Implement a proxy for Pepper FileIO.

ppapi/proxy/ppb_file_ref_proxy.cc

 // Copyright (c) 2011 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 "ppapi/proxy/ppb_file_ref_proxy.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "ppapi/c/pp_errors.h"
@@ skipping 14 matching lines @@
 using ppapi::thunk::ResourceCreationAPI;
 
 namespace ppapi {
 namespace proxy {
 
 class FileRef : public FileRefImpl {
  public:
   explicit FileRef(const PPB_FileRef_CreateInfo& info);
   virtual ~FileRef();
 
+  // Resource overrides.
+  virtual void LastPluginRefWasDeleted() OVERRIDE;
+
   // PPB_FileRef_API implementation (not provided by FileRefImpl).
   virtual PP_Resource GetParent() OVERRIDE;
   virtual int32_t MakeDirectory(PP_Bool make_ancestors,
                                 PP_CompletionCallback callback) OVERRIDE;
   virtual int32_t Touch(PP_Time last_access_time,
                         PP_Time last_modified_time,
                         PP_CompletionCallback callback) OVERRIDE;
   virtual int32_t Delete(PP_CompletionCallback callback) OVERRIDE;
   virtual int32_t Rename(PP_Resource new_file_ref,
                          PP_CompletionCallback callback) OVERRIDE;
@@ skipping 19 matching lines @@
   // back here.
   int next_callback_id_;
   typedef std::map<int, PP_CompletionCallback> PendingCallbackMap;
   PendingCallbackMap pending_callbacks_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileRef);
 };
 
 FileRef::FileRef(const PPB_FileRef_CreateInfo& info)
     : FileRefImpl(FileRefImpl::InitAsProxy(), info),
-      next_callback_id_(0) {
+      next_callback_id_(1) {
 }
 
 FileRef::~FileRef() {
+  // The callbacks map should have been cleared by LastPluginRefWasDeleted.
+  DCHECK(pending_callbacks_.empty());
+}
+
+void FileRef::LastPluginRefWasDeleted() {
   // Abort all pending callbacks. Do this by posting a task to avoid reentering
   // the plugin's Release() call that probably deleted this object.
   for (PendingCallbackMap::iterator i = pending_callbacks_.begin();
        i != pending_callbacks_.end(); ++i) {
     MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
         i->second.func, i->second.user_data,
         static_cast<int32_t>(PP_ERROR_ABORTED)));
   }
+  pending_callbacks_.clear();
 }
 
 PP_Resource FileRef::GetParent() {
   PPB_FileRef_CreateInfo create_info;
   GetDispatcher()->Send(new PpapiHostMsg_PPBFileRef_GetParent(
       API_ID_PPB_FILE_REF, host_resource(), &create_info));
   return PPB_FileRef_Proxy::DeserializeFileRef(create_info);
 }
 
 int32_t FileRef::MakeDirectory(PP_Bool make_ancestors,
@@ skipping 212 matching lines @@
     int32_t result,
     const HostResource& host_resource,
     int callback_id) {
   // Execute OnMsgCallbackComplete in the plugin process.
   Send(new PpapiMsg_PPBFileRef_CallbackComplete(
       API_ID_PPB_FILE_REF, host_resource, callback_id, result));
 }
 
 }  // namespace proxy
 }  // namespace ppapi