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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;
import static com.google.common.base.Preconditions.checkArgument;
import static java.text.MessageFormat.format;

This utility class has several methods and constants for working with quartz-style cron expressions.

Author(s):
Dominik Obermaier
public class ScheduleExpressions {

    
Returns the a Schedule Expression which schedules to the beginning of every minute
    public static final String ONCE_A_MINUTE = "0 0/1 * * * ?";

    
Returns a quartz-style cron expression which is used to schedule something every X minutes.

This is useful if you want to run a scheduled callback e.g. every 10 minutes.

Parameters:
minutes the minutes
Returns:
the quartz-style cron expression for the number of minutes passed
Throws:
java.lang.IllegalArgumentException if the number of minutes is < 1
    public static String everyMinutes(final int minutes) {
        final String minutePattern = "0 0/{0,number,#} * * * ?";
        checkArgument(minutes > 0, "Only a number of minutes > 0 can be used for scheduling. %s was provided."minutes);
        return format(minutePatternminutes);
    }
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