/*
    * ====================================================================
    * 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
   * <http://www.apache.org/>.
   *
   */
  
  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<String, Object> 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<String, Object>();
         }
         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;
     }
 
 }