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ActiveMQ example source code file (StoreIndexWriter.java)
The ActiveMQ StoreIndexWriter.java source code/** * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.activemq.kaha.impl.index; import java.io.IOException; import java.io.RandomAccessFile; import org.apache.activemq.kaha.impl.DataManager; import org.apache.activemq.util.DataByteArrayOutputStream; /** * Optimized Store writer * * */ class StoreIndexWriter { protected final DataByteArrayOutputStream dataOut = new DataByteArrayOutputStream(); protected final RandomAccessFile file; protected final String name; protected final DataManager redoLog; /** * Construct a Store index writer * * @param file */ StoreIndexWriter(RandomAccessFile file) { this(file, null, null); } public StoreIndexWriter(RandomAccessFile file, String indexName, DataManager redoLog) { this.file = file; this.name = indexName; this.redoLog = redoLog; } void storeItem(IndexItem indexItem) throws IOException { if (redoLog != null) { RedoStoreIndexItem redo = new RedoStoreIndexItem(name, indexItem.getOffset(), indexItem); redoLog.storeRedoItem(redo); } dataOut.reset(); indexItem.write(dataOut); file.seek(indexItem.getOffset()); file.write(dataOut.getData(), 0, IndexItem.INDEX_SIZE); } void updateIndexes(IndexItem indexItem) throws IOException { if (redoLog != null) { RedoStoreIndexItem redo = new RedoStoreIndexItem(name, indexItem.getOffset(), indexItem); redoLog.storeRedoItem(redo); } dataOut.reset(); indexItem.updateIndexes(dataOut); file.seek(indexItem.getOffset()); file.write(dataOut.getData(), 0, IndexItem.INDEXES_ONLY_SIZE); } public void redoStoreItem(RedoStoreIndexItem redo) throws IOException { dataOut.reset(); redo.getIndexItem().write(dataOut); file.seek(redo.getOffset()); file.write(dataOut.getData(), 0, IndexItem.INDEX_SIZE); } } Other ActiveMQ examples (source code examples)Here is a short list of links related to this ActiveMQ StoreIndexWriter.java source code file: |
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