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/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */

package org.apache.http.impl;

import java.util.HashMap;
import java.util.Map;

import org.apache.http.HttpConnectionMetrics;
import org.apache.http.io.HttpTransportMetrics;

/**
 * Default implementation of the {@link HttpConnectionMetrics} interface.
 *
 * @since 4.0
 */
public class HttpConnectionMetricsImpl implements HttpConnectionMetrics {

    public static final String REQUEST_COUNT = "http.request-count";
    public static final String RESPONSE_COUNT = "http.response-count";
    public static final String SENT_BYTES_COUNT = "http.sent-bytes-count";
    public static final String RECEIVED_BYTES_COUNT = "http.received-bytes-count";

    private final HttpTransportMetrics inTransportMetric;
    private final HttpTransportMetrics outTransportMetric;
    private long requestCount = 0;
    private long responseCount = 0;

    /**
     * The cache map for all metrics values.
     */
    private Map metricsCache;

    public HttpConnectionMetricsImpl(
            final HttpTransportMetrics inTransportMetric,
            final HttpTransportMetrics outTransportMetric) {
        super();
        this.inTransportMetric = inTransportMetric;
        this.outTransportMetric = outTransportMetric;
    }

    /* ------------------  Public interface method -------------------------- */

    @Override
    public long getReceivedBytesCount() {
        return this.inTransportMetric != null ? this.inTransportMetric.getBytesTransferred() : -1;
    }

    @Override
    public long getSentBytesCount() {
        return this.outTransportMetric != null ? this.outTransportMetric.getBytesTransferred() : -1;
    }

    @Override
    public long getRequestCount() {
        return this.requestCount;
    }

    public void incrementRequestCount() {
        this.requestCount++;
    }

    @Override
    public long getResponseCount() {
        return this.responseCount;
    }

    public void incrementResponseCount() {
        this.responseCount++;
    }

    @Override
    public Object getMetric(final String metricName) {
        Object value = null;
        if (this.metricsCache != null) {
            value = this.metricsCache.get(metricName);
        }
        if (value == null) {
            if (REQUEST_COUNT.equals(metricName)) {
                value = Long.valueOf(requestCount);
            } else if (RESPONSE_COUNT.equals(metricName)) {
                value = Long.valueOf(responseCount);
            } else if (RECEIVED_BYTES_COUNT.equals(metricName)) {
                return this.inTransportMetric != null
                                ? Long.valueOf(this.inTransportMetric.getBytesTransferred())
                                : null;
            } else if (SENT_BYTES_COUNT.equals(metricName)) {
                return this.outTransportMetric != null
                                ? Long.valueOf(this.outTransportMetric.getBytesTransferred())
                                : null;
            }
        }
        return value;
    }

    public void setMetric(final String metricName, final Object obj) {
        if (this.metricsCache == null) {
            this.metricsCache = new HashMap();
        }
        this.metricsCache.put(metricName, obj);
    }

    @Override
    public void reset() {
        if (this.outTransportMetric != null) {
            this.outTransportMetric.reset();
        }
        if (this.inTransportMetric != null) {
            this.inTransportMetric.reset();
        }
        this.requestCount = 0;
        this.responseCount = 0;
        this.metricsCache = null;
    }

}