kafka StatefulProcessorNode 源码

kafka StatefulProcessorNode 代码

文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/graph/StatefulProcessorNode.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.streams.kstream.internals.graph;

import org.apache.kafka.streams.kstream.internals.KTableValueGetterSupplier;
import org.apache.kafka.streams.processor.internals.InternalTopologyBuilder;
import org.apache.kafka.streams.state.StoreBuilder;

import java.util.Arrays;
import java.util.Set;
import java.util.stream.Stream;

public class StatefulProcessorNode<K, V> extends ProcessorGraphNode<K, V> {

    private final String[] storeNames;
    private final StoreBuilder<?> storeBuilder;

    /**
     * Create a node representing a stateful processor, where the named stores have already been registered.
     */
    public StatefulProcessorNode(final ProcessorParameters<K, V, ?, ?> processorParameters,
                                 final Set<StoreBuilder<?>> preRegisteredStores,
                                 final Set<KTableValueGetterSupplier<?, ?>> valueGetterSuppliers) {
        super(processorParameters.processorName(), processorParameters);
        final Stream<String> registeredStoreNames = preRegisteredStores.stream().map(StoreBuilder::name);
        final Stream<String> valueGetterStoreNames = valueGetterSuppliers.stream().flatMap(s -> Arrays.stream(s.storeNames()));
        storeNames = Stream.concat(registeredStoreNames, valueGetterStoreNames).toArray(String[]::new);
        storeBuilder = null;
    }

    /**
     * Create a node representing a stateful processor, where the named stores have already been registered.
     */
    public StatefulProcessorNode(final String nodeName,
                                 final ProcessorParameters<K, V, ?, ?> processorParameters,
                                 final String[] storeNames) {
        super(nodeName, processorParameters);

        this.storeNames = storeNames;
        this.storeBuilder = null;
    }


    /**
     * Create a node representing a stateful processor,
     * where the store needs to be built and registered as part of building this node.
     */
    public StatefulProcessorNode(final String nodeName,
                                 final ProcessorParameters<K, V, ?, ?> processorParameters,
                                 final StoreBuilder<?> materializedKTableStoreBuilder) {
        super(nodeName, processorParameters);

        this.storeNames = null;
        this.storeBuilder = materializedKTableStoreBuilder;
    }

    @Override
    public String toString() {
        return "StatefulProcessorNode{" +
            "storeNames=" + Arrays.toString(storeNames) +
            ", storeBuilder=" + storeBuilder +
            "} " + super.toString();
    }

    @Override
    public void writeToTopology(final InternalTopologyBuilder topologyBuilder) {
        processorParameters().addProcessorTo(topologyBuilder, parentNodeNames());

        if (storeNames != null && storeNames.length > 0) {
            topologyBuilder.connectProcessorAndStateStores(processorParameters().processorName(), storeNames);
        }

        if (storeBuilder != null) {
            topologyBuilder.addStateStore(storeBuilder, processorParameters().processorName());
        }
    }
}

相关信息

kafka 源码目录

相关文章

kafka BaseJoinProcessorNode 源码

kafka BaseRepartitionNode 源码

kafka GlobalStoreNode 源码

kafka GraphGraceSearchUtil 源码

kafka GraphNode 源码

kafka GroupedTableOperationRepartitionNode 源码

kafka KTableKTableJoinNode 源码

kafka OptimizableRepartitionNode 源码

kafka ProcessorGraphNode 源码

kafka ProcessorParameters 源码