/*-
* -\-\-
* Helios Services
* --
* Copyright (C) 2016 Spotify AB
* --
* 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.spotify.helios.servicescommon;
import com.spotify.helios.master.HostNotFoundException;
import com.spotify.helios.servicescommon.coordination.ZooKeeperClient;
import org.apache.zookeeper.KeeperException;
public interface ZooKeeperRegistrar {
/**
* Called upon startup
*
* @throws Exception If an unexpected error occurs.
*/
void startUp() throws Exception;
/**
* Called upon shutdown
*
* @throws Exception If an unexpected error occurs.
*/
void shutDown() throws Exception;
/**
* Called when ZK client connects. Handler should attempt to do on connection initialization here.
*
* @param client The zookeeper client.
* @return if registration was successful
* @throws KeeperException If an unexpected zookeeper error occurs.
* @throws HostNotFoundException If the hostname we are trying to re-register as doesn't exist.
*/
boolean tryToRegister(final ZooKeeperClient client)
throws KeeperException, HostNotFoundException;
}