com.rapleaf.hank.storage.curly.CurlyMerger.java Source code

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Here is the source code for com.rapleaf.hank.storage.curly.CurlyMerger.java

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/**
 *  Copyright 2011 Rapleaf
 *
 *  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 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 com.rapleaf.hank.storage.curly;

import com.rapleaf.hank.storage.PartitionRemoteFileOps;
import org.apache.commons.io.IOUtils;
import org.apache.log4j.Logger;

import java.io.*;
import java.util.List;

public class CurlyMerger implements ICurlyMerger {

    private static final Logger LOG = Logger.getLogger(CurlyMerger.class);

    @Override
    public long[] merge(final CurlyFilePath base, final List<String> deltaRemoteFiles,
            final PartitionRemoteFileOps partitionRemoteFileOps) throws IOException {
        long[] offsetAdjustments = new long[deltaRemoteFiles.size() + 1];
        offsetAdjustments[0] = 0;

        // Open the base in append mode
        File baseFile = new File(base.getPath());
        FileOutputStream baseFileOutputStream = new FileOutputStream(baseFile, true);
        OutputStream baseOutputStream = new BufferedOutputStream(baseFileOutputStream);
        try {
            // Loop over deltas and append them to the base in order, keeping track of offset adjustments
            long totalOffset = baseFile.length();
            int i = 1;
            for (String deltaRemoteFile : deltaRemoteFiles) {
                offsetAdjustments[i] = totalOffset;
                InputStream deltaRemoteInputStream = partitionRemoteFileOps.getInputStream(deltaRemoteFile);
                try {
                    LOG.info("Merging remote file " + deltaRemoteFile + " into file " + base.getPath());
                    long bytesCopied = IOUtils.copyLarge(deltaRemoteInputStream, baseOutputStream);
                    totalOffset += bytesCopied;
                } finally {
                    deltaRemoteInputStream.close();
                }
                i++;
            }
        } finally {
            // Close base streams
            baseOutputStream.close();
            baseFileOutputStream.close();
        }
        return offsetAdjustments;
    }
}