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/*
* 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.hadoop.ozone.container.common.states;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* State Interface that allows tasks to maintain states.
*/
public interface DatanodeState<T> {
/**
* Called before entering this state.
*/
void onEnter();
/**
* Called After exiting this state.
*/
void onExit();
/**
* Executes one or more tasks that is needed by this state.
*
* @param executor - ExecutorService
*/
void execute(ExecutorService executor);
/**
* Wait for execute to finish.
*
* @param time - Time
* @param timeUnit - Unit of time.
*/
T await(long time, TimeUnit timeUnit)
throws InterruptedException, ExecutionException, TimeoutException;
}
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