Partition.java

/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.storm.kafka;

import java.io.Serializable;

import com.google.common.base.Objects;

import org.apache.storm.trident.spout.ISpoutPartition;


public class Partition implements ISpoutPartition, Serializable {

  private static final long serialVersionUID = -2736013313278877399L;
  public Broker host;
  public int partition;
  public String topic;

  //Flag to keep the Partition Path Id backward compatible with Old implementation of
  // Partition.getId() == "partition_" + partition
  private Boolean bUseTopicNameForPartitionPathId;

  // for kryo compatibility
  private Partition() {

  }

  public Partition(Broker host, String topic, int partition) {
    this.topic = topic;
    this.host = host;
    this.partition = partition;
    this.bUseTopicNameForPartitionPathId = false;
  }

  public Partition(Broker host, String topic,
                   int partition, Boolean bUseTopicNameForPartitionPathId) {
    this.topic = topic;
    this.host = host;
    this.partition = partition;
    this.bUseTopicNameForPartitionPathId = bUseTopicNameForPartitionPathId;
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(host, topic, partition);
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null || getClass() != obj.getClass()) {
      return false;
    }
    final Partition other = (Partition) obj;
    return Objects.equal(this.host, other.host)
        && Objects.equal(this.topic, other.topic)
        && Objects.equal(this.partition, other.partition);
  }

  @Override
  public String toString() {
    return "Partition{ host=" + host + ", topic=" + topic + ", partition=" + partition + '}';
  }

  @Override
  public String getId() {
    if (bUseTopicNameForPartitionPathId) {
      return topic + "/partition_" + partition;
    } else {
      //Keep the Partition Id backward compatible with Old implementation of
      // Partition.getId() == "partition_" + partition
      return "partition_" + partition;
    }
  }

}