1 files changed, 124 insertions, 0 deletions
diff --git a/sandbox/sebastien/java/embed/modules/core/src/main/java/org/apache/tuscany/sca/core/context/impl/CallbackServiceReferenceImpl.java b/sandbox/sebastien/java/embed/modules/core/src/main/java/org/apache/tuscany/sca/core/context/impl/CallbackServiceReferenceImpl.java
new file mode 100644
index 0000000000..542a80f926
--- /dev/null
+++ b/sandbox/sebastien/java/embed/modules/core/src/main/java/org/apache/tuscany/sca/core/context/impl/CallbackServiceReferenceImpl.java
@@ -0,0 +1,124 @@
+/*
+ * 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.Endpoint;
+import org.apache.tuscany.sca.assembly.EndpointReference;
+import org.apache.tuscany.sca.context.CompositeContext;
+import org.apache.tuscany.sca.context.ThreadMessageContext;
+import org.apache.tuscany.sca.invocation.Message;
+import org.apache.tuscany.sca.runtime.RuntimeEndpointReference;
+import org.oasisopen.sca.ServiceRuntimeException;
+
+public class CallbackServiceReferenceImpl<B> extends ServiceReferenceImpl<B> {
+    private RuntimeEndpointReference callbackEPR;
+    private List<? extends EndpointReference> callbackEPRs;
+    private Endpoint resolvedEndpoint;
+
+    /*
+     * Public constructor for Externalizable serialization/deserialization
+     */
+    public CallbackServiceReferenceImpl() {
+        super();
+    }
+
+    public CallbackServiceReferenceImpl(Class<B> interfaze,
+                                        List<? extends EndpointReference> callbackEPRs) {
+        super(interfaze, null, getCompositeContext(callbackEPRs));
+        this.callbackEPRs = callbackEPRs;
+        init();
+    }
+    
+    private static CompositeContext getCompositeContext(List<? extends EndpointReference> callbackEPRs) {
+        if(!callbackEPRs.isEmpty()) {
+            RuntimeEndpointReference epr = (RuntimeEndpointReference) callbackEPRs.get(0);
+            return epr.getCompositeContext();
+        } 
+        return null;
+    }
+
+    public void init() {
+        Message msgContext = ThreadMessageContext.getMessageContext();
+        callbackEPR = selectCallbackEPR(msgContext);
+        if (callbackEPR == null) {
+            throw new ServiceRuntimeException("No callback binding found for " + msgContext.getTo().toString());
+        }
+        resolvedEndpoint = msgContext.getFrom().getCallbackEndpoint();
+    }
+
+    @Override
+    protected B createProxy() throws Exception {
+        return proxyFactory.createCallbackProxy(this);
+    }
+
+    public RuntimeEndpointReference getCallbackEPR() {
+        if (resolvedEndpoint == null) {
+            return null;
+        } else {
+            return cloneAndBind(callbackEPR);
+        }
+    }
+
+    public Endpoint getResolvedEndpoint() {
+        return resolvedEndpoint;
+    }
+
+    private RuntimeEndpointReference selectCallbackEPR(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 ServiceRuntimeException("Destination for forward call is not available");
+        }
+        for (EndpointReference epr : callbackEPRs) {
+            if (epr.getBinding().getName().equals(to.getBinding().getName())) {
+                return (RuntimeEndpointReference) epr;
+            }
+        }
+
+        // if no match, look for callback binding with same type as service binding
+        for (EndpointReference epr : callbackEPRs) {
+            if (epr.getBinding().getType().equals(to.getBinding().getType())) {
+                return (RuntimeEndpointReference) epr;
+            }
+        }
+
+        // no suitable callback wire was found
+        return null;
+    }
+
+    private RuntimeEndpointReference cloneAndBind(RuntimeEndpointReference endpointReference) {
+        if (resolvedEndpoint != null) {
+
+            try {
+                RuntimeEndpointReference epr = (RuntimeEndpointReference)endpointReference.clone();
+                epr.setTargetEndpoint(resolvedEndpoint);
+                return epr;
+            } catch (CloneNotSupportedException e) {
+                // will not happen
+                throw new ServiceRuntimeException(e);
+            }
+        } else {
+            return null;
+        }
+    }
+
+}