[Presentation API] 1-UA presentation support + presenter APIs.

content/browser/presentation/presentation_service_impl.cc

 // Copyright 2015 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 "content/browser/presentation/presentation_service_impl.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 184 matching lines @@
     return;
 
   scoped_ptr<ScreenAvailabilityListenerImpl> listener(
       new ScreenAvailabilityListenerImpl(availability_url, this));
   if (delegate_->AddScreenAvailabilityListener(
       render_process_id_,
       render_frame_id_,
       listener.get())) {
     screen_availability_listeners_.set(availability_url, listener.Pass());
   } else {
-    DVLOG(1) << "AddScreenAvailabilityListener failed. Ignoring request.";
+    DVLOG(1) << "AddScreenAvailabilityListener failed. Returning false.";
+    client_->OnScreenAvailabilityUpdated(url, false);
   }
 }
 
 void PresentationServiceImpl::StopListeningForScreenAvailability(
     const mojo::String& url) {
   DVLOG(2) << "StopListeningForScreenAvailability " << url;
   if (!delegate_)
     return;
 
   const std::string& availability_url = url.get();
   auto listener_it = screen_availability_listeners_.find(availability_url);
   if (listener_it == screen_availability_listeners_.end())
     return;
 
   delegate_->RemoveScreenAvailabilityListener(
       render_process_id_,
       render_frame_id_,
       listener_it->second);
   screen_availability_listeners_.erase(listener_it);
 }
 
-void PresentationServiceImpl::ListenForDefaultSessionStart(
-    const DefaultSessionMojoCallback& callback) {
-  if (!default_session_start_context_.get())
-    default_session_start_context_.reset(new DefaultSessionStartContext);
-  default_session_start_context_->AddCallback(callback);
-}
-
 void PresentationServiceImpl::StartSession(
     const mojo::String& presentation_url,
     const NewSessionMojoCallback& callback) {
   DVLOG(2) << "StartSession";
   if (!delegate_) {
     callback.Run(
           presentation::PresentationSessionInfoPtr(),
           presentation::PresentationError::From(
               PresentationError(PRESENTATION_ERROR_NO_AVAILABLE_SCREENS,
                                 "No screens found.")));
@@ skipping 115 matching lines @@
   pending_join_session_cbs_.erase(it);
 }
 
 void PresentationServiceImpl::SetDefaultPresentationURL(
     const mojo::String& url) {
   DVLOG(2) << "SetDefaultPresentationURL";
   if (!delegate_)
     return;
 
   const std::string& new_default_url = url.get();
   if (default_presentation_url_ == new_default_url)

[miu, 2015/10/20 00:56:50]

Why is this check here?  It feels like a waste of memory to store a copy of this
string just to de-dupe calls to SetDefaultPresentationURL() with the same url. 
Perhaps the delegate should do this (and only if it really needs to for
correctness)?

[imcheng, 2016/06/13 22:30:01]

It looks like PSDImpl already does some form of deduplication. We can remove the
field and the duplicate checking logic here in a separate patch.

     return;
+
+  default_presentation_url_ = new_default_url;
   delegate_->SetDefaultPresentationUrl(
       render_process_id_,
       render_frame_id_,
-      new_default_url);
-  default_presentation_url_ = new_default_url;
+      default_presentation_url_,
+      base::Bind(&PresentationServiceImpl::OnDefaultPresentationStarted,
+                 weak_factory_.GetWeakPtr()));
 }
 
 void PresentationServiceImpl::SendSessionMessage(
     presentation::PresentationSessionInfoPtr session,
     presentation::SessionMessagePtr session_message,
     const SendMessageMojoCallback& callback) {
   DVLOG(2) << "SendSessionMessage";
   DCHECK(!session_message.is_null());
   // send_message_callback_ should be null by now, otherwise resetting of
   // send_message_callback_ with new callback will drop the old callback.
@@ skipping 64 matching lines @@
   if (!delegate_)
     return;
 
   PresentationSessionInfo session_info(session.To<PresentationSessionInfo>());
   delegate_->ListenForSessionMessages(
       render_process_id_, render_frame_id_, session_info,
       base::Bind(&PresentationServiceImpl::OnSessionMessages,
                  weak_factory_.GetWeakPtr(), session_info));
 }
 
+void PresentationServiceImpl::GetPresentationReceiverSession(
+    const PresentationSessionMojoCallback& callback) {
+  DVLOG(2) << "GetPresentationReceiverSession";
+  DCHECK(receiver_session_callback_.is_null());

[miu, 2015/10/20 00:56:50]

and DCHECK(!callback.is_null())

[imcheng, 2016/06/13 22:30:01]

Done.

