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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 2013-2016 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.internal;

import java.io.IOException;
import java.io.InputStream;

import com.amazonaws.util.AWSRequestMetrics.Field;
import com.amazonaws.util.AWSRequestMetrics;

/**
 * Record input stream read time into {@link AWSRequestMetrics} under metric type
 * HttpSocketReadTime;
 */
public class MetricsInputStream extends DelegateInputStream {

    private AWSRequestMetrics metrics;

    public MetricsInputStream(InputStream in) {
        super(in);
    }

    public void setMetrics(AWSRequestMetrics metrics) {
        this.metrics = metrics;
    }

    /**
     * {@inheritDoc}
     * Record the read time into the metrics.
     */
    @Override
    public int read() throws IOException {
        if (metrics != null) {
            metrics.startEvent(Field.HttpSocketReadTime);
        }
        try {
            return in.read();
        } finally {
            if (metrics != null) {
                metrics.endEvent(Field.HttpSocketReadTime);
            }
        }
    }

    /**
     * {@inheritDoc}
     *
     * Record the read time into the metrics.
     */
    @Override
    public int read(byte b[]) throws IOException {
        if (metrics != null) {
            metrics.startEvent(Field.HttpSocketReadTime);
        }
        try {
            return in.read(b);
        } finally {
            if (metrics != null) {
                metrics.endEvent(Field.HttpSocketReadTime);
            }
        }
    }

    /**
     * {@inheritDoc}
     *
     * Record the read time into the metrics.
     */
    @Override
    public int read(byte b[], int off, int len) throws IOException {
        if (metrics != null) {
            metrics.startEvent(Field.HttpSocketReadTime);
        }
        try {
            return in.read(b, off, len);
        } finally {
            if (metrics != null) {
                metrics.endEvent(Field.HttpSocketReadTime);
            }
        }
    }
}