PakhomovAlexander commented on code in PR #5456: URL: https://github.com/apache/ignite-3/pull/5456#discussion_r2010254264
########## examples/src/main/java/org/apache/ignite/example/compute/ComputeAsyncExample.java: ########## @@ -0,0 +1,155 @@ +/* + * 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.ignite.example.compute; + +import static java.util.concurrent.CompletableFuture.completedFuture; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.List; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.ExecutionException; +import java.util.stream.Collectors; +import org.apache.ignite.client.IgniteClient; +import org.apache.ignite.compute.ComputeJob; +import org.apache.ignite.compute.IgniteCompute; +import org.apache.ignite.compute.JobDescriptor; +import org.apache.ignite.compute.JobExecutionContext; +import org.apache.ignite.compute.JobTarget; +import org.apache.ignite.deployment.DeploymentUnit; + +/** + * This example demonstrates the usage of the + * {@link IgniteCompute#executeAsync(JobTarget, JobDescriptor, Object)} API. + * + * <p>Find instructions on how to run the example in the README.md file located in the "examples" directory root. + * + * <p>The following steps related to code deployment should be additionally executed before running the current example: + * <ol> + * <li> + * Build "ignite-examples-x.y.z.jar" using the next command:<br> + * {@code ./gradlew :ignite-examples:jar} + * </li> + * <li> + * Create a new deployment unit using the CLI tool:<br> + * {@code cluster unit deploy computeExampleUnit \ + * --version 1.0.0 \ + * --path=$IGNITE_HOME/examples/build/libs/ignite-examples-x.y.z.jar} + * </li> + * </ol> + */ +public class ComputeAsyncExample { + /** Deployment unit name. */ + private static final String DEPLOYMENT_UNIT_NAME = "computeExampleUnit"; + + /** Deployment unit version. */ + private static final String DEPLOYMENT_UNIT_VERSION = "1.0.0"; + + /** + * Main method of the example. + * + * @param args The command line arguments. + */ + public static void main(String[] args) throws ExecutionException, InterruptedException { + //-------------------------------------------------------------------------------------- + // + // Creating a client to connect to the cluster. + // + //-------------------------------------------------------------------------------------- + + System.out.println("\nConnecting to server..."); + + try (IgniteClient client = IgniteClient.builder() + .addresses("127.0.0.1:10800") + .build() + ) { + //-------------------------------------------------------------------------------------- + // + // Configuring compute job. + // + //-------------------------------------------------------------------------------------- + + System.out.println("\nConfiguring compute job..."); + + JobDescriptor<String, Integer> job = JobDescriptor.builder(WordLengthJob.class) + .units(new DeploymentUnit(DEPLOYMENT_UNIT_NAME, DEPLOYMENT_UNIT_VERSION)) + .build(); + + JobTarget jobTarget = JobTarget.anyNode(client.clusterNodes()); + + //-------------------------------------------------------------------------------------- + // + // Iterating through all words in the sentence and creating compute jobs. + // + //-------------------------------------------------------------------------------------- + + Collection<CompletableFuture<Integer>> jobFutures = new ArrayList<>(); + + String phrase = "Count characters using compute job"; + + for (String word : phrase.split(" ")) { + //-------------------------------------------------------------------------------------- + // + // Executing compute job using configured jobTarget. + // + //-------------------------------------------------------------------------------------- + + System.out.println("\nExecuting compute job for word '" + word + "'..."); + + CompletableFuture<Integer> jobFuture = client.compute().executeAsync(jobTarget, job, word); + + jobFutures.add(jobFuture); + } + + //-------------------------------------------------------------------------------------- + // + // Waiting for the compute jobs to be completed. + // + //-------------------------------------------------------------------------------------- + + List<Integer> results = jobFutures.stream() + .map(CompletableFuture::join) + .collect(Collectors.toList()); + + int sum = results.stream().mapToInt(i -> i).sum(); + + //-------------------------------------------------------------------------------------- + // + // Printing the result. + // + //-------------------------------------------------------------------------------------- Review Comment: These comments are crazy, aren't they? 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