com.tinkerpop.gremlin.giraph.process.computer.util.KryoWritable Maven / Gradle / Ivy

Go to download
package com.tinkerpop.gremlin.giraph.process.computer.util;

import com.tinkerpop.gremlin.util.Serializer;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.WritableUtils;

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

/**
 * @author Marko A. Rodriguez (http://markorodriguez.com)
 */
public class KryoWritable implements WritableComparable {

    T t;

    public KryoWritable() {
    }

    public KryoWritable(final T t) {
        this();
        this.t = t;
    }

    public T get() {
        return this.t;
    }

    public void set(final T t) {
        this.t = t;
    }

    @Override
    public String toString() {
        return this.t.toString();
    }

    @Override
    public void readFields(final DataInput input) throws IOException {
        final int objectLength = WritableUtils.readVInt(input);
        final byte[] objectBytes = new byte[objectLength];
        for (int i = 0; i < objectLength; i++) {
            objectBytes[i] = input.readByte();
        }
        try {
            this.t = (T) Serializer.deserializeObject(objectBytes);
        } catch (final ClassNotFoundException e) {
            throw new IOException(e.getMessage(), e);
        }
        // TODO: Get Kryo to work
        //final Input in = new Input(new ByteArrayInputStream(objectBytes));
        //this.t = (T) Constants.KRYO.readClassAndObject(in);
        //in.close();
    }

    @Override
    public void write(final DataOutput output) throws IOException {
        final byte[] objectBytes = Serializer.serializeObject(this.t);
        WritableUtils.writeVInt(output, objectBytes.length);
        output.write(objectBytes);
        // TODO: Get Kryo to work
        //final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        //final Output out = new Output(outputStream);
        //Constants.KRYO.writeClassAndObject(out, this.t);
        //out.flush();
        //out.close();

    }

    @Override
    public int compareTo(final KryoWritable kryoWritable) {
        return this.t instanceof Comparable ? ((Comparable) this.t).compareTo(kryoWritable.get()) : 1;
    }
}