/*******************************************************************************
* Copyright 2011 Netflix
*
* 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.netflix.astyanax.connectionpool;
import org.joda.time.DateTime;
/**
* Interface for a module that periodically updates the nodes in a connection
* pool.
*
* @author elandau
*
*/
public interface NodeDiscovery {
/**
* Start the node discovery thread
*/
void start();
/**
* Stop the node discovery thread
*/
void shutdown();
/**
* Get the last refresh time in the discovery thread
*
* @return
*/
DateTime getLastRefreshTime();
/**
* Get the number of refreshes
*
* @return
*/
long getRefreshCount();
/**
* Get total number of errors encountered during a refresh
*
* @return
*/
long getErrorCount();
/**
* Get the last exception that was encountered
*
* @return
*/
Exception getLastException();
/**
* Get the raw list of nodes from the underlying refresh mechanism
*
* @return
*/
String getRawHostList();
}