GlobalPartitionInformation.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.trident;

import java.io.Serializable;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import com.google.common.base.Objects;

import org.apache.storm.kafka.Broker;
import org.apache.storm.kafka.Partition;

public class GlobalPartitionInformation implements Iterable<Partition>, Serializable {

  private static final long serialVersionUID = 625773127554875253L;
  private Map<Integer, Broker> partitionMap;
  public String myTopic;

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

  public GlobalPartitionInformation(String topic, Boolean bUseTopicNameForPartitionPathId) {
    this.myTopic = topic;
    this.partitionMap = new TreeMap<Integer, Broker>();
    this.bUseTopicNameForPartitionPathId = bUseTopicNameForPartitionPathId;
  }

  public GlobalPartitionInformation(String topic) {
    this.myTopic = topic;
    this.partitionMap = new TreeMap<Integer, Broker>();
    this.bUseTopicNameForPartitionPathId = false;
  }

  public void addPartition(int partitionId, Broker broker) {
    partitionMap.put(partitionId, broker);
  }

  public Boolean getbUseTopicNameForPartitionPathId() {
    return bUseTopicNameForPartitionPathId;
  }

  @Override
  public String toString() {
    return "GlobalPartitionInformation{ topic=" + myTopic + ", partitionMap=" + partitionMap + '}';
  }

  public Broker getBrokerFor(Integer partitionId) {
    return partitionMap.get(partitionId);
  }

  public List<Partition> getOrderedPartitions() {
    List<Partition> partitions = new LinkedList<Partition>();
    for (Map.Entry<Integer, Broker> partition : partitionMap.entrySet()) {
      partitions.add(new Partition(
          partition.getValue(),
          this.myTopic,
          partition.getKey(),
          this.bUseTopicNameForPartitionPathId));
    }
    return partitions;
  }

  public String getTopic() {
    return this.myTopic;
  }

  @Override
  public Iterator<Partition> iterator() {
    final Iterator<Map.Entry<Integer, Broker>> iterator = partitionMap.entrySet().iterator();
    final String topic = this.myTopic;
    final Boolean useTopicNameForPartitionPathId = this.bUseTopicNameForPartitionPathId;
    return new Iterator<Partition>() {
      @Override
      public boolean hasNext() {
        return iterator.hasNext();
      }

      @Override
      public Partition next() {
        Map.Entry<Integer, Broker> next = iterator.next();
        return new Partition(next.getValue(),
            topic,
            next.getKey(),
            useTopicNameForPartitionPathId);
      }

      @Override
      public void remove() {
        iterator.remove();
      }
    };
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(partitionMap);
  }

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