Dispatch IndexedDB IPC messages to worker threads

content/renderer/renderer_webidbcursor_impl.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 "content/renderer/renderer_webidbcursor_impl.h"
 
 #include "content/common/indexed_db_messages.h"
 #include "content/renderer/indexed_db_dispatcher.h"
 #include "content/renderer/render_thread_impl.h"
 
@@ skipping 10 matching lines @@
       prefetch_amount_(kMinPrefetchAmount) {
 }
 
 RendererWebIDBCursorImpl::~RendererWebIDBCursorImpl() {
   // It's not possible for there to be pending callbacks that address this
   // object since inside WebKit, they hold a reference to the object wich owns
   // this object. But, if that ever changed, then we'd need to invalidate
   // any such pointers.
   ChildThread::current()->Send(new IndexedDBHostMsg_CursorDestroyed(
       idb_cursor_id_));
-  IndexedDBDispatcher* dispatcher =
-      RenderThreadImpl::current()->indexed_db_dispatcher();
+  IndexedDBDispatcher* dispatcher = IndexedDBDispatcher::Instance();
   dispatcher->CursorDestroyed(idb_cursor_id_);
 }
 
 unsigned short RendererWebIDBCursorImpl::direction() const {
   int direction;
   ChildThread::current()->Send(
       new IndexedDBHostMsg_CursorDirection(idb_cursor_id_, &direction));
   return direction;
 }
 
 WebIDBKey RendererWebIDBCursorImpl::key() const {
   return key_;
 }
 
 WebIDBKey RendererWebIDBCursorImpl::primaryKey() const {
   return primary_key_;
 }
 
 WebSerializedScriptValue RendererWebIDBCursorImpl::value() const {
   return value_;
 }
 
 void RendererWebIDBCursorImpl::update(const WebSerializedScriptValue& value,
                                       WebIDBCallbacks* callbacks,
                                       WebExceptionCode& ec) {
-  IndexedDBDispatcher* dispatcher =
-      RenderThreadImpl::current()->indexed_db_dispatcher();
+  IndexedDBDispatcher* dispatcher = IndexedDBDispatcher::Instance();
   dispatcher->RequestIDBCursorUpdate(
       content::SerializedScriptValue(value), callbacks, idb_cursor_id_, &ec);
 }
 
 void RendererWebIDBCursorImpl::continueFunction(const WebIDBKey& key,
                                                 WebIDBCallbacks* callbacks,
                                                 WebExceptionCode& ec) {
-  IndexedDBDispatcher* dispatcher =
-      RenderThreadImpl::current()->indexed_db_dispatcher();
+  IndexedDBDispatcher* dispatcher = IndexedDBDispatcher::Instance();
 
   if (key.type() == WebIDBKey::InvalidType) {
     // No key, so this would qualify for a prefetch.
     ++continue_count_;
 
     if (!prefetch_keys_.empty()) {
       // We have a prefetch cache, so serve the result from that.
       CachedContinue(callbacks);
       return;
     }
@@ skipping 14 matching lines @@
     // Key argument supplied. We couldn't prefetch this.
     ResetPrefetchCache();
   }
 
   dispatcher->RequestIDBCursorContinue(IndexedDBKey(key), callbacks,
                                        idb_cursor_id_, &ec);
 }
 
 void RendererWebIDBCursorImpl::deleteFunction(WebIDBCallbacks* callbacks,
                                               WebExceptionCode& ec) {
-  IndexedDBDispatcher* dispatcher =
-      RenderThreadImpl::current()->indexed_db_dispatcher();
+  IndexedDBDispatcher* dispatcher = IndexedDBDispatcher::Instance();
   dispatcher->RequestIDBCursorDelete(callbacks, idb_cursor_id_, &ec);
 }
 
 void RendererWebIDBCursorImpl::postSuccessHandlerCallback()
 {
   pending_onsuccess_callbacks_--;
 
   // If the onsuccess callback called continue() on the cursor again,
   // and that continue was served by the prefetch cache, then
   // pending_onsuccess_callbacks_ would be incremented.
@@ skipping 46 matching lines @@
 
 void RendererWebIDBCursorImpl::ResetPrefetchCache() {
   continue_count_ = 0;
   prefetch_amount_ = kMinPrefetchAmount;
 
   if (!prefetch_keys_.size()) {
     // No prefetch cache, so no need to reset the cursor in the back-end.
     return;
   }
 
-  IndexedDBDispatcher* dispatcher =
-      RenderThreadImpl::current()->indexed_db_dispatcher();
+  IndexedDBDispatcher* dispatcher = IndexedDBDispatcher::Instance();
   dispatcher->RequestIDBCursorPrefetchReset(used_prefetches_,
                                             prefetch_keys_.size(),
                                             idb_cursor_id_);
   prefetch_keys_.clear();
   prefetch_primary_keys_.clear();
   prefetch_values_.clear();
 
   pending_onsuccess_callbacks_ = 0;
 }