org.apache.flink.runtime.checkpoint.LastStateConnectionStateListener Maven / Gradle / Ivy
/*
* 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.flink.runtime.checkpoint;
import org.apache.flink.shaded.curator5.org.apache.curator.framework.state.ConnectionState;
import org.apache.flink.shaded.curator5.org.apache.curator.framework.state.ConnectionStateListener;
import java.util.Optional;
/** {@link ConnectionStateListener} which records the last state it was notified about. */
public interface LastStateConnectionStateListener extends ConnectionStateListener {
/**
* Return the last state the listener was notified about.
*
* @return the last state or none if the listener has not received an update
*/
Optional getLastState();
}