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/*
* Copyright (c) 2014, Isode Limited, London, England.
* All rights reserved.
*/
/*
* Copyright (c) 2010 Remko Tronçon
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
package com.isode.stroke.eventloop;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
public class SimpleEventLoop extends EventLoop {
private boolean isRunning_;
private final List<Event> events_ = new ArrayList<Event>();
private final Object eventsMutex_ = new Object();
public SimpleEventLoop() {
isRunning_ = true;
}
@Override
protected void finalize() throws Throwable {
try {
synchronized (eventsMutex_) {
if (!events_.isEmpty()) {
System.err.println("Warning: Pending events in SimpleEventLoop at finalize time");
}
}
}
finally {
super.finalize();
}
}
public void run() {
doRun(false);
}
public void runUntilEvents() {
doRun(true);
}
private void doRun(boolean breakAfterEvents) {
while (isRunning_) {
List<Event> events = new ArrayList<Event>();
synchronized (eventsMutex_) {
while (events_.isEmpty()) {
try {
eventsMutex_.wait();
} catch (InterruptedException e) {
// Ignore
}
}
swapCollectionContents(events, events_);
}
for (Event event : events) {
handleEvent(event);
}
if (breakAfterEvents) {
return;
}
}
}
public void runOnce() {
List<Event> events = new ArrayList<Event>();
synchronized (eventsMutex_) {
swapCollectionContents(events, events_);
}
for (Event event : events) {
handleEvent(event);
}
}
public void stop() {
postEvent(new Event.Callback() {
@Override
public void run() {
doStop();
}
});
}
private void doStop() {
isRunning_ = false;
}
static <T> void swapCollectionContents(Collection<T> coll1, Collection<T> coll2) {
Collection<T> temp = new ArrayList<T>(coll1);
coll1.clear();
coll1.addAll(coll2);
coll2.clear();
coll2.addAll(temp);
}
@Override
protected void post(Event event) {
synchronized (eventsMutex_) {
events_.add(event);
eventsMutex_.notifyAll();
}
}
}
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