詳解Remoting序列化及租約
今天就先談?wù)凴emoting序列化的問(wèn)題：首先，Remoting序列化是為了方便網(wǎng)絡(luò)傳輸，把遠(yuǎn)程對(duì)象轉(zhuǎn)化為網(wǎng)絡(luò)可傳輸?shù)男问?。Remoting序列化可以實(shí)現(xiàn)多種形式：序列化為xml、序列化為二進(jìn)制等等。當(dāng)然使用序列化需要添加一個(gè)標(biāo)記【Serializable】,而且可以用SerializableAttribute,或是實(shí)現(xiàn)ISerializable接口。下面放個(gè)序列化的代碼Demo：
1: [Serializable]
2: public class SumOf
3: {
4: public SumOf()
5: {
6: }
7:
8: public DecimalList Members = new DecimalList();
9:
10: public decimal Sum,Avg;
11:
12: public void Calculate()
13: {
14: this.Sum = 0;
15: foreach (decimal m in Members)
16: {
17: Sum += m;
18: }
19: this.Avg = Sum / Members.Count;
20:
21: }
22:
23: }
24: [Serializable]
25: public class DecimalList : List<decimal>
26: {
27: }
1.對(duì)象的生命周期
我們先來(lái)認(rèn)識(shí)一下什么是對(duì)象，對(duì)象就是內(nèi)存里的數(shù)據(jù)結(jié)構(gòu)。先說(shuō)客戶機(jī)檢測(cè)服務(wù)器是否可用，那我們就要驗(yàn)證遠(yuǎn)程對(duì)象是否還存在。這個(gè)很簡(jiǎn)單，我們只要調(diào)用遠(yuǎn)程對(duì)象，如果遠(yuǎn)程對(duì)象不可用，會(huì)出現(xiàn)異常，那說(shuō)明服務(wù)器不可用。接著說(shuō)服務(wù)器檢測(cè)客戶機(jī)是否可用，使用垃圾回收機(jī)制驗(yàn)證，只對(duì)Singleton對(duì)象和客戶端激活對(duì)象有效。
2.什么是租約
租約是在服務(wù)器記錄的一個(gè)時(shí)間，如果超過(guò)這個(gè)時(shí)間，對(duì)象會(huì)被回收。
3、續(xù)約：為了讓對(duì)象繼續(xù)存在就必須使用續(xù)約
（1）隱式續(xù)約:每次調(diào)用遠(yuǎn)程對(duì)象上的方法的時(shí)候自動(dòng)進(jìn)行。
（2）顯示續(xù)約：使用ILease.Renew()方法實(shí)現(xiàn)。
（3）發(fā)起租約：租約管理者自動(dòng)續(xù)約。ILease.Register()
租約的配置：InitialLeaseTime 租約時(shí)間，默認(rèn)值 300 。RenewOnCallTime檢查時(shí)間 默認(rèn)值120 。SponsorshipTimeout過(guò)期時(shí)間 默認(rèn)值120。LeaseManagerPollTime租約管理者臨行時(shí)間 默認(rèn)值10
如何顯示租約信息：
1: ILease lease = (ILease)obj.GetLifetimeService();
2:
3: if (lease != null)
4: {
5: Console.WriteLine("Lease Configuration:");
6: Console.WriteLine("InitialLeaseTime: " +
7: lease.InitialLeaseTime);
8: Console.WriteLine("RenewOnCallTime: " +
9: lease.RenewOnCallTime);
10: Console.WriteLine("SponsorshipTimeout: " +
11: lease.SponsorshipTimeout);
12: Console.WriteLine(lease.CurrentLeaseTime);
13: }
如何配置租約信息：
1代碼方式
1: public override Object InitializeLifetimeService()
2: {
3:
4: ILease lease = (ILease)base.InitializeLifetimeService();
5: // Normally, the initial lease time would be much longer.
6: // It is shortened here for demonstration purposes.
7: if (lease.CurrentState == LeaseState.Initial)
8: {
9: lease.InitialLeaseTime = TimeSpan.FromSeconds(3);
10: lease.SponsorshipTimeout = TimeSpan.FromSeconds(10);
11: lease.RenewOnCallTime = TimeSpan.FromSeconds(2);
12: }
13: return lease;
14: }
2配置文件方式1: <lifetime
2: leaseTime="7M"
3: sponsorshipTimeout="7M"
4: renewOnCallTime="7M"
5: />
本文來(lái)自零末的博客園文章《Remoting學(xué)習(xí)歷程（2）》
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