// load the param types in the target's classloader
for (int i = 0; i < params.size(); i++) {
String param = params.get(i);
try {
paramTypes[i] = loader.loadClass(param);
} catch (ClassNotFoundException e) {
throw new TypeNotFoundException("Operation parameter type not found", operationName, e);
}
}
AbstractDestination.ChainHolder holder =
new AbstractDestination.ChainHolder(paramTypes, chain);
chains.put(operationName, holder);
}
}
public void invoke(AbstractHessianInput in, AbstractHessianOutput out) throws InvocationException {
ClassLoader oldLoader = Thread.currentThread().getContextClassLoader();
try {
// ensure serialization is done on the target classloader
Thread.currentThread().setContextClassLoader(loader);
in.readCall();
String m = in.readMethod();
ChainHolder holder = chains.get(m);
if (holder == null) {
out.startReply();
out.writeFault("OperationNotFound", "The service has no method named: " + m, null);
out.completeReply();
return;
}
Class<?>[] paramType = holder.types;
Object[] values = new Object[paramType.length];
for (int n = 0; n < paramType.length; n++) {
values[n] = in.readObject(paramType[n]);
}
in.completeCall();
Message msg = new MessageImpl();
InvocationChain chain = holder.chain;
Message ret = chain.getHeadInterceptor().invoke(msg);
out.startReply();
Object o = ret.getBody();
out.writeObject(o);
out.completeReply();
} catch (IOException e) {
throw new InvocationException(e);
} finally {
Thread.currentThread().setContextClassLoader(oldLoader);
}
}
protected class ChainHolder {
Class<?>[] types;
InvocationChain chain;
public ChainHolder(Class<?>[] types, InvocationChain chain) {
this.types = types;
this.chain = chain;
}
}
}
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