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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "content/renderer/dom_storage/webstoragearea_impl.h"
      6 
      7 #include "base/lazy_instance.h"
      8 #include "base/metrics/histogram.h"
      9 #include "base/strings/utf_string_conversions.h"
     10 #include "base/time/time.h"
     11 #include "content/common/dom_storage/dom_storage_messages.h"
     12 #include "content/renderer/dom_storage/dom_storage_cached_area.h"
     13 #include "content/renderer/dom_storage/dom_storage_dispatcher.h"
     14 #include "content/renderer/render_thread_impl.h"
     15 #include "third_party/WebKit/public/platform/WebURL.h"
     16 
     17 using blink::WebString;
     18 using blink::WebURL;
     19 
     20 namespace content {
     21 
     22 namespace {
     23 typedef IDMap<WebStorageAreaImpl> AreaImplMap;
     24 base::LazyInstance<AreaImplMap>::Leaky
     25     g_all_areas_map = LAZY_INSTANCE_INITIALIZER;
     26 
     27 DomStorageDispatcher* dispatcher() {
     28   return RenderThreadImpl::current()->dom_storage_dispatcher();
     29 }
     30 }  // namespace
     31 
     32 // static
     33 WebStorageAreaImpl* WebStorageAreaImpl::FromConnectionId(int id) {
     34   return g_all_areas_map.Pointer()->Lookup(id);
     35 }
     36 
     37 WebStorageAreaImpl::WebStorageAreaImpl(
     38     int64 namespace_id, const GURL& origin)
     39     : connection_id_(g_all_areas_map.Pointer()->Add(this)),
     40       cached_area_(dispatcher()->
     41           OpenCachedArea(connection_id_, namespace_id, origin)) {
     42 }
     43 
     44 WebStorageAreaImpl::~WebStorageAreaImpl() {
     45   g_all_areas_map.Pointer()->Remove(connection_id_);
     46   if (dispatcher())
     47     dispatcher()->CloseCachedArea(connection_id_, cached_area_.get());
     48 }
     49 
     50 unsigned WebStorageAreaImpl::length() {
     51   return cached_area_->GetLength(connection_id_);
     52 }
     53 
     54 WebString WebStorageAreaImpl::key(unsigned index) {
     55   return cached_area_->GetKey(connection_id_, index);
     56 }
     57 
     58 WebString WebStorageAreaImpl::getItem(const WebString& key) {
     59   return cached_area_->GetItem(connection_id_, key);
     60 }
     61 
     62 void WebStorageAreaImpl::setItem(
     63     const WebString& key, const WebString& value, const WebURL& page_url,
     64     WebStorageArea::Result& result) {
     65   if (!cached_area_->SetItem(connection_id_, key, value, page_url))
     66     result = ResultBlockedByQuota;
     67   else
     68     result = ResultOK;
     69 }
     70 
     71 void WebStorageAreaImpl::removeItem(
     72     const WebString& key, const WebURL& page_url) {
     73   cached_area_->RemoveItem(connection_id_, key, page_url);
     74 }
     75 
     76 void WebStorageAreaImpl::clear(const WebURL& page_url) {
     77   cached_area_->Clear(connection_id_, page_url);
     78 }
     79 
     80 size_t WebStorageAreaImpl::memoryBytesUsedByCache() const {
     81   return cached_area_->MemoryBytesUsedByCache();
     82 }
     83 
     84 }  // namespace content
     85