/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v1.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  package ch.qos.logback.classic.turbo;
  
  import org.slf4j.Marker;
  
  import ch.qos.logback.classic.Level;
  import ch.qos.logback.classic.Logger;
  import ch.qos.logback.core.spi.FilterReply;
  
  /**
   * 
   * See {@link http://logback.qos.ch/manual/filters.html#DuplicateMessageFilter}
   * for details.
   * 
   * @author Ceki Gulcu
   * 
   */
  public class DuplicateMessageFilter extends TurboFilter {
  
      /**
       * The default cache size.
       */
      public static final int DEFAULT_CACHE_SIZE = 100;
      /**
       * The default number of allows repetitions.
       */
      public static final int DEFAULT_ALLOWED_REPETITIONS = 5;
  
      public int allowedRepetitions = DEFAULT_ALLOWED_REPETITIONS;
      public int cacheSize = DEFAULT_CACHE_SIZE;
  
      private LRUMessageCache msgCache;
  
      @Override
      public void start() {
          msgCache = new LRUMessageCache(cacheSize);
          super.start();
      }
  
      @Override
      public void stop() {
          msgCache.clear();
          msgCache = null;
          super.stop();
      }
  
      @Override
      public FilterReply decide(Marker marker, Logger logger, Level level, String format, Object[] params, Throwable t) {
          int count = msgCache.getMessageCountAndThenIncrement(format);
          if (count <= allowedRepetitions) {
              return FilterReply.NEUTRAL;
          } else {
              return FilterReply.DENY;
          }
      }
  
      public int getAllowedRepetitions() {
          return allowedRepetitions;
      }
  
      /**
       * The allowed number of repetitions before
       * 
       * @param allowedRepetitions
       */
      public void setAllowedRepetitions(int allowedRepetitions) {
          this.allowedRepetitions = allowedRepetitions;
      }
  
      public int getCacheSize() {
          return cacheSize;
      }
  
      public void setCacheSize(int cacheSize) {
          this.cacheSize = cacheSize;
      }
  
  }