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// Copyright (c) 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.
#ifndef CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_H_
#define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_H_
#include <queue>
#include <set>
#include <stack>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "content/browser/indexed_db/indexed_db_backing_store.h"
#include "content/browser/indexed_db/indexed_db_database.h"
#include "content/browser/indexed_db/indexed_db_database_error.h"
namespace content {
class IndexedDBCursor;
class IndexedDBDatabaseCallbacks;
class CONTENT_EXPORT IndexedDBTransaction
: public NON_EXPORTED_BASE(base::RefCounted<IndexedDBTransaction>) {
public:
typedef base::Callback<void(IndexedDBTransaction*)> Operation;
IndexedDBTransaction(
int64 id,
scoped_refptr<IndexedDBDatabaseCallbacks> callbacks,
const std::set<int64>& object_store_ids,
indexed_db::TransactionMode,
IndexedDBDatabase* db,
IndexedDBBackingStore::Transaction* backing_store_transaction);
virtual void Abort();
void Commit();
void Abort(const IndexedDBDatabaseError& error);
// Called by the transaction coordinator when this transaction is unblocked.
void Start();
indexed_db::TransactionMode mode() const { return mode_; }
const std::set<int64>& scope() const { return object_store_ids_; }
void ScheduleTask(Operation task) {
ScheduleTask(IndexedDBDatabase::NORMAL_TASK, task);
}
void ScheduleTask(Operation task, Operation abort_task);
void ScheduleTask(IndexedDBDatabase::TaskType, Operation task);
void RegisterOpenCursor(IndexedDBCursor* cursor);
void UnregisterOpenCursor(IndexedDBCursor* cursor);
void AddPreemptiveEvent() { pending_preemptive_events_++; }
void DidCompletePreemptiveEvent() {
pending_preemptive_events_--;
DCHECK_GE(pending_preemptive_events_, 0);
}
IndexedDBBackingStore::Transaction* BackingStoreTransaction() {
return transaction_.get();
}
int64 id() const { return id_; }
IndexedDBDatabase* database() const { return database_; }
IndexedDBDatabaseCallbacks* connection() const { return callbacks_; }
enum State {
CREATED, // Created, but not yet started by coordinator.
STARTED, // Started by the coordinator.
FINISHED, // Either aborted or committed.
};
State state() const { return state_; }
bool IsTimeoutTimerRunning() const { return timeout_timer_.IsRunning(); }
struct Diagnostics {
base::Time creation_time;
base::Time start_time;
int tasks_scheduled;
int tasks_completed;
};
const Diagnostics& diagnostics() const { return diagnostics_; }
private:
FRIEND_TEST_ALL_PREFIXES(IndexedDBTransactionTestMode, AbortPreemptive);
FRIEND_TEST_ALL_PREFIXES(IndexedDBTransactionTest, Timeout);
FRIEND_TEST_ALL_PREFIXES(IndexedDBTransactionTest,
SchedulePreemptiveTask);
FRIEND_TEST_ALL_PREFIXES(IndexedDBTransactionTestMode,
ScheduleNormalTask);
friend class base::RefCounted<IndexedDBTransaction>;
virtual ~IndexedDBTransaction();
void RunTasksIfStarted();
bool IsTaskQueueEmpty() const;
bool HasPendingTasks() const;
void ProcessTaskQueue();
void CloseOpenCursors();
void Timeout();
const int64 id_;
const std::set<int64> object_store_ids_;
const indexed_db::TransactionMode mode_;
bool used_;
State state_;
bool commit_pending_;
scoped_refptr<IndexedDBDatabaseCallbacks> callbacks_;
scoped_refptr<IndexedDBDatabase> database_;
class TaskQueue {
public:
TaskQueue();
~TaskQueue();
bool empty() const { return queue_.empty(); }
void push(Operation task) { queue_.push(task); }
Operation pop();
void clear();
private:
std::queue<Operation> queue_;
};
class TaskStack {
public:
TaskStack();
~TaskStack();
bool empty() const { return stack_.empty(); }
void push(Operation task) { stack_.push(task); }
Operation pop();
void clear();
private:
std::stack<Operation> stack_;
};
TaskQueue task_queue_;
TaskQueue preemptive_task_queue_;
TaskStack abort_task_stack_;
scoped_ptr<IndexedDBBackingStore::Transaction> transaction_;
bool backing_store_transaction_begun_;
bool should_process_queue_;
int pending_preemptive_events_;
std::set<IndexedDBCursor*> open_cursors_;
// This timer is started after requests have been processed. If no subsequent
// requests are processed before the timer fires, assume the script is
// unresponsive and abort to unblock the transaction queue.
base::OneShotTimer<IndexedDBTransaction> timeout_timer_;
Diagnostics diagnostics_;
};
} // namespace content
#endif // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TRANSACTION_H_
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