spring Trigger 源码
spring Trigger 代码
文件路径：/spring-context/src/main/java/org/springframework/scheduling/Trigger.java
/*
* Copyright 2002-2022 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.Instant;
import java.util.Date;
import org.springframework.lang.Nullable;
/**
* Common interface for trigger objects that determine the next execution time
* of a task that they get associated with.
*
* @author Juergen Hoeller
* @since 3.0
* @see TaskScheduler#schedule(Runnable, Trigger)
* @see org.springframework.scheduling.support.CronTrigger
*/
public interface Trigger {
/**
* Determine the next execution time according to the given trigger context.
* @param triggerContext context object encapsulating last execution times
* and last completion time
* @return the next execution time as defined by the trigger,
* or {@code null} if the trigger won't fire anymore
* @deprecated as of 6.0, in favor of {@link #nextExecution(TriggerContext)}
*/
@Deprecated
@Nullable
default Date nextExecutionTime(TriggerContext triggerContext) {
Instant instant = nextExecution(triggerContext);
return instant != null ? Date.from(instant) : null;
}
/**
* Determine the next execution time according to the given trigger context.
* @param triggerContext context object encapsulating last execution times
* and last completion time
* @return the next execution time as defined by the trigger,
* or {@code null} if the trigger won't fire anymore
* @since 6.0
*/
@Nullable
Instant nextExecution(TriggerContext triggerContext);
}
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