com.inmobi.databus.partition.PartitionCheckpoint.java Source code

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Here is the source code for com.inmobi.databus.partition.PartitionCheckpoint.java

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package com.inmobi.databus.partition;

/*
 * #%L
 * messaging-client-databus
 * %%
 * Copyright (C) 2012 - 2014 InMobi
 * %%
 * 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.
 * #L%
 */

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

import com.inmobi.databus.files.HadoopStreamFile;
import org.apache.hadoop.io.Writable;

import com.inmobi.databus.files.StreamFile;
import com.inmobi.messaging.consumer.InvalidCheckpointException;
import com.inmobi.messaging.consumer.databus.MessageCheckpoint;

public class PartitionCheckpoint implements Writable, MessageCheckpoint {
    private StreamFile streamFile;
    private long lineNum;

    public PartitionCheckpoint(StreamFile streamFile, long lineNum) {
        this.streamFile = streamFile;
        this.lineNum = lineNum;
    }

    public PartitionCheckpoint(DataInput in) throws IOException {
        readFields(in);
    }

    public String getFileName() {
        return streamFile.toString();
    }

    public String getName() {
        if (streamFile instanceof HadoopStreamFile)
            return ((HadoopStreamFile) streamFile).getFileName();
        else
            return getFileName();
    }

    public StreamFile getStreamFile() {
        return streamFile;
    }

    public long getLineNum() {
        return lineNum;
    }

    @Override
    public boolean isNULL() {
        return false;
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        String streamFileClassName = in.readUTF();
        Class<?> clazz;
        try {
            clazz = Class.forName(streamFileClassName);
            streamFile = (StreamFile) clazz.newInstance();
        } catch (Exception e) {
            throw new InvalidCheckpointException("Invalid stream file class", e);
        }
        streamFile.readFields(in);
        lineNum = in.readLong();
    }

    @Override
    public void write(DataOutput out) throws IOException {
        out.writeUTF(streamFile.getClass().getCanonicalName());
        streamFile.write(out);
        out.writeLong(lineNum);
    }

    public String toString() {
        return streamFile + "-" + lineNum;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((streamFile == null) ? 0 : streamFile.hashCode());
        result = prime * result + (int) (lineNum ^ (lineNum >>> 32));
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        PartitionCheckpoint other = (PartitionCheckpoint) obj;
        if (streamFile == null) {
            if (other.streamFile != null) {
                return false;
            }
        } else if (!streamFile.equals(other.streamFile)) {
            return false;
        }
        if (lineNum != other.lineNum) {
            return false;
        }
        return true;
    }

}