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dom/indexedDB/TransactionThreadPool.h@6474c204b198 (annotated)

dom/indexedDB/TransactionThreadPool.h

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0	1	/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0	2	/* vim: set ts=2 et sw=2 tw=80: */
michael@0	3	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	4	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	5	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	6
michael@0	7	#ifndef mozilla_dom_indexeddb_transactionthreadpool_h__
michael@0	8	#define mozilla_dom_indexeddb_transactionthreadpool_h__
michael@0	9
michael@0	10	// Only meant to be included in IndexedDB source files, not exported.
michael@0	11	#include "IndexedDatabase.h"
michael@0	12
michael@0	13	#include "nsIObserver.h"
michael@0	14	#include "nsIRunnable.h"
michael@0	15
michael@0	16	#include "mozilla/Monitor.h"
michael@0	17	#include "nsClassHashtable.h"
michael@0	18	#include "nsHashKeys.h"
michael@0	19
michael@0	20	#include "IDBTransaction.h"
michael@0	21
michael@0	22	class nsIThreadPool;
michael@0	23
michael@0	24	BEGIN_INDEXEDDB_NAMESPACE
michael@0	25
michael@0	26	class FinishTransactionRunnable;
michael@0	27	class QueuedDispatchInfo;
michael@0	28
michael@0	29	class TransactionThreadPool
michael@0	30	{
michael@0	31	friend class nsAutoPtr<TransactionThreadPool>;
michael@0	32	friend class FinishTransactionRunnable;
michael@0	33
michael@0	34	public:
michael@0	35	// returns a non-owning ref!
michael@0	36	static TransactionThreadPool* GetOrCreate();
michael@0	37
michael@0	38	// returns a non-owning ref!
michael@0	39	static TransactionThreadPool* Get();
michael@0	40
michael@0	41	static void Shutdown();
michael@0	42
michael@0	43	nsresult Dispatch(IDBTransaction* aTransaction,
michael@0	44	nsIRunnable* aRunnable,
michael@0	45	bool aFinish,
michael@0	46	nsIRunnable* aFinishRunnable);
michael@0	47
michael@0	48	void WaitForDatabasesToComplete(nsTArray<nsRefPtr<IDBDatabase> >& aDatabases,
michael@0	49	nsIRunnable* aCallback);
michael@0	50
michael@0	51	// Abort all transactions, unless they are already in the process of being
michael@0	52	// committed, for aDatabase.
michael@0	53	void AbortTransactionsForDatabase(IDBDatabase* aDatabase);
michael@0	54
michael@0	55	// Returns true if there are running or pending transactions for aDatabase.
michael@0	56	bool HasTransactionsForDatabase(IDBDatabase* aDatabase);
michael@0	57
michael@0	58	protected:
michael@0	59	class TransactionQueue MOZ_FINAL : public nsIRunnable
michael@0	60	{
michael@0	61	public:
michael@0	62	NS_DECL_THREADSAFE_ISUPPORTS
michael@0	63	NS_DECL_NSIRUNNABLE
michael@0	64
michael@0	65	TransactionQueue(IDBTransaction* aTransaction);
michael@0	66
michael@0	67	void Unblock();
michael@0	68
michael@0	69	void Dispatch(nsIRunnable* aRunnable);
michael@0	70
michael@0	71	void Finish(nsIRunnable* aFinishRunnable);
michael@0	72
michael@0	73	private:
michael@0	74	mozilla::Monitor mMonitor;
michael@0	75	IDBTransaction* mTransaction;
michael@0	76	nsAutoTArray<nsCOMPtr<nsIRunnable>, 10> mQueue;
michael@0	77	nsCOMPtr<nsIRunnable> mFinishRunnable;
michael@0	78	bool mShouldFinish;
michael@0	79	};
michael@0	80
michael@0	81	friend class TransactionQueue;
michael@0	82
michael@0	83	struct TransactionInfo
michael@0	84	{
michael@0	85	TransactionInfo(IDBTransaction* aTransaction)
michael@0	86	{
michael@0	87	MOZ_COUNT_CTOR(TransactionInfo);
michael@0	88
michael@0	89	transaction = aTransaction;
michael@0	90	queue = new TransactionQueue(aTransaction);
michael@0	91	}
michael@0	92
michael@0	93	~TransactionInfo()
michael@0	94	{
michael@0	95	MOZ_COUNT_DTOR(TransactionInfo);
michael@0	96	}
michael@0	97
michael@0	98	nsRefPtr<IDBTransaction> transaction;
michael@0	99	nsRefPtr<TransactionQueue> queue;
michael@0	100	nsTHashtable<nsPtrHashKey<TransactionInfo> > blockedOn;
michael@0	101	nsTHashtable<nsPtrHashKey<TransactionInfo> > blocking;
michael@0	102	};
michael@0	103
michael@0	104	struct TransactionInfoPair
michael@0	105	{
michael@0	106	TransactionInfoPair()
michael@0	107	: lastBlockingReads(nullptr)
michael@0	108	{
michael@0	109	MOZ_COUNT_CTOR(TransactionInfoPair);
michael@0	110	}
michael@0	111
michael@0	112	~TransactionInfoPair()
michael@0	113	{
michael@0	114	MOZ_COUNT_DTOR(TransactionInfoPair);
michael@0	115	}
michael@0	116	// Multiple reading transactions can block future writes.
