/* * Copyright 2012-2017 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.cloudwatch; import static java.util.concurrent.Executors.newFixedThreadPool; import javax.annotation.Generated; import com.amazonaws.services.cloudwatch.model.*; import com.amazonaws.client.AwsAsyncClientParams; import com.amazonaws.annotation.ThreadSafe; import com.amazonaws.ClientConfiguration; import com.amazonaws.auth.AWSCredentials; import com.amazonaws.auth.AWSCredentialsProvider; import java.util.concurrent.ExecutorService; import com.amazonaws.auth.DefaultAWSCredentialsProviderChain; /** * Client for accessing CloudWatch asynchronously. Each asynchronous method will return a Java Future object * representing the asynchronous operation; overloads which accept an {@code AsyncHandler} can be used to receive * notification when an asynchronous operation completes. * <p> * <p> * Amazon CloudWatch monitors your Amazon Web Services (AWS) resources and the applications you run on AWS in real-time. * You can use CloudWatch to collect and track metrics, which are the variables you want to measure for your resources * and applications. * </p> * <p> * CloudWatch alarms send notifications or automatically make changes to the resources you are monitoring based on rules * that you define. For example, you can monitor the CPU usage and disk reads and writes of your Amazon Elastic Compute * Cloud (Amazon EC2) instances and then use this data to determine whether you should launch additional instances to * handle increased load. You can also use this data to stop under-used instances to save money. * </p> * <p> * In addition to monitoring the built-in metrics that come with AWS, you can monitor your own custom metrics. With * CloudWatch, you gain system-wide visibility into resource utilization, application performance, and operational * health. * </p> */ @ThreadSafe @Generated("com.amazonaws:aws-java-sdk-code-generator") public class AmazonCloudWatchAsyncClient extends AmazonCloudWatchClient implements AmazonCloudWatchAsync { private static final int DEFAULT_THREAD_POOL_SIZE = 50; private final java.util.concurrent.ExecutorService executorService; /** * Constructs a new asynchronous client to invoke service methods on CloudWatch. A credentials provider chain will * be used that searches for credentials in this order: * <ul> * <li>Environment Variables - AWS_ACCESS_KEY_ID and AWS_SECRET_KEY</li> * <li>Java System Properties - aws.accessKeyId and aws.secretKey</li> * <li>Credential profiles file at the default location (~/.aws/credentials) shared by all AWS SDKs and the AWS CLI</li> * <li>Instance profile credentials delivered through the Amazon EC2 metadata service</li> * </ul> * <p> * Asynchronous methods are delegated to a fixed-size thread pool containing 50 threads (to match the default * maximum number of concurrent connections to the service). * * @see com.amazonaws.auth.DefaultAWSCredentialsProviderChain * @see java.util.concurrent.Executors#newFixedThreadPool(int) * @deprecated use {@link AmazonCloudWatchAsyncClientBuilder#defaultClient()} */ @Deprecated public AmazonCloudWatchAsyncClient() { this(DefaultAWSCredentialsProviderChain.getInstance()); } /** * Constructs a new asynchronous client to invoke service methods on CloudWatch. A credentials provider chain will * be used that searches for credentials in this order: * <ul> * <li>Environment Variables - AWS_ACCESS_KEY_ID and AWS_SECRET_KEY</li> * <li>Java System Properties - aws.accessKeyId and aws.secretKey</li> * <li>Credential profiles file at the default location (~/.aws/credentials) shared by all AWS SDKs and the AWS CLI</li> * <li>Instance profile credentials delivered through the Amazon EC2 metadata service</li> * </ul> * <p> * Asynchronous methods are delegated to a fixed-size thread pool containing a number of threads equal to the * maximum number of concurrent connections configured via {@code ClientConfiguration.getMaxConnections()}. * * @param clientConfiguration * The client configuration options controlling how this client connects to CloudWatch (ex: proxy settings, * retry counts, etc). * * @see com.amazonaws.auth.DefaultAWSCredentialsProviderChain * @see java.util.concurrent.Executors#newFixedThreadPool(int) * @deprecated use {@link AmazonCloudWatchAsyncClientBuilder#withClientConfiguration(ClientConfiguration)} */ @Deprecated public AmazonCloudWatchAsyncClient(ClientConfiguration clientConfiguration) { this(DefaultAWSCredentialsProviderChain.getInstance(), clientConfiguration, newFixedThreadPool(clientConfiguration.getMaxConnections())); } /** * Constructs