content: /*
   *
   * 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 com.alibaba.cloudapp.starter.base.properties;
  
  import com.alibaba.cloudapp.starter.refresh.PropKeyRefreshedEvent;
  import org.springframework.beans.BeansException;
  import org.springframework.boot.context.properties.ConfigurationProperties;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.ApplicationContextAware;
  import org.springframework.core.annotation.AnnotationUtils;
  
  import javax.annotation.PostConstruct;
  
  public abstract class RefreshableProperties implements ApplicationContextAware {
  
      private ApplicationContext applicationContext;
      
      /**
       * refreshable not set ===> refresh disabled.
       * refreshable = false ===> refresh disabled.
       * refreshable = true  ===> refresh enabled.
       */
      private Boolean refreshable;
  
      // default enabled.
      private boolean refreshEnabled = true;
  
      public void setRefreshable(String refreshable) {
          boolean ref = Boolean.parseBoolean(refreshable);
  
          Object old = this.refreshable;
          this.refreshable = ref;
  
          // first time set value.
          if (old == null) {
              refreshEnabled = ref;
          }
      }
      
      public Boolean getRefreshable() {
          return refreshable;
      }
      
      @PostConstruct
      public void afterConstruct()
      {
          if (! refreshEnabled) {
              // disabled.
              return;
          }
  
          ConfigurationProperties prop = AnnotationUtils.getAnnotation(
                  this.getClass(), ConfigurationProperties.class);
          
          assert prop != null;
          String prefix = prop.prefix();
          this.publishEvent(prefix, this);
      }
      
      @Override
      public void setApplicationContext(ApplicationContext applicationContext)
              throws BeansException {
          this.applicationContext = applicationContext;
      }
      
      public void publishEvent(String prefix, RefreshableProperties properties) {
          applicationContext.publishEvent(new PropKeyRefreshedEvent(prefix, properties));
      }
      
  }
  