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package eu.siacs.conversations.utils;
import java.util.ArrayDeque;
import java.util.Queue;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
public class SerialSingleThreadExecutor implements Executor {
final Executor executor = Executors.newSingleThreadExecutor();
final Queue<Runnable> tasks = new ArrayDeque();
Runnable active;
public synchronized void execute(final Runnable r) {
tasks.offer(new Runnable() {
public void run() {
try {
r.run();
} finally {
scheduleNext();
}
}
});
if (active == null) {
scheduleNext();
}
}
protected synchronized void scheduleNext() {
if ((active = tasks.poll()) != null) {
executor.execute(active);
}
}
}
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