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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2010-2014 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.metrics.internal.cloudwatch;

import com.amazonaws.SDKGlobalConfiguration;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.metrics.AwsSdkMetrics;
import com.amazonaws.metrics.MetricCollector;
import com.amazonaws.regions.Regions;

/**
 * The default AWS SDK metric collector factory.  This class is instantiated
 * via reflection if the default AWS SDK metrics is enabled via the
 * system property {@link SDKGlobalConfiguration#DEFAULT_METRICS_SYSTEM_PROPERTY}.
 */
public class DefaultMetricCollectorFactory 
    implements MetricCollector.Factory {
    /**
     * Returns a instance of the Amazon CloudWatch request metric collector either by
     * starting up a new one or returning an existing one if it's already
     * started; null if any failure.
     */
    @Override
    public MetricCollector getInstance() {
        AWSCredentialsProvider provider = AwsSdkMetrics.getCredentialProvider();
        Regions region = AwsSdkMetrics.getRegion();
        Integer qSize = AwsSdkMetrics.getMetricQueueSize();
        Long timeoutMilli = AwsSdkMetrics.getQueuePollTimeoutMilli();
        CloudWatchMetricConfig config = new CloudWatchMetricConfig();
        if (provider != null)
            config.setCredentialsProvider(provider);
        if (region != null) {
            String endPoint = "monitoring." + region.getName() + ".amazonaws.com";
            config.setCloudWatchEndPoint(endPoint);
        }
        if (qSize != null)
            config.setMetricQueueSize(qSize.intValue());
        if (timeoutMilli != null)
            config.setQueuePollTimeoutMilli(timeoutMilli.longValue());
        MetricCollectorSupport.startSingleton(config);
        return MetricCollectorSupport.getInstance();
    }
}