1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CHROME_BROWSER_FEEDBACK_TRACING_MANAGER_H_
6 #define CHROME_BROWSER_FEEDBACK_TRACING_MANAGER_H_
11 #include "base/basictypes.h"
12 #include "base/callback.h"
13 #include "base/memory/scoped_ptr.h"
14 #include "base/memory/weak_ptr.h"
15 #include "content/public/browser/trace_subscriber.h"
17 // Callback used for getting the output of a trace.
18 typedef base::Callback<void(scoped_refptr<base::RefCountedString> trace_data)>
21 // This class is used to manage performance meterics that can be attached to
22 // feedback reports. This class is a Singleton that is owned by the preference
23 // system. It should only be created when it is enabled, and should only be
24 // accessed elsewhere via Get().
26 // When a performance trace is desired, TracingManager::Get()->RequestTrace()
27 // should be invoked. The TracingManager will then start preparing a zipped
28 // version of the performance data. That data can then be requested via
29 // GetTraceData(). When the data is no longer needed, it should be discarded
30 // via DiscardTraceData().
31 class TracingManager : public content::TraceSubscriber {
33 virtual ~TracingManager();
35 // Create a TracingManager. Can only be called when none exists.
36 static scoped_ptr<TracingManager> Create();
38 // Get the current TracingManager. Returns NULL if one doesn't exist.
39 static TracingManager* Get();
41 // Request a trace ending at the current time. If a trace is already being
42 // collected, the id for that trace is returned.
45 // Get the trace data for |id|. On success, true is returned, and the data is
46 // returned via |callback|. Returns false on failure.
47 bool GetTraceData(int id, const TraceDataCallback& callback);
49 // Discard the data for trace |id|.
50 void DiscardTraceData(int id);
55 // content::TraceSubscriber overrides
56 virtual void OnEndTracingComplete() OVERRIDE;
57 virtual void OnTraceDataCollected(
58 const scoped_refptr<base::RefCountedString>& trace_fragment) OVERRIDE;
62 // Data being collected from the current trace.
65 // ID of the trace that is being collected.
66 int current_trace_id_;
68 // Mapping of trace ID to trace data.
69 std::map<int, scoped_refptr<base::RefCountedString> > trace_data_;
71 // Callback for the current trace request.
72 TraceDataCallback trace_callback_;
74 base::WeakPtrFactory<TracingManager> weak_ptr_factory_;
76 DISALLOW_COPY_AND_ASSIGN(TracingManager);
79 #endif // CHROME_BROWSER_FEEDBACK_TRACING_MANAGER_H_