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1 /* | 1 /* |
2 * Copyright (C) 2013 Apple Inc. All rights reserved. | 2 * Copyright (C) 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 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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41 | 41 |
42 typedef SQLTransactionState (T::* StateFunction)(); | 42 typedef SQLTransactionState (T::* StateFunction)(); |
43 virtual StateFunction stateFunctionFor(SQLTransactionState) = 0; | 43 virtual StateFunction stateFunctionFor(SQLTransactionState) = 0; |
44 | 44 |
45 void setStateToRequestedState(); | 45 void setStateToRequestedState(); |
46 void runStateMachine(); | 46 void runStateMachine(); |
47 | 47 |
48 SQLTransactionState m_nextState; | 48 SQLTransactionState m_nextState; |
49 SQLTransactionState m_requestedState; | 49 SQLTransactionState m_requestedState; |
50 | 50 |
51 #ifndef NDEBUG | 51 #if ENABLE(ASSERT) |
52 // The state audit trail (i.e. bread crumbs) keeps track of up to the last | 52 // The state audit trail (i.e. bread crumbs) keeps track of up to the last |
53 // s_sizeOfStateAuditTrail states that the state machine enters. The audit | 53 // s_sizeOfStateAuditTrail states that the state machine enters. The audit |
54 // trail is updated before entering each state. This is for debugging use | 54 // trail is updated before entering each state. This is for debugging use |
55 // only. | 55 // only. |
56 static const int s_sizeOfStateAuditTrail = 20; | 56 static const int s_sizeOfStateAuditTrail = 20; |
57 int m_nextStateAuditEntry; | 57 int m_nextStateAuditEntry; |
58 SQLTransactionState m_stateAuditTrail[s_sizeOfStateAuditTrail]; | 58 SQLTransactionState m_stateAuditTrail[s_sizeOfStateAuditTrail]; |
59 #endif | 59 #endif |
60 }; | 60 }; |
61 | 61 |
62 #if !LOG_DISABLED | 62 #if !LOG_DISABLED |
63 extern const char* nameForSQLTransactionState(SQLTransactionState); | 63 extern const char* nameForSQLTransactionState(SQLTransactionState); |
64 #endif | 64 #endif |
65 | 65 |
66 template<typename T> | 66 template<typename T> |
67 SQLTransactionStateMachine<T>::SQLTransactionStateMachine() | 67 SQLTransactionStateMachine<T>::SQLTransactionStateMachine() |
68 : m_nextState(SQLTransactionState::Idle) | 68 : m_nextState(SQLTransactionState::Idle) |
69 , m_requestedState(SQLTransactionState::Idle) | 69 , m_requestedState(SQLTransactionState::Idle) |
70 #ifndef NDEBUG | 70 #if ENABLE(ASSERT) |
71 , m_nextStateAuditEntry(0) | 71 , m_nextStateAuditEntry(0) |
72 #endif | 72 #endif |
73 { | 73 { |
74 #ifndef NDEBUG | 74 #if ENABLE(ASSERT) |
75 for (int i = 0; i < s_sizeOfStateAuditTrail; i++) | 75 for (int i = 0; i < s_sizeOfStateAuditTrail; i++) |
76 m_stateAuditTrail[i] = SQLTransactionState::NumberOfStates; | 76 m_stateAuditTrail[i] = SQLTransactionState::NumberOfStates; |
77 #endif | 77 #endif |
78 } | 78 } |
79 | 79 |
80 template<typename T> | 80 template<typename T> |
81 void SQLTransactionStateMachine<T>::setStateToRequestedState() | 81 void SQLTransactionStateMachine<T>::setStateToRequestedState() |
82 { | 82 { |
83 ASSERT(m_nextState == SQLTransactionState::Idle); | 83 ASSERT(m_nextState == SQLTransactionState::Idle); |
84 ASSERT(m_requestedState != SQLTransactionState::Idle); | 84 ASSERT(m_requestedState != SQLTransactionState::Idle); |
85 m_nextState = m_requestedState; | 85 m_nextState = m_requestedState; |
86 m_requestedState = SQLTransactionState::Idle; | 86 m_requestedState = SQLTransactionState::Idle; |
87 } | 87 } |
88 | 88 |
89 template<typename T> | 89 template<typename T> |
90 void SQLTransactionStateMachine<T>::runStateMachine() | 90 void SQLTransactionStateMachine<T>::runStateMachine() |
91 { | 91 { |
92 ASSERT(SQLTransactionState::End < SQLTransactionState::Idle); | 92 ASSERT(SQLTransactionState::End < SQLTransactionState::Idle); |
93 while (m_nextState > SQLTransactionState::Idle) { | 93 while (m_nextState > SQLTransactionState::Idle) { |
94 ASSERT(m_nextState < SQLTransactionState::NumberOfStates); | 94 ASSERT(m_nextState < SQLTransactionState::NumberOfStates); |
95 StateFunction stateFunction = stateFunctionFor(m_nextState); | 95 StateFunction stateFunction = stateFunctionFor(m_nextState); |
96 ASSERT(stateFunction); | 96 ASSERT(stateFunction); |
97 | 97 |
98 #ifndef NDEBUG | 98 #if ENABLE(ASSERT) |
99 m_stateAuditTrail[m_nextStateAuditEntry] = m_nextState; | 99 m_stateAuditTrail[m_nextStateAuditEntry] = m_nextState; |
100 m_nextStateAuditEntry = (m_nextStateAuditEntry + 1) % s_sizeOfStateAudit
Trail; | 100 m_nextStateAuditEntry = (m_nextStateAuditEntry + 1) % s_sizeOfStateAudit
Trail; |
101 #endif | 101 #endif |
102 m_nextState = (static_cast<T*>(this)->*stateFunction)(); | 102 m_nextState = (static_cast<T*>(this)->*stateFunction)(); |
103 } | 103 } |
104 } | 104 } |
105 | 105 |
106 } // namespace WebCore | 106 } // namespace WebCore |
107 | 107 |
108 #endif // SQLTransactionStateMachine_h | 108 #endif // SQLTransactionStateMachine_h |
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