content: /*
   * 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;
  import org.apache.thrift.transport.TTransportException;
  
  /**
   * 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);
      try {
        binaryOut = new TCompactProtocol(new TIOStreamTransport(dataOutputStream));
      } catch (TTransportException e) {
        throw new IOException(e);
      }
    }
  
    /**
     * 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);
      try {
        binaryOut = new TCompactProtocol(new TIOStreamTransport(dataOutputStream));
      } catch (TTransportException e) {
        throw new IOException(e);
      }
    }
  
    /**
     * This will check whether stream and binary out is open or not.
     * @return
     */
    public boolean isOpen() {
      return null != binaryOut && null != dataOutputStream;
    }
  
    /**
     * 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;
      }
    }
  }
  