/**
* 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 com.alibaba.jstorm.kafka;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import backtype.storm.task.TopologyContext;
public class PartitionCoordinator {
private KafkaSpoutConfig config;
private Map<Integer, PartitionConsumer> partitionConsumerMap;
private List<PartitionConsumer> partitionConsumers;
private ZkState zkState;
public PartitionCoordinator(Map conf, KafkaSpoutConfig config, TopologyContext context, ZkState zkState) {
this.config = config;
this.zkState = zkState;
partitionConsumers = new LinkedList<PartitionConsumer>();
createPartitionConsumers(conf, context);
}
private void createPartitionConsumers(Map conf, TopologyContext context) {
partitionConsumerMap = new HashMap<Integer, PartitionConsumer>();
int taskSize = context.getComponentTasks(context.getThisComponentId()).size();
for(int i=context.getThisTaskIndex(); i<config.numPartitions; i+=taskSize) {
PartitionConsumer partitionConsumer = new PartitionConsumer(conf, config, i, zkState);
partitionConsumers.add(partitionConsumer);
partitionConsumerMap.put(i, partitionConsumer);
}
}
public List<PartitionConsumer> getPartitionConsumers() {
return partitionConsumers;
}
public PartitionConsumer getConsumer(int partition) {
return partitionConsumerMap.get(partition);
}
public void removeConsumer(int partition) {
PartitionConsumer partitionConsumer = partitionConsumerMap.get(partition);
partitionConsumers.remove(partitionConsumer);
partitionConsumerMap.remove(partition);
}
}