001/** 002 * 003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved. 004 * 005 * This library is free software; you can redistribute it and/or 006 * modify it under the terms of the GNU Lesser General Public 007 * License as published by the Free Software Foundation; either 008 * version 2.1 of the License, or (at your option) any later version. 009 * 010 * This library is distributed in the hope that it will be useful, 011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 * Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public 016 * License along with this library. If not, see <http://www.gnu.org/licenses/>. 017 * 018 **/ 019package lucee.commons.lock; 020 021import lucee.runtime.exp.PageException; 022 023 024public interface Lock { 025 026 public void lock(long timeout) throws PageException; 027 028 public void unlock(); 029 030 /** 031 * Returns an estimate of the number of threads waiting to 032 * acquire this lock. The value is only an estimate because the number of 033 * threads may change dynamically while this method traverses 034 * internal data structures. This method is designed for use in 035 * monitoring of the system state, not for synchronization 036 * control. 037 * 038 * @return the estimated number of threads waiting for this lock 039 */ 040 public int getQueueLength(); 041}