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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.services.s3.metrics;

import com.amazonaws.metrics.ServiceMetricType;
import com.amazonaws.metrics.SimpleMetricType;
import com.amazonaws.metrics.ThroughputMetricType;
import com.amazonaws.services.s3.internal.Constants;

/**
 * S3 specific service metrics in the form of "simulated enum". The name of
 * every enum literal defined in this class must all start with "S3" in order
 * for the default AWS SDK metric collection system to recognize it as a
 * predefined S3 metrics.
 */
public class S3ServiceMetric extends SimpleMetricType implements ServiceMetricType {
    static final String SERVICE_NAME_PREFIX = "S3";

    /**
     * Returns a metric name by concatenating the service name prefix with the
     * given suffix.
     */
    private static final String metricName(String suffix) {
        return SERVICE_NAME_PREFIX + suffix;
    }

    public static final S3ThroughputMetric S3DownloadThroughput = new S3ThroughputMetric(
            metricName(DOWNLOAD_THROUGHPUT_NAME_SUFFIX)) {
        @Override
        public ServiceMetricType getByteCountMetricType() {
            return S3DownloadByteCount;
        }
    };
    public static final S3ServiceMetric S3DownloadByteCount = new S3ServiceMetric(
            metricName(DOWNLOAD_BYTE_COUNT_NAME_SUFFIX));
    public static final S3ThroughputMetric S3UploadThroughput = new S3ThroughputMetric(
            metricName(UPLOAD_THROUGHPUT_NAME_SUFFIX)) {
        @Override
        public ServiceMetricType getByteCountMetricType() {
            return S3UploadByteCount;
        }
    };
    public static final S3ServiceMetric S3UploadByteCount = new S3ServiceMetric(
            metricName(UPLOAD_BYTE_COUNT_NAME_SUFFIX));
    private static final S3ServiceMetric[] values = {
        S3DownloadThroughput,
        S3DownloadByteCount,
        S3UploadThroughput,
        S3UploadByteCount
    };

    private final String name;
    private S3ServiceMetric(String name) { this.name = name; }
    @Override public String name() { return name; }
    @Override public String getServiceName() {
        return Constants.S3_SERVICE_NAME;
    }

    private static abstract class S3ThroughputMetric extends S3ServiceMetric
            implements ThroughputMetricType {
        private S3ThroughputMetric(String name) {
            super(name);
        }
    };

    public static S3ServiceMetric[] values() { return values.clone(); }
    public static S3ServiceMetric valueOf(String name) {
        for (S3ServiceMetric e: values()) {
            if (e.name().equals(name)) {
                return e;
            }
        }
        throw new IllegalArgumentException("No S3ServiceMetric defined for the name "+ name);
    }
}