Framing for a DOMStorage backend that does not depend on in-process-webkit.

webkit/dom_storage/dom_storage_namespace.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.  Use of this
+// Copyright (c) 2012 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/in_process_webkit/dom_storage_namespace.h"
+#include "webkit/dom_storage/dom_storage_namespace.h"
 
-#include "base/file_path.h"
-#include "content/browser/in_process_webkit/dom_storage_area.h"
-#include "content/browser/in_process_webkit/dom_storage_context.h"
-#include "content/browser/in_process_webkit/dom_storage_message_filter.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebStorageArea.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebStorageNamespace.h"
-#include "webkit/glue/webkit_glue.h"
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "webkit/dom_storage/dom_storage_area.h"
 
-using WebKit::WebStorageArea;
-using WebKit::WebStorageNamespace;
-using WebKit::WebString;
+namespace dom_storage {
 
-/* static */
-DOMStorageNamespace* DOMStorageNamespace::CreateLocalStorageNamespace(
-    DOMStorageContext* dom_storage_context, const FilePath& data_dir_path) {
-  int64 id = kLocalStorageNamespaceId;
-  DCHECK(!dom_storage_context->GetStorageNamespace(id, false));
-  return new DOMStorageNamespace(dom_storage_context, id,
-      webkit_glue::FilePathToWebString(data_dir_path), DOM_STORAGE_LOCAL);
+DomStorageNamespace::DomStorageNamespace(
+    int64 namespace_id,
+    const FilePath& directory,  // may be empty
+    DomStorageTaskRunner* task_runner)
+    : namespace_id_(namespace_id),
+      directory_(directory),
+      task_runner_(task_runner) {
 }
 
-/* static */
-DOMStorageNamespace* DOMStorageNamespace::CreateSessionStorageNamespace(
-    DOMStorageContext* dom_storage_context, int64 id) {
-  DCHECK(!dom_storage_context->GetStorageNamespace(id, false));
-  return new DOMStorageNamespace(dom_storage_context, id, WebString(),
-                                 DOM_STORAGE_SESSION);
+DomStorageArea* DomStorageNamespace::OpenStorageArea(const GURL& origin) {
+  if (AreaHolder* holder = GetAreaHolder(origin)) {
+    ++(holder->open_count_);
+    return holder->area_;
+  }
+  // TODO(michaeln): Compute the right filepath.

[benm (inactive), 2012/02/02 16:23:19]

Do you mean whether there should be a backing file or not, something like

namespace_id_ == 0 ? directory_ : FilePath()

?

[michaeln, 2012/02/03 00:33:42]

Done. I see in your CL you've got the 'area' computing the filename and its just
expecting the directory path in the ctor.

I've also made two different 'namespace' ctors, one for localstorage namespaces
and the other for sessionstorage namespaces, that codify and document special id
values and empty directory paths and such.

+  DomStorageArea* area = new DomStorageArea(namespace_id_, origin,
+                                            FilePath(), task_runner_);
+  areas_[origin] = AreaHolder(area, 1);
+  return area;
 }
 
-DOMStorageNamespace::DOMStorageNamespace(DOMStorageContext* dom_storage_context,
-                                         int64 id,
-                                         const WebString& data_dir_path,
-                                         DOMStorageType dom_storage_type)
-    : dom_storage_context_(dom_storage_context),
-      id_(id),
-      data_dir_path_(data_dir_path),
-      dom_storage_type_(dom_storage_type) {
-  DCHECK(dom_storage_context_);
+void DomStorageNamespace::CloseStorageArea(DomStorageArea* area) {
+  AreaHolder* holder = GetAreaHolder(area->origin());
+  DCHECK(holder);
+  DCHECK_EQ(holder->area_.get(), area);
+  --(holder->open_count_);
+  // TODO(michaeln): Clean up areas that aren't needed in memory anymore.
+  // The in-process-webkit based impl didn't do this, but would be nice.
 }
 
