com.itextpdf.kernel.log.CounterManager Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2022 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
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or FITNESS FOR A PARTICULAR PURPOSE.
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*/
package com.itextpdf.kernel.log;
import com.itextpdf.kernel.counter.EventCounterHandler;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Manager that works with {@link ICounterFactory}. Create {@link ICounter} for each registered {@link ICounterFactory}
* and send corresponding events on document read and write.
*
* You can implement your own {@link ICounterFactory} and register them with {@link CounterManager#register(ICounterFactory)}
* Or implement {@link ICounter} and register it with {@link SimpleCounterFactory} like this:
* CounterManager.getInstance().register(new SimpleCounterFactory(new SystemOutCounter());
* {@link SystemOutCounter} is just an example of a {@link ICounter} implementation.
*
* This functionality can be used to create metrics in a SaaS context.
* @deprecated will be removed in next major release, please use {@link EventCounterHandler} instead.
*/
@Deprecated
public class CounterManager {
/**
* The singleton instance.
*/
private static CounterManager instance = new CounterManager();
/**
* All registered factories.
*/
private Set factories = new HashSet<>();
private CounterManager() {
}
/**
* Returns the singleton instance of the factory.
* @return the {@link CounterManager} instance.
*/
public static CounterManager getInstance() {
return instance;
}
/**
* Returns a list of registered counters for specific class.
* @param cls the class for which registered counters are fetched.
* @return list of registered {@link ICounter}.
*/
public List getCounters(Class cls) {
ArrayList result = new ArrayList<>();
for (ICounterFactory factory : factories) {
ICounter counter = factory.getCounter(cls);
if (counter != null) {
result.add(counter);
}
}
return result;
}
/**
* Register new {@link ICounterFactory}. Does nothing if same factory was already registered.
*
* @param factory {@link ICounterFactory} to be registered
*/
public void register(ICounterFactory factory) {
if (factory != null) {
factories.add(factory);
}
}
/**
* Unregister specified {@link ICounterFactory}. Does nothing if this factory wasn't registered first.
*
* @param factory {@link ICounterFactory} to be unregistered
* @return {@code true} if specified factory was registered first
*/
public boolean unregister(ICounterFactory factory) {
if (factory != null) {
return factories.remove(factory);
}
return false;
}
}