package org.apache.helix.zookeeper.zkclient.deprecated;

/*
 * 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.
 */

import org.apache.zookeeper.Watcher.Event.KeeperState;

@Deprecated
public interface IZkStateListener {

    /**
     * Called when the zookeeper connection state has changed.
     *
     * @param state
     *            The new state.
     * @throws Exception
     *             On any error.
     */
    public void handleStateChanged(KeeperState state) throws Exception;

    /**
     * Called after the zookeeper session has expired and a new session has been created. You would have to re-create
     * any ephemeral nodes here.
     *
     * @throws Exception
     *             On any error.
     */
    public void handleNewSession() throws Exception;

    /**
     * Called when a session cannot be re-established. This should be used to implement connection
     * failure handling e.g. retry to connect or pass the error up
     *
     * @param error
     *            The error that prevents a session from being established
     * @throws Exception
     *             On any error.
     */
    public void handleSessionEstablishmentError(final Throwable error) throws Exception;

}
