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| 1 /* | 1 /* |
| 2 * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved. | 2 * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved. |
| 3 * | 3 * |
| 4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
| 6 * are met: | 6 * are met: |
| 7 * | 7 * |
| 8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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| 224 // state (indicated by m_nextState), and then transits itself to the Idle state | 224 // state (indicated by m_nextState), and then transits itself to the Idle state |
| 225 // to wait for further action. | 225 // to wait for further action. |
| 226 | 226 |
| 227 | 227 |
| 228 // The Life-Cycle of a SQLTransaction i.e. Who's keeping the SQLTransaction aliv
e? | 228 // The Life-Cycle of a SQLTransaction i.e. Who's keeping the SQLTransaction aliv
e? |
| 229 // =============================================================================
= | 229 // =============================================================================
= |
| 230 // The RefPtr chain goes something like this: | 230 // The RefPtr chain goes something like this: |
| 231 // | 231 // |
| 232 // At birth (in Database::runTransaction()): | 232 // At birth (in Database::runTransaction()): |
| 233 // ==================================================== | 233 // ==================================================== |
| 234 // Database // HeapDeque<Member<SQLTransactionBack
end> > m_transactionQueue points to ... | 234 // Database // HeapDeque<Member<SQLTransactionBack
end>> m_transactionQueue points to ... |
| 235 // --> SQLTransactionBackend // Member<SQLTransaction> m_frontend p
oints to ... | 235 // --> SQLTransactionBackend // Member<SQLTransaction> m_frontend p
oints to ... |
| 236 // --> SQLTransaction // Member<SQLTransactionBackend> m_bac
kend points to ... | 236 // --> SQLTransaction // Member<SQLTransactionBackend> m_bac
kend points to ... |
| 237 // --> SQLTransactionBackend // which is a circular reference. | 237 // --> SQLTransactionBackend // which is a circular reference. |
| 238 // | 238 // |
| 239 // Note: there's a circular reference between the SQLTransaction front-end a
nd | 239 // Note: there's a circular reference between the SQLTransaction front-end a
nd |
| 240 // back-end. This circular reference is established in the constructor of th
e | 240 // back-end. This circular reference is established in the constructor of th
e |
| 241 // SQLTransactionBackend. The circular reference will be broken by calling | 241 // SQLTransactionBackend. The circular reference will be broken by calling |
| 242 // doCleanup() to nullify m_frontend. This is done at the end of the transac
tion's | 242 // doCleanup() to nullify m_frontend. This is done at the end of the transac
tion's |
| 243 // clean up state (i.e. when the transaction should no longer be in use ther
eafter), | 243 // clean up state (i.e. when the transaction should no longer be in use ther
eafter), |
| 244 // or if the database was interrupted. See comments on "What happens if a tr
ansaction | 244 // or if the database was interrupted. See comments on "What happens if a tr
ansaction |
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| 819 } | 819 } |
| 820 | 820 |
| 821 SQLTransactionState SQLTransactionBackend::sendToFrontendState() | 821 SQLTransactionState SQLTransactionBackend::sendToFrontendState() |
| 822 { | 822 { |
| 823 ASSERT(m_nextState != SQLTransactionState::Idle); | 823 ASSERT(m_nextState != SQLTransactionState::Idle); |
| 824 m_frontend->requestTransitToState(m_nextState); | 824 m_frontend->requestTransitToState(m_nextState); |
| 825 return SQLTransactionState::Idle; | 825 return SQLTransactionState::Idle; |
| 826 } | 826 } |
| 827 | 827 |
| 828 } // namespace blink | 828 } // namespace blink |
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