/**
* 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 org.apache.hadoop.hive.metastore.hooks;
import org.apache.hadoop.conf.Configuration;
/**
* JDOConnectURLHook is used to get the URL that JDO uses to connect to the
* database that stores the metastore data. Classes implementing this must be
* thread-safe (for Thrift server).
*/
public interface JDOConnectionURLHook {
/**
* Gets the connection URL to supply to JDO. In addition to initialization,
* this method will be called after a connection failure for each reconnect
* attempt.
*
* @param conf The configuration used to initialize this instance of the HMS
* @return the connection URL
* @throws Exception
*/
public String getJdoConnectionUrl(Configuration conf)
throws Exception;
/**
* Alerts this that the connection URL was bad. Can be used to collect stats,
* etc.
*
* @param url
*/
public void notifyBadConnectionUrl(String url);
}