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RemoteBlockOutStream.java
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RemoteBlockOutStream.java
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/*
* Licensed to the University of California, Berkeley 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 tachyon.client.block;
import java.io.IOException;
import tachyon.client.RemoteBlockWriter;
import tachyon.client.ClientContext;
import tachyon.worker.WorkerClient;
/**
* Provides a streaming API to write to a Tachyon block. This output stream will send the write
* through a Tachyon worker which will then write the block to a file in Tachyon storage. The
* instances of this class should only be used by one thread and are not thread safe.
*/
public final class RemoteBlockOutStream extends BufferedBlockOutStream {
private final RemoteBlockWriter mRemoteWriter;
private final WorkerClient mWorkerClient;
/**
* Creates a new block output stream.
*
* @param blockId the block id
* @param blockSize the block size
* @throws IOException if I/O error occurs
*/
public RemoteBlockOutStream(long blockId, long blockSize) throws IOException {
super(blockId, blockSize);
mRemoteWriter = RemoteBlockWriter.Factory.createRemoteBlockWriter(ClientContext.getConf());
mWorkerClient = mContext.acquireWorkerClient();
mRemoteWriter.open(mWorkerClient.getDataServerAddress(), mBlockId, mWorkerClient.getUserId());
}
@Override
public void cancel() throws IOException {
if (mClosed) {
return;
}
mRemoteWriter.close();
mWorkerClient.cancelBlock(mBlockId);
mContext.releaseWorkerClient(mWorkerClient);
mClosed = true;
}
@Override
public void close() throws IOException {
if (mClosed) {
return;
}
flush();
mRemoteWriter.close();
if (mFlushedBytes == mBlockSize) {
mWorkerClient.cacheBlock(mBlockId);
} else {
mWorkerClient.cancelBlock(mBlockId);
}
mContext.releaseWorkerClient(mWorkerClient);
mClosed = true;
}
@Override
public void flush() throws IOException {
writeToRemoteBlock(mBuffer.array(), 0, mBuffer.position());
mBuffer.clear();
}
@Override
protected void unBufferedWrite(byte[] b, int off, int len) throws IOException {
writeToRemoteBlock(b, off, len);
}
private void writeToRemoteBlock(byte[] b, int off, int len) throws IOException {
mRemoteWriter.write(b, off, len);
mFlushedBytes += len;
}
}