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/*
* 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.protocol.ApiKeys;
import org.apache.kafka.common.protocol.Errors;
import org.apache.kafka.common.protocol.types.ArrayOf;
import org.apache.kafka.common.protocol.types.Field;
import org.apache.kafka.common.protocol.types.Schema;
import org.apache.kafka.common.protocol.types.Struct;
import org.apache.kafka.common.utils.Utils;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static org.apache.kafka.common.protocol.CommonFields.ERROR_CODE;
import static org.apache.kafka.common.protocol.CommonFields.GENERATION_ID;
import static org.apache.kafka.common.protocol.CommonFields.MEMBER_ID;
import static org.apache.kafka.common.protocol.CommonFields.THROTTLE_TIME_MS;
import static org.apache.kafka.common.protocol.types.Type.BYTES;
import static org.apache.kafka.common.protocol.types.Type.STRING;
public class JoinGroupResponse extends AbstractResponse {
private static final String GROUP_PROTOCOL_KEY_NAME = "group_protocol";
private static final String LEADER_ID_KEY_NAME = "leader_id";
private static final String MEMBERS_KEY_NAME = "members";
private static final String MEMBER_METADATA_KEY_NAME = "member_metadata";
private static final Schema JOIN_GROUP_RESPONSE_MEMBER_V0 = new Schema(
MEMBER_ID,
new Field(MEMBER_METADATA_KEY_NAME, BYTES));
private static final Schema JOIN_GROUP_RESPONSE_V0 = new Schema(
ERROR_CODE,
GENERATION_ID,
new Field(GROUP_PROTOCOL_KEY_NAME, STRING, "The group protocol selected by the coordinator"),
new Field(LEADER_ID_KEY_NAME, STRING, "The leader of the group"),
MEMBER_ID,
new Field(MEMBERS_KEY_NAME, new ArrayOf(JOIN_GROUP_RESPONSE_MEMBER_V0)));
private static final Schema JOIN_GROUP_RESPONSE_V1 = JOIN_GROUP_RESPONSE_V0;
private static final Schema JOIN_GROUP_RESPONSE_V2 = new Schema(
THROTTLE_TIME_MS,
ERROR_CODE,
GENERATION_ID,
new Field(GROUP_PROTOCOL_KEY_NAME, STRING, "The group protocol selected by the coordinator"),
new Field(LEADER_ID_KEY_NAME, STRING, "The leader of the group"),
MEMBER_ID,
new Field(MEMBERS_KEY_NAME, new ArrayOf(JOIN_GROUP_RESPONSE_MEMBER_V0)));
/**
* The version number is bumped to indicate that on quota violation brokers send out responses before throttling.
*/
private static final Schema JOIN_GROUP_RESPONSE_V3 = JOIN_GROUP_RESPONSE_V2;
/**
* The version number is bumped to indicate that client needs to issue a second join group request under first try
* with UNKNOWN_MEMBER_ID.
