hyracks/hyracks-hdfs/hyracks-hdfs-core/src/main/java/edu/uci/ics/hyracks/hdfs/api/ITupleWriter.java

/*
 * Copyright 2009-2012 by The Regents of the University of California
 * Licensed 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 from
 *
 *     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 edu.uci.ics.hyracks.hdfs.api;

import java.io.DataOutput;

import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference;

/**
 * Users need to implement this interface to use the HDFSWriteOperatorDescriptor.
 */
public interface ITupleWriter {

    /**
     * Initialize the the tuple writer.
     * 
     * @param output
     *            The channel for output data.
     * @throws HyracksDataException
     */
    public void open(DataOutput output) throws HyracksDataException;

    /**
     * Write the tuple to the DataOutput.
     * 
     * @param output
     *            the DataOutput channel
     * @param tuple
     *            the tuple to write
     * @throws HyracksDataException
     */
    public void write(DataOutput output, ITupleReference tuple) throws HyracksDataException;

    /**
     * Close the writer.
     * 
     * @param output
     *            The channel for output data.
     * @throws HyracksDataException
     */
    public void close(DataOutput output) throws HyracksDataException;

}