FrontendPrivileges.java

/*
 * Copyright 1999-2012 Alibaba Group.
 * 
 * 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 fm.liu.timo.net.handler;

import java.util.Set;

/**
 * 权限提供者
 * 
 * @author xianmao.hexm
 */
public interface FrontendPrivileges {

    /**
     * 检查schema是否存在
     */
    boolean schemaExists(String schema);

    /**
     * 检查用户是否存在，并且可以使用host实行隔离策略。
     */
    boolean userExists(String user, String host);

    /**
     * 提供用户的服务器端密码
     */
    String getPassword(String user);

    /**
     * 提供有效的用户schema集合
     */
    Set<String> getUserSchemas(String user);

}