blob: 5c1d77b167e14a6d576b6b664be91a147024a237 (
plain) (
blame)
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
|
/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.util.cache;
import org.eclipse.net4j.util.event.INotifier;
/**
* @author Eike Stepper
*/
public interface ICacheMonitor extends INotifier
{
public ConditionPolicy getConditionPolicy();
public Condition getCondition();
public ICacheProbe registerCache(ICache cache);
public void deregisterCache(ICache cache);
/**
* @author Eike Stepper
*/
public enum Condition
{
/**
* Condition <b>GREEN</b> indicates that the system is operating normally and enough free memory is available so
* that caches are free to cache additional elements.
*/
GREEN,
/**
* Condition <b>YELLOW</b> indicates that the system is operating normally but free memory is about to go low so
* that caches should stop to cache additional elements.
*/
YELLOW,
/**
* Condition <b>RED</b> indicates that the system state is critical and free memory is almost exhausted so that
* caches must immediately stop to cache additional elements. Depending of the eviction strategy element eviction is
* ordered.
*/
RED;
}
/**
* @author Eike Stepper
*/
public interface ConditionPolicy
{
public Condition getNewCondition(Condition oldCondition);
}
}
|
