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1 | /* |
2 | * Copyright (C) 2015, EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | package org.lttng.ust.agent.utils; | |
20 | ||
21 | import java.util.StringJoiner; | |
22 | ||
23 | import org.lttng.ust.agent.session.EventRule; | |
24 | import org.lttng.ust.agent.session.LogLevelSelector; | |
25 | ||
26 | /** | |
27 | * Factory class for {@link EventRule} objects, offering convenience methods | |
28 | * that mimic the results of passing the given arguments on the command-line. | |
29 | * | |
30 | * @author Alexandre Montplaisir | |
31 | */ | |
32 | public final class EventRuleFactory { | |
33 | ||
34 | /** Name of the "all" (-a) event */ | |
35 | public static final String EVENT_NAME_ALL = "*"; | |
36 | ||
37 | /** Log level set by default when it is not specified */ | |
38 | public static final LogLevelSelector LOG_LEVEL_UNSPECIFIED = new LogLevelSelector(Integer.MIN_VALUE, 0); | |
39 | ||
40 | private EventRuleFactory() {} | |
41 | ||
42 | /** | |
43 | * Construct an event by only passing the event name on the command-line. | |
44 | * | |
45 | * @param eventName | |
46 | * The event name | |
47 | * @return The corresponding event rule | |
48 | */ | |
49 | public static EventRule createRule(String eventName) { | |
50 | return new EventRule(eventName, LOG_LEVEL_UNSPECIFIED, filterStringFromEventName(eventName)); | |
51 | } | |
52 | ||
53 | /** | |
54 | * Construct and event rule by specifying the event name and log level. | |
55 | * | |
56 | * @param eventName | |
57 | * The event name | |
58 | * @param logLevelSelector | |
59 | * The log level | |
60 | * @return The corresponding event rule | |
61 | */ | |
62 | public static EventRule createRule(String eventName, LogLevelSelector logLevelSelector) { | |
63 | StringJoiner sj = new StringJoiner(") && (", "(", ")"); | |
64 | String filterStr = sj.add(filterStringFromEventName(eventName)) | |
65 | .add(filterStringFromLogLevel(logLevelSelector)) | |
66 | .toString(); | |
67 | return new EventRule(eventName, logLevelSelector, filterStr); | |
68 | } | |
69 | ||
70 | /** | |
71 | * Construct and event rule by specifying the event name, log level, and a | |
72 | * filter string. | |
73 | * | |
74 | * @param eventName | |
75 | * The event name | |
76 | * @param logLevelSelector | |
77 | * The log level | |
78 | * @param extraFilter | |
79 | * The filter string passed on the command-line | |
80 | * @return The corresponding event rule | |
81 | */ | |
82 | public static EventRule createRule(String eventName, LogLevelSelector logLevelSelector, String extraFilter) { | |
83 | StringJoiner sj1 = new StringJoiner(") && (", "(", ")"); | |
84 | sj1.add(extraFilter); | |
85 | sj1.add(filterStringFromEventName(eventName)); | |
86 | String firstPart = sj1.toString(); | |
87 | ||
88 | if (logLevelSelector.equals(LOG_LEVEL_UNSPECIFIED)) { | |
89 | return new EventRule(eventName, logLevelSelector, firstPart); | |
90 | } | |
91 | ||
92 | /* | |
93 | * If there is both a filter and a log level, the filter + event name is | |
94 | * "resolved" first. | |
95 | */ | |
96 | StringJoiner sj2 = new StringJoiner(") && (", "(", ")"); | |
97 | sj2.add(firstPart); | |
98 | sj2.add(filterStringFromLogLevel(logLevelSelector)); | |
99 | return new EventRule(eventName, logLevelSelector, sj2.toString()); | |
100 | } | |
101 | ||
102 | /** | |
103 | * Construct an event rule corresponding to enabling all (-a) events. | |
104 | * | |
105 | * @return The corresponding event rule | |
106 | */ | |
107 | public static EventRule createRuleAllEvents() { | |
108 | return new EventRule(EVENT_NAME_ALL, LOG_LEVEL_UNSPECIFIED, ""); | |
109 | } | |
110 | ||
111 | private static String filterStringFromEventName(String eventName) { | |
112 | return "logger_name == \"" + eventName + "\""; | |
113 | } | |
114 | ||
115 | private static String filterStringFromLogLevel(LogLevelSelector logLevelSelector) { | |
116 | StringBuilder sb = new StringBuilder(); | |
117 | sb.append("int_loglevel "); | |
118 | ||
119 | switch (logLevelSelector.getLogLevelType()) { | |
120 | case LTTNG_EVENT_LOGLEVEL_RANGE: | |
121 | sb.append(">="); | |
122 | break; | |
123 | case LTTNG_EVENT_LOGLEVEL_SINGLE: | |
124 | sb.append("=="); | |
125 | break; | |
126 | case LTTNG_EVENT_LOGLEVEL_ALL: | |
127 | default: | |
128 | throw new IllegalArgumentException(); | |
129 | } | |
130 | ||
131 | sb.append(" " + logLevelSelector.getLogLevel()); | |
132 | return sb.toString(); | |
133 | } | |
134 | ||
135 | } |