code: /*
   * 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.skywalking.oap.server.analyzer.provider.trace;
  
  import com.google.common.base.Splitter;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.concurrent.atomic.AtomicReference;
  import org.apache.skywalking.oap.server.analyzer.module.AnalyzerModule;
  import org.apache.skywalking.oap.server.configuration.api.ConfigChangeWatcher;
  import org.apache.skywalking.oap.server.library.module.ModuleProvider;
  
  public class CacheWriteLatencyThresholdsAndWatcher extends ConfigChangeWatcher {
      private AtomicReference<Map<String, Integer>> thresholds;
      private final String initialSettingsString;
      private volatile String dynamicSettingsString;
  
      public CacheWriteLatencyThresholdsAndWatcher(String config, ModuleProvider provider) {
          super(AnalyzerModule.NAME, provider, "slowCacheWriteThreshold");
          thresholds = new AtomicReference<>(new HashMap<>());
          initialSettingsString = config;
  
          activeSetting(config);
      }
  
      private void activeSetting(String config) {
          Map<String, Integer> newThresholds = new HashMap<>();
          List<String> settings = Splitter.on(',').splitToList(config);
          for (String setting : settings) {
              List<String> typeValue = Splitter.on(":").splitToList(setting);
              if (typeValue.size() == 2) {
                  newThresholds.put(typeValue.get(0).trim().toLowerCase(), Integer.parseInt(typeValue.get(1).trim()));
              }
          }
          thresholds.set(newThresholds);
      }
  
      public int getThreshold(String type) {
          type = type.toLowerCase();
          if (thresholds.get().containsKey(type)) {
              return thresholds.get().get(type);
          } else {
              return Optional.ofNullable(thresholds.get().get("default")).orElse(Integer.MAX_VALUE);
          }
      }
  
      @Override
      public void notify(ConfigChangeEvent value) {
          if (EventType.DELETE.equals(value.getEventType())) {
              dynamicSettingsString = null;
              activeSetting(initialSettingsString);
          } else {
              dynamicSettingsString = value.getNewValue();
              activeSetting(value.getNewValue());
          }
      }
  
      @Override
      public String value() {
          return dynamicSettingsString;
      }
  }
  