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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 2014-2016 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.event;

import com.amazonaws.event.request.Progress;
import com.amazonaws.event.request.ProgressSupport;

/**
 * Default implementation for progress tracking.
 */
public class ProgressTracker extends SyncProgressListener {
    public static final ProgressTracker NOOP = new ProgressTracker() {
        @Override public void progressChanged(ProgressEvent progressEvent) {}
    };

    private final Progress progress = new ProgressSupport();

    @Override
    public void progressChanged(ProgressEvent progressEvent) {
        long bytes = progressEvent.getBytes();
        if (bytes <= 0)
            return;
        switch (progressEvent.getEventType()) {
            case REQUEST_CONTENT_LENGTH_EVENT:
                progress.addRequestContentLength(bytes);
                break;
            case RESPONSE_CONTENT_LENGTH_EVENT:
                progress.addResponseContentLength(bytes);
                break;
            case REQUEST_BYTE_TRANSFER_EVENT:
                progress.addRequestBytesTransferred(bytes);
                break;
            case RESPONSE_BYTE_TRANSFER_EVENT:
                progress.addResponseBytesTransferred(bytes);
                break;
            case HTTP_REQUEST_CONTENT_RESET_EVENT:
                progress.addRequestBytesTransferred(0-bytes);
                break;
            case HTTP_RESPONSE_CONTENT_RESET_EVENT: 
            case RESPONSE_BYTE_DISCARD_EVENT: 
                progress.addResponseBytesTransferred(0-bytes);
                break;
            default:
                break;
        }
    }
    
    public Progress getProgress() { return progress; }
}