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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 "storage/common/database/database_connections.h"
#include "base/auto_reset.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/thread_task_runner_handle.h"
namespace storage {
DatabaseConnections::DatabaseConnections() {
}
DatabaseConnections::~DatabaseConnections() {
DCHECK(connections_.empty());
}
bool DatabaseConnections::IsEmpty() const {
return connections_.empty();
}
bool DatabaseConnections::IsDatabaseOpened(
const std::string& origin_identifier,
const base::string16& database_name) const {
OriginConnections::const_iterator origin_it =
connections_.find(origin_identifier);
if (origin_it == connections_.end())
return false;
const DBConnections& origin_connections = origin_it->second;
return (origin_connections.find(database_name) != origin_connections.end());
}
bool DatabaseConnections::IsOriginUsed(
const std::string& origin_identifier) const {
return (connections_.find(origin_identifier) != connections_.end());
}
bool DatabaseConnections::AddConnection(
const std::string& origin_identifier,
const base::string16& database_name) {
int& count = connections_[origin_identifier][database_name].first;
return ++count == 1;
}
bool DatabaseConnections::RemoveConnection(
const std::string& origin_identifier,
const base::string16& database_name) {
return RemoveConnectionsHelper(origin_identifier, database_name, 1);
}
void DatabaseConnections::RemoveAllConnections() {
connections_.clear();
}
void DatabaseConnections::RemoveConnections(
const DatabaseConnections& connections,
std::vector<std::pair<std::string, base::string16> >* closed_dbs) {
for (OriginConnections::const_iterator origin_it =
connections.connections_.begin();
origin_it != connections.connections_.end();
origin_it++) {
const DBConnections& db_connections = origin_it->second;
for (DBConnections::const_iterator db_it = db_connections.begin();
db_it != db_connections.end(); db_it++) {
if (RemoveConnectionsHelper(origin_it->first, db_it->first,
db_it->second.first))
closed_dbs->push_back(std::make_pair(origin_it->first, db_it->first));
}
}
}
int64 DatabaseConnections::GetOpenDatabaseSize(
const std::string& origin_identifier,
const base::string16& database_name) const {
DCHECK(IsDatabaseOpened(origin_identifier, database_name));
return connections_[origin_identifier][database_name].second;
}
void DatabaseConnections::SetOpenDatabaseSize(
const std::string& origin_identifier,
const base::string16& database_name,
int64 size) {
DCHECK(IsDatabaseOpened(origin_identifier, database_name));
connections_[origin_identifier][database_name].second = size;
}
void DatabaseConnections::ListConnections(
std::vector<std::pair<std::string, base::string16> > *list) const {
for (OriginConnections::const_iterator origin_it =
connections_.begin();
origin_it != connections_.end();
origin_it++) {
const DBConnections& db_connections = origin_it->second;
for (DBConnections::const_iterator db_it = db_connections.begin();
db_it != db_connections.end(); db_it++) {
list->push_back(std::make_pair(origin_it->first, db_it->first));
}
}
}
bool DatabaseConnections::RemoveConnectionsHelper(
const std::string& origin_identifier,
const base::string16& database_name,
int num_connections) {
OriginConnections::iterator origin_iterator =
connections_.find(origin_identifier);
DCHECK(origin_iterator != connections_.end());
DBConnections& db_connections = origin_iterator->second;
int& count = db_connections[database_name].first;
DCHECK(count >= num_connections);
count -= num_connections;
if (count)
return false;
db_connections.erase(database_name);
if (db_connections.empty())
connections_.erase(origin_iterator);
return true;
}
DatabaseConnectionsWrapper::DatabaseConnectionsWrapper()
: waiting_for_dbs_to_close_(false),
main_thread_(base::ThreadTaskRunnerHandle::Get()) {
}
DatabaseConnectionsWrapper::~DatabaseConnectionsWrapper() {
}
void DatabaseConnectionsWrapper::WaitForAllDatabasesToClose() {
// We assume that new databases won't be open while we're waiting.
DCHECK(main_thread_->BelongsToCurrentThread());
if (HasOpenConnections()) {
base::AutoReset<bool> auto_reset(&waiting_for_dbs_to_close_, true);
base::MessageLoop::ScopedNestableTaskAllower allow(
base::MessageLoop::current());
base::MessageLoop::current()->Run();
}
}
bool DatabaseConnectionsWrapper::HasOpenConnections() {
DCHECK(main_thread_->BelongsToCurrentThread());
base::AutoLock auto_lock(open_connections_lock_);
return !open_connections_.IsEmpty();
}
void DatabaseConnectionsWrapper::AddOpenConnection(
const std::string& origin_identifier,
const base::string16& database_name) {
// We add to the collection immediately on any thread.
base::AutoLock auto_lock(open_connections_lock_);
open_connections_.AddConnection(origin_identifier, database_name);
}
void DatabaseConnectionsWrapper::RemoveOpenConnection(
const std::string& origin_identifier,
const base::string16& database_name) {
// But only remove from the collection on the main thread
// so we can handle the waiting_for_dbs_to_close_ case.
if (!main_thread_->BelongsToCurrentThread()) {
main_thread_->PostTask(
FROM_HERE,
base::Bind(&DatabaseConnectionsWrapper::RemoveOpenConnection, this,
origin_identifier, database_name));
return;
}
base::AutoLock auto_lock(open_connections_lock_);
open_connections_.RemoveConnection(origin_identifier, database_name);
if (waiting_for_dbs_to_close_ && open_connections_.IsEmpty())
base::MessageLoop::current()->Quit();
}
} // namespace storage
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