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The AWS Java SDK for Amazon EMR module holds the client classes that are used for communicating with Amazon Elastic MapReduce Service

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/*
 * Copyright 2011-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"). You may not
 * use this file except in compliance with the License. A copy of the License is
 * located at
 * 
 * http://aws.amazon.com/apache2.0
 * 
 * or in the "license" file accompanying this file. This file 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 com.amazonaws.services.elasticmapreduce.waiters;

import com.amazonaws.annotation.SdkInternalApi;
import com.amazonaws.services.elasticmapreduce.AmazonElasticMapReduce;
import com.amazonaws.services.elasticmapreduce.model.*;
import com.amazonaws.waiters.*;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class AmazonElasticMapReduceWaiters {

    /**
     * Represents the service client
     */
    private final AmazonElasticMapReduce client;

    private final ExecutorService executorService = Executors
            .newFixedThreadPool(50);

    /**
     * Constructs a new AmazonElasticMapReduceWaiters with the given client
     * 
     * @param client
     *        Service client
     */
    @SdkInternalApi
    public AmazonElasticMapReduceWaiters(AmazonElasticMapReduce client) {
        this.client = client;
    }

    /**
     * Builds a ClusterRunning waiter by using custom parameters
     * waiterParameters and other parameters defined in the waiters
     * specification, and then polls until it determines whether the resource
     * entered the desired state or not, where polling criteria is bound by
     * either default polling strategy or custom polling strategy.
     */
    public Waiter clusterRunning() {

        return new WaiterBuilder()
                .withSdkFunction(new DescribeClusterFunction(client))
                .withAcceptors(new ClusterRunning.IsRUNNINGMatcher(),
                        new ClusterRunning.IsWAITINGMatcher(),
                        new ClusterRunning.IsTERMINATINGMatcher(),
                        new ClusterRunning.IsTERMINATEDMatcher(),
                        new ClusterRunning.IsTERMINATED_WITH_ERRORSMatcher())
                .withDefaultPollingStrategy(
                        new PollingStrategy(new MaxAttemptsRetryStrategy(60),
                                new FixedDelayStrategy(30)))
                .withExecutorService(executorService).build();
    }

    /**
     * Builds a StepComplete waiter by using custom parameters waiterParameters
     * and other parameters defined in the waiters specification, and then polls
     * until it determines whether the resource entered the desired state or
     * not, where polling criteria is bound by either default polling strategy
     * or custom polling strategy.
     */
    public Waiter stepComplete() {

        return new WaiterBuilder()
                .withSdkFunction(new DescribeStepFunction(client))
                .withAcceptors(new StepComplete.IsCOMPLETEDMatcher(),
                        new StepComplete.IsFAILEDMatcher(),
                        new StepComplete.IsCANCELLEDMatcher())
                .withDefaultPollingStrategy(
                        new PollingStrategy(new MaxAttemptsRetryStrategy(60),
                                new FixedDelayStrategy(30)))
                .withExecutorService(executorService).build();
    }

}