Move webkit/{browser,common}/dom_storage into content/

webkit/browser/dom_storage/dom_storage_namespace.cc

-// 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 "webkit/browser/dom_storage/dom_storage_namespace.h"
-
-#include "base/basictypes.h"
-#include "base/bind.h"
-#include "base/location.h"
-#include "base/logging.h"
-#include "webkit/browser/dom_storage/dom_storage_area.h"
-#include "webkit/browser/dom_storage/dom_storage_task_runner.h"
-#include "webkit/browser/dom_storage/session_storage_database.h"
-#include "webkit/common/dom_storage/dom_storage_types.h"
-
-namespace dom_storage {
-
-DomStorageNamespace::DomStorageNamespace(
-    const base::FilePath& directory,
-    DomStorageTaskRunner* task_runner)
-    : namespace_id_(kLocalStorageNamespaceId),
-      directory_(directory),
-      task_runner_(task_runner) {
-}
-
-DomStorageNamespace::DomStorageNamespace(
-    int64 namespace_id,
-    const std::string& persistent_namespace_id,
-    SessionStorageDatabase* session_storage_database,
-    DomStorageTaskRunner* task_runner)
-    : namespace_id_(namespace_id),
-      persistent_namespace_id_(persistent_namespace_id),
-      task_runner_(task_runner),
-      session_storage_database_(session_storage_database) {
-  DCHECK_NE(kLocalStorageNamespaceId, namespace_id);
-}
-
-DomStorageNamespace::~DomStorageNamespace() {
-}
-
-DomStorageArea* DomStorageNamespace::OpenStorageArea(const GURL& origin) {
-  if (AreaHolder* holder = GetAreaHolder(origin)) {
-    ++(holder->open_count_);
-    return holder->area_.get();
-  }
-  DomStorageArea* area;
-  if (namespace_id_ == kLocalStorageNamespaceId) {
-    area = new DomStorageArea(origin, directory_, task_runner_.get());
-  } else {
-    area = new DomStorageArea(
-        namespace_id_, persistent_namespace_id_, origin,
-        session_storage_database_.get(), task_runner_.get());
-  }
-  areas_[origin] = AreaHolder(area, 1);
-  return area;
-}
-
-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 either, but would be nice.
-}
-
-DomStorageArea* DomStorageNamespace::GetOpenStorageArea(const GURL& origin) {
-  AreaHolder* holder = GetAreaHolder(origin);
-  if (holder && holder->open_count_)
-    return holder->area_.get();
-  return NULL;
-}
-
-DomStorageNamespace* DomStorageNamespace::Clone(
-    int64 clone_namespace_id,
-    const std::string& clone_persistent_namespace_id) {
-  DCHECK_NE(kLocalStorageNamespaceId, namespace_id_);
-  DCHECK_NE(kLocalStorageNamespaceId, clone_namespace_id);
-  DomStorageNamespace* clone = new DomStorageNamespace(
-      clone_namespace_id, clone_persistent_namespace_id,
-      session_storage_database_.get(), task_runner_.get());
-  AreaMap::const_iterator it = areas_.begin();
-  // Clone the in-memory structures.
-  for (; it != areas_.end(); ++it) {
-    DomStorageArea* area = it->second.area_->ShallowCopy(
-        clone_namespace_id, clone_persistent_namespace_id);
-    clone->areas_[it->first] = AreaHolder(area, 0);
-  }
-  // And clone the on-disk structures, too.
-  if (session_storage_database_.get()) {
-    task_runner_->PostShutdownBlockingTask(
-        FROM_HERE,
-        DomStorageTaskRunner::COMMIT_SEQUENCE,
-        base::Bind(base::IgnoreResult(&SessionStorageDatabase::CloneNamespace),
-                   session_storage_database_.get(), persistent_namespace_id_,
-                   clone_persistent_namespace_id));
-  }
-  return clone;
-}
-
-void DomStorageNamespace::DeleteLocalStorageOrigin(const GURL& origin) {
-  DCHECK(!session_storage_database_.get());
-  AreaHolder* holder = GetAreaHolder(origin);
-  if (holder) {
-    holder->area_->DeleteOrigin();
-    return;
-  }
-  if (!directory_.empty()) {
-    scoped_refptr<DomStorageArea> area =
-        new DomStorageArea(origin, directory_, task_runner_.get());
-    area->DeleteOrigin();
-  }
-}
-
-void DomStorageNamespace::DeleteSessionStorageOrigin(const GURL& origin) {
-  DomStorageArea* area = OpenStorageArea(origin);
-  area->FastClear();
-  CloseStorageArea(area);
-}
-
-void DomStorageNamespace::PurgeMemory(PurgeOption option) {
-  if (directory_.empty())
-    return;  // We can't purge w/o backing on disk.
-  AreaMap::iterator it = areas_.begin();
-  while (it != areas_.end()) {
-    // Leave it alone if changes are pending
-    if (it->second.area_->HasUncommittedChanges()) {
-      ++it;
-      continue;
-    }
-
-    // If not in use, we can shut it down and remove
-    // it from our collection entirely.
-    if (it->second.open_count_ == 0) {
-      it->second.area_->Shutdown();
-      areas_.erase(it++);
-      continue;
-    }
-
-    if (option == PURGE_AGGRESSIVE) {
-      // If aggressive is true, we clear caches and such
-      // for opened areas.
-      it->second.area_->PurgeMemory();
-    }
-
-    ++it;
-  }
-}
-
-void DomStorageNamespace::Shutdown() {
-  AreaMap::const_iterator it = areas_.begin();
-  for (; it != areas_.end(); ++it)
-    it->second.area_->Shutdown();
-}
-
-unsigned int DomStorageNamespace::CountInMemoryAreas() const {
-  unsigned int area_count = 0;
-  for (AreaMap::const_iterator it = areas_.begin(); it != areas_.end(); ++it) {
-    if (it->second.area_->IsLoadedInMemory())
-      ++area_count;
-  }
-  return area_count;
-}
-
-DomStorageNamespace::AreaHolder*
-DomStorageNamespace::GetAreaHolder(const GURL& origin) {
-  AreaMap::iterator found = areas_.find(origin);
-  if (found == areas_.end())
-    return NULL;
-  return &(found->second);
-}
-
-// AreaHolder
-
-DomStorageNamespace::AreaHolder::AreaHolder()
-    : open_count_(0) {
-}
-
-DomStorageNamespace::AreaHolder::AreaHolder(
-    DomStorageArea* area, int count)
-    : area_(area), open_count_(count) {
-}
-
-DomStorageNamespace::AreaHolder::~AreaHolder() {
-}
-
-}  // namespace dom_storage