gecko/dom/indexedDB/TransactionThreadPool.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Indexed Database.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Ben Turner <bent.mozilla@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef mozilla_dom_indexeddb_transactionthreadpool_h__
#define mozilla_dom_indexeddb_transactionthreadpool_h__
// Only meant to be included in IndexedDB source files, not exported.
#include "IndexedDatabase.h"
#include "nsIObserver.h"
#include "nsIRunnable.h"
#include "mozilla/Mutex.h"
#include "mozilla/CondVar.h"
#include "nsClassHashtable.h"
#include "nsHashKeys.h"
#include "nsRefPtrHashtable.h"
#include "IDBTransaction.h"
class nsIThreadPool;
BEGIN_INDEXEDDB_NAMESPACE
class FinishTransactionRunnable;
class QueuedDispatchInfo;
class TransactionThreadPool
{
friend class nsAutoPtr<TransactionThreadPool>;
friend class FinishTransactionRunnable;
public:
// returns a non-owning ref!
static TransactionThreadPool* GetOrCreate();
// returns a non-owning ref!
static TransactionThreadPool* Get();
static void Shutdown();
nsresult Dispatch(IDBTransaction* aTransaction,
nsIRunnable* aRunnable,
bool aFinish,
nsIRunnable* aFinishRunnable);
bool WaitForAllDatabasesToComplete(
nsTArray<nsRefPtr<IDBDatabase> >& aDatabases,
nsIRunnable* aCallback);
// Abort all transactions, unless they are already in the process of being
// committed, for aDatabase.
void AbortTransactionsForDatabase(IDBDatabase* aDatabase);
// Returns true iff there are running or pending transactions for aDatabase.
bool HasTransactionsForDatabase(IDBDatabase* aDatabase);
protected:
class TransactionQueue : public nsIRunnable
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
inline TransactionQueue(IDBTransaction* aTransaction,
nsIRunnable* aRunnable);
inline void Dispatch(nsIRunnable* aRunnable);
inline void Finish(nsIRunnable* aFinishRunnable);
private:
mozilla::Mutex mMutex;
mozilla::CondVar mCondVar;
IDBTransaction* mTransaction;
nsAutoTArray<nsCOMPtr<nsIRunnable>, 10> mQueue;
nsCOMPtr<nsIRunnable> mFinishRunnable;
bool mShouldFinish;
};
struct TransactionInfo
{
nsRefPtr<IDBTransaction> transaction;
nsRefPtr<TransactionQueue> queue;
nsTArray<nsString> objectStoreNames;
};
struct DatabaseTransactionInfo
{
DatabaseTransactionInfo()
: locked(false), lockPending(false)
{ }
bool locked;
bool lockPending;
nsTArray<TransactionInfo> transactions;
nsTArray<nsString> storesReading;
nsTArray<nsString> storesWriting;
};
struct QueuedDispatchInfo
{
QueuedDispatchInfo()
: finish(false)
{ }
nsRefPtr<IDBTransaction> transaction;
nsCOMPtr<nsIRunnable> runnable;
nsCOMPtr<nsIRunnable> finishRunnable;
bool finish;
};
struct DatabasesCompleteCallback
{
nsTArray<nsRefPtr<IDBDatabase> > mDatabases;
nsCOMPtr<nsIRunnable> mCallback;
};
TransactionThreadPool();
~TransactionThreadPool();
nsresult Init();
nsresult Cleanup();
void FinishTransaction(IDBTransaction* aTransaction);
nsresult TransactionCanRun(IDBTransaction* aTransaction,
bool* aCanRun,
TransactionQueue** aExistingQueue);
nsresult Dispatch(const QueuedDispatchInfo& aInfo)
{
return Dispatch(aInfo.transaction, aInfo.runnable, aInfo.finish,
aInfo.finishRunnable);
}
void MaybeFireCallback(PRUint32 aCallbackIndex);
nsCOMPtr<nsIThreadPool> mThreadPool;
nsClassHashtable<nsUint32HashKey, DatabaseTransactionInfo>
mTransactionsInProgress;
nsTArray<QueuedDispatchInfo> mDelayedDispatchQueue;
nsTArray<DatabasesCompleteCallback> mCompleteCallbacks;
};
END_INDEXEDDB_NAMESPACE
#endif // mozilla_dom_indexeddb_transactionthreadpool_h__