001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.resiliency.spi;
016    
017    import com.liferay.portal.kernel.process.ProcessExecutor;
018    
019    import java.util.concurrent.ConcurrentMap;
020    
021    /**
022     * @author Shuyang Zhou
023     */
024    public class SPIUtil {
025    
026            public static SPI getSPI() {
027                    if (_spi == null) {
028                            throw new IllegalStateException(
029                                    "Current process is not an SPI instance");
030                    }
031    
032                    return _spi;
033            }
034    
035            public static boolean isSPI() {
036                    if (_spi == null) {
037                            return false;
038                    }
039                    else {
040                            return true;
041                    }
042            }
043    
044            private static final SPI _spi;
045    
046            static {
047                    ConcurrentMap<String, Object> attributes =
048                            ProcessExecutor.ProcessContext.getAttributes();
049    
050                    _spi = (SPI)attributes.remove(SPI.SPI_INSTANCE_PUBLICATION_KEY);
051            }
052    
053    }