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/*
 * 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.gemstone.gemfire.cache;

import java.util.Properties;

/** 
 * An object that can be described in a declarative caching XML file.
 *
 * 
 *
 * Any user-defined object in the declarative caching xml file
 * should implement this interface in order to be constructed.
 *
 * 

 *
 * For example, the user can declare a CacheLoader in a declarative
 * XML file as follows:
 *
 * 
 *        <cache-loader>
 *          <class-name>com.company.app.DBLoader</class-name>
 *          <parameter name="URL">
 *            <string>jdbc://12.34.56.78/mydb</string>
 *          </parameter>
 *        </cache-loader>
 * 
 *
 * 
 *
 * In this case, com.company.app.DBLoader must 
 * implement both the {@link CacheLoader} and Declarable
 * interfaces. The cache service will construct a
 * com.company.app.DBLoader object by invoking the loader's
 * zero-argument constructor and then calling the {@link #init} method
 * to pass in the parameters.
 *
 * 
 *
 * See package introduction.
 *
 * @author Darrel Schneider
 *
 * 
 * @since 2.0
 */
public interface Declarable {

  /**
   * Initializes a user-defined object using the given properties.
   * Note that any uncaught exception thrown by this method will cause
   * the Cache initialization to fail.
   *
   * @param props 
   *        Contains the parameters declared in the declarative xml
   *        file.
   *
   * @throws IllegalArgumentException
   *         If one of the configuration options in props
   *         is illegal or malformed.
   */
  public void init(Properties props);
}