/**
* 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 java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.kafka.common.Cluster;
import org.apache.kafka.common.Node;
import org.apache.kafka.common.PartitionInfo;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.Errors;
import org.apache.kafka.common.protocol.ProtoUtils;
import org.apache.kafka.common.protocol.types.Schema;
import org.apache.kafka.common.protocol.types.Struct;
public class MetadataResponse extends AbstractRequestResponse {
private static Schema curSchema = ProtoUtils.currentResponseSchema(ApiKeys.METADATA.id);
private static String BROKERS_KEY_NAME = "brokers";
private static String TOPIC_METATDATA_KEY_NAME = "topic_metadata";
// broker level field names
private static String NODE_ID_KEY_NAME = "node_id";
private static String HOST_KEY_NAME = "host";
private static String PORT_KEY_NAME = "port";
// topic level field names
private static String TOPIC_ERROR_CODE_KEY_NAME = "topic_error_code";
private static String TOPIC_KEY_NAME = "topic";
private static String PARTITION_METADATA_KEY_NAME = "partition_metadata";
// partition level field names
private static String PARTITION_ERROR_CODE_KEY_NAME = "partition_error_code";
private static String PARTITION_KEY_NAME = "partition_id";
private static String LEADER_KEY_NAME = "leader";
private static String REPLICAS_KEY_NAME = "replicas";
private static String ISR_KEY_NAME = "isr";
private final Cluster cluster;
private final Map<String, Errors> errors;
public MetadataResponse(Cluster cluster) {
super(new Struct(curSchema));
List<Struct> brokerArray = new ArrayList<Struct>();
for (Node node: cluster.nodes()) {
Struct broker = struct.instance(BROKERS_KEY_NAME);
broker.set(NODE_ID_KEY_NAME, node.id());
broker.set(HOST_KEY_NAME, node.host());
broker.set(PORT_KEY_NAME, node.port());
brokerArray.add(broker);
}
struct.set(BROKERS_KEY_NAME, brokerArray.toArray());
List<Struct> topicArray = new ArrayList<Struct>();
for (String topic: cluster.topics()) {
Struct topicData = struct.instance(TOPIC_METATDATA_KEY_NAME);
topicData.set(TOPIC_ERROR_CODE_KEY_NAME, (short)0); // no error
topicData.set(TOPIC_KEY_NAME, topic);
List<Struct> partitionArray = new ArrayList<Struct>();
for (PartitionInfo fetchPartitionData : cluster.partitionsForTopic(topic)) {
Struct partitionData = topicData.instance(PARTITION_METADATA_KEY_NAME);
partitionData.set(PARTITION_ERROR_CODE_KEY_NAME, (short)0); // no error
partitionData.set(PARTITION_KEY_NAME, fetchPartitionData.partition());
partitionData.set(LEADER_KEY_NAME, fetchPartitionData.leader().id());
ArrayList<Integer> replicas = new ArrayList<Integer>();
for (Node node: fetchPartitionData.replicas())
replicas.add(node.id());
partitionData.set(REPLICAS_KEY_NAME, replicas.toArray());
ArrayList<Integer> isr = new ArrayList<Integer>();
for (Node node: fetchPartitionData.inSyncReplicas())
isr.add(node.id());
partitionData.set(ISR_KEY_NAME, isr.toArray());
partitionArray.add(partitionData);
}
topicData.set(PARTITION_METADATA_KEY_NAME, partitionArray.toArray());
topicArray.add(topicData);
}
struct.set(TOPIC_METATDATA_KEY_NAME, topicArray.toArray());
this.cluster = cluster;
this.errors = new HashMap<String, Errors>();
}
public MetadataResponse(Struct struct) {
super(struct);
Map<String, Errors> errors = new HashMap<String, Errors>();
Map<Integer, Node> brokers = new HashMap<Integer, Node>();
Object[] brokerStructs = (Object[]) struct.get(BROKERS_KEY_NAME);
for (int i = 0; i < brokerStructs.length; i++) {
Struct broker = (Struct) brokerStructs[i];
int nodeId = broker.getInt(NODE_ID_KEY_NAME);
String host = broker.getString(HOST_KEY_NAME);
int port = broker.getInt(PORT_KEY_NAME);
brokers.put(nodeId, new Node(nodeId, host, port));
}
List<PartitionInfo> partitions = new ArrayList<PartitionInfo>();
Object[] topicInfos = (Object[]) struct.get(TOPIC_METATDATA_KEY_NAME);
for (int i = 0; i < topicInfos.length; i++) {
Struct topicInfo = (Struct) topicInfos[i];
short topicError = topicInfo.getShort(TOPIC_ERROR_CODE_KEY_NAME);
String topic = topicInfo.getString(TOPIC_KEY_NAME);
if (topicError == Errors.NONE.code()) {
Object[] partitionInfos = (Object[]) topicInfo.get(PARTITION_METADATA_KEY_NAME);
for (int j = 0; j < partitionInfos.length; j++) {
Struct partitionInfo = (Struct) partitionInfos[j];
int partition = partitionInfo.getInt(PARTITION_KEY_NAME);
int leader = partitionInfo.getInt(LEADER_KEY_NAME);
Node leaderNode = leader == -1 ? null : brokers.get(leader);
Object[] replicas = (Object[]) partitionInfo.get(REPLICAS_KEY_NAME);
Node[] replicaNodes = new Node[replicas.length];
for (int k = 0; k < replicas.length; k++)
replicaNodes[k] = brokers.get(replicas[k]);
Object[] isr = (Object[]) partitionInfo.get(ISR_KEY_NAME);
Node[] isrNodes = new Node[isr.length];
for (int k = 0; k < isr.length; k++)
isrNodes[k] = brokers.get(isr[k]);
partitions.add(new PartitionInfo(topic, partition, leaderNode, replicaNodes, isrNodes));
}
} else {
errors.put(topic, Errors.forCode(topicError));
}
}
this.errors = errors;
this.cluster = new Cluster(brokers.values(), partitions);
}
public Map<String, Errors> errors() {
return this.errors;
}
public Cluster cluster() {
return this.cluster;
}
public static MetadataResponse parse(ByteBuffer buffer) {
return new MetadataResponse(((Struct) curSchema.read(buffer)));
}
}