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/*******************************************************************************
* Copyright (c) 2011 protos software gmbh (http://www.protos.de).
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* CONTRIBUTORS:
* Thomas Schuetz
*
*******************************************************************************/
package org.eclipse.etrice.runtime.java.messaging;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
* The MessageServiceController controls life cycle of and access to all MessageServices in one SubSystem.
*
* @author Thomas Schuetz
* @author Thomas Jung
* @author Henrik Rentz-Reichert
*
*/
public class MessageServiceController {
private HashMap<Integer, IMessageService> messageServices = new HashMap<Integer, IMessageService>();
private LinkedList<IMessageService> orderedMessageServices = new LinkedList<IMessageService>();
private LinkedList<Integer> freeIDs = new LinkedList<Integer>();
private boolean running = false;
private int nextFreeID = 0;
public synchronized int getNewID() {
if (freeIDs.isEmpty())
return nextFreeID++;
else
return freeIDs.remove();
}
public synchronized void freeID(int id) {
freeIDs.add(id);
}
public synchronized void addMsgSvc(IMessageService msgSvc){
if (nextFreeID<=msgSvc.getAddress().threadID)
nextFreeID = msgSvc.getAddress().threadID+1;
messageServices.put(msgSvc.getAddress().threadID, msgSvc);
orderedMessageServices.add(msgSvc);
}
public synchronized void removeMsgSvc(IMessageService msgSvc){
messageServices.remove(msgSvc.getAddress().threadID);
orderedMessageServices.remove(msgSvc);
}
public synchronized IMessageService getMsgSvc(int id){
return messageServices.get(id);
}
public void start() {
Comparator<Thread> descendingPrioComparator = new Comparator<Thread>(){
@Override
public int compare(Thread o1, Thread o2) {
if(o1.getPriority() > o2.getPriority())
return -1;
if(o1.getPriority() < o2.getPriority())
return 1;
return 0;
}
};
// start all message services
List<Thread> threads = new ArrayList<Thread>(messageServices.size());
for (IMessageService msgSvc : orderedMessageServices){
Thread thread = new Thread(msgSvc, msgSvc.getName());
msgSvc.setThread(thread);
threads.add(thread);
}
Collections.sort(threads, descendingPrioComparator);
for(Thread thread : threads){
thread.start();
}
running = true;
}
public void stop() {
if (!running)
return;
//dumpThreads("org.eclipse.etrice.runtime.java.messaging.MessageServiceController.stop()");
terminate();
waitTerminate();
running = false;
}
/**
* @param msg
*
*/
protected void dumpThreads(String msg) {
System.out.println("<<< begin dump threads <<<");
System.out.println("=== "+msg);
Map<Thread, StackTraceElement[]> traces = Thread.getAllStackTraces();
for (Thread thread : traces.keySet()) {
System.out.println("thread "+thread.getName());
StackTraceElement[] elements = traces.get(thread);
int n = 2;
if (elements.length<n)
n = elements.length;
for (int i = 0; i < n; i++) {
System.out.println(" "+elements[i].toString());
}
}
System.out.println(">>> end dump threads >>>");
}
private void terminate() {
// terminate all message services
for (Iterator<IMessageService> it = orderedMessageServices.descendingIterator(); it.hasNext(); ) {
it.next().terminate();
}
}
/**
* waitTerminate waits blocking for all MessageServices to terminate
* ! not thread safe !
*/
public void waitTerminate() {
for (Iterator<IMessageService> it = orderedMessageServices.descendingIterator(); it.hasNext(); ) {
try {
IMessageService msgSvc = it.next();
if (msgSvc.getThread()==null)
continue;
msgSvc.getThread().join(1000); // wait at most 1000ms
if (msgSvc.getThread().isAlive())
System.out.println("### Message Service "
+ msgSvc.getName() + " could not be stopped");
}
catch (InterruptedException e1) {
}
}
}
public synchronized void resetAll() {
stop();
messageServices.clear();
orderedMessageServices.clear();
freeIDs.clear();
nextFreeID = 0;
}
}
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