/********************************************************* begin of preamble
**
** Copyright (C) 2003-2010 Software- und Organisations-Service GmbH.
** All rights reserved.
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** This file may be used under the terms of either the
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** GNU General Public License version 2.0 (GPL)
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** Agreement for Purchase and Licensing
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** as offered by Software- und Organisations-Service GmbH
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package com.sos.scheduler.engine.kernel.main;
import com.sos.scheduler.engine.kernel.Scheduler;
import java.util.concurrent.atomic.AtomicReference;
class CoOp {
private final AtomicReference<Scheduler> schedulerAtom = new AtomicReference<Scheduler>();
private final Object schedulerAtomLock = new Object();
private volatile boolean terminateSchedulerWhenPossible = false;
private volatile SchedulerState state = SchedulerState.starting;
void onSchedulerStarted(Scheduler scheduler) {
boolean callTerminate = false;
synchronized (schedulerAtomLock) {
schedulerAtom.set(scheduler);
state = state.running;
schedulerAtomLock.notify();
callTerminate = terminateSchedulerWhenPossible;
}
if (callTerminate) scheduler.terminate();
}
void onSchedulerClosed() {
synchronized (schedulerAtomLock) {
state = SchedulerState.closed;
schedulerAtom.set(null);
schedulerAtomLock.notify();
}
}
void onTerminated() {
synchronized (schedulerAtomLock) {
state = state.threadTerminated;
schedulerAtomLock.notify();
}
}
Scheduler waitWhileSchedulerIsStarting() throws InterruptedException {
Scheduler result = null;
synchronized (schedulerAtomLock) {
while (state == SchedulerState.starting)
schedulerAtomLock.wait();
result = schedulerAtom.get();
}
return result;
}
void terminate() {
Scheduler scheduler = null;
synchronized (schedulerAtomLock) {
scheduler = schedulerAtom.get();
if (scheduler == null) terminateSchedulerWhenPossible = true;
}
if (scheduler != null) scheduler.terminate();
}
Scheduler getScheduler() {
return schedulerAtom.get();
}
SchedulerState getState() {
return state;
}
}