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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 java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.List;
import java.util.logging.Logger;
import org.apache.tuscany.sca.assembly.Composite;
import org.apache.tuscany.sca.contribution.Contribution;
import org.apache.tuscany.sca.contribution.DeployedArtifact;
import org.apache.tuscany.sca.contribution.service.impl.ContributionServiceImpl;
import org.osoa.sca.CallableReference;
import org.apache.tuscany.sca.node.management.SCANodeManagerInitService;
import org.apache.tuscany.sca.node.SCANode;
import org.apache.tuscany.sca.node.impl.SCANodeImpl;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.osoa.sca.ComponentContext;
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 java.util.LinkedList;
import java.util.ArrayList;
@Scope("COMPOSITE")
@Service(interfaces = { SCANodeManagerInitService.class, WorkerManager.class })
public class WorkerManagerImpl implements WorkerManager, SCANodeManagerInitService {
private Logger log = Logger.getLogger(WorkerManagerImpl.class.getName());
private LinkedList<CallableReference<WorkerService>> activeWorkers = new LinkedList<CallableReference<WorkerService>>();
private List<String> workerComponentNames = new ArrayList<String>();
private SCANodeImpl node;
@Property
protected String nodeName;
@Property
protected String compositeName;
@Property
protected String workerClass;
@Context
protected ComponentContext context;
private double loadAverage;
/* This method is used to find a composite inside all deployed artifacts */
private Composite findComposite(List<Composite> artifacts) {
for (Composite fact : artifacts) {
log.info("Searching in a contribution deployed artifacts -"
+ compositeName);
Composite augmented = (Composite) fact;
// found
if (augmented.getURI().equals(compositeName)) {
log.info("Found composite..." + compositeName);
return augmented;
}
}
}
return null;
}
public CallableReference<WorkerService> addWorker() {
log.info("Adding a new worker call..");
long addWorkerStartTime = System.nanoTime();
ContributionServiceImpl cServiceImpl = (ContributionServiceImpl) node.getContributionService();
Contribution contribution = cServiceImpl.getContribution(nodeName);
List<Composite> artifacts = contribution.getDeployables();
CallableReference<WorkerService> workerReference = null;
CallableReference<WorkerService> ref = null;
log.info("Creating a MetaComponentWorker..");
MetaComponentWorker mcw = new MetaComponentWorker();
boolean found = false;
mcw.setWorkerClass(workerClass);
Composite augmented = findComposite(artifacts);
try {
if (augmented != null) {
long startCreation = System.nanoTime();
node.addComponentToComposite(mcw, contribution.getURI(),
augmented.getURI());
System.out.println("addComponentToComposite time = "
+ (System.nanoTime() - startCreation));
RuntimeComponent workerComponent = (RuntimeComponent) node
.getComponent(mcw.getName());
if (workerComponent != null) {
ref = (CallableReference<WorkerService>) workerComponent
.getComponentContext().createSelfReference(
WorkerService.class);
ref.getService().start();
activeWorkers.addLast(ref);
workerComponentNames.add(mcw.getName());
CallableReference<WorkerManager> manager = (CallableReference) context
.createSelfReference(WorkerManager.class,
"WorkerManager");
ref.getService().registerManager(manager);
return ref;
}
} else {
log.info("Workpool composite not found!");
}
} catch (Exception e) {
log.info("Exception activation");
e.printStackTrace();
}
;
System.out.println("Component Creation Time ="
+ (System.nanoTime() - addWorkerStartTime));
return ref;
}
public boolean removeAllWorkers() {
for (CallableReference<WorkerService> callable : activeWorkers) {
callable.getService().stop();
}
return true;
}
public boolean removeWorker() {
CallableReference<WorkerService> callable = activeWorkers
.removeLast();
callable.getService().stop();
return true;
}
public boolean removeWorkers(int k) {
if (k >= activeWorkers.size())
return false;
for (int i = 0; i < k; ++i) {
if (!removeWorker())
return false;
}
return true;
}
public void setNode(SCANode node) {
this.node = (SCANodeImpl) node;
}
public double getNodeLoad() {
/*
* FIXME [jo] this works only on Linux To be replaced with an JNI
* extension
*/
RandomAccessFile statfile;
this.loadAverage = 1.0;
// load = 0;
int NoProcessors = 0;
String cpuLine = null;
try {
NoProcessors = Runtime.getRuntime().availableProcessors();
if (NoProcessors > 1)
this.loadAverage = 1 / (1.0 * NoProcessors);
statfile = new RandomAccessFile("/proc/loadavg", "r");
try {
statfile.seek(0);
cpuLine = statfile.readLine();
} catch (IOException e) {
// FIX ME: Better exception handling.
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (NumberFormatException e) {
e.printStackTrace();
}
double min1;
if (cpuLine != null) {
java.util.StringTokenizer st = new java.util.StringTokenizer(
cpuLine, " ");
min1 = Double.parseDouble(st.nextToken());
} else
min1 = 0;
return min1 * this.loadAverage;
}
public int activeWorkers() {
return activeWorkers.size();
}
public boolean removeWorker(String workerName) {
RuntimeComponent workerComponent = (RuntimeComponent) node
.getComponent(workerName);
if (workerComponent != null) {
log.info("Removing component " + workerName);
node.removeComponentFromComposite(nodeName, "Workpool.composite",
workerName);
return true;
}
return false;
}
public void start() {
// do nothing for now.
}
}
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