| /** |
| * 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.File; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.nio.channels.FileLock; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import org.apache.activemq.kaha.impl.DataManager; |
| import org.apache.activemq.util.IOHelper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Optimized Store reader |
| * |
| * |
| */ |
| public final class IndexManager { |
| |
| public static final String NAME_PREFIX = "index-"; |
| private static final Logger LOG = LoggerFactory.getLogger(IndexManager.class); |
| private final String name; |
| private File directory; |
| private File file; |
| private RandomAccessFile indexFile; |
| private StoreIndexReader reader; |
| private StoreIndexWriter writer; |
| private DataManager redoLog; |
| private String mode; |
| private long length; |
| private IndexItem firstFree; |
| private IndexItem lastFree; |
| private boolean dirty; |
| private final AtomicLong storeSize; |
| private int freeSize = 0; |
| |
| public IndexManager(File directory, String name, String mode, DataManager redoLog, AtomicLong storeSize) throws IOException { |
| this.directory = directory; |
| this.name = name; |
| this.mode = mode; |
| this.redoLog = redoLog; |
| this.storeSize=storeSize; |
| initialize(); |
| } |
| |
| public synchronized boolean isEmpty() { |
| return lastFree == null && length == 0; |
| } |
| |
| public synchronized IndexItem getIndex(long offset) throws IOException { |
| IndexItem result = null; |
| if (offset >= 0) { |
| result = reader.readItem(offset); |
| } |
| return result; |
| } |
| |
| public synchronized IndexItem refreshIndex(IndexItem item) throws IOException { |
| reader.updateIndexes(item); |
| return item; |
| } |
| |
| public synchronized void freeIndex(IndexItem item) throws IOException { |
| item.reset(); |
| item.setActive(false); |
| if (lastFree == null) { |
| firstFree = item; |
| lastFree = item; |
| } else { |
| lastFree.setNextItem(item.getOffset()); |
| if (lastFree.equals(firstFree)) { |
| firstFree=new IndexItem(); |
| firstFree.copyIndex(lastFree); |
| writer.updateIndexes(firstFree); |
| } |
| writer.updateIndexes(lastFree); |
| lastFree=item; |
| } |
| writer.updateIndexes(item); |
| freeSize++; |
| dirty = true; |
| } |
| |
| public synchronized void storeIndex(IndexItem index) throws IOException { |
| writer.storeItem(index); |
| dirty = true; |
| } |
| |
| public synchronized void updateIndexes(IndexItem index) throws IOException { |
| try { |
| writer.updateIndexes(index); |
| } catch (Throwable e) { |
| LOG.error(name + " error updating indexes ", e); |
| } |
| dirty = true; |
| } |
| |
| public synchronized void redo(final RedoStoreIndexItem redo) throws IOException { |
| writer.redoStoreItem(redo); |
| dirty = true; |
| } |
| |
| public synchronized IndexItem createNewIndex() throws IOException { |
| IndexItem result = getNextFreeIndex(); |
| if (result == null) { |
| // allocate one |
| result = new IndexItem(); |
| result.setOffset(length); |
| length += IndexItem.INDEX_SIZE; |
| storeSize.addAndGet(IndexItem.INDEX_SIZE); |
| } |
| return result; |
| } |
| |
| public synchronized void close() throws IOException { |
| if (indexFile != null) { |
| indexFile.close(); |
| indexFile = null; |
| } |
| } |
| |
| public synchronized void force() throws IOException { |
| if (indexFile != null && dirty) { |
| indexFile.getFD().sync(); |
| dirty = false; |
| } |
| } |
| |
| public synchronized boolean delete() throws IOException { |
| firstFree = null; |
| lastFree = null; |
| if (indexFile != null) { |
| indexFile.close(); |
| indexFile = null; |
| } |
| return file.delete(); |
| } |
| |
| private synchronized IndexItem getNextFreeIndex() throws IOException { |
| IndexItem result = null; |
| if (firstFree != null) { |
| if (firstFree.equals(lastFree)) { |
| result = firstFree; |
| firstFree = null; |
| lastFree = null; |
| } else { |
| result = firstFree; |
| firstFree = getIndex(firstFree.getNextItem()); |
| if (firstFree == null) { |
| lastFree = null; |
| } |
| } |
| result.reset(); |
| writer.updateIndexes(result); |
| freeSize--; |
| } |
| return result; |
| } |
| |
| synchronized long getLength() { |
| return length; |
| } |
| |
| public final long size() { |
| return length; |
| } |
| |
| public synchronized void setLength(long value) { |
| this.length = value; |
| storeSize.addAndGet(length); |
| } |
| |
| public synchronized FileLock getLock() throws IOException { |
| return indexFile.getChannel().tryLock(0, indexFile.getChannel().size(), false); |
| } |
| |
| |
| public String toString() { |
| return "IndexManager:(" + NAME_PREFIX + name + ")"; |
| } |
| |
| protected void initialize() throws IOException { |
| file = new File(directory, NAME_PREFIX + IOHelper.toFileSystemSafeName(name) ); |
| IOHelper.mkdirs(file.getParentFile()); |
| indexFile = new RandomAccessFile(file, mode); |
| reader = new StoreIndexReader(indexFile); |
| writer = new StoreIndexWriter(indexFile, name, redoLog); |
| long offset = 0; |
| while ((offset + IndexItem.INDEX_SIZE) <= indexFile.length()) { |
| IndexItem index = reader.readItem(offset); |
| if (!index.isActive()) { |
| index.reset(); |
| if (lastFree != null) { |
| lastFree.setNextItem(index.getOffset()); |
| updateIndexes(lastFree); |
| lastFree = index; |
| } else { |
| lastFree = index; |
| firstFree = index; |
| } |
| freeSize++; |
| } |
| offset += IndexItem.INDEX_SIZE; |
| } |
| length = offset; |
| storeSize.addAndGet(length); |
| } |
| } |