content: /*
   * Copyright 1999-2018 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.csp.sentinel.node;
  
  import com.alibaba.csp.sentinel.log.RecordLog;
  import com.alibaba.csp.sentinel.property.SentinelProperty;
  import com.alibaba.csp.sentinel.property.SimplePropertyListener;
  import com.alibaba.csp.sentinel.slots.block.RuleConstant;
  import com.alibaba.csp.sentinel.slots.clusterbuilder.ClusterBuilderSlot;
  
  /**
   * QPS statistics interval.
   *
   * @author youji.zj
   * @author jialiang.linjl
   * @author Carpenter Lee
   * @author Eric Zhao
   */
  public class IntervalProperty {
  
      /**
       * <p>Interval in milliseconds. This variable determines sensitivity of the QPS calculation.</p>
       * <p>
       * DO NOT MODIFY this value directly, use {@link #updateInterval(int)}, otherwise the modification will not
       * take effect.
       * </p>
       */
      public static volatile int INTERVAL = RuleConstant.DEFAULT_WINDOW_INTERVAL_MS;
  
      public static void register2Property(SentinelProperty<Integer> property) {
          property.addListener(new SimplePropertyListener<Integer>() {
              @Override
              public void configUpdate(Integer value) {
                  if (value != null) {
                      updateInterval(value);
                  }
              }
          });
      }
  
      /**
       * Update the {@link #INTERVAL}, All {@link ClusterNode}s will be reset if newInterval is
       * different from {@link #INTERVAL}
       *
       * @param newInterval New interval to set.
       */
      public static void updateInterval(int newInterval) {
          if (newInterval != INTERVAL) {
              INTERVAL = newInterval;
              ClusterBuilderSlot.resetClusterNodes();
          }
          RecordLog.info("[IntervalProperty] INTERVAL updated to: {}", INTERVAL);
      }
  
  }
  