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The AWS SDK for Java with support for OSGi. The AWS 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 2010-2016 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.metrics.internal.cloudwatch;

import java.util.concurrent.BlockingQueue;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.amazonaws.services.cloudwatch.AmazonCloudWatchClient;
import com.amazonaws.services.cloudwatch.model.MetricDatum;
import com.amazonaws.services.cloudwatch.model.PutMetricDataRequest;
import com.amazonaws.util.VersionInfoUtils;

/**
 * A internal daemon thread used to upload request metrics to Amazon CloudWatch.
 */
class MetricUploaderThread extends Thread {
    private static final String USER_AGENT = MetricUploaderThread.class.getName() + "/" + VersionInfoUtils.getVersion();
    private static final String THREAD_NAME = "java-sdk-metric-uploader";
    private volatile boolean cancelled;
    private final AmazonCloudWatchClient cloudwatchClient;
    private final Log log = LogFactory.getLog(getClass());
    private final BlockingRequestBuilder qIterator;

    MetricUploaderThread(CloudWatchMetricConfig config,
            BlockingQueue queue) {
        this(config,
             queue,
             createCloudWatchClient(config));
    }

    private static AmazonCloudWatchClient createCloudWatchClient(
            CloudWatchMetricConfig config) {
        AmazonCloudWatchClient amazonCloudWatchClient = null;
        if (config.getCredentialsProvider() == null && config.getClientConfiguration() == null) {
            amazonCloudWatchClient = new AmazonCloudWatchClient();
        } else if (config.getCredentialsProvider() != null && config.getClientConfiguration() == null) {
            amazonCloudWatchClient = new AmazonCloudWatchClient(config.getCredentialsProvider());
        } else if (config.getClientConfiguration() != null && config.getCredentialsProvider() == null) {
            amazonCloudWatchClient = new AmazonCloudWatchClient(config.getClientConfiguration());
        } else if (config.getClientConfiguration() != null && config.getCredentialsProvider() != null) {
            amazonCloudWatchClient = new AmazonCloudWatchClient(config.getCredentialsProvider(),
                    config.getClientConfiguration());
        }
        return amazonCloudWatchClient;
    }


    MetricUploaderThread(CloudWatchMetricConfig config,
        BlockingQueue queue,
        AmazonCloudWatchClient client)
    {
        super(THREAD_NAME);
        if (config == null || queue == null) {
            throw new IllegalArgumentException();
        }
        this.cloudwatchClient = client;
        this.qIterator = new BlockingRequestBuilder(config, queue);
        String endpoint = config.getCloudWatchEndPoint();
        if (endpoint != null)
            cloudwatchClient.setEndpoint(endpoint);
        this.setPriority(MIN_PRIORITY);
        setDaemon(true);
    }

    @Override
    public void run() {
        while (!cancelled) {
            try {
                Iterable requests = qIterator.nextUploadUnits();
                for (PutMetricDataRequest req: requests) {
                    appendUserAgent(req);
                    log.debug(req);
                    cloudwatchClient.putMetricData(req);
                    Thread.yield();
                }
            } catch(InterruptedException e) {
                if (!cancelled) {
                    log.debug("Unexpected interruption ignored");
                }
            } catch(Throwable t) {
                log.warn("Unexpected condition; soldier on", t);
                Thread.yield();
            }
        }
    }

    void cancel() { cancelled = true; }

    public AmazonCloudWatchClient getCloudwatchClient() {
        return cloudwatchClient;
    }

    private void appendUserAgent(PutMetricDataRequest request) {
        request.getRequestClientOptions().appendUserAgent(USER_AGENT);
    }

}