2 * Copyright (C) 2015, EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
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.
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.
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.
19 package org
.lttng
.ust
.agent
.utils
;
21 import java
.util
.StringJoiner
;
23 import org
.lttng
.ust
.agent
.session
.EventRule
;
24 import org
.lttng
.ust
.agent
.session
.LogLevelSelector
;
27 * Factory class for {@link EventRule} objects, offering convenience methods
28 * that mimic the results of passing the given arguments on the command-line.
30 * @author Alexandre Montplaisir
32 public final class EventRuleFactory
{
34 /** Name of the "all" (-a) event */
35 public static final String EVENT_NAME_ALL
= "*";
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);
40 private EventRuleFactory() {}
43 * Construct an event by only passing the event name on the command-line.
47 * @return The corresponding event rule
49 public static EventRule
createRule(String eventName
) {
50 return new EventRule(eventName
, LOG_LEVEL_UNSPECIFIED
, filterStringFromEventName(eventName
));
54 * Construct and event rule by specifying the event name and log level.
58 * @param logLevelSelector
60 * @return The corresponding event rule
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
))
67 return new EventRule(eventName
, logLevelSelector
, filterStr
);
71 * Construct and event rule by specifying the event name, log level, and a
76 * @param logLevelSelector
79 * The filter string passed on the command-line
80 * @return The corresponding event rule
82 public static EventRule
createRule(String eventName
, LogLevelSelector logLevelSelector
, String extraFilter
) {
83 StringJoiner sj1
= new StringJoiner(") && (", "(", ")");
85 sj1
.add(filterStringFromEventName(eventName
));
86 String firstPart
= sj1
.toString();
88 if (logLevelSelector
.equals(LOG_LEVEL_UNSPECIFIED
)) {
89 return new EventRule(eventName
, logLevelSelector
, firstPart
);
93 * If there is both a filter and a log level, the filter + event name is
96 StringJoiner sj2
= new StringJoiner(") && (", "(", ")");
98 sj2
.add(filterStringFromLogLevel(logLevelSelector
));
99 return new EventRule(eventName
, logLevelSelector
, sj2
.toString());
103 * Construct an event rule corresponding to enabling all (-a) events.
105 * @return The corresponding event rule
107 public static EventRule
createRuleAllEvents() {
108 return new EventRule(EVENT_NAME_ALL
, LOG_LEVEL_UNSPECIFIED
, "");
111 private static String
filterStringFromEventName(String eventName
) {
112 return "logger_name == \"" + eventName
+ "\"";
115 private static String
filterStringFromLogLevel(LogLevelSelector logLevelSelector
) {
116 StringBuilder sb
= new StringBuilder();
117 sb
.append("int_loglevel ");
119 switch (logLevelSelector
.getLogLevelType()) {
120 case LTTNG_EVENT_LOGLEVEL_RANGE
:
123 case LTTNG_EVENT_LOGLEVEL_SINGLE
:
126 case LTTNG_EVENT_LOGLEVEL_ALL
:
128 throw new IllegalArgumentException();
131 sb
.append(" " + logLevelSelector
.getLogLevel());
132 return sb
.toString();