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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. | |
4 | |
5 #ifndef CHROME_BROWSER_FEEDBACK_TRACING_MANAGER_H_ | |
6 #define CHROME_BROWSER_FEEDBACK_TRACING_MANAGER_H_ | |
7 | |
8 #include <map> | |
9 #include <string> | |
10 | |
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 | |
16 namespace base { | |
17 | |
18 class RefCountedString; | |
19 class FilePath; | |
20 | |
21 } | |
22 // Callback used for getting the output of a trace. | |
23 typedef base::Callback<void(scoped_refptr<base::RefCountedString> trace_data)> | |
24 TraceDataCallback; | |
25 | |
26 // This class is used to manage performance metrics that can be attached to | |
27 // feedback reports. This class is a Singleton that is owned by the preference | |
28 // system. It should only be created when it is enabled, and should only be | |
29 // accessed elsewhere via Get(). | |
30 // | |
31 // When a performance trace is desired, TracingManager::Get()->RequestTrace() | |
32 // should be invoked. The TracingManager will then start preparing a zipped | |
33 // version of the performance data. That data can then be requested via | |
34 // GetTraceData(). When the data is no longer needed, it should be discarded | |
35 // via DiscardTraceData(). | |
36 class TracingManager { | |
37 public: | |
38 virtual ~TracingManager(); | |
39 | |
40 // Create a TracingManager. Can only be called when none exists. | |
41 static scoped_ptr<TracingManager> Create(); | |
42 | |
43 // Get the current TracingManager. Returns NULL if one doesn't exist. | |
44 static TracingManager* Get(); | |
45 | |
46 // Request a trace ending at the current time. If a trace is already being | |
47 // collected, the id for that trace is returned. | |
48 int RequestTrace(); | |
49 | |
50 // Get the trace data for |id|. On success, true is returned, and the data is | |
51 // returned via |callback|. Returns false on failure. | |
52 bool GetTraceData(int id, const TraceDataCallback& callback); | |
53 | |
54 // Discard the data for trace |id|. | |
55 void DiscardTraceData(int id); | |
56 | |
57 private: | |
58 TracingManager(); | |
59 | |
60 void StartTracing(); | |
61 void OnTraceDataCollected(const base::FilePath& path); | |
62 | |
63 // ID of the trace that is being collected. | |
64 int current_trace_id_; | |
65 | |
66 // Mapping of trace ID to trace data. | |
67 std::map<int, scoped_refptr<base::RefCountedString> > trace_data_; | |
68 | |
69 // Callback for the current trace request. | |
70 TraceDataCallback trace_callback_; | |
71 | |
72 base::WeakPtrFactory<TracingManager> weak_ptr_factory_; | |
73 | |
74 DISALLOW_COPY_AND_ASSIGN(TracingManager); | |
75 }; | |
76 | |
77 #endif // CHROME_BROWSER_FEEDBACK_TRACING_MANAGER_H_ | |
78 | |
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