media/base/cdm_promise_adapter.cc

   1 // Copyright 2014 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 #include "media/base/cdm_promise_adapter.h"
   6
   7 #include "media/base/media_keys.h"
   8
   9 namespace media {
  10
  11 CdmPromiseAdapter::CdmPromiseAdapter() : next_promise_id_(1) {
  12 }
  13
  14 CdmPromiseAdapter::~CdmPromiseAdapter() {
  15   DCHECK(promises_.empty());
  16   Clear();
  17 }
  18
  19 uint32_t CdmPromiseAdapter::SavePromise(scoped_ptr<CdmPromise> promise) {
  20   uint32_t promise_id = next_promise_id_++;
  21   promises_.add(promise_id, promise.Pass());
  22   return promise_id;
  23 }
  24
  25 template <typename... T>
  26 void CdmPromiseAdapter::ResolvePromise(uint32_t promise_id,
  27                                        const T&... result) {
  28   scoped_ptr<CdmPromise> promise = TakePromise(promise_id);
  29   if (!promise) {
  30     NOTREACHED() << "Promise not found for " << promise_id;
  31     return;
  32   }
  33
  34   // Sanity check the type before we do static_cast.
  35   CdmPromise::ResolveParameterType type = promise->GetResolveParameterType();
  36   CdmPromise::ResolveParameterType expected = CdmPromiseTraits<T...>::kType;
  37   if (type != expected) {
  38     NOTREACHED() << "Promise type mismatch: " << type << " vs " << expected;
  39     return;
  40   }
  41
  42   static_cast<CdmPromiseTemplate<T...>*>(promise.get())->resolve(result...);
  43 }
  44
  45 void CdmPromiseAdapter::RejectPromise(uint32_t promise_id,
  46                                       MediaKeys::Exception exception_code,
  47                                       uint32 system_code,
  48                                       const std::string& error_message) {
  49   scoped_ptr<CdmPromise> promise = TakePromise(promise_id);
  50   if (!promise) {
  51     NOTREACHED() << "No promise found for promise_id " << promise_id;
  52     return;
  53   }
  54
  55   promise->reject(exception_code, system_code, error_message);
  56 }
  57
  58 void CdmPromiseAdapter::Clear() {
  59   // Reject all outstanding promises.
  60   for (auto& promise : promises_)
  61     promise.second->reject(MediaKeys::UNKNOWN_ERROR, 0, "Operation aborted.");
  62   promises_.clear();
  63 }
  64
  65 scoped_ptr<CdmPromise> CdmPromiseAdapter::TakePromise(uint32_t promise_id) {
  66   PromiseMap::iterator it = promises_.find(promise_id);
  67   if (it == promises_.end())
  68     return nullptr;
  69   return promises_.take_and_erase(it);
  70 }
  71
  72 // Explicit instantiation of function templates.
  73 template MEDIA_EXPORT void CdmPromiseAdapter::ResolvePromise(uint32_t);
  74 template MEDIA_EXPORT void CdmPromiseAdapter::ResolvePromise(
  75     uint32_t,
  76     const std::string&);
  77
  78 }  // namespace media