content: /**
   * 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.
   */
  package org.apache.activemq.management;
  
  public class SizeStatisticImpl extends StatisticImpl {
  
      private long count;
      private volatile long maxSize;
      private volatile long minSize;
      private long totalSize;
      private SizeStatisticImpl parent;
  
      public SizeStatisticImpl(String name, String description) {
          this(name, "bytes", description);
      }
  
      public SizeStatisticImpl(SizeStatisticImpl parent, String name, String description) {
          this(name, description);
          this.parent = parent;
      }
  
      public SizeStatisticImpl(String name, String unit, String description) {
          super(name, unit, description);
      }
  
      @Override
      public synchronized void reset() {
          if (isDoReset()) {
              super.reset();
              count = 0;
              maxSize = 0;
              minSize = 0;
              totalSize = 0;
          }
      }
  
      public synchronized long getCount() {
          return count;
      }
  
      public synchronized void addSize(long size) {
          count++;
          totalSize += size;
          if (size > maxSize) {
              maxSize = size;
          }
          if (size < minSize || minSize == 0) {
              minSize = size;
          }
          updateSampleTime();
          if (parent != null) {
              parent.addSize(size);
          }
      }
  
      /**
       * Reset the total size to the new value
       *
       * @param size
       */
      public synchronized void setTotalSize(long size) {
          count++;
          totalSize = size;
          if (size > maxSize) {
              maxSize = size;
          }
          if (size < minSize || minSize == 0) {
              minSize = size;
          }
          updateSampleTime();
      }
  
      /**
       * @return the maximum size of any step
       */
      public long getMaxSize() {
          return maxSize;
      }
  
      /**
       * @return the maximum size of any step
       */
      public void setMaxSize(long size) {
          maxSize = size;
      }
  
      /**
       * @return the minimum size of any step
       */
      public long getMinSize() {
          return minSize;
      }
  
      /**
       * @return the maximum size of any step
       */
      public void setMinSize(long size) {
          minSize = size;
      }
  
      /**
       * @return the total size of all the steps added together
       */
      public synchronized long getTotalSize() {
          return totalSize;
      }
  
      public synchronized void setCount(long count) {
          this.count = count;
      }
  
      /**
       * @return the average size calculated by dividing the total size by the
       *         number of counts
       */
      public synchronized double getAverageSize() {
          if (count == 0) {
              return 0;
          }
          double d = totalSize;
          return d / count;
      }
  
      /**
       * @return the average size calculated by dividing the total size by the
       *         number of counts but excluding the minimum and maximum sizes.
       */
      public synchronized double getAverageSizeExcludingMinMax() {
          if (count <= 2) {
              return 0;
          }
          double d = totalSize - minSize - maxSize;
          return d / (count - 2);
      }
  
      /**
       * @return the average number of steps per second
       */
      public double getAveragePerSecond() {
          double d = 1000;
          double averageSize = getAverageSize();
          if (averageSize == 0) {
              return 0;
          }
          return d / averageSize;
      }
  
      /**
       * @return the average number of steps per second excluding the min & max
       *         values
       */
      public double getAveragePerSecondExcludingMinMax() {
          double d = 1000;
          double average = getAverageSizeExcludingMinMax();
          if (average == 0) {
              return 0;
          }
          return d / average;
      }
  
      public SizeStatisticImpl getParent() {
          return parent;
      }
  
      public void setParent(SizeStatisticImpl parent) {
          this.parent = parent;
      }
  
      @Override
      protected synchronized void appendFieldDescription(StringBuffer buffer) {
          buffer.append(" count: ");
          buffer.append(Long.toString(count));
          buffer.append(" maxSize: ");
          buffer.append(Long.toString(maxSize));
          buffer.append(" minSize: ");
          buffer.append(Long.toString(minSize));
          buffer.append(" totalSize: ");
          buffer.append(Long.toString(totalSize));
          buffer.append(" averageSize: ");
          buffer.append(Double.toString(getAverageSize()));
          buffer.append(" averageTimeExMinMax: ");
          buffer.append(Double.toString(getAveragePerSecondExcludingMinMax()));
          buffer.append(" averagePerSecond: ");
          buffer.append(Double.toString(getAveragePerSecond()));
          buffer.append(" averagePerSecondExMinMax: ");
          buffer.append(Double.toString(getAveragePerSecondExcludingMinMax()));
          super.appendFieldDescription(buffer);
      }
  }
  