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// Copyright 2014 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 "sync/syncable/deferred_on_disk_directory_backing_store.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/stl_util.h"
#include "sync/syncable/syncable-inl.h"
namespace syncer {
namespace syncable {
DeferredOnDiskDirectoryBackingStore::DeferredOnDiskDirectoryBackingStore(
const std::string& dir_name, const base::FilePath& backing_filepath)
: DirectoryBackingStore(dir_name),
backing_filepath_(backing_filepath),
db_is_on_disk_(false) {
}
DeferredOnDiskDirectoryBackingStore::~DeferredOnDiskDirectoryBackingStore() {}
bool DeferredOnDiskDirectoryBackingStore::SaveChanges(
const Directory::SaveChangesSnapshot& snapshot) {
DCHECK(CalledOnValidThread());
// Back out early if there is nothing to save.
if (snapshot.dirty_metas.empty() && snapshot.metahandles_to_purge.empty() &&
snapshot.delete_journals.empty() &&
snapshot.delete_journals_to_purge.empty()) {
return true;
}
if (!db_is_on_disk_) {
if (!base::DeleteFile(backing_filepath_, false))
return false;
// Reopen DB on disk.
db_.reset(new sql::Connection);
db_->set_exclusive_locking();
db_->set_page_size(4096);
if (!db_->Open(backing_filepath_) || !InitializeTables())
return false;
db_is_on_disk_ = true;
}
return DirectoryBackingStore::SaveChanges(snapshot);
}
DirOpenResult DeferredOnDiskDirectoryBackingStore::Load(
Directory::MetahandlesMap* handles_map,
JournalIndex* delete_journals,
Directory::KernelLoadInfo* kernel_load_info) {
// Open an in-memory database at first to create initial sync data needed by
// Directory.
CHECK(!db_->is_open());
if (!db_->OpenInMemory())
return FAILED_OPEN_DATABASE;
if (!InitializeTables())
return FAILED_OPEN_DATABASE;
if (!LoadEntries(handles_map))
return FAILED_DATABASE_CORRUPT;
if (!LoadInfo(kernel_load_info))
return FAILED_DATABASE_CORRUPT;
return OPENED;
}
} // namespace syncable
} // namespace syncer
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