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 /*
  * Copyright 2014 dc-square GmbH
  *
  * 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 com.dcsquare.hivemq.spi.callback.schedule;
This callback gets called periodically based on the value provided in the cronExpression() method.

This callback is especially useful for recurring tasks like maintenance tasks.

Author(s):
Dominik Obermaier
Since:
2.0
public interface ScheduledCallback extends AsynchronousCallback {


    
This method gets executed on the given schedules
    void execute();

    
This method returns the quartz-like cron expression for the callback.

Note that this method only gets called once when adding the callback to the com.dcsquare.hivemq.spi.callback.registry.CallbackRegistry. If you have dynamic cron expressions in this method, you must manually call the com.dcsquare.hivemq.spi.callback.registry.CallbackRegistry.reloadScheduledCallbackExpression(com.dcsquare.hivemq.spi.callback.schedule.ScheduledCallback) method in order to reload the expression

Returns:
a String which contains the quartz-like cron expressions.
See also:
Documentation for quartz cron expressions
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