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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.
#ifndef CONTENT_BROWSER_TRACE_CONTROLLER_IMPL_H_
#define CONTENT_BROWSER_TRACE_CONTROLLER_IMPL_H_
#include <set>
#include <string>
#include <vector>
#include "base/debug/trace_event.h"
#include "base/memory/singleton.h"
#include "content/public/browser/trace_controller.h"
class CommandLine;
class TraceMessageFilter;
namespace content {
class TraceControllerImpl : public TraceController {
public:
static TraceControllerImpl* GetInstance();
// Called on the main thread of the browser process to initialize
// startup tracing.
void InitStartupTracing(const CommandLine& command_line);
// Get set of known categories. This can change as new code paths are reached.
// If true is returned, subscriber->OnKnownCategoriesCollected will be called
// once the categories are retrieved from child processes.
bool GetKnownCategoriesAsync(TraceSubscriber* subscriber);
// Same as above, but specifies which categories to trace.
// If both included_categories and excluded_categories are empty,
// all categories are traced.
// Else if included_categories is non-empty, only those are traced.
// Else if excluded_categories is non-empty, everything but those are traced.
bool BeginTracing(TraceSubscriber* subscriber,
const std::vector<std::string>& included_categories,
const std::vector<std::string>& excluded_categories);
// TraceController implementation:
virtual bool BeginTracing(TraceSubscriber* subscriber,
const std::string& categories) OVERRIDE;
virtual bool EndTracingAsync(TraceSubscriber* subscriber) OVERRIDE;
virtual bool GetTraceBufferPercentFullAsync(
TraceSubscriber* subscriber) OVERRIDE;
virtual void CancelSubscriber(TraceSubscriber* subscriber) OVERRIDE;
private:
typedef std::set<scoped_refptr<TraceMessageFilter> > FilterMap;
friend struct DefaultSingletonTraits<TraceControllerImpl>;
friend class ::TraceMessageFilter;
TraceControllerImpl();
virtual ~TraceControllerImpl();
bool is_tracing_enabled() const {
return can_end_tracing();
}
bool can_end_tracing() const {
return is_tracing_ && pending_end_ack_count_ == 0;
}
// Can get Buffer Percent Full
bool can_get_buffer_percent_full() const {
return is_tracing_ &&
pending_end_ack_count_ == 0 &&
pending_bpf_ack_count_ == 0;
}
bool can_begin_tracing(TraceSubscriber* subscriber) const {
return !is_tracing_ &&
(subscriber_ == NULL || subscriber == subscriber_);
}
// Methods for use by TraceMessageFilter.
void AddFilter(TraceMessageFilter* filter);
void RemoveFilter(TraceMessageFilter* filter);
void OnTracingBegan(TraceSubscriber* subscriber);
void OnEndTracingAck(const std::vector<std::string>& known_categories);
void OnTraceDataCollected(
const scoped_refptr<base::RefCountedString>& events_str_ptr);
void OnTraceBufferFull();
void OnTraceBufferPercentFullReply(float percent_full);
FilterMap filters_;
TraceSubscriber* subscriber_;
// Pending acks for EndTracingAsync:
int pending_end_ack_count_;
// Pending acks for GetTraceBufferPercentFullAsync:
int pending_bpf_ack_count_;
float maximum_bpf_;
bool is_tracing_;
bool is_get_categories_;
std::set<std::string> known_categories_;
std::vector<std::string> included_categories_;
std::vector<std::string> excluded_categories_;
DISALLOW_COPY_AND_ASSIGN(TraceControllerImpl);
};
} // namespace content
#endif // CONTENT_BROWSER_TRACE_CONTROLLER_IMPL_H_
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