2017-01-05 19:20:44 +01:00
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/*
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* Copyright (c) 2016, 7u83 <7u83@mail.ru>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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package sesim;
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import java.util.concurrent.Semaphore;
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/**
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*
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* @author 7u83 <7u83@mail.ru>
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*/
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public class Locker {
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2017-01-10 19:27:11 +01:00
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private final Semaphore AVAIL = new Semaphore(1, true);
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2017-01-05 19:20:44 +01:00
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2017-01-10 19:27:11 +01:00
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/**
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2017-01-12 23:16:37 +01:00
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* Acquire a lock
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2017-01-10 19:27:11 +01:00
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* @return
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*/
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2017-01-05 19:20:44 +01:00
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public boolean lock() {
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try {
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2017-01-10 19:27:11 +01:00
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AVAIL.acquire();
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2017-01-05 19:20:44 +01:00
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} catch (InterruptedException e) {
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return false;
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}
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return true;
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}
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public void unlock() {
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2017-01-10 19:27:11 +01:00
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AVAIL.release();
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2017-01-05 19:20:44 +01:00
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}
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}
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