104 lines
2.5 KiB
Java
104 lines
2.5 KiB
Java
/**
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* Copyright (C) 2007 - 2016 52°North Initiative for Geospatial Open Source
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* Software GmbH
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* If the program is linked with libraries which are licensed under one of
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* the following licenses, the combination of the program with the linked
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* library is not considered a "derivative work" of the program:
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*
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* • Apache License, version 2.0
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* • Apache Software License, version 1.0
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* • GNU Lesser General Public License, version 3
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* • Mozilla Public License, versions 1.0, 1.1 and 2.0
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* • Common Development and Distribution License (CDDL), version 1.0
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*
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* Therefore the distribution of the program linked with libraries licensed
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* under the aforementioned licenses, is permitted by the copyright holders
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* if the distribution is compliant with both the GNU General Public
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* License version 2 and the aforementioned licenses.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*/
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package org.n52.wps.server;
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import java.util.ArrayList;
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/**
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* @author Matthias Mueller, TU Dresden
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*
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*/
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public class ProcessIDRegistry {
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private static ProcessIDRegistry instance = new ProcessIDRegistry();
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private volatile boolean lock = false;
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private static ArrayList<String> idList = new ArrayList<String>();
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private ProcessIDRegistry(){
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//empty private constructor
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}
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public static ProcessIDRegistry getInstance(){
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return instance;
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}
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public boolean addID(String id){
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while (lock){
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//spin
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}
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try{
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lock = true;
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boolean retval = idList.add(id);
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lock = false;
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return retval;
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}
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finally{
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lock = false;
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}
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}
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public synchronized boolean removeID(String id){
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while (lock){
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//spin
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}
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try{
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lock = true;
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boolean retval = idList.remove(id);
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lock = false;
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return retval;
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}
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finally{
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lock = false;
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}
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}
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public boolean containsID(String id){
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return idList.contains(id);
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}
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public String[] getIDs(){
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return idList.toArray(new String[idList.size()]);
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}
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protected void clearRegistry(){
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while (lock){
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//spin
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}
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try{
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lock = true;
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idList.clear();
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lock = false;
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}
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finally{
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lock = false;
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}
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}
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}
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