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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.core.wire;
import java.net.URI;
import java.util.LinkedList;
import org.osoa.sca.ServiceRuntimeException;
import org.apache.tuscany.spi.component.WorkContext;
import org.apache.tuscany.spi.model.Scope;
import org.apache.tuscany.spi.services.work.WorkScheduler;
import org.apache.tuscany.spi.wire.Interceptor;
import org.apache.tuscany.spi.wire.Message;
import org.apache.tuscany.spi.wire.TargetInvoker;
import org.apache.tuscany.spi.wire.Wire;
/**
* Adds non-blocking behavior to an invocation chain
*
* @version $$Rev$$ $$Date$$
*/
public class NonBlockingInterceptor implements Interceptor {
private static final Message RESPONSE = new ImmutableMessage();
private WorkScheduler workScheduler;
private WorkContext workContext;
private Interceptor next;
public NonBlockingInterceptor(WorkScheduler workScheduler, WorkContext workContext) {
this.workScheduler = workScheduler;
this.workContext = workContext;
}
public NonBlockingInterceptor(WorkScheduler workScheduler, WorkContext workContext, Interceptor next) {
this.workScheduler = workScheduler;
this.workContext = workContext;
this.next = next;
}
public Message invoke(final Message msg) {
// Retrieve conversation id to transfer to new thread
// Notice that we cannot clear the conversation id from the current thread
final Object conversationID = workContext.getIdentifier(Scope.CONVERSATION);
// Schedule the invocation of the next interceptor in a new Work instance
try {
workScheduler.scheduleWork(new Runnable() {
public void run() {
workContext.setCorrelationId(null);
// if we got a conversation id, transfer it to new thread
if (conversationID != null) {
workContext.setIdentifier(Scope.CONVERSATION, conversationID);
}
next.invoke(msg);
}
});
} catch (Exception e) {
throw new ServiceRuntimeException(e);
}
return RESPONSE;
}
public Interceptor getNext() {
return next;
}
public void setNext(Interceptor next) {
this.next = next;
}
public boolean isOptimizable() {
return false;
}
/**
* A dummy message passed back on an invocation
*/
private static class ImmutableMessage implements Message {
public Object getBody() {
return null;
}
public void setBody(Object body) {
if (body != null) {
throw new UnsupportedOperationException();
}
}
public WorkContext getWorkContext() {
throw new UnsupportedOperationException();
}
public void setWorkContext(WorkContext workContext) {
throw new UnsupportedOperationException();
}
public void setTargetInvoker(TargetInvoker invoker) {
throw new UnsupportedOperationException();
}
public TargetInvoker getTargetInvoker() {
return null;
}
public Message getRelatedCallbackMessage() {
return null;
}
public URI getFromAddress() {
return null;
}
public void setFromAddress(URI fromAddress) {
throw new UnsupportedOperationException();
}
public void pushCallbackUri(URI fromAddress) {
throw new UnsupportedOperationException();
}
public LinkedList<URI> getCallbackUris() {
return null;
}
public void setCallbackUris(LinkedList<URI> uris) {
throw new UnsupportedOperationException();
}
public void pushCallbackWire(Wire wire) {
}
public LinkedList<Wire> getCallbackWires() {
return null;
}
public void setCallbackWires(LinkedList<Wire> wires) {
}
public Object getMessageId() {
return null;
}
public void setMessageId(Object messageId) {
throw new UnsupportedOperationException();
}
public Object getCorrelationId() {
return null;
}
public void setCorrelationId(Object correlationId) {
throw new UnsupportedOperationException();
}
public boolean isFault() {
return false;
}
public void setBodyWithFault(Object fault) {
throw new UnsupportedOperationException();
}
public short getConversationSequence() {
return TargetInvoker.NONE;
}
public void setConversationSequence(short sequence) {
}
}
}
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