001package com.pi4j.io.gpio.tasks.impl; 002 003/* 004 * #%L 005 * ********************************************************************** 006 * ORGANIZATION : Pi4J 007 * PROJECT : Pi4J :: Java Library (Core) 008 * FILENAME : GpioEventDebounceTaskImpl.java 009 * 010 * This file is part of the Pi4J project. More information about 011 * this project can be found here: https://www.pi4j.com/ 012 * ********************************************************************** 013 * %% 014 * Copyright (C) 2012 - 2019 Pi4J 015 * %% 016 * This program is free software: you can redistribute it and/or modify 017 * it under the terms of the GNU Lesser General Public License as 018 * published by the Free Software Foundation, either version 3 of the 019 * License, or (at your option) any later version. 020 * 021 * This program is distributed in the hope that it will be useful, 022 * but WITHOUT ANY WARRANTY; without even the implied warranty of 023 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 024 * GNU General Lesser Public License for more details. 025 * 026 * You should have received a copy of the GNU General Lesser Public 027 * License along with this program. If not, see 028 * <http://www.gnu.org/licenses/lgpl-3.0.html>. 029 * #L% 030 */ 031 032 033import com.pi4j.io.gpio.GpioFactory; 034import com.pi4j.io.gpio.GpioPinDigitalInput; 035import com.pi4j.io.gpio.PinState; 036import com.pi4j.io.gpio.event.PinDigitalStateChangeEvent; 037 038import java.util.concurrent.ExecutorService; 039 040public class GpioEventDebounceTaskImpl implements Runnable { 041 042 private final GpioPinDigitalInput pin; 043 private final PinState originalPinState; 044 private static ExecutorService executor; 045 046 public GpioEventDebounceTaskImpl(GpioPinDigitalInput pin, PinState state) { 047 executor = GpioFactory.getExecutorServiceFactory().getGpioEventExecutorService(); 048 this.originalPinState = state; 049 this.pin = pin; 050 } 051 052 @Override 053 public void run() { 054 // if the current pin state is not the same as the original pin state, 055 // then we need to raise a new pin event to notify the user that the pin 056 // state has changed during the debounce delay period 057 if(!pin.isState(originalPinState)){ 058 // add a new pin event notification to the thread pool for *immediate* execution 059 executor.execute(new GpioEventDispatchTaskImpl(pin, 060 new PinDigitalStateChangeEvent(this, pin.getPin(), pin.getState()))); 061 } 062 } 063}