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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 workpool;
import org.osoa.sca.ComponentContext;
import org.osoa.sca.RequestContext;
import org.osoa.sca.ServiceReference;
import org.osoa.sca.annotations.Callback;
import org.osoa.sca.annotations.Context;
import org.osoa.sca.annotations.Property;
import org.osoa.sca.annotations.Scope;
import org.osoa.sca.annotations.Service;
import org.apache.tuscany.sca.core.context.CallableReferenceImpl;
import org.apache.tuscany.sca.databinding.annotation.DataBinding;
import org.apache.tuscany.sca.databinding.job.Job;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.*;
/**
* An implementation of the worker service.
*/
@Service(WorkerService.class)
@DataBinding("org.apache.tuscany.sca.databinding.job.Job")
@Scope("COMPOSITE")
public abstract class WorkerServiceImpl<T, E> implements WorkerService<T, E> {
private Logger log = Logger.getLogger(this.getClass().getName());
private WorkerServiceCallback workerServiceCallback;
@Context
protected ComponentContext workerContext;
@Context
protected RequestContext requestContext;
@Property
protected String workerName;
private CallableReferenceImpl<WorkerManager> managerReference = null;
/* TODO add the triggers, but before ask */
// protected Map<String,Trigger> triggers = new HashMap<String,Trigger>();
public abstract ResultJob computeTask(Job<T, E> job);
private boolean stopped = false;
private CallableReferenceImpl<WorkerService> serviceRef;
private CallableReferenceImpl<WorkpoolService> senderService;
private WorkpoolService wp = null;
private WorkerManager manager = null;
public void start() {
log.info("Starting worker...");
stopped = false;
serviceRef = (CallableReferenceImpl) workerContext
.createSelfReference(WorkerService.class);
}
public void init(CallableReferenceImpl<WorkpoolService> sender, Job nullJob) {
compute(nullJob);
}
public void stop() {
stopped = true;
}
@Callback
public void setWorkerServiceCallback(
WorkerServiceCallback workerServiceCallback) {
log.info("Setting worker callback");
this.workerServiceCallback = workerServiceCallback;
}
public void computeFirstTime(Job nullJob,
CallableReferenceImpl<WorkpoolService> sender) {
senderService = sender;
wp = sender.getService();
workWithCallable(nullJob);
}
public void registerManager(CallableReferenceImpl<WorkerManager> wm) {
managerReference = wm;
manager = managerReference.getService();
}
public void registerSender(CallableReferenceImpl<WorkpoolService> sender) {
log.info("Registering sender..");
senderService = sender;
wp = sender.getService();
}
private void workWithInjection(Job j) {
log.info("Worker has received job");
if (stopped) {
workerServiceCallback
.receiveResult(j, true, workerContext.getURI());
if (managerReference != null)
manager.removeWorker(workerContext.getURI());
} else if (j.eos()) {
if (managerReference != null)
manager.removeWorker(workerContext.getURI());
}
if (j instanceof NullJob) {
workerServiceCallback.receiveResult(j, false, workerContext
.getURI());
} else {
workerServiceCallback.receiveResult(computeTask(j), false,
workerContext.getURI());
}
}
private void workWithCallable(Job j) {
log.info("Worker " + workerContext.getURI()
+ " has received job with eos --> " + j.eos());
if (stopped) {
wp.handleResult(j, true, workerContext.getURI(), serviceRef, false);
return;
}
if (j.eos()) {
log.info("Got poison token...");
if (managerReference != null) {
log.info("Removing component " + workerContext.getURI());
manager.removeWorker(workerContext.getURI());
}
return;
}
if (j.getType() != Job.NULL_JOB) {
wp.handleResult(computeTask(j), false, workerContext.getURI(),
serviceRef, false);
} else {
log.info("Got a null job");
wp.handleResult(j, false, workerContext.getURI(), serviceRef, true);
}
}
public void compute(Job<T, E> j) {
if (senderService != null) {
log.info("Computing job using callable reference method");
workWithCallable(j);
} else {
log.info("Computing job using reference injection method");
workWithInjection(j);
}
}
/*
* public void addJobCompleteHandler(String triggerName,
* CallableReferenceImpl<Trigger> handle) { if
* (!triggers.containsKey(triggerName)) { triggers.put(triggerName,
* handle.getService()); } } public void removeJobCompleteHandler(String
* triggerName) { if (!triggers.containsKey(triggerName)) {
* triggers.remove(triggerName); } }
*/
}
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