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;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.OutputStream;
  import java.util.Properties;
  
  import com.alibaba.csp.sentinel.config.SentinelConfig;
  import com.alibaba.csp.sentinel.log.LogBase;
  import com.alibaba.csp.sentinel.util.AppNameUtil;
  
  /**
   * Helper class for executing a task within a config context via properties file.
   *
   * @author Eric Zhao
   */
  public final class ConfigPropertyHelper {
  
      public static void setAppNameProperty(String appName) {
          System.setProperty(SentinelConfig.APP_NAME_PROP_KEY, appName);
      }
  
      public static void clearAppNameProperty() {
          System.clearProperty(SentinelConfig.APP_NAME_PROP_KEY);
      }
  
      public static void runWithConfig(Properties prop, String appName, Task task) throws Exception {
          if (prop == null || appName == null || "".equals(appName)) {
              throw new IllegalArgumentException("Prop and appName cannot be empty");
          }
          // Set application name property.
          setAppNameProperty(appName);
          // Save the config.
          String path = LogBase.getLogBaseDir() + appName + ".properties";
          File file = new File(path);
          if (!file.exists()) {
              file.createNewFile();
          }
          OutputStream outputStream = new FileOutputStream(file);
          prop.store(outputStream,"");
          outputStream.close();
          // Run the procedure.
          task.run();
          // Clean-up.
          file.delete();
          // Clear application name property.
          clearAppNameProperty();
      }
  
      public interface Task {
          void run() throws Exception;
      }
  
      private ConfigPropertyHelper() {}
  }
  