/*
* Copyright 2002-2009 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
*
* 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.springframework.scheduling;
import org.springframework.core.task.AsyncTaskExecutor;
/**
* A {@link org.springframework.core.task.TaskExecutor} extension exposing
* scheduling characteristics that are relevant to potential task submitters.
*
* <p>Scheduling clients are encouraged to submit
* {@link Runnable Runnables} that match the exposed preferences
* of the <code>TaskExecutor</code> implementation in use.
*
* @author Juergen Hoeller
* @since 2.0
* @see SchedulingAwareRunnable
* @see org.springframework.core.task.TaskExecutor
* @see org.springframework.scheduling.commonj.WorkManagerTaskExecutor
*/
public interface SchedulingTaskExecutor extends AsyncTaskExecutor {
/**
* Does this <code>TaskExecutor</code> prefer short-lived tasks over
* long-lived tasks?
* <p>A <code>SchedulingTaskExecutor</code> implementation can indicate
* whether it prefers submitted tasks to perform as little work as they
* can within a single task execution. For example, submitted tasks
* might break a repeated loop into individual subtasks which submit a
* follow-up task afterwards (if feasible).
* <p>This should be considered a hint. Of course <code>TaskExecutor</code>
* clients are free to ignore this flag and hence the
* <code>SchedulingTaskExecutor</code> interface overall. However, thread
* pools will usually indicated a preference for short-lived tasks, to be
* able to perform more fine-grained scheduling.
* @return <code>true</code> if this <code>TaskExecutor</code> prefers
* short-lived tasks
*/
boolean prefersShortLivedTasks();
}
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