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EventCache.java
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/
EventCache.java
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/*
* Copyright 2015-2016 Austin Keener & Michael Ritter
*
* 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 net.dv8tion.jda.core.handle;
import net.dv8tion.jda.core.JDA;
import net.dv8tion.jda.core.utils.SimpleLog;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
public class EventCache
{
public static final SimpleLog LOG = SimpleLog.getLog("EventCache");
private static HashMap<JDA, EventCache> caches = new HashMap<>();
private HashMap<Type, HashMap<String, List<Runnable>>> eventCache = new HashMap<>();
public static EventCache get(JDA jda)
{
EventCache cache = caches.get(jda);
if (cache == null)
{
cache = new EventCache();
caches.put(jda, cache);
}
return cache;
}
public void cache(Type type, String triggerId, Runnable handler)
{
HashMap<String, List<Runnable>> triggerCache = eventCache.get(type);
if (triggerCache == null)
{
triggerCache = new HashMap<>();
eventCache.put(type, triggerCache);
}
List<Runnable> items = triggerCache.get(triggerId);
if (items == null)
{
items = new LinkedList<>();
triggerCache.put(triggerId, items);
}
items.add(handler);
}
public void playbackCache(Type type, String triggerId)
{
List<Runnable> items;
try
{
items = eventCache.get(type).get(triggerId);
}
catch (NullPointerException e)
{
//If we encounter an NPE that means something didn't exist.
return;
}
if (items != null && !items.isEmpty())
{
EventCache.LOG.debug("Replaying " + items.size() + " events from the EventCache for a " + type + " with id: " + triggerId);
List<Runnable> itemsCopy = new LinkedList<>(items);
items.clear();
for (Runnable item : itemsCopy)
{
item.run();
}
}
}
public int size()
{
int count = 0;
for (HashMap<String, List<Runnable>> typeMap : eventCache.values())
{
for (List<Runnable> eventList : typeMap.values())
{
count += eventList.size();
}
}
return count;
}
public void clear()
{
eventCache.clear();
}
public enum Type
{
USER, GUILD, CHANNEL, ROLE, RELATIONSHIP, CALL
}
}