/*
 * Copyright 2002-2020 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.scheduling;

import java.time.Clock;
import java.util.Date;

import org.springframework.lang.Nullable;

Context object encapsulating last execution times and last completion time
of a given task.
Author:
Juergen Hoeller
Since:
3.0/**
 * Context object encapsulating last execution times and last completion time
 * of a given task.
 *
 * @author Juergen Hoeller
 * @since 3.0
 */
public interface TriggerContext {

	
Return the clock to use for trigger calculation.
See Also:
TaskScheduler.getClock()
Clock.systemDefaultZone()
Since:
5.3/**
	 * Return the clock to use for trigger calculation.
	 * @since 5.3
	 * @see TaskScheduler#getClock()
	 * @see Clock#systemDefaultZone()
	 */
	default Clock getClock() {
		return Clock.systemDefaultZone();
	}

	
Return the last scheduled execution time of the task, or null if not scheduled before. /**
	 * Return the last <i>scheduled</i> execution time of the task,
	 * or {@code null} if not scheduled before.
	 */
	@Nullable
	Date lastScheduledExecutionTime();

	
Return the last actual execution time of the task, or null if not scheduled before. /**
	 * Return the last <i>actual</i> execution time of the task,
	 * or {@code null} if not scheduled before.
	 */
	@Nullable
	Date lastActualExecutionTime();

	
Return the last completion time of the task, or null if not scheduled before. /**
	 * Return the last completion time of the task,
	 * or {@code null} if not scheduled before.
	 */
	@Nullable
	Date lastCompletionTime();

}