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// 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/dom_storage/dom_storage_area.h"
#include "base/bind.h"
#include "base/time.h"
#include "webkit/dom_storage/dom_storage_map.h"
#include "webkit/dom_storage/dom_storage_namespace.h"
#include "webkit/dom_storage/dom_storage_task_runner.h"
#include "webkit/dom_storage/dom_storage_types.h"
#include "webkit/fileapi/file_system_util.h"
namespace dom_storage {
DomStorageArea::DomStorageArea(
int64 namespace_id, const GURL& origin,
const FilePath& directory, DomStorageTaskRunner* task_runner)
: namespace_id_(namespace_id), origin_(origin),
directory_(directory),
task_runner_(task_runner),
map_(new DomStorageMap(kPerAreaQuota)),
backing_(NULL),
initial_import_done_(false),
clear_all_next_commit_(false),
commit_in_flight_(false) {
if (namespace_id == kLocalStorageNamespaceId && !directory.empty()) {
FilePath path = directory.Append(DatabaseFileNameFromOrigin(origin_));
backing_.reset(new DomStorageDatabase(path));
} else {
// Not a local storage area or no directory specified for backing
// database, (i.e. it's an incognito profile).
initial_import_done_ = true;
}
}
DomStorageArea::~DomStorageArea() {
if (clear_all_next_commit_ || !changed_values_.empty()) {
// Still some data left that was not committed to disk, try now.
// We do this regardless of whether we think a commit is in flight
// as there is no guarantee that that commit will actually get
// processed. For example the task_runner_'s message loop could
// unexpectedly quit before the delayed task is fired and leave the
// commit_in_flight_ flag set. But there's no way for us to determine
// that has happened so force a commit now.
CommitChanges();
// TODO(benm): It's possible that the commit failed, and in
// that case we're going to lose data. Integrate with UMA
// to gather stats about how often this actually happens,
// so that we can figure out a contingency plan.
}
}
unsigned DomStorageArea::Length() {
InitialImportIfNeeded();
return map_->Length();
}
NullableString16 DomStorageArea::Key(unsigned index) {
InitialImportIfNeeded();
return map_->Key(index);
}
NullableString16 DomStorageArea::GetItem(const string16& key) {
InitialImportIfNeeded();
return map_->GetItem(key);
}
bool DomStorageArea::SetItem(const string16& key,
const string16& value,
NullableString16* old_value) {
InitialImportIfNeeded();
if (!map_->HasOneRef())
map_ = map_->DeepCopy();
bool success = map_->SetItem(key, value, old_value);
if (success && backing_.get()) {
changed_values_[key] = NullableString16(value, false);
ScheduleCommitChanges();
}
return success;
}
bool DomStorageArea::RemoveItem(const string16& key, string16* old_value) {
InitialImportIfNeeded();
if (!map_->HasOneRef())
map_ = map_->DeepCopy();
bool success = map_->RemoveItem(key, old_value);
if (success && backing_.get()) {
changed_values_[key] = NullableString16(true);
ScheduleCommitChanges();
}
return success;
}
bool DomStorageArea::Clear() {
InitialImportIfNeeded();
if (map_->Length() == 0)
return false;
map_ = new DomStorageMap(kPerAreaQuota);
if (backing_.get()) {
changed_values_.clear();
clear_all_next_commit_ = true;
ScheduleCommitChanges();
}
return true;
}
DomStorageArea* DomStorageArea::ShallowCopy(int64 destination_namespace_id) {
DCHECK_NE(kLocalStorageNamespaceId, namespace_id_);
DCHECK_NE(kLocalStorageNamespaceId, destination_namespace_id);
// SessionNamespaces aren't backed by files on disk.
DCHECK(!backing_.get());
DomStorageArea* copy = new DomStorageArea(destination_namespace_id, origin_,
FilePath(), task_runner_);
copy->map_ = map_;
return copy;
}
void DomStorageArea::InitialImportIfNeeded() {
if (initial_import_done_)
return;
DCHECK_EQ(kLocalStorageNamespaceId, namespace_id_);
DCHECK(backing_.get());
ValuesMap initial_values;
backing_->ReadAllValues(&initial_values);
map_->SwapValues(&initial_values);
initial_import_done_ = true;
}
void DomStorageArea::ScheduleCommitChanges() {
DCHECK_EQ(kLocalStorageNamespaceId, namespace_id_);
DCHECK(backing_.get());
DCHECK(clear_all_next_commit_ || !changed_values_.empty());
DCHECK(task_runner_.get());
if (commit_in_flight_)
return;
commit_in_flight_ = task_runner_->PostDelayedTask(
FROM_HERE, base::Bind(&DomStorageArea::CommitChanges, this),
base::TimeDelta::FromSeconds(1));
DCHECK(commit_in_flight_);
}
void DomStorageArea::CommitChanges() {
DCHECK(backing_.get());
if (backing_->CommitChanges(clear_all_next_commit_, changed_values_)) {
clear_all_next_commit_ = false;
changed_values_.clear();
}
commit_in_flight_ = false;
}
// static
FilePath DomStorageArea::DatabaseFileNameFromOrigin(const GURL& origin) {
std::string filename = fileapi::GetOriginIdentifierFromURL(origin)
+ ".localstorage";
return FilePath().AppendASCII(filename);
}
} // namespace dom_storage
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