third_party/WebKit/public/platform/WebRTCStatsRequest.h

   1 /*
   2  * Copyright (C) 2012 Google Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
  13  * distribution.
  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #ifndef WebRTCStatsRequest_h
  32 #define WebRTCStatsRequest_h
  33
  34 #include "WebCommon.h"
  35 #include "WebPrivatePtr.h"
  36 #include "WebString.h"
  37
  38 namespace blink {
  39
  40 class RTCStatsRequest;
  41 class WebMediaStreamTrack;
  42 class WebMediaStream;
  43 class WebRTCStatsResponse;
  44
  45 // The WebRTCStatsRequest class represents a JavaScript call on
  46 // RTCPeerConnection.getStats(). The user of this API will use
  47 // the calls on this class and WebRTCStatsResponse to fill in the
  48 // data that will be returned via a callback to the user in an
  49 // RTCStatsResponse structure.
  50 //
  51 // The typical usage pattern is:
  52 // WebRTCStatsRequest request = <from somewhere>
  53 // WebRTCStatsResponse response = request.createResponse();
  54 //
  55 // For each item on which statistics are going to be reported:
  56 //   size_t reportIndex = response.addReport();
  57 //   Add local information:
  58 //   size_t elementIndex = response.addElement(reportIndex, true, dateNow());
  59 //   For each statistic being reported on:
  60 //     response.addStatistic(reportIndex, true, elementIndex,
  61 //                           "name of statistic", "statistic value");
  62 //   Remote information (typically RTCP-derived) is added in the same way.
  63 // When finished adding information:
  64 // request.requestSucceeded(response);
  65
  66 class WebRTCStatsRequest {
  67 public:
  68     WebRTCStatsRequest() { }
  69     WebRTCStatsRequest(const WebRTCStatsRequest& other) { assign(other); }
  70     ~WebRTCStatsRequest() { reset(); }
  71
  72     WebRTCStatsRequest& operator=(const WebRTCStatsRequest& other)
  73     {
  74         assign(other);
  75         return *this;
  76     }
  77
  78     BLINK_PLATFORM_EXPORT void assign(const WebRTCStatsRequest&);
  79
  80     BLINK_PLATFORM_EXPORT void reset();
  81
  82     // This function returns true if a selector argument was given to getStats.
  83     BLINK_PLATFORM_EXPORT bool hasSelector() const;
  84
  85     // The component() accessor give the information
  86     // required to look up a MediaStreamTrack implementation.
  87     // It is only useful to call it when hasSelector() returns true.
  88     BLINK_PLATFORM_EXPORT const WebMediaStreamTrack component() const;
  89
  90     BLINK_PLATFORM_EXPORT void requestSucceeded(const WebRTCStatsResponse&) const;
  91
  92     BLINK_PLATFORM_EXPORT WebRTCStatsResponse createResponse() const;
  93
  94 #if INSIDE_BLINK
  95     BLINK_PLATFORM_EXPORT WebRTCStatsRequest(RTCStatsRequest*);
  96 #endif
  97
  98 private:
  99     WebPrivatePtr<RTCStatsRequest> m_private;
 100 };
 101
 102 } // namespace blink
 103
 104 #endif // WebRTCStatsRequest_h