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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">
<erlref>
<header>
<copyright>
<year>2002</year><year>2016</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</title>
<prepared>Håkan Mattsson</prepared>
<responsible>Håkan Mattsson</responsible>
<docno></docno>
<approved>Håkan Mattsson</approved>
<checked></checked>
<date></date>
<rev>%VSN%</rev>
<file>et</file>
</header>
<module>et</module>
<modulesummary>Main API of the Event Trace (ET) application</modulesummary>
<description>
<p>Interface module for the Event Trace (ET) application</p>
</description>
<funcs>
<func>
<name since="OTP R13B04">trace_me(DetailLevel, From, To, Label, Contents) -> hopefully_traced</name>
<fsummary>A function that is intended to be traced.</fsummary>
<type>
<v>DetailLevel = integer(X) when X =< 0, X >= 100</v>
<v>From = actor()</v>
<v>To = actor()</v>
<v>Label = atom() | string() | term()</v>
<v>Contents = [{Key, Value}] | term()</v>
<v>actor() = term()</v>
</type>
<desc>
<p>A function that is intended to be traced.</p>
<p>This function is intended to be invoked at strategic places
in user applications in order to enable simplified
tracing. The functions are extremely light weight as they do
nothing besides returning an atom. The functions are designed
for being traced. The global tracing mechanism in
<c>et_collector</c> defaults to set its trace pattern to these
functions.</p>
<p>The label is intended to provide a brief summary of the
event. It is preferred to use an atom but a string would also
do.</p>
<p>The contents can be any term but in order to simplify
post processing of the traced events, a plain list
of {Key, Value} tuples is preferred.</p>
<p>Some events, such as messages, are directed from some actor to another.
Other events (termed actions) may be undirected and only have one actor.</p>
</desc>
</func>
<func>
<name since="OTP R13B04">trace_me(DetailLevel, FromTo, Label, Contents) -> hopefully_traced</name>
<fsummary>A function that is intended to be traced.</fsummary>
<desc>
<p>Invokes <c>et:trace_me/5</c> with both <c>From</c> and <c>To</c>
set to <c>FromTo</c>.</p>
</desc>
</func>
<func>
<name>phone_home(DetailLevel, FromTo, Label, Contents) -> hopefully_traced</name>
<name>phone_home(DetailLevel, From, To, Label, Contents) -> hopefully_traced</name>
<fsummary>Send a signal to the outer space</fsummary>
<desc>
<p>These functions sends a signal to the outer space and the
caller hopes that someone is listening. In other words, they
invoke <c>et:trace_me/4</c> and <c>et:trace_me/5</c>
respectively.</p>
</desc>
</func>
<func>
<name>report_event(DetailLevel, FromTo, Label, Contents) -> hopefully_traced</name>
<name>report_event(DetailLevel, From, To, Label, Contents) -> hopefully_traced</name>
<fsummary>Deprecated functions</fsummary>
<desc>
<p>Deprecated functions which for the time being are kept for
backwards compatibility. Invokes <c>et:trace_me/4</c> and
<c>et:trace_me/5</c> respectively.</p>
</desc>
</func>
</funcs>
</erlref>
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