org.apache.crunch.impl.mr.run.CrunchInputSplit.java Source code

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Here is the source code for org.apache.crunch.impl.mr.run.CrunchInputSplit.java

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/**
 * 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.crunch.impl.mr.run;

import java.io.DataInput;
import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.IOException;

import org.apache.crunch.io.FormatBundle;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.serializer.Deserializer;
import org.apache.hadoop.io.serializer.SerializationFactory;
import org.apache.hadoop.io.serializer.Serializer;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.util.ReflectionUtils;

class CrunchInputSplit extends InputSplit implements Writable, Configurable {

    private InputSplit inputSplit;
    private int nodeIndex;
    private FormatBundle<? extends InputFormat<?, ?>> bundle;
    private Configuration conf;

    public CrunchInputSplit() {
        // default constructor
    }

    public CrunchInputSplit(InputSplit inputSplit, FormatBundle<? extends InputFormat<?, ?>> bundle, int nodeIndex,
            Configuration conf) {
        this.inputSplit = inputSplit;
        this.bundle = bundle;
        this.nodeIndex = nodeIndex;
        this.conf = conf;
    }

    @Override
    public void setConf(Configuration conf) {
        this.conf = conf;
        if (bundle != null && conf != null) {
            this.bundle.configure(conf);
        }
    }

    @Override
    public Configuration getConf() {
        return conf;
    }

    public int getNodeIndex() {
        return nodeIndex;
    }

    public InputSplit getInputSplit() {
        return inputSplit;
    }

    public Class<? extends InputFormat<?, ?>> getInputFormatClass() {
        return bundle.getFormatClass();
    }

    @Override
    public long getLength() throws IOException, InterruptedException {
        return inputSplit.getLength();
    }

    @Override
    public String[] getLocations() throws IOException, InterruptedException {
        return inputSplit.getLocations();
    }

    @Override
    public String toString() {
        return String.format("CrunchInputSplit(%s)", inputSplit);
    }

    public void readFields(DataInput in) throws IOException {
        nodeIndex = in.readInt();
        bundle = new FormatBundle();
        bundle.setConf(conf);
        bundle.readFields(in);
        bundle.configure(conf); // yay bootstrap!
        Class<? extends InputSplit> inputSplitClass = readClass(in);
        inputSplit = ReflectionUtils.newInstance(inputSplitClass, conf);
        SerializationFactory factory = new SerializationFactory(conf);
        Deserializer deserializer = factory.getDeserializer(inputSplitClass);
        deserializer.open((DataInputStream) in);
        inputSplit = (InputSplit) deserializer.deserialize(inputSplit);
    }

    public void write(DataOutput out) throws IOException {
        out.writeInt(nodeIndex);
        bundle.write(out);
        Text.writeString(out, inputSplit.getClass().getName());
        SerializationFactory factory = new SerializationFactory(conf);
        Serializer serializer = factory.getSerializer(inputSplit.getClass());
        serializer.open((DataOutputStream) out);
        serializer.serialize(inputSplit);
    }

    private Class readClass(DataInput in) throws IOException {
        String className = Text.readString(in);
        try {
            return conf.getClassByName(className);
        } catch (ClassNotFoundException e) {
            throw new RuntimeException("readObject can't find class", e);
        }
    }
}