001    /**
002     * Copyright (c) 2000-present 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.search.buffer;
016    
017    import com.liferay.portal.kernel.util.AutoResetThreadLocal;
018    
019    import java.util.ArrayList;
020    import java.util.Collection;
021    import java.util.LinkedHashMap;
022    import java.util.List;
023    
024    /**
025     * @author Michael C. Han
026     */
027    public class IndexerRequestBuffer {
028    
029            public static IndexerRequestBuffer create() {
030                    List<IndexerRequestBuffer> indexerRequestBuffers =
031                            _indexerRequestBuffersThreadLocal.get();
032    
033                    IndexerRequestBuffer indexerRequestBuffer = new IndexerRequestBuffer();
034    
035                    indexerRequestBuffers.add(indexerRequestBuffer);
036    
037                    return indexerRequestBuffer;
038            }
039    
040            public static IndexerRequestBuffer get() {
041                    List<IndexerRequestBuffer> indexerRequestBuffers =
042                            _indexerRequestBuffersThreadLocal.get();
043    
044                    if (indexerRequestBuffers.isEmpty()) {
045                            return null;
046                    }
047    
048                    return indexerRequestBuffers.get(indexerRequestBuffers.size() - 1);
049            }
050    
051            public static IndexerRequestBuffer remove() {
052                    List<IndexerRequestBuffer> indexerRequestBuffers =
053                            _indexerRequestBuffersThreadLocal.get();
054    
055                    if (indexerRequestBuffers.isEmpty()) {
056                            return null;
057                    }
058    
059                    return indexerRequestBuffers.remove(indexerRequestBuffers.size() - 1);
060            }
061    
062            public void add(IndexerRequest indexerRequest) {
063                    _indexerRequests.put(indexerRequest, indexerRequest);
064            }
065    
066            public void clear() {
067                    _indexerRequests.clear();
068            }
069    
070            public Collection<IndexerRequest> getIndexerRequests() {
071                    return _indexerRequests.values();
072            }
073    
074            public boolean isEmpty() {
075                    return _indexerRequests.isEmpty();
076            }
077    
078            public void remove(IndexerRequest indexerRequest) {
079                    _indexerRequests.remove(indexerRequest);
080            }
081    
082            public int size() {
083                    return _indexerRequests.size();
084            }
085    
086            private static final ThreadLocal<List<IndexerRequestBuffer>>
087                    _indexerRequestBuffersThreadLocal =
088                            new AutoResetThreadLocal<List<IndexerRequestBuffer>>(
089                                    IndexerRequestBuffer.class +
090                                            "._indexerRequestBuffersThreadLocal") {
091    
092                                    @Override
093                                    protected List<IndexerRequestBuffer> initialValue() {
094                                            return new ArrayList<IndexerRequestBuffer>();
095                                    }
096    
097                            };
098    
099            private final LinkedHashMap<IndexerRequest, IndexerRequest>
100                    _indexerRequests = new LinkedHashMap<IndexerRequest, IndexerRequest>();
101    
102    }