A proposal and implementation for an initial postMessage interface. These in...

ppapi/cpp/module.cc

 // Copyright (c) 2010 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.
 
 // Note that the single accessor, Module::Get(), is not actually implemented
 // in this file.  This is an intentional hook that allows users of ppapi's
 // C++ wrapper objects to provide difference semantics for how the singleton
 // object is accessed.
 //
 // In general, users of ppapi will also link in ppp_entrypoints.cc, which
 // provides a simple default implementation of Module::Get().
 //
 // A notable exception where the default ppp_entrypoints will not work is
 // when implementing "internal plugins" that are statically linked into the
 // browser. In this case, the process may actually have multiple Modules
 // loaded at once making a traditional "singleton" unworkable.  To get around
 // this, the users of ppapi need to get creative about how to properly
 // implement the Module::Get() so that ppapi's C++ wrappers can find the
 // right Module object.  One example solution is to use thread local storage
 // to change the Module* returned based on which thread is invoking the
 // function. Leaving Module::Get() unimplemented provides a hook for
 // implementing such behavior.
 
 #include "ppapi/cpp/module.h"
 
 #include <string.h>
 
+#include "ppapi/c/dev/ppp_messaging_dev.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/ppp_instance.h"
 #include "ppapi/cpp/common.h"
 #include "ppapi/cpp/url_loader.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/rect.h"
 #include "ppapi/cpp/resource.h"
 #include "ppapi/cpp/var.h"
 
@@ skipping 89 matching lines @@
 static PPP_Instance instance_interface = {
   &Instance_DidCreate,
   &Instance_DidDestroy,
   &Instance_DidChangeView,
   &Instance_DidChangeFocus,
   &Instance_HandleInputEvent,
   &Instance_HandleDocumentLoad,
   &Instance_GetInstanceObject
 };
 
+void Messaging_HandleMessage(PP_Instance pp_instance, PP_Var var) {
+  Module* module_singleton = Module::Get();
+  if (!module_singleton)
+    return;
+  Instance* instance = module_singleton->InstanceForPPInstance(pp_instance);
+  if (!instance)
+    return;
+  instance->HandleMessage(Var(Var::PassRef(), var));
+}
+
+static PPP_Messaging_Dev instance_messaging_interface = {
+  &Messaging_HandleMessage
+};
+
 // Module ----------------------------------------------------------------------
 
 Module::Module() : pp_module_(0), get_browser_interface_(NULL), core_(NULL) {
 }
 
 Module::~Module() {
   delete core_;
   core_ = NULL;
 }
 
 bool Module::Init() {
   return true;
 }
 
 const void* Module::GetPluginInterface(const char* interface_name) {
   if (strcmp(interface_name, PPP_INSTANCE_INTERFACE) == 0)
     return &instance_interface;
 
+  if (strcmp(interface_name, PPP_MESSAGING_DEV_INTERFACE) == 0)
+    return &instance_messaging_interface;
+
   // Now see if anything was dynamically registered.
   InterfaceMap::const_iterator found = additional_interfaces_.find(
       std::string(interface_name));
   if (found != additional_interfaces_.end())
     return found->second;
 
   return NULL;
 }
 
 const void* Module::GetBrowserInterface(const char* interface_name) {
@@ skipping 30 matching lines @@
   const PPB_Core* core = reinterpret_cast<const PPB_Core*>(GetBrowserInterface(
       PPB_CORE_INTERFACE));
   if (!core)
     return false;
   core_ = new Core(core);
 
   return Init();
 }
 
 }  // namespace pp