1 files changed, 158 insertions, 0 deletions
diff --git a/sandbox/event/modules/binding-event/src/main/java/org/apache/tuscany/sca/binding/event/impl/EventBindingInterceptor.java b/sandbox/event/modules/binding-event/src/main/java/org/apache/tuscany/sca/binding/event/impl/EventBindingInterceptor.java
new file mode 100644
index 0000000000..cf15e54c33
--- /dev/null
+++ b/sandbox/event/modules/binding-event/src/main/java/org/apache/tuscany/sca/binding/event/impl/EventBindingInterceptor.java
@@ -0,0 +1,158 @@
+/*
+ * 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.binding.event.impl;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.interfacedef.InterfaceContractMapper;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.invocation.Interceptor;
+import org.apache.tuscany.sca.invocation.InvocationChain;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.Message;
+import org.apache.tuscany.sca.runtime.RuntimeComponentService;
+import org.apache.tuscany.sca.runtime.RuntimeWire;
+import org.osoa.sca.annotations.EventType;
+
+/**
+ * Policy interceptor for events
+ *
+ * @version $$
+ */
+public class EventBindingInterceptor implements Interceptor {
+    private Invoker next;
+    @SuppressWarnings("unused")
+    private Operation operation;
+    private RuntimeComponentService consumerService;
+    private Binding binding;
+    private InterfaceContractMapper interfaceContractMapper;
+
+    public EventBindingInterceptor(RuntimeComponentService consumerService, 
+            Binding binding, 
+            Operation operation,
+            InterfaceContractMapper interfaceContractMapper) {
+        super();
+        this.consumerService = consumerService;
+        this.operation = operation;
+        this.binding = binding;
+        this.interfaceContractMapper = interfaceContractMapper;
+    }
+
+    public Message invoke(Message msg) {
+        try {
+
+            Object arg = msg.getBody();
+            if (arg instanceof Object[]) {
+                arg = ((Object [])arg)[0];
+            }
+            
+            Operation consumerOperation = findOperation(consumerService.getInterfaceContract().getInterface().getOperations(), arg);
+
+            InvocationChain chain = getInvocationChain(consumerService.getRuntimeWire(binding), consumerOperation);
+            Invoker invoker = chain.getHeadInvoker();
+            while (invoker instanceof Interceptor && ((Interceptor)invoker).getNext() != null) {
+                invoker = ((Interceptor)invoker).getNext();
+            }
+            msg = invoker.invoke(msg);
+        } catch (Exception e) {
+            e.printStackTrace();
+            msg.setBody(e);
+        }
+        return msg;
+    }
+
+    public Invoker getNext() {
+        return next;
+    }
+
+    public void setNext(Invoker next) {
+        this.next = next;
+    }
+    
+    private String getEventType(Class<?> clazz) {
+        EventType eventTypeAnnotation = clazz.getAnnotation(EventType.class);
+        if (eventTypeAnnotation != null)
+            return eventTypeAnnotation.name();
+        if (clazz.getSuperclass() != null && clazz.getSuperclass() != Object.class) {
+            String eventType = getEventType(clazz.getSuperclass());
+            if (eventType != null)
+                return eventType;
+        }
+        for (Class<?> interfaze : clazz.getInterfaces()) {
+            String eventType = getEventType(interfaze);
+            if (eventType != null)
+                return eventType;
+        }
+        return null;
+    }
+    
+    @SuppressWarnings("unchecked")
+    private Operation findOperation(List<Operation> operations, Object arg) {
+        if (arg == null) {
+            return operations.get(0);
+        }
+        else {            
+            String eventType = getEventType(arg.getClass());
+
+            Operation firstMatching = null;
+            for (Operation op : operations) {
+                String[] eventTypes = op.getEventTypes();
+                if (eventTypes == null || eventTypes.length == 0) {
+                    
+                    if (op.getInputType().getLogical().get(0).getPhysical().isAssignableFrom(arg.getClass())) {
+                    
+                        // If no event type is specified, return the first method which 
+                        //   (1) has assignable parameters
+                        //   (2) has no explicit event types specified
+                        if (eventType == null) {
+
+                            return op;
+                        }
+                        else if (firstMatching == null) {
+                            // Remember first matching method without event types and
+                            // return this operation if no operation has explicitly specified
+                            // this event type.
+                            firstMatching = op;    
+                        }
+                    }
+                } else {
+                    for (String type : eventTypes) {
+                        if (type.equals(eventType)) {
+                            return op;
+                        }
+                    }                   
+                }
+                
+            }
+            return firstMatching;
+        }
+    }
+    
+    public InvocationChain getInvocationChain(RuntimeWire wire, Operation operation) {
+        for (InvocationChain chain : wire.getInvocationChains()) {
+            Operation op = chain.getTargetOperation();
+            if (interfaceContractMapper.isCompatible(operation, op, op.getInterface().isRemotable())) {
+                return chain;
+            } 
+        }
+        return null;
+    }
+    
+}