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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/test/base/tracing.h"
#include "base/debug/trace_event.h"
#include "base/memory/singleton.h"
#include "base/message_loop/message_loop.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/trace_controller.h"
#include "content/public/browser/trace_subscriber.h"
#include "content/public/test/test_utils.h"
namespace {
using content::BrowserThread;
class InProcessTraceController : public content::TraceSubscriber {
public:
static InProcessTraceController* GetInstance() {
return Singleton<InProcessTraceController>::get();
}
InProcessTraceController()
: is_waiting_on_watch_(false),
watch_notification_count_(0) {}
virtual ~InProcessTraceController() {}
bool BeginTracing(const std::string& category_patterns) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
return content::TraceController::GetInstance()->BeginTracing(
this, category_patterns, base::debug::TraceLog::RECORD_UNTIL_FULL);
}
bool BeginTracingWithWatch(const std::string& category_patterns,
const std::string& category_name,
const std::string& event_name,
int num_occurrences) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(num_occurrences > 0);
watch_notification_count_ = num_occurrences;
return BeginTracing(category_patterns) &&
content::TraceController::GetInstance()->SetWatchEvent(
this, category_name, event_name);
}
bool WaitForWatchEvent(base::TimeDelta timeout) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (watch_notification_count_ == 0)
return true;
if (timeout != base::TimeDelta()) {
timer_.Start(FROM_HERE, timeout, this,
&InProcessTraceController::Timeout);
}
is_waiting_on_watch_ = true;
message_loop_runner_ = new content::MessageLoopRunner;
message_loop_runner_->Run();
is_waiting_on_watch_ = false;
return watch_notification_count_ == 0;
}
bool EndTracing(std::string* json_trace_output) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
using namespace base::debug;
TraceResultBuffer::SimpleOutput output;
trace_buffer_.SetOutputCallback(output.GetCallback());
trace_buffer_.Start();
if (!content::TraceController::GetInstance()->EndTracingAsync(this))
return false;
// Wait for OnEndTracingComplete() to quit the message loop.
// OnTraceDataCollected may be called multiple times while blocking here.
message_loop_runner_ = new content::MessageLoopRunner;
message_loop_runner_->Run();
trace_buffer_.Finish();
trace_buffer_.SetOutputCallback(TraceResultBuffer::OutputCallback());
*json_trace_output = output.json_output;
// Watch notifications can occur during this method's message loop run, but
// not after, so clear them here.
watch_notification_count_ = 0;
return true;
}
private:
friend struct DefaultSingletonTraits<InProcessTraceController>;
// TraceSubscriber implementation
virtual void OnEndTracingComplete() OVERRIDE {
message_loop_runner_->Quit();
}
// TraceSubscriber implementation
virtual void OnTraceDataCollected(
const scoped_refptr<base::RefCountedString>& trace_fragment) OVERRIDE {
trace_buffer_.AddFragment(trace_fragment->data());
}
// TraceSubscriber implementation
virtual void OnEventWatchNotification() OVERRIDE {
if (watch_notification_count_ == 0)
return;
if (--watch_notification_count_ == 0) {
timer_.Stop();
if (is_waiting_on_watch_)
message_loop_runner_->Quit();
}
}
void Timeout() {
DCHECK(is_waiting_on_watch_);
message_loop_runner_->Quit();
}
// For collecting trace data asynchronously.
base::debug::TraceResultBuffer trace_buffer_;
scoped_refptr<content::MessageLoopRunner> message_loop_runner_;
base::OneShotTimer<InProcessTraceController> timer_;
bool is_waiting_on_watch_;
int watch_notification_count_;
DISALLOW_COPY_AND_ASSIGN(InProcessTraceController);
};
} // namespace
namespace tracing {
bool BeginTracing(const std::string& category_patterns) {
return InProcessTraceController::GetInstance()->BeginTracing(
category_patterns);
}
bool BeginTracingWithWatch(const std::string& category_patterns,
const std::string& category_name,
const std::string& event_name,
int num_occurrences) {
return InProcessTraceController::GetInstance()->BeginTracingWithWatch(
category_patterns, category_name, event_name, num_occurrences);
}
bool WaitForWatchEvent(base::TimeDelta timeout) {
return InProcessTraceController::GetInstance()->WaitForWatchEvent(timeout);
}
bool EndTracing(std::string* json_trace_output) {
return InProcessTraceController::GetInstance()->EndTracing(json_trace_output);
}
} // namespace tracing
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