| /* |
| * 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.cassandra.io.sstable; |
| |
| import java.io.IOException; |
| import java.util.concurrent.locks.ReadWriteLock; |
| |
| import org.apache.cassandra.db.DecoratedKey; |
| import org.apache.cassandra.dht.IPartitioner; |
| import org.apache.cassandra.utils.AbstractIterator; |
| import org.apache.cassandra.utils.CloseableIterator; |
| |
| public class KeyIterator extends AbstractIterator<DecoratedKey> implements CloseableIterator<DecoratedKey> |
| { |
| private final IPartitioner partitioner; |
| private final KeyReader it; |
| private final ReadWriteLock fileAccessLock; |
| private final long totalBytes; |
| |
| private boolean initialized = false; |
| |
| public KeyIterator(KeyReader it, IPartitioner partitioner, long totalBytes, ReadWriteLock fileAccessLock) |
| { |
| this.it = it; |
| this.partitioner = partitioner; |
| this.totalBytes = totalBytes; |
| this.fileAccessLock = fileAccessLock; |
| } |
| |
| protected DecoratedKey computeNext() |
| { |
| if (fileAccessLock != null) |
| fileAccessLock.readLock().lock(); |
| try |
| { |
| if (!initialized) |
| { |
| initialized = true; |
| return it.isExhausted() |
| ? endOfData() |
| : partitioner.decorateKey(it.key()); |
| } |
| else |
| { |
| return it.advance() |
| ? partitioner.decorateKey(it.key()) |
| : endOfData(); |
| } |
| } |
| catch (IOException e) |
| { |
| throw new RuntimeException(e); |
| } |
| finally |
| { |
| if (fileAccessLock != null) |
| fileAccessLock.readLock().unlock(); |
| } |
| } |
| |
| public void close() |
| { |
| if (fileAccessLock != null) |
| fileAccessLock.writeLock().lock(); |
| try |
| { |
| it.close(); |
| } |
| finally |
| { |
| if (fileAccessLock != null) |
| fileAccessLock.writeLock().unlock(); |
| } |
| } |
| |
| public long getBytesRead() |
| { |
| if (fileAccessLock != null) |
| fileAccessLock.readLock().lock(); |
| try |
| { |
| return it.isExhausted() ? totalBytes : it.dataPosition(); |
| } |
| finally |
| { |
| if (fileAccessLock != null) |
| fileAccessLock.readLock().unlock(); |
| } |
| } |
| |
| public long getTotalBytes() |
| { |
| return totalBytes; |
| } |
| |
| } |