a new asynchronous client to invoke service methods on CloudWatch using the specified AWS account * credentials. * <p> * Asynchronous methods are delegated to a fixed-size thread pool containing 50 threads (to match the default * maximum number of concurrent connections to the service). * * @param awsCredentials * The AWS credentials (access key ID and secret key) to use when authenticating with AWS services. * @see java.util.concurrent.Executors#newFixedThreadPool(int) * @deprecated use {@link AmazonCloudWatchAsyncClientBuilder#withCredentials(AWSCredentialsProvider)} */ @Deprecated public AmazonCloudWatchAsyncClient(AWSCredentials awsCredentials) { this(awsCredentials, newFixedThreadPool(DEFAULT_THREAD_POOL_SIZE)); } /** * Constructs a new asynchronous client to invoke service methods on CloudWatch using the specified AWS account * credentials and executor service. Default client settings will be used. * * @param awsCredentials * The AWS credentials (access key ID and secret key) to use when authenticating with AWS services. * @param executorService * The executor service by which all asynchronous requests will be executed. * @deprecated use {@link AmazonCloudWatchAsyncClientBuilder#withCredentials(AWSCredentialsProvider)} and * {@link AmazonCloudWatchAsyncClientBuilder#withExecutorFactory(com.amazonaws.client.builder.ExecutorFactory)} */ @Deprecated public AmazonCloudWatchAsyncClient(AWSCredentials awsCredentials, ExecutorService executorService) { this(awsCredentials, configFactory.getConfig(), executorService); } /** * Constructs a new asynchronous client to invoke service methods on CloudWatch using the specified AWS account * credentials, executor service, and client configuration options. * * @param awsCredentials * The AWS credentials (access key ID and secret key) to use when authenticating with AWS services. * @param clientConfiguration * Client configuration options (ex: max retry limit, proxy settings, etc). * @param executorService * The executor service by which all asynchronous requests will be executed. * @deprecated use {@link AmazonCloudWatchAsyncClientBuilder#withCredentials(AWSCredentialsProvider)} and * {@link AmazonCloudWatchAsyncClientBuilder#withClientConfiguration(ClientConfiguration)} and * {@link AmazonCloudWatchAsyncClientBuilder#withExecutorFactory(com.amazonaws.client.builder.ExecutorFactory)} */ @Deprecated public AmazonCloudWatchAsyncClient(AWSCredentials awsCredentials, ClientConfiguration clientConfiguration, ExecutorService executorService) { super(awsCredentials, clientConfiguration); this.executorService = executorService; } /** * Constructs a new asynchronous client to invoke service methods on CloudWatch using the specified AWS account * credentials provider. Default client settings will be used. * <p> * Asynchronous methods are delegated to a fixed-size thread pool containing 50 threads (to match the default * maximum number of concurrent connections to the service). * * @param awsCredentialsProvider * The AWS credentials provider which will provide credentials to authenticate requests with AWS services. * @see java.util.concurrent.Executors#newFixedThreadPool(int) * @deprecated use {@link AmazonCloudWatchAsyncClientBuilder#withCredentials(AWSCredentialsProvider)} */ @Deprecated public AmazonCloudWatchAsyncClient(AWSCredentialsProvider awsCredentialsProvider) { this(awsCredentialsProvider, newFixedThreadPool(DEFAULT_THREAD_POOL_SIZE)); } /** * Constructs a new asynchronous client to invoke service methods on CloudWatch using the provided AWS account * credentials provider and client configuration options. * <p> * Asynchronous methods are delegated to a fixed-size thread pool containing a number of threads equal to the * maximum number of concurrent connections configured via {@code ClientConfiguration.getMaxConnections()}. * * @param awsCredentialsProvider * The AWS credentials provider which will provide credentials to authenticate requests with AWS services. * @param clientConfiguration * Client configuration options (ex: max retry limit, proxy settings, etc). * * @see com.amazonaws.auth.DefaultAWSCredentialsProviderChain * @see java.util.concurrent.Executors#newFixedThreadPool(int) * @deprecated use {@link AmazonCloudWatchAsyncClientBuilder#withCredentials(AWSCredentialsProvider)} and * {@link AmazonCloudWatchAsyncClientBuilder#withClientConfiguration(ClientConfiguration)} */ @Deprecated public AmazonCloudWatchAsyncClient(AWSCredentialsProvider