Commit | Line | Data |
---|---|---|
501f6777 CB |
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 | ||
501f6777 CB |
21 | import java.util.HashMap; |
22 | import java.util.Iterator; | |
5bfeaeca | 23 | import java.util.Map; |
501f6777 | 24 | |
5bfeaeca AM |
25 | /** |
26 | * Basic implementation of LogFramework. | |
27 | * | |
28 | * @author Christian Babeux | |
29 | */ | |
501f6777 CB |
30 | public abstract class LogFrameworkSkeleton implements LogFramework { |
31 | ||
32 | /* A map of event name and reference count */ | |
08284556 | 33 | private final Map<String, Integer> enabledLoggers; |
501f6777 | 34 | |
5bfeaeca AM |
35 | /** |
36 | * Constructor | |
37 | */ | |
501f6777 CB |
38 | public LogFrameworkSkeleton() { |
39 | this.enabledLoggers = new HashMap<String, Integer>(); | |
40 | } | |
41 | ||
42 | @Override | |
43 | public Boolean enableLogger(String name) { | |
44 | if (name == null) { | |
45 | return false; | |
46 | } | |
47 | ||
48 | if (enabledLoggers.containsKey(name)) { | |
49 | /* Event is already enabled, simply increment its refcount */ | |
50 | Integer refcount = enabledLoggers.get(name); | |
51 | refcount++; | |
52 | Integer oldval = enabledLoggers.put(name, refcount); | |
53 | assert (oldval != null); | |
54 | } else { | |
55 | /* Event was not enabled, init refcount to 1 */ | |
56 | Integer oldval = enabledLoggers.put(name, 1); | |
57 | assert (oldval == null); | |
58 | } | |
59 | ||
60 | return true; | |
61 | } | |
62 | ||
63 | @Override | |
64 | public Boolean disableLogger(String name) { | |
65 | if (name == null) { | |
66 | return false; | |
67 | } | |
68 | ||
69 | if (!enabledLoggers.containsKey(name)) { | |
70 | /* Event was never enabled, abort */ | |
71 | return false; | |
72 | } | |
73 | ||
74 | /* Event was previously enabled, simply decrement its refcount */ | |
75 | Integer refcount = enabledLoggers.get(name); | |
76 | refcount--; | |
77 | assert (refcount >= 0); | |
78 | ||
79 | if (refcount == 0) { | |
80 | /* Event is not used anymore, remove it from the map */ | |
81 | Integer oldval = enabledLoggers.remove(name); | |
82 | assert (oldval != null); | |
83 | } | |
84 | ||
85 | return true; | |
86 | } | |
87 | ||
88 | @Override | |
89 | public abstract Iterator<String> listLoggers(); | |
90 | ||
91 | @Override | |
92 | public abstract Boolean isRoot(); | |
93 | ||
94 | @Override | |
95 | public void reset() { | |
96 | enabledLoggers.clear(); | |
97 | } | |
98 | ||
5bfeaeca AM |
99 | /** |
100 | * Get the number of enabled events. | |
101 | * | |
102 | * @return The number of enabled events | |
103 | */ | |
501f6777 CB |
104 | protected Integer getEventCount() { |
105 | return enabledLoggers.size(); | |
106 | } | |
107 | } |