*/
private static final Schema JOIN_GROUP_RESPONSE_V4 = JOIN_GROUP_RESPONSE_V3;
public static Schema[] schemaVersions() {
return new Schema[] {JOIN_GROUP_RESPONSE_V0, JOIN_GROUP_RESPONSE_V1, JOIN_GROUP_RESPONSE_V2,
JOIN_GROUP_RESPONSE_V3, JOIN_GROUP_RESPONSE_V4};
}
public static final String UNKNOWN_PROTOCOL = "";
public static final int UNKNOWN_GENERATION_ID = -1;
public static final String UNKNOWN_MEMBER_ID = "";
/**
* Possible error codes:
*
* COORDINATOR_LOAD_IN_PROGRESS (14)
* GROUP_COORDINATOR_NOT_AVAILABLE (15)
* NOT_COORDINATOR (16)
* INCONSISTENT_GROUP_PROTOCOL (23)
* UNKNOWN_MEMBER_ID (25)
* INVALID_SESSION_TIMEOUT (26)
* GROUP_AUTHORIZATION_FAILED (30)
* MEMBER_ID_REQUIRED (79)
*/
private final int throttleTimeMs;
private final Errors error;
private final int generationId;
private final String groupProtocol;
private final String memberId;
private final String leaderId;
private final Map members;
public JoinGroupResponse(Errors error,
int generationId,
String groupProtocol,
String memberId,
String leaderId,
Map groupMembers) {
this(DEFAULT_THROTTLE_TIME, error, generationId, groupProtocol, memberId, leaderId, groupMembers);
}
public JoinGroupResponse(int throttleTimeMs,
Errors error,
int generationId,
String groupProtocol,
String memberId,
String leaderId,
Map groupMembers) {
this.throttleTimeMs = throttleTimeMs;
this.error = error;
this.generationId = generationId;
this.groupProtocol = groupProtocol;
this.memberId = memberId;
this.leaderId = leaderId;
this.members = groupMembers;
}
public JoinGroupResponse(Struct struct) {
this.throttleTimeMs = struct.getOrElse(THROTTLE_TIME_MS, DEFAULT_THROTTLE_TIME);
members = new HashMap<>();
for (Object memberDataObj : struct.getArray(MEMBERS_KEY_NAME)) {
Struct memberData = (Struct) memberDataObj;
String memberId = memberData.get(MEMBER_ID);
ByteBuffer memberMetadata = memberData.getBytes(MEMBER_METADATA_KEY_NAME);
members.put(memberId, memberMetadata);
}
error = Errors.forCode(struct.get(ERROR_CODE));
generationId = struct.get(GENERATION_ID);
groupProtocol = struct.getString(GROUP_PROTOCOL_KEY_NAME);
memberId = struct.get(MEMBER_ID);
leaderId = struct.getString(LEADER_ID_KEY_NAME);
}
@Override
public int throttleTimeMs() {
return throttleTimeMs;
}
public Errors error() {
return error;
}
@Override
public Map errorCounts() {
return errorCounts(error);
}
public int generationId() {
return generationId;
}
public String groupProtocol() {
return groupProtocol;
}
public String memberId() {
return memberId;
}
public String leaderId() {
return leaderId;
}
public boolean isLeader() {
return memberId.equals(leaderId);
}
public Map members() {
return members;
}
public static JoinGroupResponse parse(ByteBuffer buffer, short version) {
return new JoinGroupResponse(ApiKeys.JOIN_GROUP.parseResponse(version, buffer));
}
@Override
protected Struct toStruct(short version) {
Struct struct = new Struct(ApiKeys.JOIN_GROUP.responseSchema(version));
struct.setIfExists(THROTTLE_TIME_MS, throttleTimeMs);
struct.set(ERROR_CODE, error.code());
struct.set(GENERATION_ID, generationId);
struct.set(GROUP_PROTOCOL_KEY_NAME, groupProtocol);
struct.set(MEMBER_ID, memberId);
struct.set(LEADER_ID_KEY_NAME, leaderId);
List memberArray = new ArrayList<>();
for (Map.Entry entries : members.entrySet()) {
Struct memberData = struct.instance(MEMBERS_KEY_NAME);
memberData.set(MEMBER_ID, entries.getKey());
memberData.set(MEMBER_METADATA_KEY_NAME, entries.getValue());
memberArray.add(memberData);
}
struct.set(MEMBERS_KEY_NAME, memberArray.toArray());
return struct;
}
@Override
public String toString() {
return "JoinGroupResponse" +
"(throttleTimeMs=" + throttleTimeMs +
", error=" + error +
", generationId=" + generationId +
", groupProtocol=" + groupProtocol +
", memberId=" + memberId +
", leaderId=" + leaderId +
", members=" + ((members == null) ? "null" :
Utils.join(members.keySet(), ",")) + ")";
}
@Override
public boolean shouldClientThrottle(short version) {
return version >= 3;
}
}
