//snippet-sourcedescription:[ListMetrics.java demonstrates how to list CloudWatch metrics.]
//snippet-keyword:[SDK for Java 2.0]
//snippet-keyword:[Code Sample]
//snippet-service:[cloudwatch]
//snippet-sourcetype:[full-example]
//snippet-sourcedate:[]
//snippet-sourceauthor:[soo-aws]

/*
 * Copyright 2010-2019 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.example.cloudwatch;

// snippet-start:[cloudwatch.java2.list_metrics.complete]
// snippet-start:[cloudwatch.java2.list_metrics.import]
import software.amazon.awssdk.services.cloudwatch.CloudWatchClient;
import software.amazon.awssdk.services.cloudwatch.model.ListMetricsRequest;
import software.amazon.awssdk.services.cloudwatch.model.ListMetricsResponse;
import software.amazon.awssdk.services.cloudwatch.model.Metric;
// snippet-end:[cloudwatch.java2.list_metrics.import]
/**
 * Lists CloudWatch metrics
 */

public class ListMetrics {

    public static void main(String[] args) {

        final String USAGE =
                "To run this example, supply a metric namespace\n" +
                        "Ex: ListMetrics <metric-namespace>\n";

        if (args.length != 1) {
            System.out.println(USAGE);
            System.exit(1);
        }

        String namespace = args[0];

        // snippet-start:[cloudwatch.java2.list_metrics.main]
        CloudWatchClient cw =
                CloudWatchClient.builder().build();

        boolean done = false;
        String nextToken = null;

        while(!done) {

            ListMetricsResponse response;

            if (nextToken == null) {
                ListMetricsRequest request = ListMetricsRequest.builder()
                        .namespace(namespace)
                        .build();

                response = cw.listMetrics(request);
            } else {
                ListMetricsRequest request = ListMetricsRequest.builder()
                        .namespace(namespace)
                        .nextToken(nextToken)
                        .build();

                response = cw.listMetrics(request);
            }

            for (Metric metric : response.metrics()) {
                System.out.printf(
                        "Retrieved metric %s", metric.metricName());
                System.out.println();
            }

            if(response.nextToken() == null) {
                done = true;
            } else {
                nextToken = response.nextToken();
            }
        }
        // snippet-end:[cloudwatch.java2.list_metrics.main]
    }
}
// snippet-end:[cloudwatch.java2.list_metrics.complete]

@@ -276,18 +276,23 @@
 uthor:%5Bs
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@@ -320,10 +320,10 @@
 0-20
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Update ListMetrics.java