/*
* 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.ignite.compute;
import org.apache.ignite.IgniteException;
/**
* Annotation for handling master node leave during job execution.
* <p>
* If {@link ComputeJob} concrete class implements this interface then in case when master node leaves topology
* during job execution the callback method {@link #onMasterNodeLeft(ComputeTaskSession)} will be executed.
* <p>
* Implementing this interface gives you ability to preserve job execution result or its intermediate state
* which could be reused later. E.g. you can save job execution result to the database or as a checkpoint
* and reuse it when failed task is being executed again thus avoiding job execution from scratch.
*/
public interface ComputeJobMasterLeaveAware {
/**
* A method which is executed in case master node has left topology during job execution.
*
* @param ses Task session, can be used for checkpoint saving.
* @throws IgniteException In case of any exception.
*/
public void onMasterNodeLeft(ComputeTaskSession ses) throws IgniteException;
}