hyracks/hyracks-dataflow-common/src/main/java/edu/uci/ics/hyracks/dataflow/common/io/RunFileWriter.java

/*
 * Copyright 2009-2010 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.dataflow.common.io;

import java.nio.ByteBuffer;

import edu.uci.ics.hyracks.api.comm.IFrameWriter;
import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
import edu.uci.ics.hyracks.api.io.FileReference;
import edu.uci.ics.hyracks.api.io.IFileHandle;
import edu.uci.ics.hyracks.api.io.IIOManager;

public class RunFileWriter implements IFrameWriter {
    private final FileReference file;
    private final IIOManager ioManager;
    private boolean failed;

    private IFileHandle handle;
    private long size;

    public RunFileWriter(FileReference file, IIOManager ioManager) {
        this.file = file;
        this.ioManager = ioManager;
    }

    @Override
    public void open() throws HyracksDataException {
        handle = ioManager.open(file, IIOManager.FileReadWriteMode.READ_WRITE,
                IIOManager.FileSyncMode.METADATA_ASYNC_DATA_ASYNC);
        size = 0;
        failed = false;
    }

    @Override
    public void fail() throws HyracksDataException {
        ioManager.close(handle);
        failed = true;
    }

    @Override
    public void nextFrame(ByteBuffer buffer) throws HyracksDataException {
        size += ioManager.syncWrite(handle, size, buffer);
    }

    @Override
    public void close() throws HyracksDataException {
        if (!failed) {
            ioManager.close(handle);
        }
    }

    public FileReference getFileReference() {
        return file;
    }

    public long getFileSize() {
        return size;
    }

    public RunFileReader createReader() throws HyracksDataException {
        if (failed) {
            throw new HyracksDataException("createReader() called on a failed RunFileWriter");
        }
        return new RunFileReader(file, ioManager, size);
    }
}