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PauseControllable.java
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PauseControllable.java
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package io.confluent.kpay.control;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class PauseControllable implements Controllable {
private long waitingSince;
private boolean paused = false;
private final Lock lock = new ReentrantLock();
private final Condition isPaused = lock.newCondition();
@Override
public boolean isPaused() {
return paused;
}
@Override
public boolean pauseMaybe() {
lock.lock();
try {
if (paused) {
try {
isPaused.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
} finally {
lock.unlock();
}
return true;
}
@Override
public void startProcessing() {
lock.lock();
try {
paused = false;
isPaused.signalAll();
} finally {
waitingSince = 0;
lock.unlock();
}
}
@Override
public void pauseProcessing() {
lock.lock();
try {
waitingSince = System.currentTimeMillis();
paused = true;
} finally {
lock.unlock();
}
}
public long getWaitingElaspedMs() {
if (waitingSince == 0) return 0;
return System.currentTimeMillis() - waitingSince;
}
}