awsCredentialsProvider, ClientConfiguration clientConfiguration) { this(awsCredentialsProvider, clientConfiguration, newFixedThreadPool(clientConfiguration.getMaxConnections())); } /** * Constructs a new asynchronous client to invoke service methods on CloudWatch using the specified AWS account * credentials provider and executor service. Default client settings will be used. * * @param awsCredentialsProvider * The AWS credentials provider which will provide credentials to authenticate requests with AWS services. * @param executorService * The executor service by which all asynchronous requests will be executed. * @deprecated use {@link AmazonCloudWatchAsyncClientBuilder#withCredentials(AWSCredentialsProvider)} and * {@link AmazonCloudWatchAsyncClientBuilder#withExecutorFactory(com.amazonaws.client.builder.ExecutorFactory)} */ @Deprecated public AmazonCloudWatchAsyncClient(AWSCredentialsProvider awsCredentialsProvider, ExecutorService executorService) { this(awsCredentialsProvider, configFactory.getConfig(), executorService); } /** * Constructs a new asynchronous client to invoke service methods on CloudWatch using the specified AWS account * credentials provider, executor service, and client configuration options. * * @param awsCredentialsProvider * The AWS credentials provider which will provide credentials to authenticate requests with AWS services. * @param clientConfiguration * Client configuration options (ex: max retry limit, proxy settings, etc). * @param executorService * The executor service by which all asynchronous requests will be executed. * @deprecated use {@link AmazonCloudWatchAsyncClientBuilder#withCredentials(AWSCredentialsProvider)} and * {@link AmazonCloudWatchAsyncClientBuilder#withClientConfiguration(ClientConfiguration)} and * {@link AmazonCloudWatchAsyncClientBuilder#withExecutorFactory(com.amazonaws.client.builder.ExecutorFactory)} */ @Deprecated public AmazonCloudWatchAsyncClient(AWSCredentialsProvider awsCredentialsProvider, ClientConfiguration clientConfiguration, ExecutorService executorService) { super(awsCredentialsProvider, clientConfiguration); this.executorService = executorService; } public static AmazonCloudWatchAsyncClientBuilder asyncBuilder() { return AmazonCloudWatchAsyncClientBuilder.standard(); } /** * Constructs a new asynchronous client to invoke service methods on CloudWatch using the specified parameters. * * @param asyncClientParams * Object providing client parameters. */ AmazonCloudWatchAsyncClient(AwsAsyncClientParams asyncClientParams) { super(asyncClientParams); this.executorService = asyncClientParams.getExecutor(); } /** * Returns the executor service used by this client to execute async requests. * * @return The executor service used by this client to execute async requests. */ public ExecutorService getExecutorService() { return executorService; } @Override public java.util.concurrent.Future<DeleteAlarmsResult> deleteAlarmsAsync(DeleteAlarmsRequest request) { return deleteAlarmsAsync(request, null); } @Override public java.util.concurrent.Future<DeleteAlarmsResult> deleteAlarmsAsync(final DeleteAlarmsRequest request, final com.amazonaws.handlers.AsyncHandler<DeleteAlarmsRequest, DeleteAlarmsResult> asyncHandler) { final DeleteAlarmsRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<DeleteAlarmsResult>() { @Override public DeleteAlarmsResult call() throws Exception { DeleteAlarmsResult result = null; try { result = executeDeleteAlarms(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } @Override public java.util.concurrent.Future<DescribeAlarmHistoryResult> describeAlarmHistoryAsync(DescribeAlarmHistoryRequest request) { return describeAlarmHistoryAsync(request, null); } @Override public java.util.concurrent.Future<DescribeAlarmHistoryResult> describeAlarmHistoryAsync(final DescribeAlarmHistoryRequest request, final com.amazonaws.handlers.AsyncHandler<DescribeAlarmHistoryRequest, DescribeAlarmHistoryResult> asyncHandler) { final DescribeAlarmHistoryRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<DescribeAlarmHistoryResult>() { @Override public DescribeAlarmHistoryResult call() throws Exception { DescribeAlarmHistoryResult result = null; try { result = executeDescribeAlarmHistory(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } /** * Simplified method form for invoking the DescribeAlarmHistory operation. * * @see #describeAlarmHistoryAsync(DescribeAlarmHistoryRequest) */ @Override public java.util.concurrent.Future<DescribeAlarmHistoryResult> describeAlarmHistoryAsync() { return