kafka StopReplicaRequest 源码

kafka StopReplicaRequest 代码

文件路径：/clients/src/main/java/org/apache/kafka/common/requests/StopReplicaRequest.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.TopicPartition;
import org.apache.kafka.common.message.StopReplicaRequestData;
import org.apache.kafka.common.message.StopReplicaRequestData.StopReplicaPartitionState;
import org.apache.kafka.common.message.StopReplicaRequestData.StopReplicaPartitionV0;
import org.apache.kafka.common.message.StopReplicaRequestData.StopReplicaTopicV1;
import org.apache.kafka.common.message.StopReplicaRequestData.StopReplicaTopicState;
import org.apache.kafka.common.message.StopReplicaResponseData;
import org.apache.kafka.common.message.StopReplicaResponseData.StopReplicaPartitionError;
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.MappedIterator;
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 java.util.stream.Collectors;

public class StopReplicaRequest extends AbstractControlRequest {

    public static class Builder extends AbstractControlRequest.Builder<StopReplicaRequest> {
        private final boolean deletePartitions;
        private final List<StopReplicaTopicState> topicStates;

        public Builder(short version, int controllerId, int controllerEpoch, long brokerEpoch,
                       boolean deletePartitions, List<StopReplicaTopicState> topicStates) {
            super(ApiKeys.STOP_REPLICA, version, controllerId, controllerEpoch, brokerEpoch);
            this.deletePartitions = deletePartitions;
            this.topicStates = topicStates;
        }

        public StopReplicaRequest build(short version) {
            StopReplicaRequestData data = new StopReplicaRequestData()
                .setControllerId(controllerId)
                .setControllerEpoch(controllerEpoch)
                .setBrokerEpoch(brokerEpoch);

            if (version >= 3) {
                data.setTopicStates(topicStates);
            } else if (version >= 1) {
                data.setDeletePartitions(deletePartitions);
                List<StopReplicaTopicV1> topics = topicStates.stream().map(topic ->
                    new StopReplicaTopicV1()
                        .setName(topic.topicName())
                        .setPartitionIndexes(topic.partitionStates().stream()
                            .map(StopReplicaPartitionState::partitionIndex)
                            .collect(Collectors.toList())))
                    .collect(Collectors.toList());
                data.setTopics(topics);
            } else {
                data.setDeletePartitions(deletePartitions);
                List<StopReplicaPartitionV0> partitions = topicStates.stream().flatMap(topic ->
                    topic.partitionStates().stream().map(partition ->
                        new StopReplicaPartitionV0()
                            .setTopicName(topic.topicName())
                            .setPartitionIndex(partition.partitionIndex())))
                    .collect(Collectors.toList());
                data.setUngroupedPartitions(partitions);
            }

            return new StopReplicaRequest(data, version);
        }

        @Override
        public String toString() {
            StringBuilder bld = new StringBuilder();
            bld.append("(type=StopReplicaRequest").
                append(", controllerId=").append(controllerId).
                append(", controllerEpoch=").append(controllerEpoch).
                append(", brokerEpoch=").append(brokerEpoch).
                append(", deletePartitions=").append(deletePartitions).
                append(", topicStates=").append(Utils.join(topicStates, ",")).
                append(")");
            return bld.toString();
        }
    }

    private final StopReplicaRequestData data;

    private StopReplicaRequest(StopReplicaRequestData data, short version) {
        super(ApiKeys.STOP_REPLICA, version);
        this.data = data;
    }

    @Override
    public StopReplicaResponse getErrorResponse(int throttleTimeMs, Throwable e) {
        Errors error = Errors.forException(e);

        StopReplicaResponseData data = new StopReplicaResponseData();
        data.setErrorCode(error.code());

        List<StopReplicaPartitionError> partitions = new ArrayList<>();
        for (StopReplicaTopicState topic : topicStates()) {
            for (StopReplicaPartitionState partition : topic.partitionStates()) {
                partitions.add(new StopReplicaPartitionError()
                    .setTopicName(topic.topicName())
                    .setPartitionIndex(partition.partitionIndex())
                    .setErrorCode(error.code()));
            }
        }
        data.setPartitionErrors(partitions);

        return new StopReplicaResponse(data);
    }

    /**
     * Note that this method has allocation overhead per iterated element, so callers should copy the result into
     * another collection if they need to iterate more than once.
     *
     * Implementation note: we should strive to avoid allocation overhead per element, see
     * `UpdateMetadataRequest.partitionStates()` for the preferred approach. That's not possible in this case and
     * StopReplicaRequest should be relatively rare in comparison to other request types.
     */
    public Iterable<StopReplicaTopicState> topicStates() {
        if (version() < 1) {
            Map<String, StopReplicaTopicState> topicStates = new HashMap<>();
            for (StopReplicaPartitionV0 partition : data.ungroupedPartitions()) {
                StopReplicaTopicState topicState = topicStates.computeIfAbsent(partition.topicName(),
                    topic -> new StopReplicaTopicState().setTopicName(topic));
                topicState.partitionStates().add(new StopReplicaPartitionState()
                    .setPartitionIndex(partition.partitionIndex())
                    .setDeletePartition(data.deletePartitions()));
            }
            return topicStates.values();
        } else if (version() < 3) {
            return () -> new MappedIterator<>(data.topics().iterator(), topic ->
                new StopReplicaTopicState()
                    .setTopicName(topic.name())
                    .setPartitionStates(topic.partitionIndexes().stream()
                        .map(partition -> new StopReplicaPartitionState()
                            .setPartitionIndex(partition)
                            .setDeletePartition(data.deletePartitions()))
                        .collect(Collectors.toList())));
        } else {
            return data.topicStates();
        }
    }

    public Map<TopicPartition, StopReplicaPartitionState> partitionStates() {
        Map<TopicPartition, StopReplicaPartitionState> partitionStates = new HashMap<>();

        if (version() < 1) {
            for (StopReplicaPartitionV0 partition : data.ungroupedPartitions()) {
                partitionStates.put(
                    new TopicPartition(partition.topicName(), partition.partitionIndex()),
                    new StopReplicaPartitionState()
                        .setPartitionIndex(partition.partitionIndex())
                        .setDeletePartition(data.deletePartitions()));
            }
        } else if (version() < 3) {
            for (StopReplicaTopicV1 topic : data.topics()) {
                for (Integer partitionIndex : topic.partitionIndexes()) {
                    partitionStates.put(
                        new TopicPartition(topic.name(), partitionIndex),
                        new StopReplicaPartitionState()
                            .setPartitionIndex(partitionIndex)
                            .setDeletePartition(data.deletePartitions()));
                }
            }
        } else {
            for (StopReplicaTopicState topicState : data.topicStates()) {
                for (StopReplicaPartitionState partitionState: topicState.partitionStates()) {
                    partitionStates.put(
                        new TopicPartition(topicState.topicName(), partitionState.partitionIndex()),
                        partitionState);
                }
            }
        }

        return partitionStates;
    }

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

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

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

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

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

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