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