michael@0	117	nsTArray<TransactionInfo*> lastBlockingWrites;
michael@0	118	// But only a single writing transaction can block future reads.
michael@0	119	TransactionInfo* lastBlockingReads;
michael@0	120	};
michael@0	121
michael@0	122	struct DatabaseTransactionInfo
michael@0	123	{
michael@0	124	DatabaseTransactionInfo()
michael@0	125	{
michael@0	126	MOZ_COUNT_CTOR(DatabaseTransactionInfo);
michael@0	127	}
michael@0	128
michael@0	129	~DatabaseTransactionInfo()
michael@0	130	{
michael@0	131	MOZ_COUNT_DTOR(DatabaseTransactionInfo);
michael@0	132	}
michael@0	133
michael@0	134	typedef nsClassHashtable<nsPtrHashKey<IDBTransaction>, TransactionInfo >
michael@0	135	TransactionHashtable;
michael@0	136	TransactionHashtable transactions;
michael@0	137	nsClassHashtable<nsStringHashKey, TransactionInfoPair> blockingTransactions;
michael@0	138	};
michael@0	139
michael@0	140	static PLDHashOperator
michael@0	141	CollectTransactions(IDBTransaction* aKey,
michael@0	142	TransactionInfo* aValue,
michael@0	143	void* aUserArg);
michael@0	144
michael@0	145	static PLDHashOperator
michael@0	146	FindTransaction(IDBTransaction* aKey,
michael@0	147	TransactionInfo* aValue,
michael@0	148	void* aUserArg);
michael@0	149
michael@0	150	static PLDHashOperator
michael@0	151	MaybeUnblockTransaction(nsPtrHashKey<TransactionInfo>* aKey,
michael@0	152	void* aUserArg);
michael@0	153
michael@0	154	struct DatabasesCompleteCallback
michael@0	155	{
michael@0	156	nsTArray<nsRefPtr<IDBDatabase> > mDatabases;
michael@0	157	nsCOMPtr<nsIRunnable> mCallback;
michael@0	158	};
michael@0	159
michael@0	160	TransactionThreadPool();
michael@0	161	~TransactionThreadPool();
michael@0	162
michael@0	163	nsresult Init();
michael@0	164	nsresult Cleanup();
michael@0	165
michael@0	166	void FinishTransaction(IDBTransaction* aTransaction);
michael@0	167
michael@0	168	TransactionQueue& GetQueueForTransaction(IDBTransaction* aTransaction);
michael@0	169
michael@0	170	bool MaybeFireCallback(DatabasesCompleteCallback aCallback);
michael@0	171
michael@0	172	nsCOMPtr<nsIThreadPool> mThreadPool;
michael@0	173
michael@0	174	nsClassHashtable<nsCStringHashKey, DatabaseTransactionInfo>
michael@0	175	mTransactionsInProgress;
michael@0	176
michael@0	177	nsTArray<DatabasesCompleteCallback> mCompleteCallbacks;
michael@0	178	};
michael@0	179
michael@0	180	END_INDEXEDDB_NAMESPACE
michael@0	181
michael@0	182	#endif // mozilla_dom_indexeddb_transactionthreadpool_h__