media: Handle promise resolve/rejection in CdmPromiseAdapter.

media/base/cdm_promise_adapter.cc

 // Copyright 2014 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.
 
 #include "media/base/cdm_promise_adapter.h"
 
 #include "media/base/media_keys.h"
 
 namespace media {
 
 CdmPromiseAdapter::CdmPromiseAdapter() : next_promise_id_(1) {
 }
 
 CdmPromiseAdapter::~CdmPromiseAdapter() {
+  DCHECK(promises_.empty());
+  Clear();
 }
 
 uint32_t CdmPromiseAdapter::SavePromise(scoped_ptr<CdmPromise> promise) {
   uint32_t promise_id = next_promise_id_++;
   promises_.add(promise_id, promise.Pass());
   return promise_id;
 }
 
-scoped_ptr<CdmPromise> CdmPromiseAdapter::TakePromise(uint32_t promise_id) {
-  PromiseMap::iterator it = promises_.find(promise_id);
-  if (it == promises_.end())
-    return nullptr;
-  return promises_.take_and_erase(it);
+template <typename... T>
+void CdmPromiseAdapter::ResolvePromise(uint32_t promise_id,
+                                       const T&... result) {
+  scoped_ptr<CdmPromise> promise = TakePromise(promise_id);
+  if (!promise) {
+    NOTREACHED() << "Promise not found for " << promise_id;
+    return;
+  }
+
+  // Sanity check the type before we do static_cast.
+  CdmPromise::ResolveParameterType type = promise->GetResolveParameterType();
+  CdmPromise::ResolveParameterType expected = CdmPromiseTraits<T...>::kType;
+  if (type != expected) {
+    NOTREACHED() << "Promise type mismatch: " << type << " vs " << expected;
+    return;
+  }
+
+  static_cast<CdmPromiseTemplate<T...>*>(promise.get())->resolve(result...);
+}
+
+void CdmPromiseAdapter::RejectPromise(
+    uint32_t promise_id,
+    MediaKeys::Exception exception_code,
+    uint32 system_code,
+    const std::string& error_message) {
+  scoped_ptr<CdmPromise> promise = TakePromise(promise_id);
+  if (!promise) {
+    NOTREACHED()  << "No promise found for promise_id " << promise_id;
+    return;
+  }
+
+  promise->reject(exception_code, system_code, error_message);
 }
 
 void CdmPromiseAdapter::Clear() {
   // Reject all outstanding promises.
   for (auto& promise : promises_)
     promise.second->reject(MediaKeys::UNKNOWN_ERROR, 0, "Operation aborted.");
   promises_.clear();
 }
 
+scoped_ptr<CdmPromise> CdmPromiseAdapter::TakePromise(uint32_t promise_id) {
+  PromiseMap::iterator it = promises_.find(promise_id);
+  if (it == promises_.end())
+    return nullptr;
+  return promises_.take_and_erase(it);
+}
+
+// Explicit instantiation of function templates.
+template MEDIA_EXPORT void CdmPromiseAdapter::ResolvePromise(uint32_t);
+template MEDIA_EXPORT void CdmPromiseAdapter::ResolvePromise(
+    uint32_t,
+    const std::string&);
+
 }  // namespace media