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/*
* Copyright (C) 2022 NotEnoughUpdates contributors
*
* This file is part of NotEnoughUpdates.
*
* NotEnoughUpdates is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* NotEnoughUpdates is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
*/
package io.github.moulberry.notenoughupdates.util;
/**
* This debouncer always triggers on the leading edge.
* <p>
* Calling {@link #trigger} will only result in a truthy return value the first time it is called
* within {@link #getDelayInNanoSeconds()} nanoseconds.
*/
public class Debouncer {
private long lastPinged = 0L;
private final long delay;
public Debouncer(long minimumDelayInNanoSeconds) {
this.delay = minimumDelayInNanoSeconds;
}
public long getDelayInNanoSeconds() {
return delay;
}
public synchronized long timePassed() {
// longs are technically not atomic reads since they use two 32 bit registers
// so, yes, this technically has to be synchronized
return System.nanoTime() - lastPinged;
}
public synchronized boolean trigger() {
long newPingTime = System.nanoTime();
long newDelay = newPingTime - lastPinged;
lastPinged = newPingTime;
return newDelay >= this.delay;
}
}
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