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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "content/browser/indexed_db/indexed_db_transaction_coordinator.h" | |
| 6 | |
| 7 #include "base/basictypes.h" | |
| 8 #include "base/logging.h" | |
| 9 #include "content/browser/indexed_db/indexed_db_transaction.h" | |
| 10 | |
| 11 namespace content { | |
| 12 | |
| 13 IndexedDBTransactionCoordinator::IndexedDBTransactionCoordinator() {} | |
| 14 | |
| 15 IndexedDBTransactionCoordinator::~IndexedDBTransactionCoordinator() { | |
| 16 // TODO(jsbell): DCHECK that all queues are empty. http://crbug.com/241821 | |
| 17 } | |
| 18 | |
| 19 void IndexedDBTransactionCoordinator::DidCreateTransaction( | |
| 20 IndexedDBTransaction* transaction) { | |
| 21 DCHECK(transactions_.find(transaction) == transactions_.end()); | |
| 22 transactions_[transaction] = transaction; | |
| 23 } | |
| 24 | |
| 25 void IndexedDBTransactionCoordinator::DidStartTransaction( | |
| 26 IndexedDBTransaction* transaction) { | |
| 27 DCHECK(transactions_.find(transaction) != transactions_.end()); | |
| 28 | |
| 29 queued_transactions_.insert(transaction); | |
| 30 ProcessStartedTransactions(); | |
| 31 } | |
| 32 | |
| 33 void IndexedDBTransactionCoordinator::DidFinishTransaction( | |
| 34 IndexedDBTransaction* transaction) { | |
| 35 DCHECK(transactions_.find(transaction) != transactions_.end()); | |
| 36 | |
| 37 if (queued_transactions_.has(transaction)) { | |
| 38 DCHECK(started_transactions_.find(transaction) == | |
| 39 started_transactions_.end()); | |
| 40 queued_transactions_.erase(transaction); | |
| 41 } else { | |
| 42 if (started_transactions_.find(transaction) != started_transactions_.end()) | |
| 43 started_transactions_.erase(transaction); | |
| 44 } | |
| 45 transactions_.erase(transaction); | |
| 46 | |
| 47 ProcessStartedTransactions(); | |
| 48 } | |
| 49 | |
| 50 #ifndef NDEBUG | |
| 51 // Verifies internal consistency while returning whether anything is found. | |
| 52 bool IndexedDBTransactionCoordinator::IsActive( | |
| 53 IndexedDBTransaction* transaction) { | |
| 54 bool found = false; | |
| 55 if (queued_transactions_.has(transaction)) | |
| 56 found = true; | |
| 57 if (started_transactions_.find(transaction) != started_transactions_.end()) { | |
| 58 DCHECK(!found); | |
| 59 found = true; | |
| 60 } | |
| 61 DCHECK_EQ(found, (transactions_.find(transaction) != transactions_.end())); | |
| 62 return found; | |
| 63 } | |
| 64 #endif | |
| 65 | |
| 66 void IndexedDBTransactionCoordinator::ProcessStartedTransactions() { | |
| 67 if (queued_transactions_.empty()) | |
| 68 return; | |
| 69 | |
| 70 DCHECK(started_transactions_.empty() || | |
| 71 (*started_transactions_.begin())->mode() != | |
| 72 indexed_db::TRANSACTION_VERSION_CHANGE); | |
| 73 | |
| 74 list_set<IndexedDBTransaction*>::const_iterator it = | |
| 75 queued_transactions_.begin(); | |
| 76 while (it != queued_transactions_.end()) { | |
| 77 IndexedDBTransaction* transaction = *it; | |
| 78 ++it; | |
| 79 if (CanRunTransaction(transaction)) { | |
| 80 queued_transactions_.erase(transaction); | |
| 81 started_transactions_.insert(transaction); | |
| 82 transaction->Run(); | |
| 83 } | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 static bool DoScopesOverlap(const std::set<int64>& scope1, | |
| 88 const std::set<int64>& scope2) { | |
| 89 for (std::set<int64>::const_iterator it = scope1.begin(); it != scope1.end(); | |
| 90 ++it) { | |
| 91 if (scope2.find(*it) != scope2.end()) | |
| 92 return true; | |
| 93 } | |
| 94 return false; | |
| 95 } | |
| 96 | |
| 97 bool IndexedDBTransactionCoordinator::CanRunTransaction( | |
| 98 IndexedDBTransaction* transaction) { | |
| 99 DCHECK(queued_transactions_.has(transaction)); | |
| 100 switch (transaction->mode()) { | |
| 101 case indexed_db::TRANSACTION_VERSION_CHANGE: | |
| 102 DCHECK(queued_transactions_.size() == 1); | |
| 103 DCHECK(started_transactions_.empty()); | |
| 104 return true; | |
| 105 | |
| 106 case indexed_db::TRANSACTION_READ_ONLY: | |
| 107 return true; | |
| 108 | |
| 109 case indexed_db::TRANSACTION_READ_WRITE: | |
| 110 for (std::set<IndexedDBTransaction*>::const_iterator it = | |
| 111 started_transactions_.begin(); | |
| 112 it != started_transactions_.end(); | |
| 113 ++it) { | |
| 114 IndexedDBTransaction* other = *it; | |
| 115 if (other->mode() == indexed_db::TRANSACTION_READ_WRITE && | |
| 116 DoScopesOverlap(transaction->scope(), other->scope())) | |
| 117 return false; | |
| 118 } | |
| 119 for (list_set<IndexedDBTransaction*>::const_iterator it = | |
| 120 queued_transactions_.begin(); | |
| 121 *it != transaction; | |
| 122 ++it) { | |
| 123 DCHECK(it != queued_transactions_.end()); | |
| 124 IndexedDBTransaction* other = *it; | |
| 125 if (other->mode() == indexed_db::TRANSACTION_READ_WRITE && | |
| 126 DoScopesOverlap(transaction->scope(), other->scope())) | |
| 127 return false; | |
| 128 } | |
| 129 return true; | |
| 130 } | |
| 131 NOTREACHED(); | |
| 132 return false; | |
| 133 } | |
| 134 | |
| 135 } // namespace content | |
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Chromium Code Reviews
Issue 15659013:
Revert "Migrate the IndexedDB backend from Blink to Chromium" (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src