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.property;
  
  /**
   * A {@link SentinelProperty} that will never inform the {@link PropertyListener} on it.
   *
   * @author leyou
   */
  public final class NoOpSentinelProperty implements SentinelProperty<Object> {
  
      @Override
      public void addListener(PropertyListener<Object> listener) { }
  
      @Override
      public void removeListener(PropertyListener<Object> listener) { }
  
      @Override
      public boolean updateValue(Object newValue) {
          return true;
      }
  }
  