如题,因为要实现同一任务不能并发。
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/*
* Copyright 2001-2009 Terracotta, Inc.
*
* 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.quartz;
/**
* A marker interface for <code>{@link org.quartz.JobDetail}</code> s that
* wish to have their state maintained between executions.
*
* <p>
* <code>StatefulJob</code> instances follow slightly different rules from
* regular <code>Job</code> instances. The key difference is that their
* associated <code>{@link JobDataMap}</code> is re-persisted after every
* execution of the job, thus preserving state for the next execution. The
* other difference is that stateful jobs are not allowed to execute
* concurrently, which means new triggers that occur before the completion of
* the <code>execute(xx)</code> method will be delayed.
* </p>
*
* @see DisallowConcurrentExecution
* @see PersistJobDataAfterExecution
*
* @see Job
* @see JobDetail
* @see JobDataMap
* @see Scheduler
*
*
* @deprecated use DisallowConcurrentExecution and/or PersistJobDataAfterExecution annotations instead.
*
* @author James House
*/
@PersistJobDataAfterExecution
@DisallowConcurrentExecution
public interface StatefulJob extends Job {
/*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* Interface.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
}
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