org.apache.pig.piggybank.squeal.backend.storm.state.PigSerializer.java Source code

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Here is the source code for org.apache.pig.piggybank.squeal.backend.storm.state.PigSerializer.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.pig.piggybank.squeal.backend.storm.state;

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;

import org.apache.hadoop.io.AbstractMapWritable;
import org.apache.hadoop.io.DataOutputBuffer;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.MapWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.join.TupleWritable;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.HDataType;
import org.apache.pig.data.DataType;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.apache.pig.impl.io.NullableBag;
import org.apache.pig.impl.io.NullableBooleanWritable;
import org.apache.pig.impl.io.NullableBytesWritable;
import org.apache.pig.impl.io.NullableDoubleWritable;
import org.apache.pig.impl.io.NullableFloatWritable;
import org.apache.pig.impl.io.NullableIntWritable;
import org.apache.pig.impl.io.NullableLongWritable;
import org.apache.pig.impl.io.NullableText;
import org.apache.pig.impl.io.NullableTuple;
import org.apache.pig.impl.io.PigNullableWritable;

import backtype.storm.tuple.Values;

import storm.trident.state.Serializer;

public class PigSerializer implements Serializer {

    @Override
    public byte[] serialize(Object o) {

        DataOutputBuffer dbuf = new DataOutputBuffer();

        try {
            if (o instanceof Values) {
                Values objl = (Values) o;
                dbuf.writeByte(0);
                // Write out the length.
                dbuf.writeInt(objl.size());

                // First, write the type.
                for (int i = 0; i < objl.size(); i++) {
                    PigNullableWritable pnw = (PigNullableWritable) objl.get(i);
                    dbuf.writeByte(HDataType.findTypeFromNullableWritable(pnw));
                    pnw.write(dbuf);
                }
            } else if (o instanceof Writable) {
                dbuf.writeByte(1);
                dbuf.writeUTF(o.getClass().getName());
                ((Writable) o).write(dbuf);
            } else {
                throw new RuntimeException("Unexpected type: " + o.getClass());
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return dbuf.getData();
    }

    @Override
    public Object deserialize(byte[] b) {

        ByteArrayInputStream bais = new ByteArrayInputStream(b);
        DataInputStream dis = new DataInputStream(bais);

        try {
            byte write_type = dis.readByte();
            Object ret = null;
            if (write_type == 0) {
                // Read the length.
                int values_size = dis.readInt();
                Values arr = new Values();

                for (int i = 0; i < values_size; i++) {
                    // First read the type
                    byte t = dis.readByte();
                    // Get a new instance of the appropriate object.
                    PigNullableWritable pnw = HDataType.getWritableComparableTypes(t).getClass().newInstance();
                    pnw.readFields(dis);
                    arr.add(pnw);
                }
                ret = arr;
            } else if (write_type == 1) {
                String cls = dis.readUTF();

                Writable c = (Writable) Class.forName(cls).newInstance();
                c.readFields(dis);
                ret = c;
            }

            return ret;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

}