com.itextpdf.kernel.counter.data.EventDataHandlerUtil Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2019 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, et al.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation with the addition of the
following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
OF THIRD PARTY RIGHTS
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, see http://www.gnu.org/licenses or write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA, 02110-1301 USA, or download the license from the following URL:
http://itextpdf.com/terms-of-use/
The interactive user interfaces in modified source and object code versions
of this program must display Appropriate Legal Notices, as required under
Section 5 of the GNU Affero General Public License.
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a covered work must retain the producer line in every PDF that is created
or manipulated using iText.
You can be released from the requirements of the license by purchasing
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develop commercial activities involving the iText software without
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*/
package com.itextpdf.kernel.counter.data;
import com.itextpdf.io.LogMessageConstant;
import org.slf4j.LoggerFactory;
import java.util.Comparator;
/**
* The util class with service methods for {@link EventDataHandler} and comparator class,
* that can be used in {@link EventDataCacheComparatorBased}.
*/
public final class EventDataHandlerUtil {
private EventDataHandlerUtil() {
}
/**
* Registers shutdown hook for {@link EventDataHandler} that will try to process all the events that are left.
* It isn't guarantied that all events would be processed.
*
* @param dataHandler the {@link EventDataHandler} for which the hook will be registered
* @param the data signature type
* @param the data type
*/
public static > void registerProcessAllShutdownHook(final EventDataHandler dataHandler) {
try {
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
dataHandler.tryProcessRest();
}
});
} catch (SecurityException security) {
LoggerFactory.getLogger(EventDataHandlerUtil.class).error(LogMessageConstant.UNABLE_TO_REGISTER_EVENT_DATA_HANDLER_SHUTDOWN_HOOK);
} catch (Exception ignored) {
//The other exceptions are indicating that ether hook is already registered or hooks are running,
//so there is nothing to do here
}
}
/**
* Creates thread that will try to trigger event processing with time interval from specified {@link EventDataHandler}
*
* @param dataHandler the {@link EventDataHandler} for which the thread will be registered
* @param the data signature type
* @param the data type
*/
public static > void registerTimedProcessing(final EventDataHandler dataHandler) {
Thread thread = new Thread() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(dataHandler.getWaitTime().getTime());
dataHandler.tryProcessNextAsync(false);
} catch (InterruptedException e) {
break;
} catch (Exception any) {
LoggerFactory.getLogger(EventDataHandlerUtil.class).error(LogMessageConstant.UNEXPECTED_EVENT_HANDLER_SERVICE_THREAD_EXCEPTION, any);
break;
}
}
}
};
thread.setDaemon(true);
thread.start();
}
/**
* Comparator class that can be used in {@link EventDataCacheComparatorBased}.
* If so, the cache will return {@link EventData} with bigger count first.
*
* @param the data signature type
* @param the data type
*/
public static class BiggerCountComparator> implements Comparator {
@Override
public int compare(V o1, V o2) {
return Long.compare(o2.getCount(), o1.getCount());
}
}
}