1. signal 事件定義

類型CMainSignals 來統(tǒng)一管理各個(gè)功能模塊的事件通知，CMainSignal 是一個(gè)資源管理類型， 主要工作代理給由unique_ptr 管理內(nèi)存的成員 m_internals , 它的類型是MainSignalsInstance，內(nèi)部定義十個(gè)boost signal 變量， 分別表達(dá)十種要通知的事件

class CMainSignals { private:std::unique_ptr<MainSignalsInstance> m_internals;void CMainSignals::BlockConnected(const std::shared_ptr<const CBlock> &pblock, const CBlockIndex *pindex, const std::shared_ptr <const std::vector<CTransactionRef>>& pvtxConflicted) {m_internals->m_schedulerClient.AddToProcessQueue([pblock, pindex, pvtxConflicted, this] {m_internals->BlockConnected(pblock, pindex, *pvtxConflicted);}); }struct MainSignalsInstance { boost::signals2::signal<void (const std::shared_ptr<const CBlock> &, const CBlockIndex *pindex, const std::vector<CTransactionRef>&)> BlockConnected;boost::signals2::signal<void (const std::shared_ptr<const CBlock> &)> BlockDisconnected; SingleThreadedSchedulerClient m_schedulerClient;std::unordered_map<CValidationInterface*, ValidationInterfaceConnections> m_connMainSignals;explicit MainSignalsInstance(CScheduler *pscheduler) : m_schedulerClient(pscheduler) {} };

2. 事件的訂閱者

類型CValidationInterface 主要是統(tǒng)一表示某些對(duì)MainSignalsInstance 中定義的十個(gè)事件感興趣的對(duì)象，所有對(duì)這些事件感興趣代碼繼承CValidationInterface類型，提供自己版本的這些虛成員函數(shù)的實(shí)現(xiàn)，覆蓋baseCValidationInterface 中對(duì)應(yīng)的空方法

class CValidationInterface { protected: ~CValidationInterface() = default; virtual void BlockConnected(const std::shared_ptr<const CBlock> &block, const CBlockIndex *pindex, const std::vector<CTransactionRef> &txnConflicted) {} ... }class BaseIndex : public CValidationInterface { protected:void BlockConnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* pindex,const std::vector<CTransactionRef>& txn_conflicted) override; ... }

3. 連接connect 和disconnect

• RegisterValidationInterface訂閱事件
• UnregisterValidationInterface取消

struct ValidationInterfaceConnections { boost::signals2::scoped_connection BlockConnected;boost::signals2::scoped_connection BlockDisconnected; };void RegisterValidationInterface(CValidationInterface* pwalletIn) { g_signals.m_internals->BlockConnected.connect (boost::bind(&CValidationInterface::BlockConnected, pwalletIn, _1, _2, _3));g_signals.m_internals->BlockDisconnected.connect (boost::bind(&CValidationInterface::BlockDisconnected, pwalletIn, _1));void UnregisterValidationInterface(CValidationInterface* pwalletIn) {g_signals.m_internals->BlockConnected.disconnect (boost::bind(&CValidationInterface::BlockConnected, pwalletIn, _1, _2, _3));g_signals.m_internals->BlockDisconnected.disconnect (boost::bind(&CValidationInterface::BlockDisconnected, pwalletIn, _1));

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