content: /*
   * Copyright 1999-2023 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.nacos.core.monitor.topn;
  
  import com.alibaba.nacos.core.config.AbstractDynamicConfig;
  import com.alibaba.nacos.sys.env.EnvUtil;
  
  import java.util.concurrent.TimeUnit;
  
  /**
   * TopN configurations.
   *
   * @author xiweng.yy
   */
  @SuppressWarnings("PMD.ClassNamingShouldBeCamelRule")
  public class TopNConfig extends AbstractDynamicConfig {
      
      private static final String TOP_N = "topN";
      
      private static final TopNConfig INSTANCE = new TopNConfig();
      
      private static final String TOP_N_PREFIX = "nacos.core.monitor.topn.";
      
      private static final String ENABLED_KEY = TOP_N_PREFIX + "enabled";
      
      private static final String COUNT_KEY = TOP_N_PREFIX + "count";
      
      private static final String INTERNAL_MS_KEY = TOP_N_PREFIX + "internalMs";
      
      private static final boolean DEFAULT_ENABLED = true;
      
      private static final int DEFAULT_COUNT = 10;
      
      private static final long DEFAULT_INTERNAL_MS = TimeUnit.SECONDS.toMillis(30);
      
      private boolean enabled;
      
      private int countOfTopN;
      
      private long internalMs;
      
      private TopNConfig() {
          super(TOP_N);
          resetConfig();
      }
      
      @Override
      protected void getConfigFromEnv() {
          enabled = EnvUtil.getProperty(ENABLED_KEY, Boolean.class, DEFAULT_ENABLED);
          countOfTopN = EnvUtil.getProperty(COUNT_KEY, Integer.class, DEFAULT_COUNT);
          internalMs = EnvUtil.getProperty(INTERNAL_MS_KEY, Long.class, DEFAULT_INTERNAL_MS);
      }
      
      @Override
      protected String printConfig() {
          return toString();
      }
      
      @Override
      public String toString() {
          return "TopNConfig{" + "enabled=" + enabled + ", topNCount=" + countOfTopN + ", internalMs=" + internalMs + '}';
      }
      
      public static TopNConfig getInstance() {
          return INSTANCE;
      }
      
      public boolean isEnabled() {
          return enabled;
      }
      
      public int getCountOfTopN() {
          return countOfTopN;
      }
      
      public long getInternalMs() {
          return internalMs;
      }
  }
  