<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">

<erlref>
  <header>
    <copyright>
      <year>2002</year><year>2021</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_viewer</title>
    <prepared>H&aring;kan Mattsson</prepared>
    <responsible>H&aring;kan Mattsson</responsible>
    <docno></docno>
    <approved>H&aring;kan Mattsson</approved>
    <checked></checked>
    <date></date>
    <rev>%VSN%</rev>
    <file>et_viewer.xml</file>
  </header>
  <module since="">et_viewer</module>
  <modulesummary>Displays a sequence chart for trace events (messages/actions)</modulesummary>
  <description>
    <p></p>
  </description>
  <funcs>
    <func>
      <name since="">file(FileName) -> {ok, ViewerPid} | {error, Reason}</name>
      <fsummary>Start a new event viewer and a corresponding collector and load them with trace events from a trace file.</fsummary>
      <type>
        <v>FileName() = string()</v>
        <v>ViewerPid = pid()</v>
        <v>Reason = term()</v>
      </type>
      <desc>
        <p>Start a new event viewer and a corresponding collector
          and load them with trace events from a trace file.</p>
      </desc>
    </func>
    <func>
      <name since="">start() -> ok</name>
      <fsummary>Simplified start of a sequence chart viewer with global tracing activated.</fsummary>
      <desc>
        <p>Simplified start of a sequence chart viewer with
          global tracing activated.</p>
        <p>Convenient to be used from the command line
          (erl -s et_viewer).</p>
      </desc>
    </func>
    <func>
      <name since="">start(Options) -> ok</name>
      <fsummary>Start of a sequence chart viewer without linking to the parent process.</fsummary>
      <desc>
        <p>Start of a sequence chart viewer without linking
          to the parent process.</p>
      </desc>
    </func>
    <func>
      <name since="">start_link(Options) -> {ok, ViewerPid} | {error, Reason}</name>
      <fsummary>Start a sequence chart viewer for trace events (messages/actions)</fsummary>
      <type>
        <v>Options = [option() | collector_option()]</v>
        <v>option() = {parent_pid, extended_pid()} | {title, term()} | {detail_level, detail_level()} | {is_suspended, boolean()} | {scale, integer()} | {width, integer()} | {height, integer()} | {collector_pid, extended_pid()} | {event_order, event_order()} | {active_filter, atom()} | {max_actors, extended_integer()} | {trace_pattern, et_collector_trace_pattern()} | {trace_port, et_collector_trace_port()} | {trace_global, et_collector_trace_global()} | {trace_client, et_collector_trace_client()} | {dict_insert, {filter, filter_name()}, event_filter_fun()} | {dict_insert, et_collector_dict_key(), et_collector_dict_val()} | {dict_delete, {filter, filter_name()}} | {dict_delete, et_collector_dict_key()} | {actors, actors()} | {first_event, first_key()} | {hide_unknown, boolean()} | {hide_actions, boolean()} | {display_mode, display_mode()}</v>
        <v>extended_pid() = pid() | undefined</v>
        <v>detail_level() = min | max | integer(X) when X >=0, X =&lt; 100</v>
        <v>event_order() = trace_ts | event_ts</v>
        <v>extended_integer() = integer() | infinity</v>
        <v>display_mode() = all | {search_actors, direction(), first_key(), actors()}</v>
        <v>direction() = forward | reverse</v>
        <v>first_key() = event_key()</v>
        <v>actors() = [term()]</v>
        <v></v>
        <v>filter_name() = atom()</v>
        <v>filter_fun() =  fun(Event) -> false | true | {true, NewEvent}</v>
        <v>Event = NewEvent = record(event)</v>
        <v>ViewerPid = pid()</v>
        <v>Reason = term()</v>
      </type>
      <desc>
        <p>Start a sequence chart viewer for trace events
          (messages/actions)</p>
        <p>A filter_fun() takes an event record as sole argument
          and returns false | true | {true, NewEvent}.</p>
        <p>If the <c>collector_pid</c> is <c>undefined</c> a new 
          <c>et_collector</c> will be started with the following
          parameter settings: <c>parent_pid</c>, <c>event_order</c>,
          <c>trace_global</c>, <c>trace_pattern</c>, <c>trace_port</c>, <c>trace_max_queue</c>,
          <c>trace_client</c>, <c>dict_insert</c> and <c>dict_delete</c>.
          The new <c>et_viewer</c> will register itself as an <c>et_collector</c> 
          subscriber.
          </p>
        <p>Default values:</p>
        <list type="bulleted">
          <item>parent_pid - self().</item>
          <item>title - "et_viewer".</item>
          <item>detail_level - max.</item>
          <item>is_suspended - false.</item>
          <item>scale - 2.</item>
          <item>width - 800.</item>
          <item>height - 600.</item>
          <item>collector_pid - undefined.</item>
          <item>event_order - trace_ts.</item>
          <item>active_filter - collector.</item>
          <item>max_actors - 5.</item>
          <item>actors - ["UNKNOWN"].</item>
          <item>first_event - first.</item>
          <item>hide_unknown - false.</item>
          <item>hide_actions - false.</item>
          <item>display_mode - all.</item>
        </list>
      </desc>
    </func>
    <func>
      <name since="">get_collector_pid(ViewerPid) -> CollectorPid</name>
      <fsummary>Returns the identifier of the collector process</fsummary>
      <type>
        <v>ViewerPid = pid()</v>
        <v>CollectorPid = pid()</v>
      </type>
      <desc>
        <p>Returns the identifier of the collector process.</p>
      </desc>
    </func>
    <func>
      <name since="">stop(ViewerPid) -> ok</name>
      <fsummary>Stops a viewer</fsummary>
      <type>
        <v>ViewerPid = pid()</v>
      </type>
      <desc>
        <p>Stops a viewer process.</p>
      </desc>
    </func>
  </funcs>
  
</erlref>


