1926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)/* 2926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * Copyright (C) 2013 Apple Inc. All rights reserved. 3926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * 4926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * Redistribution and use in source and binary forms, with or without 5926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * modification, are permitted provided that the following conditions 6926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * are met: 7926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * 1. Redistributions of source code must retain the above copyright 8926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * notice, this list of conditions and the following disclaimer. 9926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * 2. Redistributions in binary form must reproduce the above copyright 10926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * notice, this list of conditions and the following disclaimer in the 11926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * documentation and/or other materials provided with the distribution. 12926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * 13926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2302772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) */ 25926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 26926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)#ifndef SQLTransactionStateMachine_h 27926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)#define SQLTransactionStateMachine_h 28926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 2953e740f4a82e17f3ae59772501622dc354e42336Torne (Richard Coles)#include "modules/webdatabase/SQLTransactionState.h" 3053e740f4a82e17f3ae59772501622dc354e42336Torne (Richard Coles)#include "wtf/ThreadSafeRefCounted.h" 31926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 32c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)namespace blink { 33926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 34926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)template<typename T> 35926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)class SQLTransactionStateMachine { 36926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)public: 37926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) virtual ~SQLTransactionStateMachine() { } 38926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 39926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)protected: 40926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) SQLTransactionStateMachine(); 41926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 42926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) typedef SQLTransactionState (T::* StateFunction)(); 43926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) virtual StateFunction stateFunctionFor(SQLTransactionState) = 0; 44926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 45926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) void setStateToRequestedState(); 46926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) void runStateMachine(); 47926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 48926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) SQLTransactionState m_nextState; 49926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) SQLTransactionState m_requestedState; 50926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 51197021e6b966cfb06891637935ef33fff06433d1Ben Murdoch#if ENABLE(ASSERT) 52926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) // The state audit trail (i.e. bread crumbs) keeps track of up to the last 53926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) // s_sizeOfStateAuditTrail states that the state machine enters. The audit 54926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) // trail is updated before entering each state. This is for debugging use 55926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) // only. 56926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) static const int s_sizeOfStateAuditTrail = 20; 57926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) int m_nextStateAuditEntry; 58926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) SQLTransactionState m_stateAuditTrail[s_sizeOfStateAuditTrail]; 59926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)#endif 60926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)}; 61926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 62926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)#if !LOG_DISABLED 63926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)extern const char* nameForSQLTransactionState(SQLTransactionState); 64926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)#endif 65926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 66926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)template<typename T> 67926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)SQLTransactionStateMachine<T>::SQLTransactionStateMachine() 68926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) : m_nextState(SQLTransactionState::Idle) 69926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) , m_requestedState(SQLTransactionState::Idle) 70197021e6b966cfb06891637935ef33fff06433d1Ben Murdoch#if ENABLE(ASSERT) 71926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) , m_nextStateAuditEntry(0) 72926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)#endif 73926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles){ 74197021e6b966cfb06891637935ef33fff06433d1Ben Murdoch#if ENABLE(ASSERT) 75926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) for (int i = 0; i < s_sizeOfStateAuditTrail; i++) 76926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) m_stateAuditTrail[i] = SQLTransactionState::NumberOfStates; 77926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)#endif 78926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)} 79926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 80926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)template<typename T> 81926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)void SQLTransactionStateMachine<T>::setStateToRequestedState() 82926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles){ 83926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) ASSERT(m_nextState == SQLTransactionState::Idle); 84926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) ASSERT(m_requestedState != SQLTransactionState::Idle); 85926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) m_nextState = m_requestedState; 86926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) m_requestedState = SQLTransactionState::Idle; 87926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)} 88926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 89926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)template<typename T> 90926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)void SQLTransactionStateMachine<T>::runStateMachine() 91926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles){ 92926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) ASSERT(SQLTransactionState::End < SQLTransactionState::Idle); 93926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) while (m_nextState > SQLTransactionState::Idle) { 94926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) ASSERT(m_nextState < SQLTransactionState::NumberOfStates); 95926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) StateFunction stateFunction = stateFunctionFor(m_nextState); 96926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) ASSERT(stateFunction); 97926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 98197021e6b966cfb06891637935ef33fff06433d1Ben Murdoch#if ENABLE(ASSERT) 99926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) m_stateAuditTrail[m_nextStateAuditEntry] = m_nextState; 100926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) m_nextStateAuditEntry = (m_nextStateAuditEntry + 1) % s_sizeOfStateAuditTrail; 101926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)#endif 102926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) m_nextState = (static_cast<T*>(this)->*stateFunction)(); 103926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) } 104926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)} 105926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 106c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)} // namespace blink 107926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles) 108926b001d589ce2f10facb93dd4b87578ea35a855Torne (Richard Coles)#endif // SQLTransactionStateMachine_h 109