-DOMStorageNamespace::~DOMStorageNamespace() {
-  // TODO(jorlow): If the DOMStorageContext is being destructed, there's no need
-  //               to do these calls.  Maybe we should add a fast path?
-  for (OriginToStorageAreaMap::iterator iter(origin_to_storage_area_.begin());
-       iter != origin_to_storage_area_.end(); ++iter) {
-    dom_storage_context_->UnregisterStorageArea(iter->second);
-    delete iter->second;
+DomStorageNamespace* DomStorageNamespace::Clone(int64 clone_namespace_id) {
+  DCHECK_NE(kLocalStorageNamespaceId, namespace_id_);
+  DCHECK_NE(kLocalStorageNamespaceId, clone_namespace_id);
+  DomStorageNamespace* clone =
+      new DomStorageNamespace(clone_namespace_id, FilePath(), task_runner_);
+  AreaMap::const_iterator it = areas_.begin();
+  for (; it != areas_.end(); ++it) {
+    DomStorageArea* area = it->second.area_->ShallowCopy(clone_namespace_id);
+    clone->areas_[it->first] = AreaHolder(area, 0);
   }
+  return clone;
 }
 
-DOMStorageArea* DOMStorageNamespace::GetStorageArea(const string16& origin) {
-  // We may have already created it for another dispatcher host.
-  OriginToStorageAreaMap::iterator iter = origin_to_storage_area_.find(origin);
-  if (iter != origin_to_storage_area_.end())
-    return iter->second;
-
-  // We need to create a new one.
-  int64 id = dom_storage_context_->AllocateStorageAreaId();
-  DCHECK(!dom_storage_context_->GetStorageArea(id));
-  DOMStorageArea* storage_area = new DOMStorageArea(origin, id, this);
-  origin_to_storage_area_[origin] = storage_area;
-  dom_storage_context_->RegisterStorageArea(storage_area);
-  return storage_area;
+DomStorageNamespace::AreaHolder*
+DomStorageNamespace::GetAreaHolder(const GURL& origin) {
+  AreaMap::iterator found = areas_.find(origin);
+  if (found == areas_.end())
+    return NULL;
+  return &(found->second);
 }
 
-DOMStorageNamespace* DOMStorageNamespace::Copy(int64 id) {
-  DCHECK(dom_storage_type_ == DOM_STORAGE_SESSION);
-  DCHECK(!dom_storage_context_->GetStorageNamespace(id, false));
-  DOMStorageNamespace* new_storage_namespace = new DOMStorageNamespace(
-      dom_storage_context_, id, data_dir_path_, dom_storage_type_);
-  // If we haven't used the namespace yet, there's nothing to copy.
-  if (storage_namespace_.get())
-    new_storage_namespace->storage_namespace_.reset(storage_namespace_->copy());
-  return new_storage_namespace;
-}
 
-void DOMStorageNamespace::PurgeMemory() {
-  DCHECK(dom_storage_type_ == DOM_STORAGE_LOCAL);
-  for (OriginToStorageAreaMap::iterator iter(origin_to_storage_area_.begin());
-       iter != origin_to_storage_area_.end(); ++iter)
-    iter->second->PurgeMemory();
-  storage_namespace_.reset();
-}
-
-WebStorageArea* DOMStorageNamespace::CreateWebStorageArea(
-    const string16& origin) {
-  CreateWebStorageNamespaceIfNecessary();
-  return storage_namespace_->createStorageArea(origin);
-}
-
-void DOMStorageNamespace::CreateWebStorageNamespaceIfNecessary() {
-  if (storage_namespace_.get())
-    return;
-
-  if (dom_storage_type_ == DOM_STORAGE_LOCAL) {
-    storage_namespace_.reset(
-        WebStorageNamespace::createLocalStorageNamespace(data_dir_path_,
-            WebStorageNamespace::m_localStorageQuota));
-  } else {
-    storage_namespace_.reset(WebStorageNamespace::createSessionStorageNamespace(
-        WebStorageNamespace::m_sessionStorageQuota));
-  }
-}
+}  // namespace dom_storage