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.compileflow.engine.config;
  
  /**
   * Pluggable configuration property resolver used by {@link ProcessPropertyProvider}.
   * Implementations may resolve from various sources such as Spring Environment,
   * system properties, environment variables, or external config centers.
   *
   * @author yusu
   */
  public interface PropertyResolver {
  
      String getString(String key, String defaultValue);
  
      int getInt(String key, int defaultValue);
  
      long getLong(String key, long defaultValue);
  
      boolean getBoolean(String key, boolean defaultValue);
  
  }
  
  
  