kafka LeaderAndIsrRequest 源码

  • 2022-10-20
  • 浏览 (464)

kafka LeaderAndIsrRequest 代码

文件路径:/clients/src/main/java/org/apache/kafka/common/requests/LeaderAndIsrRequest.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
 *
 *    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.Node;
import org.apache.kafka.common.Uuid;
import org.apache.kafka.common.message.LeaderAndIsrRequestData;
import org.apache.kafka.common.message.LeaderAndIsrRequestData.LeaderAndIsrLiveLeader;
import org.apache.kafka.common.message.LeaderAndIsrRequestData.LeaderAndIsrTopicState;
import org.apache.kafka.common.message.LeaderAndIsrRequestData.LeaderAndIsrPartitionState;
import org.apache.kafka.common.message.LeaderAndIsrResponseData;
import org.apache.kafka.common.message.LeaderAndIsrResponseData.LeaderAndIsrTopicError;
import org.apache.kafka.common.message.LeaderAndIsrResponseData.LeaderAndIsrPartitionError;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.ByteBufferAccessor;
import org.apache.kafka.common.protocol.Errors;
import org.apache.kafka.common.utils.FlattenedIterator;
import org.apache.kafka.common.utils.Utils;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class LeaderAndIsrRequest extends AbstractControlRequest {

    public static class Builder extends AbstractControlRequest.Builder<LeaderAndIsrRequest> {

        private final List<LeaderAndIsrPartitionState> partitionStates;
        private final Map<String, Uuid> topicIds;
        private final Collection<Node> liveLeaders;

        public Builder(short version, int controllerId, int controllerEpoch, long brokerEpoch,
                       List<LeaderAndIsrPartitionState> partitionStates, Map<String, Uuid> topicIds,
                       Collection<Node> liveLeaders) {
            super(ApiKeys.LEADER_AND_ISR, version, controllerId, controllerEpoch, brokerEpoch);
            this.partitionStates = partitionStates;
            this.topicIds = topicIds;
            this.liveLeaders = liveLeaders;
        }

        @Override
        public LeaderAndIsrRequest build(short version) {
            List<LeaderAndIsrLiveLeader> leaders = liveLeaders.stream().map(n -> new LeaderAndIsrLiveLeader()
                .setBrokerId(n.id())
                .setHostName(n.host())
                .setPort(n.port())
            ).collect(Collectors.toList());

            LeaderAndIsrRequestData data = new LeaderAndIsrRequestData()
                .setControllerId(controllerId)
                .setControllerEpoch(controllerEpoch)
                .setBrokerEpoch(brokerEpoch)
                .setLiveLeaders(leaders);

            if (version >= 2) {
                Map<String, LeaderAndIsrTopicState> topicStatesMap = groupByTopic(partitionStates, topicIds);
                data.setTopicStates(new ArrayList<>(topicStatesMap.values()));
            } else {
                data.setUngroupedPartitionStates(partitionStates);
            }

            return new LeaderAndIsrRequest(data, version);
        }

        private static Map<String, LeaderAndIsrTopicState> groupByTopic(List<LeaderAndIsrPartitionState> partitionStates, Map<String, Uuid> topicIds) {
            Map<String, LeaderAndIsrTopicState> topicStates = new HashMap<>();
            // We don't null out the topic name in LeaderAndIsrRequestPartition since it's ignored by
            // the generated code if version >= 2
            for (LeaderAndIsrPartitionState partition : partitionStates) {
                LeaderAndIsrTopicState topicState = topicStates.computeIfAbsent(partition.topicName(), t -> new LeaderAndIsrTopicState()
                                .setTopicName(partition.topicName())
                                .setTopicId(topicIds.getOrDefault(partition.topicName(), Uuid.ZERO_UUID)));
                topicState.partitionStates().add(partition);
            }
            return topicStates;
        }

        @Override
        public String toString() {
            StringBuilder bld = new StringBuilder();
            bld.append("(type=LeaderAndIsRequest")
                .append(", controllerId=").append(controllerId)
                .append(", controllerEpoch=").append(controllerEpoch)
                .append(", brokerEpoch=").append(brokerEpoch)
                .append(", partitionStates=").append(partitionStates)
                .append(", topicIds=").append(topicIds)
                .append(", liveLeaders=(").append(Utils.join(liveLeaders, ", ")).append(")")
                .append(")");
            return bld.toString();

