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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.implementation.java.invocation;
import java.util.List;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Interceptor;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.policy.util.PolicyHandler;
/**
* An interceptor to invoke policy handlers before and after the invocation of operations on
* an implementation.
*
* @version $Rev$ $Date$
*/
public class PolicyHandlingInterceptor implements Interceptor {
private Invoker next;
private List<PolicyHandler> policyHandlers = null;
private Operation targetOperation = null;
public PolicyHandlingInterceptor(Operation targetOperation, List<PolicyHandler> policyHandlers) {
this.policyHandlers = policyHandlers;
this.targetOperation = targetOperation;
}
public Message invoke(Message msg) {
try {
applyPreInvocationPolicies(targetOperation, msg);
msg = next.invoke(msg);
} finally {
applyPostInvocationPolices(targetOperation, msg);
}
return msg;
}
public void setNext(Invoker next) {
this.next = next;
}
public Invoker getNext() {
return next;
}
private void applyPreInvocationPolicies(Object... context) {
for (PolicyHandler policyHandler : policyHandlers) {
policyHandler.beforeInvoke(context);
}
}
private void applyPostInvocationPolices(Object... context) {
for ( int count = policyHandlers.size() - 1 ; count >= 0 ; --count) {
policyHandlers.get(count).afterInvoke(context);
}
}
}
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