rapture.kernel.schedule.MultiCronParser Maven / Gradle / Ivy
/**
* The MIT License (MIT)
*
* Copyright (c) 2011-2016 Incapture Technologies LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package rapture.kernel.schedule;
import org.joda.time.DateTime;
import java.util.ArrayList;
import java.util.List;
import rapture.common.exception.RaptureExceptionFactory;
/**
* Parses a multiple cron tab spec, yielding an internal structure that you can ask questions of. Specifically, when is the next date from "date" (which could be now)
* that we can run based on this cron spec. We use this date in the RaptureJobExec.
*
* multiple cron tab spec is cron tabs, separated by ;
* empty specs are ignored
*
* @author amkimian
*
*/
public class MultiCronParser extends CronParser {
List cronList = new ArrayList<>();
public MultiCronParser(String input) {
String[] cronLines = input.split(";");
for (String cronLine : cronLines) {
cronLine = cronLine.trim();
if (!"".equals(cronLine)) {
cronList.add(new CronParser(cronLine));
}
}
}
public static CronParser create(String cronSpec) {
try {
MultiCronParser result = new MultiCronParser(cronSpec);
if (result.cronList.isEmpty()) {
throw new Exception("all empty");
}
return result;
} catch (Exception ex) {
throw RaptureExceptionFactory.create("Unsupported cron specification: " + cronSpec);
}
}
/**
* Returns the next run date based on a fromPoint (starting date). Returns null if there is no more future runs.
*
* @param fromPoint
* @return
*/
public DateTime nextRunDate(DateTime fromPoint) {
DateTime result = null;
// Take the earliest non-null nextRunDate for each CronParser, and return it.
for (CronParser cp : cronList) {
DateTime nextRun = cp.nextRunDate(fromPoint);
if (result == null || nextRun.isBefore(result)) {
result = nextRun;
}
}
return result;
}
}