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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.core.wire.jdk;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import org.apache.tuscany.spi.component.TargetException;
import org.apache.tuscany.spi.component.WorkContext;
import org.apache.tuscany.spi.wire.AbstractInboundInvocationHandler;
import org.apache.tuscany.spi.wire.InboundInvocationChain;
import org.apache.tuscany.spi.wire.TargetInvoker;
import org.apache.tuscany.spi.wire.WireInvocationHandler;
/**
* Receives a request from a proxy and performs an invocation on an {@link org.apache.tuscany.spi.wire.InboundWire} via
* an {@link InboundInvocationChain}
*
* @version $Rev$ $Date$
*/
public class JDKInboundInvocationHandler extends AbstractInboundInvocationHandler
implements WireInvocationHandler, InvocationHandler {
/*
* an association of an operation to chain holder. The holder contains the invocation chain
* and a local clone of the master TargetInvoker. TargetInvokers will be cloned by the handler and placed in the
* holder if they are cacheable. This allows optimizations such as avoiding target resolution when a source refers
* to a target of greater scope since the target reference can be maintained by the invoker. When a target invoker
* is not cacheable, the master associated with the wire chains will be used.
*/
private Map<Method, ChainHolder> chains;
private WorkContext context;
private Object messageId;
private Object correlationId;
public JDKInboundInvocationHandler(Map<Method, InboundInvocationChain> invocationChains, WorkContext context) {
this.chains = new HashMap<Method, ChainHolder>(invocationChains.size());
for (Map.Entry<Method, InboundInvocationChain> entry : invocationChains.entrySet()) {
this.chains.put(entry.getKey(), new ChainHolder(entry.getValue()));
}
this.context = context;
}
/**
* Dispatches a client request made on a proxy
*/
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
ChainHolder holder = chains.get(method);
if (holder == null) {
if (method.getParameterTypes().length == 0 && "toString".equals(method.getName())) {
return "[Proxy - " + Integer.toHexString(hashCode()) + "]";
} else if (method.getDeclaringClass().equals(Object.class)
&& "equals".equals(method.getName())) {
// TODO implement
throw new UnsupportedOperationException();
} else if (Object.class.equals(method.getDeclaringClass())
&& "hashCode".equals(method.getName())) {
return hashCode();
// TODO beter hash algorithm
}
TargetException e = new TargetException("Operation not configured");
e.setIdentifier(method.getName());
throw e;
}
InboundInvocationChain chain = holder.chain;
TargetInvoker invoker;
if (holder.cachedInvoker == null) {
assert chain != null;
if (chain.getTargetInvoker() == null) {
TargetException e = new TargetException("No target invoker configured for operation");
e.setIdentifier(chain.getOperation().getName());
throw e;
}
if (chain.getTargetInvoker().isCacheable()) {
// clone and store the invoker locally
holder.cachedInvoker = (TargetInvoker) chain.getTargetInvoker().clone();
invoker = holder.cachedInvoker;
} else {
invoker = chain.getTargetInvoker();
}
} else {
assert chain != null;
invoker = chain.getTargetInvoker();
}
messageId = context.getCurrentMessageId();
context.setCurrentMessageId(null);
correlationId = context.getCurrentCorrelationId();
context.setCurrentCorrelationId(null);
return invoke(chain, invoker, args);
}
public Object invoke(Method method, Object[] args) throws Throwable {
return invoke(null, method, args);
}
/**
* A holder used to associate an wire chain with a local copy of a target invoker that was previously cloned from
* the chain master
*/
private class ChainHolder {
InboundInvocationChain chain;
TargetInvoker cachedInvoker;
public ChainHolder(InboundInvocationChain config) {
this.chain = config;
}
}
protected Object getMessageId() {
return messageId;
}
protected Object getCorrelationId() {
return correlationId;
}
}
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