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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.core.invocation;
import java.util.List;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.assembly.Contract;
import org.apache.tuscany.sca.assembly.OptimizableBinding;
import org.apache.tuscany.sca.core.assembly.RuntimeWireImpl;
import org.apache.tuscany.sca.core.context.CallableReferenceImpl;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.EndpointReference;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentReference;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
import org.apache.tuscany.sca.runtime.RuntimeWire;
/**
* Returns proxy instance for a wire callback
*
* @version $Rev: 576055 $ $Date: 2007-09-16 08:11:45 +0100 (Sun, 16 Sep 2007) $
*/
public class CallbackReferenceImpl<B> extends CallableReferenceImpl<B> {
private RuntimeWire wire;
private List<RuntimeWire> wires;
private EndpointReference resolvedEndpoint;
private Object convID;
public CallbackReferenceImpl(Class<B> interfaze, ProxyFactory proxyFactory, List<RuntimeWire> wires) {
super(interfaze, null, proxyFactory);
this.wires = wires;
init();
}
public void init() {
Message msgContext = ThreadMessageContext.getMessageContext();
wire = selectCallbackWire(msgContext);
if (wire == null) {
//FIXME: need better exception
throw new RuntimeException("No callback binding found for " + msgContext.getTo().getURI());
}
resolvedEndpoint = getCallbackEndpoint(msgContext);
convID = msgContext.getFrom().getReferenceParameters().getConversationID();
callbackID = msgContext.getFrom().getReferenceParameters().getCallbackID();
}
@Override
protected Object createProxy() throws Exception {
return proxyFactory.createCallbackProxy(this);
}
protected RuntimeWire getCallbackWire() {
if (resolvedEndpoint == null) {
return null;
} else {
return cloneAndBind(wire);
}
}
protected Object getConvID() {
return convID;
}
protected EndpointReference getResolvedEndpoint() {
return resolvedEndpoint;
}
private RuntimeWire selectCallbackWire(Message msgContext) {
// look for callback binding with same name as service binding
EndpointReference to = msgContext.getTo();
if (to == null) {
//FIXME: need better exception
throw new RuntimeException("Destination for forward call is not available");
}
for (RuntimeWire wire : wires) {
if (wire.getSource().getBinding().getName().equals(to.getBinding().getName())) {
return wire;
}
}
// if no match, look for callback binding with same type as service binding
for (RuntimeWire wire : wires) {
if (wire.getSource().getBinding().getClass() == to.getBinding().getClass()) {
return wire;
}
}
// no suitable callback wire was found
return null;
}
/**
* @param msgContext
*/
private static EndpointReference getCallbackEndpoint(Message msgContext) {
EndpointReference from = msgContext.getFrom();
if (from == null) {
return null;
}
return from.getReferenceParameters().getCallbackReference();
}
private RuntimeWire cloneAndBind(RuntimeWire wire) {
RuntimeWire boundWire = null;
if (resolvedEndpoint != null) {
boundWire = ((RuntimeWireImpl)wire).lookupCache(resolvedEndpoint);
if (boundWire != null) {
return boundWire;
}
try {
Contract contract = resolvedEndpoint.getContract();
RuntimeComponentReference ref = null;
if (contract == null) {
boundWire = (RuntimeWire)wire.clone();
} else if (contract instanceof RuntimeComponentReference) {
ref = (RuntimeComponentReference)contract;
boundWire = ref.getRuntimeWire(resolvedEndpoint.getBinding());
} else { // contract instanceof RuntimeComponentService
ref = bind((RuntimeComponentReference)wire.getSource().getContract(),
resolvedEndpoint.getComponent(),
(RuntimeComponentService)contract);
boundWire = ref.getRuntimeWires().get(0);
}
configureWire(boundWire);
((RuntimeWireImpl)wire).addToCache(resolvedEndpoint, boundWire);
} catch (CloneNotSupportedException e) {
// will not happen
}
}
return boundWire;
}
private static RuntimeComponentReference bind(RuntimeComponentReference reference,
RuntimeComponent component,
RuntimeComponentService service) throws CloneNotSupportedException {
RuntimeComponentReference ref = (RuntimeComponentReference)reference.clone();
ref.getTargets().add(service);
ref.getBindings().clear();
for (Binding binding : service.getBindings()) {
if (binding instanceof OptimizableBinding) {
OptimizableBinding optimizableBinding = (OptimizableBinding)((OptimizableBinding)binding).clone();
optimizableBinding.setTargetBinding(binding);
optimizableBinding.setTargetComponent(component);
optimizableBinding.setTargetComponentService(service);
ref.getBindings().add(optimizableBinding);
} else {
ref.getBindings().add(binding);
}
}
return ref;
}
private void configureWire(RuntimeWire wire) {
// need to set the endpoint on the binding also so that when the chains are created next
// the sca binding can decide whether to provide local or remote invokers.
// TODO - there is a problem here though in that I'm setting a target on a
// binding that may possibly be trying to point at two things in the multi threaded
// case. Need to confirm the general model here and how the clone and bind part
// is intended to work
Binding binding = wire.getSource().getBinding();
binding.setURI(resolvedEndpoint.getURI());
// also need to set the target contract as it varies for the sca binding depending on
// whether it is local or remote
RuntimeComponentReference ref = (RuntimeComponentReference)wire.getSource().getContract();
wire.getTarget().setInterfaceContract(ref.getBindingProvider(binding).getBindingInterfaceContract());
}
}
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