/**
* 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.kafka.common.requests;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.ProtoUtils;
import org.apache.kafka.common.protocol.types.Schema;
import org.apache.kafka.common.protocol.types.Struct;
import org.apache.kafka.common.utils.CollectionUtils;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* This wrapper supports both v0 and v1 of OffsetFetchRequest.
*/
public class OffsetFetchRequest extends AbstractRequestResponse {
public static Schema curSchema = ProtoUtils.currentRequestSchema(ApiKeys.OFFSET_FETCH.id);
private static String GROUP_ID_KEY_NAME = "group_id";
private static String TOPICS_KEY_NAME = "topics";
// topic level field names
private static String TOPIC_KEY_NAME = "topic";
private static String PARTITIONS_KEY_NAME = "partitions";
// partition level field names
private static String PARTITION_KEY_NAME = "partition";
public static final int DEFAULT_GENERATION_ID = -1;
public static final String DEFAULT_CONSUMER_ID = "";
private final String groupId;
private final List<TopicPartition> partitions;
public OffsetFetchRequest(String groupId, List<TopicPartition> partitions) {
super(new Struct(curSchema));
Map<String, List<Integer>> topicsData = CollectionUtils.groupDataByTopic(partitions);
struct.set(GROUP_ID_KEY_NAME, groupId);
List<Struct> topicArray = new ArrayList<Struct>();
for (Map.Entry<String, List<Integer>> entries: topicsData.entrySet()) {
Struct topicData = struct.instance(TOPICS_KEY_NAME);
topicData.set(TOPIC_KEY_NAME, entries.getKey());
List<Struct> partitionArray = new ArrayList<Struct>();
for (Integer partiitonId : entries.getValue()) {
Struct partitionData = topicData.instance(PARTITIONS_KEY_NAME);
partitionData.set(PARTITION_KEY_NAME, partiitonId);
partitionArray.add(partitionData);
}
topicData.set(PARTITIONS_KEY_NAME, partitionArray.toArray());
topicArray.add(topicData);
}
struct.set(TOPICS_KEY_NAME, topicArray.toArray());
this.groupId = groupId;
this.partitions = partitions;
}
public OffsetFetchRequest(Struct struct) {
super(struct);
partitions = new ArrayList<TopicPartition>();
for (Object topicResponseObj : struct.getArray(TOPICS_KEY_NAME)) {
Struct topicResponse = (Struct) topicResponseObj;
String topic = topicResponse.getString(TOPIC_KEY_NAME);
for (Object partitionResponseObj : topicResponse.getArray(PARTITIONS_KEY_NAME)) {
Struct partitionResponse = (Struct) partitionResponseObj;
int partition = partitionResponse.getInt(PARTITION_KEY_NAME);
partitions.add(new TopicPartition(topic, partition));
}
}
groupId = struct.getString(GROUP_ID_KEY_NAME);
}
public String groupId() {
return groupId;
}
public List<TopicPartition> partitions() {
return partitions;
}
public static OffsetFetchRequest parse(ByteBuffer buffer) {
return new OffsetFetchRequest(((Struct) curSchema.read(buffer)));
}
}