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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: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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/Monitor.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<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 if there are running or pending transactions for aDatabase.
bool HasTransactionsForDatabase(IDBDatabase* aDatabase);
protected:
class TransactionQueue MOZ_FINAL : public nsIRunnable
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
TransactionQueue(IDBTransaction* aTransaction);
void Unblock();
void Dispatch(nsIRunnable* aRunnable);
void Finish(nsIRunnable* aFinishRunnable);
private:
mozilla::Monitor mMonitor;
IDBTransaction* mTransaction;
nsAutoTArray<nsCOMPtr<nsIRunnable>, 10> mQueue;
nsCOMPtr<nsIRunnable> mFinishRunnable;
bool mShouldFinish;
};
friend class TransactionQueue;
struct TransactionInfo
{
TransactionInfo(IDBTransaction* aTransaction,
const nsTArray<nsString>& aObjectStoreNames)
{
MOZ_COUNT_CTOR(TransactionInfo);
blockedOn.Init();
blocking.Init();
transaction = aTransaction;
queue = new TransactionQueue(aTransaction);
objectStoreNames.AppendElements(aObjectStoreNames);
}
~TransactionInfo()
{
MOZ_COUNT_DTOR(TransactionInfo);
}
nsRefPtr<IDBTransaction> transaction;
nsRefPtr<TransactionQueue> queue;
nsTArray<nsString> objectStoreNames;
nsTHashtable<nsPtrHashKey<TransactionInfo> > blockedOn;
nsTHashtable<nsPtrHashKey<TransactionInfo> > blocking;
};
struct TransactionInfoPair
{
TransactionInfoPair()
: lastBlockingReads(nullptr)
{
MOZ_COUNT_CTOR(TransactionInfoPair);
}
~TransactionInfoPair()
{
MOZ_COUNT_DTOR(TransactionInfoPair);
}
// Multiple reading transactions can block future writes.
nsTArray<TransactionInfo*> lastBlockingWrites;
// But only a single writing transaction can block future reads.
TransactionInfo* lastBlockingReads;
};
struct DatabaseTransactionInfo
{
DatabaseTransactionInfo()
{
MOZ_COUNT_CTOR(DatabaseTransactionInfo);
transactions.Init();
blockingTransactions.Init();
}
~DatabaseTransactionInfo()
{
MOZ_COUNT_DTOR(DatabaseTransactionInfo);
}
typedef nsClassHashtable<nsPtrHashKey<IDBTransaction>, TransactionInfo >
TransactionHashtable;
TransactionHashtable transactions;
nsClassHashtable<nsStringHashKey, TransactionInfoPair> blockingTransactions;
};
static PLDHashOperator
CollectTransactions(IDBTransaction* aKey,
TransactionInfo* aValue,
void* aUserArg);
static PLDHashOperator
FindTransaction(IDBTransaction* aKey,
TransactionInfo* aValue,
void* aUserArg);
static PLDHashOperator
MaybeUnblockTransaction(nsPtrHashKey<TransactionInfo>* aKey,
void* aUserArg);
struct DatabasesCompleteCallback
{
nsTArray<IDBDatabase*> mDatabases;
nsCOMPtr<nsIRunnable> mCallback;
};
TransactionThreadPool();
~TransactionThreadPool();
nsresult Init();
nsresult Cleanup();
void FinishTransaction(IDBTransaction* aTransaction);
TransactionQueue& GetQueueForTransaction(IDBTransaction* aTransaction);
bool MaybeFireCallback(DatabasesCompleteCallback& aCallback);
nsCOMPtr<nsIThreadPool> mThreadPool;
nsClassHashtable<nsISupportsHashKey, DatabaseTransactionInfo>
mTransactionsInProgress;
nsTArray<DatabasesCompleteCallback> mCompleteCallbacks;
};
END_INDEXEDDB_NAMESPACE
#endif // mozilla_dom_indexeddb_transactionthreadpool_h__
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