| /* |
| * 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.carbondata.core.writer; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| import org.apache.carbondata.core.datastore.impl.FileFactory; |
| import org.apache.carbondata.core.fileoperations.AtomicFileOperationFactory; |
| import org.apache.carbondata.core.fileoperations.AtomicFileOperations; |
| import org.apache.carbondata.core.fileoperations.FileWriteOperation; |
| import org.apache.carbondata.core.util.CarbonUtil; |
| |
| import org.apache.thrift.TBase; |
| import org.apache.thrift.TException; |
| import org.apache.thrift.protocol.TCompactProtocol; |
| import org.apache.thrift.protocol.TProtocol; |
| import org.apache.thrift.transport.TIOStreamTransport; |
| |
| /** |
| * Simple class that makes it easy to write Thrift objects to disk. |
| */ |
| public class ThriftWriter { |
| |
| /** |
| * buffer size |
| */ |
| private static final int bufferSize = 2048; |
| |
| /** |
| * File to write to. |
| */ |
| private String fileName; |
| |
| /** |
| * For writing to the file. |
| */ |
| private DataOutputStream dataOutputStream; |
| |
| /** |
| * For binary serialization of objects. |
| */ |
| private TProtocol binaryOut; |
| |
| /** |
| * Identifier for performing atomic file operations |
| */ |
| private AtomicFileOperations atomicFileOperationsWriter; |
| |
| /** |
| * flag to append to existing file |
| */ |
| private boolean append; |
| |
| /** |
| * Constructor. |
| */ |
| public ThriftWriter(String fileName, boolean append) { |
| this.fileName = fileName; |
| this.append = append; |
| } |
| |
| /** |
| * Open the file for writing. |
| */ |
| public void open() throws IOException { |
| dataOutputStream = FileFactory.getDataOutputStream(fileName, bufferSize, append); |
| binaryOut = new TCompactProtocol(new TIOStreamTransport(dataOutputStream)); |
| } |
| |
| /** |
| * Method for opening file writing for atomic operations |
| * |
| * @param fileWriteOperation |
| * @throws IOException |
| */ |
| public void open(FileWriteOperation fileWriteOperation) throws IOException { |
| atomicFileOperationsWriter = AtomicFileOperationFactory.getAtomicFileOperations(fileName); |
| dataOutputStream = atomicFileOperationsWriter.openForWrite(fileWriteOperation); |
| binaryOut = new TCompactProtocol(new TIOStreamTransport(dataOutputStream)); |
| } |
| |
| /** |
| * This will check whether stream and binary out is open or not. |
| * @return |
| */ |
| public boolean isOpen() { |
| if (null != binaryOut && null != dataOutputStream) { |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Write the object to disk. |
| */ |
| public void write(TBase t) throws IOException { |
| try { |
| t.write(binaryOut); |
| dataOutputStream.flush(); |
| } catch (TException e) { |
| throw new IOException(e); |
| } |
| } |
| |
| /** |
| * Close the file stream. |
| */ |
| public void close() throws IOException { |
| closeAtomicFileWriter(); |
| CarbonUtil.closeStream(dataOutputStream); |
| } |
| |
| /** |
| * This method will close the atomic file operations writer |
| * |
| * @throws IOException |
| */ |
| private void closeAtomicFileWriter() throws IOException { |
| if (null != atomicFileOperationsWriter) { |
| atomicFileOperationsWriter.close(); |
| // set output stream to null as atomic writer will close the data output stream internally |
| dataOutputStream = null; |
| } |
| } |
| } |