src/third_party/WebKit/Source/core/inspector/InspectorTracingAgent.cpp

   1 //
   2 // Copyright 2014 The Chromium Authors. All rights reserved.
   3 // Use of this source code is governed by a BSD-style license that can be
   4 // found in the LICENSE file.
   5 //
   6
   7 #include "config.h"
   8
   9 #include "core/inspector/InspectorTracingAgent.h"
  10
  11 #include "core/inspector/IdentifiersFactory.h"
  12 #include "core/inspector/InspectorClient.h"
  13 #include "core/inspector/InspectorState.h"
  14 #include "core/inspector/InspectorWorkerAgent.h"
  15 #include "platform/TraceEvent.h"
  16
  17 namespace blink {
  18
  19 namespace TracingAgentState {
  20 const char sessionId[] = "sessionId";
  21 const char tracingStarted[] = "tracingStarted";
  22 }
  23
  24 namespace {
  25 const char devtoolsMetadataEventCategory[] = TRACE_DISABLED_BY_DEFAULT("devtools.timeline");
  26 }
  27
  28 InspectorTracingAgent::InspectorTracingAgent(InspectorClient* client, InspectorWorkerAgent* workerAgent)
  29     : InspectorBaseAgent<InspectorTracingAgent>("Tracing")
  30     , m_layerTreeId(0)
  31     , m_client(client)
  32     , m_frontend(0)
  33     , m_workerAgent(workerAgent)
  34 {
  35 }
  36
  37 void InspectorTracingAgent::restore()
  38 {
  39     emitMetadataEvents();
  40 }
  41
  42 void InspectorTracingAgent::start(ErrorString*, const String& categoryFilter, const String&, const double*)
  43 {
  44     if (m_state->getBoolean(TracingAgentState::tracingStarted))
  45         return;
  46     m_state->setString(TracingAgentState::sessionId, IdentifiersFactory::createIdentifier());
  47     m_state->setBoolean(TracingAgentState::tracingStarted, true);
  48     m_client->enableTracing(categoryFilter);
  49     emitMetadataEvents();
  50 }
  51
  52 void InspectorTracingAgent::end(ErrorString* errorString)
  53 {
  54     m_client->disableTracing();
  55     m_state->setBoolean(TracingAgentState::tracingStarted, false);
  56     m_workerAgent->setTracingSessionId(String());
  57 }
  58
  59 String InspectorTracingAgent::sessionId()
  60 {
  61     return m_state->getString(TracingAgentState::sessionId);
  62 }
  63
  64 void InspectorTracingAgent::emitMetadataEvents()
  65 {
  66     if (!m_state->getBoolean(TracingAgentState::tracingStarted))
  67         return;
  68     TRACE_EVENT_INSTANT1(devtoolsMetadataEventCategory, "TracingStartedInPage", "sessionId", sessionId().utf8());
  69     if (m_layerTreeId)
  70         setLayerTreeId(m_layerTreeId);
  71     m_workerAgent->setTracingSessionId(sessionId());
  72 }
  73
  74 void InspectorTracingAgent::setLayerTreeId(int layerTreeId)
  75 {
  76     m_layerTreeId = layerTreeId;
  77     TRACE_EVENT_INSTANT2(devtoolsMetadataEventCategory, "SetLayerTreeId", "sessionId", sessionId().utf8(), "layerTreeId", m_layerTreeId);
  78 }
  79
  80 void InspectorTracingAgent::setFrontend(InspectorFrontend* frontend)
  81 {
  82     m_frontend = frontend->tracing();
  83 }
  84
  85 }