如果应用错过通知，该怎么办-SequenceNumber跳了一个或多个? [英] What to do if app misses notification - SequenceNumber jumps over by one or more?

问题描述

我现在在哪里?我已经通过office365的REST API订阅了日历通知.在创建/更新/删除该日历中的任何事件时，office365将通知发送到我在创建此订阅时分配的我的应用程序端点.订阅代码的工作原理就像一个超级按钮，通知会立即到来.

我真的想让我的代码容错，这就是问题所在:如果通知以非增量顺序出现，会发生什么?例如，如果有人首先创建事件，然后将其删除.那些通知可以相反的顺序吗? 1.移除事件，2.创建事件.我在文档中找不到此内容.

我真的对您在代码中处理SequenceNumber的方式很感兴趣.

文档表示:

SequenceNumber-通知的顺序编号，以帮助客户端应用程序识别是否缺少通知.

好的，很高兴知道我是否错过了通知，但是您能告诉我在这种情况下该怎么做吗?这似乎在任何地方都很难解释.

1. SequenceNumber的行为方式例如它们可以以非递增顺序出现吗?
2. 如果错过了SequenceNumber怎么办?

通过测试我发现了什么，我看到SequenceNumber始终是递增顺序的.但是我不确定是否总是这样?

更重要的是，如果我的应用程序错过了SequenceNumber怎么办?我的意思是，如果出现1、2、3，下一个是5或6，那我该怎么办?

我也不太确定ChangeType: Missed是否与此有关.我对此感到非常困惑，因此不胜感激！ :)

解决方案

我测试过的内容永远不会跳过SequenceNumber，但是好的做法是为每个订阅建立一个通知队列，并按SequenceNumber的顺序逐个处理通知. /p>

ChangeType:Missed并不能说明太多.它几乎告诉您只有哪些订阅错过了通知.通过日历集成，我最终检查了哪个日历对应于该subscriptionId，然后运行完全同步以验证我们是否错过了办公室中的任何更改.

Where I am right now? I have subscribed to calendar notifications via office365's REST API. When any event in that calendar are created/updated/deleted office365 sends notification to my app's endpoint which I assigned when I created this subscription. Subscription code works like a charm and notifications are coming immediately.

I really want to make my code error tolerant and here comes the problem: what happens if notifications are coming in non-incremental order? For example if someone first creates event and then removes it. Can those notifications come in opposite order? 1. remove event, 2. create event. I failed to find this in documentation.

I am really interested about how you have been handling SequenceNumber in your code.

This is what documentation says:

SequenceNumber - A number in sequence for a notification, to help the client app identify if it's missing a notification.

Okay, it's nice to know if I missed a notification, but can you tell me what to do in that case? This seems to be really poorly explained in anywhere.

1. How SequenceNumber behaves e.g. can they come in non-incremental order?
2. What to do if you miss a SequenceNumber?

What I have figured out by testing this, I see that SequenceNumber is always in incremental order. But I'm not sure is this always the case?

And more importantly, what to do IF my app misses SequenceNumber? I mean if there comes 1, 2, 3 and next one is 5 or 6, what should I do then?

Also I'm not quite sure if ChangeType: Missed has something to do with this. I'm really confused about this so any help would be appreciated! :)

解决方案

What I have tested it never jumps over a SequenceNumber, but good practice is to build a notification Queue per subscription and handle notifications one by one ordered by SequenceNumber.

ChangeType: Missed doesn't tell much. Pretty much it tells you only what subscription has missed notification. With calendar integration I ended up to check which calendar corresponds that subscriptionId and then just run full sync to validate if there has any changes in office we missed or not.

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