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      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 }
     86