com.splicemachine.mrio.api.mapreduce.SMWrappedRecordReader.java Source code

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Here is the source code for com.splicemachine.mrio.api.mapreduce.SMWrappedRecordReader.java

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/*
 * Copyright 2012 - 2016 Splice Machine, Inc.
 *
 * 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.splicemachine.mrio.api.mapreduce;

import java.io.IOException;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.log4j.Logger;
import com.splicemachine.mrio.api.core.SMRecordReaderImpl;
import com.splicemachine.mrio.api.serde.ExecRowWritable;
import com.splicemachine.mrio.api.serde.RowLocationWritable;
import com.splicemachine.utils.SpliceLogUtils;

/**
 * 
 * Wrapper Class to Support Hive MR2 while deferring to Splice Machine's core MR format.
 * 
 *
 */
public class SMWrappedRecordReader extends RecordReader<RowLocationWritable, ExecRowWritable> {
    protected static final Logger LOG = Logger.getLogger(SMWrappedRecordReader.class);
    protected SMRecordReaderImpl delegate;
    protected RowLocationWritable key;
    protected ExecRowWritable value;

    public SMWrappedRecordReader(SMRecordReaderImpl reader) {
        if (LOG.isTraceEnabled())
            SpliceLogUtils.trace(LOG, "SMWrappedRecordReader with reader=%s", reader);
        this.delegate = reader;
        this.key = new RowLocationWritable();
        this.value = new ExecRowWritable(delegate.getExecRow());
    }

    @Override
    public void initialize(InputSplit split, TaskAttemptContext context) throws IOException, InterruptedException {
        delegate.initialize(split, context);
    }

    @Override
    public boolean nextKeyValue() throws IOException, InterruptedException {
        return delegate.nextKeyValue();
    }

    @Override
    public RowLocationWritable getCurrentKey() throws IOException, InterruptedException {
        key.set(delegate.getCurrentKey());
        return key;
    }

    @Override
    public ExecRowWritable getCurrentValue() throws IOException, InterruptedException {
        value.set(delegate.getCurrentValue());
        return value;
    }

    @Override
    public float getProgress() throws IOException, InterruptedException {
        return delegate.getProgress();
    }

    @Override
    public void close() throws IOException {
        delegate.close();
    }

}