org.redisson.api.mapreduce.RCollectionMapper Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of redisson-all Show documentation

Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC

There is a newer version: 3.40.2

Show newest version

/**
 * Copyright (c) 2013-2024 Nikita Koksharov
 *
 * Licensed 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.redisson.api.mapreduce;

import java.io.Serializable;

/**
 * Mapper task invoked during map phase of MapReduce process and launched across Redisson Nodes.
 * Every task stores transformed result of input key and value into {@link RCollector} instance. 
 * Collected results are handled by {@link RReducer} instance once 
 * all Mapper tasks have finished.
 * 
 * @author Nikita Koksharov
 *
 * @param  input value
 * @param  output key
 * @param  output value
 */
public interface RCollectionMapper extends Serializable {

    /**
     * Invoked for each Collection source entry
     * 
     * @param value - input value
     * @param collector - instance shared across all Mapper tasks
     */
    void map(VIn value, RCollector collector);
    
}