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1 | /* |
2 | * Copyright (C) 2014 - Christian Babeux <christian.babeux@efficios.com> | |
3 | * | |
4 | * | |
5 | * This library is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public License | |
15 | * along with this library; if not, write to the Free Software Foundation, | |
16 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
19 | package org.lttng.ust.agent; | |
20 | ||
21 | import java.util.Map; | |
22 | import java.util.HashMap; | |
23 | import java.util.Iterator; | |
24 | ||
25 | public abstract class LogFrameworkSkeleton implements LogFramework { | |
26 | ||
27 | /* A map of event name and reference count */ | |
08284556 | 28 | private final Map<String, Integer> enabledLoggers; |
501f6777 CB |
29 | |
30 | public LogFrameworkSkeleton() { | |
31 | this.enabledLoggers = new HashMap<String, Integer>(); | |
32 | } | |
33 | ||
34 | @Override | |
35 | public Boolean enableLogger(String name) { | |
36 | if (name == null) { | |
37 | return false; | |
38 | } | |
39 | ||
40 | if (enabledLoggers.containsKey(name)) { | |
41 | /* Event is already enabled, simply increment its refcount */ | |
42 | Integer refcount = enabledLoggers.get(name); | |
43 | refcount++; | |
44 | Integer oldval = enabledLoggers.put(name, refcount); | |
45 | assert (oldval != null); | |
46 | } else { | |
47 | /* Event was not enabled, init refcount to 1 */ | |
48 | Integer oldval = enabledLoggers.put(name, 1); | |
49 | assert (oldval == null); | |
50 | } | |
51 | ||
52 | return true; | |
53 | } | |
54 | ||
55 | @Override | |
56 | public Boolean disableLogger(String name) { | |
57 | if (name == null) { | |
58 | return false; | |
59 | } | |
60 | ||
61 | if (!enabledLoggers.containsKey(name)) { | |
62 | /* Event was never enabled, abort */ | |
63 | return false; | |
64 | } | |
65 | ||
66 | /* Event was previously enabled, simply decrement its refcount */ | |
67 | Integer refcount = enabledLoggers.get(name); | |
68 | refcount--; | |
69 | assert (refcount >= 0); | |
70 | ||
71 | if (refcount == 0) { | |
72 | /* Event is not used anymore, remove it from the map */ | |
73 | Integer oldval = enabledLoggers.remove(name); | |
74 | assert (oldval != null); | |
75 | } | |
76 | ||
77 | return true; | |
78 | } | |
79 | ||
80 | @Override | |
81 | public abstract Iterator<String> listLoggers(); | |
82 | ||
83 | @Override | |
84 | public abstract Boolean isRoot(); | |
85 | ||
86 | @Override | |
87 | public void reset() { | |
88 | enabledLoggers.clear(); | |
89 | } | |
90 | ||
91 | protected Integer getEventCount() { | |
92 | return enabledLoggers.size(); | |
93 | } | |
94 | } |