        }
    }

    private final LeaderAndIsrRequestData data;

    LeaderAndIsrRequest(LeaderAndIsrRequestData data, short version) {
        super(ApiKeys.LEADER_AND_ISR, version);
        this.data = data;
        // Do this from the constructor to make it thread-safe (even though it's only needed when some methods are called)
        normalize();
    }

    private void normalize() {
        if (version() >= 2) {
            for (LeaderAndIsrTopicState topicState : data.topicStates()) {
                for (LeaderAndIsrPartitionState partitionState : topicState.partitionStates()) {
                    // Set the topic name so that we can always present the ungrouped view to callers
                    partitionState.setTopicName(topicState.topicName());
                }
            }
        }
    }

    @Override
    public LeaderAndIsrResponse getErrorResponse(int throttleTimeMs, Throwable e) {
        LeaderAndIsrResponseData responseData = new LeaderAndIsrResponseData();
        Errors error = Errors.forException(e);
        responseData.setErrorCode(error.code());

        if (version() < 5) {
            List<LeaderAndIsrPartitionError> partitions = new ArrayList<>();
            for (LeaderAndIsrPartitionState partition : partitionStates()) {
                partitions.add(new LeaderAndIsrPartitionError()
                        .setTopicName(partition.topicName())
                        .setPartitionIndex(partition.partitionIndex())
                        .setErrorCode(error.code()));
            }
            responseData.setPartitionErrors(partitions);
        } else {
            for (LeaderAndIsrTopicState topicState : data.topicStates()) {
                List<LeaderAndIsrPartitionError> partitions = new ArrayList<>(
                    topicState.partitionStates().size());
                for (LeaderAndIsrPartitionState partition : topicState.partitionStates()) {
                    partitions.add(new LeaderAndIsrPartitionError()
                        .setPartitionIndex(partition.partitionIndex())
                        .setErrorCode(error.code()));
                }
                responseData.topics().add(new LeaderAndIsrTopicError()
                    .setTopicId(topicState.topicId())
                    .setPartitionErrors(partitions));
            }
        }

        return new LeaderAndIsrResponse(responseData, version());
    }

    @Override
    public int controllerId() {
        return data.controllerId();
    }

    @Override
    public int controllerEpoch() {
        return data.controllerEpoch();
    }

    @Override
    public long brokerEpoch() {
        return data.brokerEpoch();
    }

    public Iterable<LeaderAndIsrPartitionState> partitionStates() {
        if (version() >= 2)
            return () -> new FlattenedIterator<>(data.topicStates().iterator(),
                topicState -> topicState.partitionStates().iterator());
        return data.ungroupedPartitionStates();
    }

    public Map<String, Uuid> topicIds() {
        return data.topicStates().stream()
                .collect(Collectors.toMap(LeaderAndIsrTopicState::topicName, LeaderAndIsrTopicState::topicId));
    }

    public List<LeaderAndIsrLiveLeader> liveLeaders() {
        return Collections.unmodifiableList(data.liveLeaders());
    }

    @Override
    public LeaderAndIsrRequestData data() {
        return data;
    }

    public static LeaderAndIsrRequest parse(ByteBuffer buffer, short version) {
        return new LeaderAndIsrRequest(new LeaderAndIsrRequestData(new ByteBufferAccessor(buffer), version), version);
    }
}

相关信息

kafka 源码目录

相关文章

kafka AbstractControlRequest 源码

kafka AbstractRequest 源码

kafka AbstractRequestResponse 源码

kafka AbstractResponse 源码

kafka AddOffsetsToTxnRequest 源码

kafka AddOffsetsToTxnResponse 源码

kafka AddPartitionsToTxnRequest 源码

kafka AddPartitionsToTxnResponse 源码

kafka AllocateProducerIdsRequest 源码

kafka AllocateProducerIdsResponse 源码

0  赞