+  if (!delegate_) {
+    callback.Run(presentation::PresentationSessionInfoPtr());
+    return;
+  }
+
+  receiver_session_callback_ = callback;
+  delegate_->NotifyWhenReceiverSessionIsAvailable(
+      render_process_id_, render_frame_id_,
+      base::Bind(&PresentationServiceImpl::OnGetPresentationReceiverSession,
+                 weak_factory_.GetWeakPtr()));
+}
+
+void PresentationServiceImpl::OnGetPresentationReceiverSession(
+    const content::PresentationSessionInfo* session_info) {
+  if (!receiver_session_callback_.is_null()) {

[miu, 2015/10/20 00:56:50]

nit: Reduce indent on majority of the code by negating this return statement.
Or, perhaps it should be a DCHECK(!receiver_session_callback_.is_null())?

[imcheng, 2016/06/13 22:30:01]

Removed.

+    receiver_session_callback_.Run(
+        session_info
+            ? presentation::PresentationSessionInfo::From(*session_info)
+            : presentation::PresentationSessionInfoPtr());
+    receiver_session_callback_.reset();
+  }
+}
+
 void PresentationServiceImpl::OnSessionMessages(
     const PresentationSessionInfo& session,
     const ScopedVector<PresentationSessionMessage>& messages,
     bool pass_ownership) {
   DCHECK(client_);
 
   DVLOG(2) << "OnSessionMessages";
   mojo::Array<presentation::SessionMessagePtr> mojoMessages(messages.size());
   for (size_t i = 0; i < messages.size(); ++i)
     mojoMessages[i] = ToMojoSessionMessage(messages[i], pass_ownership);
@@ skipping 46 matching lines @@
   default_presentation_url_.clear();
 
   screen_availability_listeners_.clear();
   session_state_listeners_.clear();
 
   start_session_request_id_ = kInvalidRequestSessionId;
   pending_start_session_cb_.reset();
 
   pending_join_session_cbs_.clear();
 
-  default_session_start_context_.reset();
-
-  if (on_session_messages_callback_.get()) {
+  if (on_session_messages_callback_) {
     on_session_messages_callback_->Run(
         mojo::Array<presentation::SessionMessagePtr>());
     on_session_messages_callback_.reset();
   }
 
   if (send_message_callback_) {
     // Run the callback with false, indicating the renderer to stop sending
     // the requests and invalidate all pending requests.
     send_message_callback_->Run(false);
     send_message_callback_.reset();
   }
+
+  if (!receiver_session_callback_.is_null()) {
+    receiver_session_callback_.Run(presentation::PresentationSessionInfoPtr());
+    receiver_session_callback_.reset();
+  }
 }
 
 void PresentationServiceImpl::OnDelegateDestroyed() {
   DVLOG(2) << "PresentationServiceImpl::OnDelegateDestroyed";
   delegate_ = nullptr;
   Reset();
 }
 
 void PresentationServiceImpl::OnDefaultPresentationStarted(
     const PresentationSessionInfo& session) {
-  if (default_session_start_context_.get())
-    default_session_start_context_->set_session(session);
+  client_->OnDefaultPresentationStarted(
+      presentation::PresentationSessionInfo::From(session));
 }
 
 PresentationServiceImpl::ScreenAvailabilityListenerImpl
 ::ScreenAvailabilityListenerImpl(
     const std::string& availability_url,
     PresentationServiceImpl* service)
     : availability_url_(availability_url),
       service_(service) {
   DCHECK(service_);
   DCHECK(service_->client_.get());
@@ skipping 53 matching lines @@
 }
 
 void PresentationServiceImpl::NewSessionMojoCallbackWrapper::Run(
     presentation::PresentationSessionInfoPtr session,
     presentation::PresentationErrorPtr error) {
   DCHECK(!callback_.is_null());
   callback_.Run(session.Pass(), error.Pass());
   callback_.reset();
 }
 
-PresentationServiceImpl::DefaultSessionStartContext
-::DefaultSessionStartContext() {
-}
-
-PresentationServiceImpl::DefaultSessionStartContext
-::~DefaultSessionStartContext() {
-  Reset();
-}
-
-void PresentationServiceImpl::DefaultSessionStartContext::AddCallback(
-    const DefaultSessionMojoCallback& callback) {
-  if (session_.get()) {
-    DCHECK(callbacks_.empty());
-    callback.Run(presentation::PresentationSessionInfo::From(*session_));
-    session_.reset();
-  } else {
-    callbacks_.push_back(new DefaultSessionMojoCallback(callback));
-  }
-}
-
-void PresentationServiceImpl::DefaultSessionStartContext::set_session(
-    const PresentationSessionInfo& session) {
-  if (callbacks_.empty()) {
-    session_.reset(new PresentationSessionInfo(session));
-  } else {
-    DCHECK(!session_.get());
-    ScopedVector<DefaultSessionMojoCallback> callbacks;
-    callbacks.swap(callbacks_);
-    for (const auto& callback : callbacks)
-      callback->Run(presentation::PresentationSessionInfo::From(session));
-  }
-}
-
-void PresentationServiceImpl::DefaultSessionStartContext::Reset() {
-  ScopedVector<DefaultSessionMojoCallback> callbacks;
-  callbacks.swap(callbacks_);
-  for (const auto& callback : callbacks)
-    callback->Run(presentation::PresentationSessionInfoPtr());
-  session_.reset();
-}
-
 }  // namespace content