describeAlarmHistoryAsync(new DescribeAlarmHistoryRequest()); } /** * Simplified method form for invoking the DescribeAlarmHistory operation with an AsyncHandler. * * @see #describeAlarmHistoryAsync(DescribeAlarmHistoryRequest, com.amazonaws.handlers.AsyncHandler) */ @Override public java.util.concurrent.Future<DescribeAlarmHistoryResult> describeAlarmHistoryAsync( com.amazonaws.handlers.AsyncHandler<DescribeAlarmHistoryRequest, DescribeAlarmHistoryResult> asyncHandler) { return describeAlarmHistoryAsync(new DescribeAlarmHistoryRequest(), asyncHandler); } @Override public java.util.concurrent.Future<DescribeAlarmsResult> describeAlarmsAsync(DescribeAlarmsRequest request) { return describeAlarmsAsync(request, null); } @Override public java.util.concurrent.Future<DescribeAlarmsResult> describeAlarmsAsync(final DescribeAlarmsRequest request, final com.amazonaws.handlers.AsyncHandler<DescribeAlarmsRequest, DescribeAlarmsResult> asyncHandler) { final DescribeAlarmsRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<DescribeAlarmsResult>() { @Override public DescribeAlarmsResult call() throws Exception { DescribeAlarmsResult result = null; try { result = executeDescribeAlarms(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } /** * Simplified method form for invoking the DescribeAlarms operation. * * @see #describeAlarmsAsync(DescribeAlarmsRequest) */ @Override public java.util.concurrent.Future<DescribeAlarmsResult> describeAlarmsAsync() { return describeAlarmsAsync(new DescribeAlarmsRequest()); } /** * Simplified method form for invoking the DescribeAlarms operation with an AsyncHandler. * * @see #describeAlarmsAsync(DescribeAlarmsRequest, com.amazonaws.handlers.AsyncHandler) */ @Override public java.util.concurrent.Future<DescribeAlarmsResult> describeAlarmsAsync( com.amazonaws.handlers.AsyncHandler<DescribeAlarmsRequest, DescribeAlarmsResult> asyncHandler) { return describeAlarmsAsync(new DescribeAlarmsRequest(), asyncHandler); } @Override public java.util.concurrent.Future<DescribeAlarmsForMetricResult> describeAlarmsForMetricAsync(DescribeAlarmsForMetricRequest request) { return describeAlarmsForMetricAsync(request, null); } @Override public java.util.concurrent.Future<DescribeAlarmsForMetricResult> describeAlarmsForMetricAsync(final DescribeAlarmsForMetricRequest request, final com.amazonaws.handlers.AsyncHandler<DescribeAlarmsForMetricRequest, DescribeAlarmsForMetricResult> asyncHandler) { final DescribeAlarmsForMetricRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<DescribeAlarmsForMetricResult>() { @Override public DescribeAlarmsForMetricResult call() throws Exception { DescribeAlarmsForMetricResult result = null; try { result = executeDescribeAlarmsForMetric(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } @Override public java.util.concurrent.Future<DisableAlarmActionsResult> disableAlarmActionsAsync(DisableAlarmActionsRequest request) { return disableAlarmActionsAsync(request, null); } @Override public java.util.concurrent.Future<DisableAlarmActionsResult> disableAlarmActionsAsync(final DisableAlarmActionsRequest request, final com.amazonaws.handlers.AsyncHandler<DisableAlarmActionsRequest, DisableAlarmActionsResult> asyncHandler) { final DisableAlarmActionsRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<DisableAlarmActionsResult>() { @Override public DisableAlarmActionsResult call() throws Exception { DisableAlarmActionsResult result = null; try { result = executeDisableAlarmActions(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } @Override public java.util.concurrent.Future<EnableAlarmActionsResult> enableAlarmActionsAsync(EnableAlarmActionsRequest request) { return enableAlarmActionsAsync(request, null); } @Override public java.util.concurrent.Future<EnableAlarmActionsResult> enableAlarmActionsAsync(final EnableAlarmActionsRequest request, final com.amazonaws.handlers.AsyncHandler<EnableAlarmActionsRequest, EnableAlarmActionsResult> asyncHandler) { final EnableAlarmActionsRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<EnableAlarmActionsResult>() { @Override public EnableAlarmActionsResult call() throws Exception { EnableAlarmActionsResult result = null; try { result = executeEnableAlarmActions(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } @Override public java.util.concurrent.Future<GetMetricStatisticsResult> getMetricStatisticsAsync(GetMetricStatisticsRequest request) { return getMetricStatisticsAsync(request, null); } @Override public