-
-
Notifications
You must be signed in to change notification settings - Fork 727
/
LRUCachePolicy.java
62 lines (54 loc) · 1.86 KB
/
LRUCachePolicy.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
/*
* Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
*
* 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.
*/
import net.dv8tion.jda.api.entities.Member;
import net.dv8tion.jda.api.utils.MemberCachePolicy;
import java.util.LinkedList;
/**
* Implements a Least-Recently-Used (LRU) cache (independent of guilds).
* <br>The cache policy will keep track of how many members are currently cached and will removed the least recently
* cached member once the maximum is reached.
*/
public class LRUCachePolicy implements MemberCachePolicy
{
private final int max;
private final LinkedList<Long> cached = new LinkedList<>();
public LRUCachePolicy(int max)
{
this.max = max;
}
@Override
public synchronized boolean cacheMember(Member member)
{
long id = member.getIdLong();
int index = cached.indexOf(id);
// Special case, the member is the most recently used already
if (index == 0)
return true;
if (index > 0)
{
// Promote member to most recently used
cached.remove(index);
}
else if (cached.size() >= max)
{
// Unload LRU user
long remove = cached.removeLast();
member.getJDA().unloadUser(remove);
}
cached.addFirst(id);
return true;
}
}