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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">
<erlref>
<header>
<copyright>
<year>2002</year><year>2018</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
</legalnotice>
<title>et_selector</title>
<prepared>Håkan Mattsson</prepared>
<responsible>Håkan Mattsson</responsible>
<docno></docno>
<approved>Håkan Mattsson</approved>
<checked></checked>
<date></date>
<rev>%VSN%</rev>
<file>et_selector.xml</file>
</header>
<module since="">et_selector</module>
<modulesummary>Define event transforms and trace patterns</modulesummary>
<description>
<p></p>
</description>
<funcs>
<func>
<name since="">make_pattern(RawPattern) -> TracePattern</name>
<fsummary>Makes a trace pattern suitable to feed change_pattern/1</fsummary>
<type>
<v>RawPattern = detail_level()</v>
<v>TracePattern = erlang_trace_pattern_match_spec()</v>
<v>detail_level() = min | max | integer(X) when X >= 0, X =< 100</v>
</type>
<desc>
<p>Makes a trace pattern suitable to feed change_pattern/1</p>
<p>Min detail level deactivates tracing of calls to <c>et:trace_me/4,5</c></p>
<p>Max detail level activates tracing of all calls to <c>et:trace_me/4,5</c></p>
<p>integer(X) detail level activates tracing of all calls to
<c>et:trace_me/4,5</c> whose detail level argument is lesser than
X.</p>
<p>See also <c>erlang:trace_pattern/2</c> for more info about its <c>match_spec()</c></p>
</desc>
</func>
<func>
<name since="">change_pattern(Pattern) -> ok</name>
<fsummary>Activates/deactivates tracing by changing the current trace pattern</fsummary>
<type>
<v>Pattern = detail_level() | empty_match_spec() | erlang_trace_pattern_match_spec()</v>
<v>detail_level() = min | max | integer(X) when X >= 0, X =< 100</v>
<v>empty_match_spec() = [] </v>
</type>
<desc>
<p>Activates/deactivates tracing by changing the current trace pattern.</p>
<p><c>min</c> detail level deactivates tracing of calls to <c>et:trace_me/4,5</c></p>
<p><c>max</c> detail level activates tracing of all calls to <c>et:trace_me/4,5</c></p>
<p><c>integer(X)</c> detail level activates tracing of all
calls to <c>et:trace_me/4,5</c> whose detail level argument is
lesser than <c>X</c>.</p>
<p>An empty match spec deactivates tracing of calls to <c>et:trace_me/4,5</c></p>
<p>Other match specs activates tracing of calls to
<c>et:trace_me/4,5</c> accordingly with
<c>erlang:trace_pattern/2</c>.</p>
</desc>
</func>
<func>
<name since="">parse_event(Mod, ValidTraceData) -> false | true | {true, Event}</name>
<fsummary>Transforms trace data and makes an event record out of it</fsummary>
<type>
<v>Mod = module_name() | undefined</v>
<v>module_name() = atom()</v>
<v>ValidTraceData = erlang_trace_data() | record(event)</v>
<v>erlang_trace_data() = {trace, Pid, Label, Info} | {trace, Pid, Label, Info, Extra} | {trace_ts, Pid, Label, Info, ReportedTS} | {trace_ts, Pid, Label, Info, Extra, ReportedTS} | {seq_trace, Label, Info} | {seq_trace, Label, Info, ReportedTS} | {drop, NumberOfDroppedItems}</v>
</type>
<desc>
<p>Transforms trace data and makes an event record out of it.</p>
<p>See <c>erlang:trace/3</c> for more info about the semantics of the
trace data.</p>
<p>An event record consists of the following fields:</p>
<taglist>
<tag><em>detail_level</em></tag>
<item><p>Noise has a high level as opposed to essentials.</p></item>
<tag><em>trace_ts</em></tag>
<item><p>Time when the trace was generated. Same as
event_ts if omitted in trace data.</p></item>
<tag><em>event_ts</em></tag>
<item><p>Time when the event record was created.</p></item>
<tag><em>from</em></tag>
<item><p>From actor, such as sender of a message.</p></item>
<tag><em>to</em></tag>
<item><p>To actor, such as receiver of message.</p></item>
<tag><em>label</em></tag>
<item><p>Label intended to provide a brief event summary.</p></item>
<tag><em>contents</em></tag>
<item><p>All nitty gritty details of the event.</p></item>
</taglist>
<p>See <c>et:trace_me/4</c>and <c>et:trace_me/5</c> for details.</p>
<p>Returns:</p>
<taglist>
<tag><em>{true, Event}</em></tag>
<item><p>where Event is an #event{} record representing the
trace data</p></item>
<tag><em>true</em></tag>
<item><p>means that the trace data already is an event
record and that it is valid as it is. No transformation is
needed.</p></item>
<tag><em>false</em></tag>
<item><p>means that the trace data is uninteresting and
should be dropped</p></item>
</taglist>
</desc>
</func>
</funcs>
</erlref>
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