1756-M08SEGK鄭州批發(fā)
在客戶(hù)端/服務(wù)器架構(gòu)下,客戶(hù)端要做的件事是實(shí)現(xiàn)與服務(wù)器的連接??蛻?hù)端通過(guò)一個(gè)連接地址(在此我們略過(guò)一些細(xì)節(jié)),將創(chuàng)建一個(gè)與服務(wù)器的會(huì)話通道。該會(huì)話包含一個(gè)安全的報(bào)文,其中包括可選擇的加密和身份驗(yàn)證等參數(shù)——用于識(shí)別服務(wù)器中的客戶(hù)端應(yīng)用程序和用戶(hù)是否匹配。客戶(hù)端還可以識(shí)別服務(wù)器,并決定是否允許與該服務(wù)器通信。
會(huì)話建立之后,客戶(hù)端應(yīng)用程序可以從服務(wù)器請(qǐng)求一些標(biāo)準(zhǔn)服務(wù)。這些服務(wù)包括:
1. 連接并創(chuàng)建會(huì)話
2. 瀏覽地址空間——查找服務(wù)器上可用的內(nèi)容
3. 讀取-變量值或原始數(shù)據(jù)
4. 寫(xiě)入-變量值或原始數(shù)據(jù)
5. 調(diào)用方法
6. 閱讀歷史信息-變量和事件
7. 關(guān)閉會(huì)話并斷開(kāi)連接
所以最后,當(dāng)客戶(hù)端完成需求時(shí),它將關(guān)閉會(huì)話并斷開(kāi)連接。
02
客戶(hù)端/服務(wù)器訂閱
客戶(hù)端/服務(wù)器模型內(nèi)還包含一個(gè)訂閱模型。在這個(gè)模型中,每個(gè)客戶(hù)端可以創(chuàng)建任意數(shù)量的服務(wù)器訂閱(在此的訂閱為訂閱功能)。每個(gè)訂閱都可以包括變量、EventNotifier的MonitoredItems(具有EventNotifier屬性集的對(duì)象節(jié)點(diǎn))。
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