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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 java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.tuscany.sca.assembly.Endpoint;
import org.apache.tuscany.sca.assembly.EndpointReference;
import org.apache.tuscany.sca.context.ThreadMessageContext;
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.work.WorkScheduler;
import org.oasisopen.sca.ServiceRuntimeException;
/**
* Adds non-blocking behavior to an invocation chain
*
* @version $Rev$ $Date$
*/
public class NonBlockingInterceptor extends InterceptorAsyncImpl {
private static final Message RESPONSE = new ImmutableMessage();
/**
* The JDK logger that will be used to log messages.
*/
private static final Logger LOGGER = Logger.getLogger(NonBlockingInterceptor.class.getName());
private WorkScheduler workScheduler;
public NonBlockingInterceptor(WorkScheduler workScheduler) {
this.workScheduler = workScheduler;
}
public NonBlockingInterceptor(WorkScheduler workScheduler, Interceptor next) {
this.workScheduler = workScheduler;
this.next = next;
}
/**
* Sets desired workScheduler to NonBlockingInterceptor. This is a useful function for the extension framework
* to set desired workmanager on the InvocationChain, other than default workmanager which is set per Tuscany runtime.
* Using this function, extension framework can set desired workmanager on InvocationChain during post wire processing.
* @param workScheduler workScheduler which contains workmanager
*/
public void setWorkScheduler(WorkScheduler workScheduler){
this.workScheduler = workScheduler;
}
/**
* For request/response messages use the workScheduler to break the connection between
* requests and the void response
*/
@Override
public Message invoke(final Message msg) {
// Schedule the invocation of the next interceptor in a new Work instance
try {
workScheduler.scheduleWork(new Runnable() {
public void run() {
Message context = ThreadMessageContext.setMessageContext(msg);
try {
Message response = null;
Throwable ex = null;
try {
response = next.invoke(msg);
} catch (Throwable t) {
ex = t;
}
// Tuscany-2225 - Did the @OneWay method complete successfully?
// (i.e. no exceptions)
if (response != null && response.isFault()) {
// The @OneWay method threw an Exception. Lets log it and
// then pass it on to the WorkScheduler so it can notify any
// listeners
ex = (Throwable)response.getBody();
}
if (ex != null) {
LOGGER.log(Level.SEVERE, "Exception from @OneWay invocation", ex);
throw new ServiceRuntimeException("Exception from @OneWay invocation", ex);
}
} finally {
ThreadMessageContext.setMessageContext(context);
}
}
});
} catch (Exception e) {
throw new ServiceRuntimeException(e);
}
return RESPONSE;
}
/**
* For forward async responses we just pass the message along
* as this is naturally one way
*/
public Message processRequest(Message msg) {
return msg;
}
/**
* This should never be called as a one way message won't
* expect a response
*/
public Message processResponse(Message msg) {
return null;
}
/**
* A dummy message passed back on an invocation
*/
private static class ImmutableMessage implements Message {
public <T> T getBody() {
return null;
}
public void setBody(Object body) {
if (body != null) {
throw new UnsupportedOperationException();
}
}
public Object getMessageID() {
return null;
}
public void setMessageID(Object messageId) {
throw new UnsupportedOperationException();
}
public boolean isFault() {
return false;
}
public void setFaultBody(Object fault) {
throw new UnsupportedOperationException();
}
public EndpointReference getFrom() {
return null;
}
public Endpoint getTo() {
return null;
}
public void setFrom(EndpointReference from) {
throw new UnsupportedOperationException();
}
public void setTo(Endpoint to) {
throw new UnsupportedOperationException();
}
public Operation getOperation() {
return null;
}
public void setOperation(Operation op) {
throw new UnsupportedOperationException();
}
public Map<String, Object> getHeaders() {
return null;
}
public <T> T getBindingContext() {
return null;
}
public <T> void setBindingContext(T bindingContext) {
}
}
}
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