content: /*
   * Copyright 1999-2019 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;
  
  /**
   * @author jialiang.linjl
   * @author Carpenter Lee
   * @since 1.5.0
   */
  public class OccupyTimeoutProperty {
  
      /**
       * <p>
       * Max occupy timeout in milliseconds. Requests with priority can occupy tokens of the future statistic
       * window, and {@code occupyTimeout} limit the max time length that can be occupied.
       * </p>
       * <p>
       * Note that the timeout value should never be greeter than {@link IntervalProperty#INTERVAL}.
       * </p>
       * DO NOT MODIFY this value directly, use {@link #updateTimeout(int)},
       * otherwise the modification will not take effect.
       */
      private static volatile int occupyTimeout = 500;
  
      public static void register2Property(SentinelProperty<Integer> property) {
          property.addListener(new SimplePropertyListener<Integer>() {
              @Override
              public void configUpdate(Integer value) {
                  if (value != null) {
                      updateTimeout(value);
                  }
              }
          });
      }
  
      public static int getOccupyTimeout() {
          return occupyTimeout;
      }
  
      /**
       * Update the timeout value.</br>
       * Note that the time out should never greeter than {@link IntervalProperty#INTERVAL},
       * or it will be ignored.
       *
       * @param newInterval new value.
       */
      public static void updateTimeout(int newInterval) {
          if (newInterval < 0) {
              RecordLog.warn("[OccupyTimeoutProperty] Illegal timeout value will be ignored: " + occupyTimeout);
              return;
          }
          if (newInterval > IntervalProperty.INTERVAL) {
              RecordLog.warn("[OccupyTimeoutProperty] Illegal timeout value will be ignored: {}, should <= {}",
                  occupyTimeout, IntervalProperty.INTERVAL);
              return;
          }
          if (newInterval != occupyTimeout) {
              occupyTimeout = newInterval;
          }
          RecordLog.info("[OccupyTimeoutProperty] occupyTimeout updated to: {}", occupyTimeout);
      }
  }
  