java.util.concurrent.Future<GetMetricStatisticsResult> getMetricStatisticsAsync(final GetMetricStatisticsRequest request, final com.amazonaws.handlers.AsyncHandler<GetMetricStatisticsRequest, GetMetricStatisticsResult> asyncHandler) { final GetMetricStatisticsRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<GetMetricStatisticsResult>() { @Override public GetMetricStatisticsResult call() throws Exception { GetMetricStatisticsResult result = null; try { result = executeGetMetricStatistics(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } @Override public java.util.concurrent.Future<ListMetricsResult> listMetricsAsync(ListMetricsRequest request) { return listMetricsAsync(request, null); } @Override public java.util.concurrent.Future<ListMetricsResult> listMetricsAsync(final ListMetricsRequest request, final com.amazonaws.handlers.AsyncHandler<ListMetricsRequest, ListMetricsResult> asyncHandler) { final ListMetricsRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<ListMetricsResult>() { @Override public ListMetricsResult call() throws Exception { ListMetricsResult result = null; try { result = executeListMetrics(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } /** * Simplified method form for invoking the ListMetrics operation. * * @see #listMetricsAsync(ListMetricsRequest) */ @Override public java.util.concurrent.Future<ListMetricsResult> listMetricsAsync() { return listMetricsAsync(new ListMetricsRequest()); } /** * Simplified method form for invoking the ListMetrics operation with an AsyncHandler. * * @see #listMetricsAsync(ListMetricsRequest, com.amazonaws.handlers.AsyncHandler) */ @Override public java.util.concurrent.Future<ListMetricsResult> listMetricsAsync( com.amazonaws.handlers.AsyncHandler<ListMetricsRequest, ListMetricsResult> asyncHandler) { return listMetricsAsync(new ListMetricsRequest(), asyncHandler); } @Override public java.util.concurrent.Future<PutMetricAlarmResult> putMetricAlarmAsync(PutMetricAlarmRequest request) { return putMetricAlarmAsync(request, null); } @Override public java.util.concurrent.Future<PutMetricAlarmResult> putMetricAlarmAsync(final PutMetricAlarmRequest request, final com.amazonaws.handlers.AsyncHandler<PutMetricAlarmRequest, PutMetricAlarmResult> asyncHandler) { final PutMetricAlarmRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<PutMetricAlarmResult>() { @Override public PutMetricAlarmResult call() throws Exception { PutMetricAlarmResult result = null; try { result = executePutMetricAlarm(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } @Override public java.util.concurrent.Future<PutMetricDataResult> putMetricDataAsync(PutMetricDataRequest request) { return putMetricDataAsync(request, null); } @Override public java.util.concurrent.Future<PutMetricDataResult> putMetricDataAsync(final PutMetricDataRequest request, final com.amazonaws.handlers.AsyncHandler<PutMetricDataRequest, PutMetricDataResult> asyncHandler) { final PutMetricDataRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<PutMetricDataResult>() { @Override public PutMetricDataResult call() throws Exception { PutMetricDataResult result = null; try { result = executePutMetricData(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } @Override public java.util.concurrent.Future<SetAlarmStateResult> setAlarmStateAsync(SetAlarmStateRequest request) { return setAlarmStateAsync(request, null); } @Override public java.util.concurrent.Future<SetAlarmStateResult> setAlarmStateAsync(final SetAlarmStateRequest request, final com.amazonaws.handlers.AsyncHandler<SetAlarmStateRequest, SetAlarmStateResult> asyncHandler) { final SetAlarmStateRequest finalRequest = beforeClientExecution(request); return executorService.submit(new java.util.concurrent.Callable<SetAlarmStateResult>() { @Override public SetAlarmStateResult call() throws Exception { SetAlarmStateResult result = null; try { result = executeSetAlarmState(finalRequest); } catch (Exception ex) { if (asyncHandler != null) { asyncHandler.onError(ex); } throw ex; } if (asyncHandler != null) { asyncHandler.onSuccess(finalRequest, result); } return result; } }); } /** * Shuts down the client, releasing all managed resources. This includes forcibly terminating all pending * asynchronous service calls. Clients who wish to give pending asynchronous service calls time to complete should * call {@code getExecutorService().shutdown()} followed by {@code getExecutorService().awaitTermination()} prior to * calling this method. */ @Override public void shutdown() { super.shutdown(); executorService.shutdownNow(); } }