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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.context.impl;
import java.util.List;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.assembly.Endpoint;
import org.apache.tuscany.sca.assembly.EndpointReference;
import org.apache.tuscany.sca.context.ThreadMessageContext;
import org.apache.tuscany.sca.core.assembly.impl.RuntimeWireImpl;
import org.apache.tuscany.sca.core.invocation.ProxyFactory;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeComponentReference;
import org.apache.tuscany.sca.runtime.RuntimeWire;
public class CallbackServiceReferenceImpl<B> extends ServiceReferenceImpl<B> {
private RuntimeWire wire;
private List<RuntimeWire> wires;
private Endpoint resolvedEndpoint;
/*
* Public constructor for Externalizable serialization/deserialization
*/
public CallbackServiceReferenceImpl() {
super();
}
public CallbackServiceReferenceImpl(Class<B> interfaze, List<RuntimeWire> wires, ProxyFactory proxyFactory) {
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().toString());
}
resolvedEndpoint = msgContext.getFrom().getCallbackEndpoint();
}
@Override
protected Object createProxy() throws Exception {
return proxyFactory.createCallbackProxy(this);
}
public RuntimeWire getCallbackWire() {
if (resolvedEndpoint == null) {
return null;
} else {
return cloneAndBind(wire);
}
}
public Endpoint getResolvedEndpoint() {
return resolvedEndpoint;
}
private RuntimeWire selectCallbackWire(Message msgContext) {
// look for callback binding with same name as service binding
Endpoint 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.getEndpointReference().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.getEndpointReference().getBinding().getClass() == to.getBinding().getClass()) {
return wire;
}
}
// no suitable callback wire was found
return null;
}
private RuntimeWire cloneAndBind(RuntimeWire wire) {
RuntimeWire boundWire = null;
if (resolvedEndpoint != null) {
boundWire = ((RuntimeWireImpl)wire).lookupCache(resolvedEndpoint);
if (boundWire != null) {
return boundWire;
}
try {
// TODO - EPR - is this correct?
// Fluff up a new response wire based on the callback endpoint
RuntimeComponentReference ref =
bind((RuntimeComponentReference)wire.getEndpointReference().getReference(),
resolvedEndpoint);
boundWire = ref.getRuntimeWires().get(0);
Binding binding = wire.getEndpointReference().getBinding();
((RuntimeWireImpl)wire).addToCache(resolvedEndpoint, boundWire);
} catch (CloneNotSupportedException e) {
// will not happen
}
}
return boundWire;
}
private RuntimeComponentReference bind(RuntimeComponentReference reference,
Endpoint callbackEndpoint) throws CloneNotSupportedException {
// clone the callback reference ready to configure it for this callback endpoint
RuntimeComponentReference ref = (RuntimeComponentReference)reference.clone();
ref.getTargets().clear();
ref.getBindings().clear();
ref.getEndpointReferences().clear();
// no access to the assembly factory so clone an existing epr
EndpointReference callbackEndpointReference = (EndpointReference)reference.getEndpointReferences().get(0).clone();
callbackEndpointReference.setReference(ref);
callbackEndpointReference.setTargetEndpoint(callbackEndpoint);
callbackEndpointReference.setUnresolved(true);
// TODO - should really use incoming callback info but awaiting
// decision from OASIS on what will happen with callbacks
// The callback endpoint will be resolved with the registry
// when the wire chains are created
ref.getEndpointReferences().add(callbackEndpointReference);
return ref;
}
}
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