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// Copyright 2013 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/dom_storage/dom_storage_namespace.h"
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "content/browser/dom_storage/dom_storage_area.h"
#include "content/browser/dom_storage/dom_storage_task_runner.h"
#include "content/browser/dom_storage/session_storage_database.h"
#include "content/common/dom_storage/dom_storage_types.h"
namespace content {
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()) {
const AreaHolder& holder = it->second;
// We can't purge if there are changes pending.
if (holder.area_->HasUncommittedChanges()) {
if (holder.open_count_ == 0) {
// Schedule an immediate commit so the next time we're asked to purge,
// we can drop it from memory.
holder.area_->ScheduleImmediateCommit();
}
++it;
continue;
}
// If not in use, we can shut it down and remove
// it from our collection entirely.
if (holder.open_count_ == 0) {
holder.area_->Shutdown();
areas_.erase(it++);
continue;
}
if (option == PURGE_AGGRESSIVE) {
// If aggressive is true, we clear caches and such
// for opened areas.
holder.area_->PurgeMemory();
}
++it;
}
}
void DOMStorageNamespace::Shutdown() {
AreaMap::const_iterator it = areas_.begin();
for (; it != areas_.end(); ++it)
it->second.area_->Shutdown();
}
void DOMStorageNamespace::Flush() {
for (auto& entry : areas_) {
if (!entry.second.area_->HasUncommittedChanges())
continue;
entry.second.area_->ScheduleImmediateCommit();
}
}
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 content
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