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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 org.apache.tuscany.sca.invocation.InterceptorAsync;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.InvokerAsyncRequest;
import org.apache.tuscany.sca.invocation.InvokerAsyncResponse;
import org.apache.tuscany.sca.invocation.Message;
/**
* A base class that holds the mechanics for representing
* chained interceptors and for driving processing up and
* down the chain.
*
*/
public abstract class InterceptorAsyncImpl implements InterceptorAsync {
protected Invoker next;
protected InvokerAsyncResponse previous;
public Invoker getNext() {
return (Invoker)next;
}
public void setNext(Invoker next) {
this.next = next;
}
public InvokerAsyncResponse getPrevious() {
return previous;
}
public void setPrevious(InvokerAsyncResponse previous) {
this.previous = previous;
}
public Message invoke(Message msg) {
msg = processRequest(msg);
Message resultMsg = getNext().invoke(msg);
resultMsg = processResponse(resultMsg);
return resultMsg;
}
public void invokeAsyncRequest(Message msg) throws Throwable {
try{
msg = processRequest(msg);
InvokerAsyncRequest theNext = (InvokerAsyncRequest)getNext();
if( theNext != null ) theNext.invokeAsyncRequest(msg);
postProcessRequest(msg);
} catch (Throwable e) {
postProcessRequest(msg, e);
} // end try
} // end method invokeAsyncRequest
public void invokeAsyncResponse(Message msg) {
msg = processResponse(msg);
InvokerAsyncResponse thePrevious = (InvokerAsyncResponse)getPrevious();
if (thePrevious != null ) thePrevious.invokeAsyncResponse(msg);
} // end method invokeAsyncResponse
/**
* Basic null version of postProcessRequest - subclasses should override for any required
* real processing
*/
public Message postProcessRequest(Message msg) {
// Default processing is to do nothing
return msg;
} // end method postProcessRequest
/**
* Basic null version of postProcessRequest - subclasses should override for any required
* real processing
* @throws Throwable
*/
public Message postProcessRequest(Message msg, Throwable e) throws Throwable {
// Default processing is to rethrow the exception
throw e;
} // end method postProcessRequest
/**
* A testing method while I use the local SCA binding wire to look
* at how the async response path works. This allows me to detect the
* point where the reference wire turns into the service with in the
* optimized case
*
* @return
*/
public boolean isLocalSCABIndingInvoker() {
return false;
}
}
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