基于当前事件触发未来事件
我想根据当前正在发生的事件在将来的某个时间触发一个事件。我不期望音量太高，所以我更关心简单性而不是性能。
例如：
- 事件A发生。我需要事件 B 在一天后发生（时间要求不高），
- 系统在数据库中存储事件记录，
- 正在进行的过程会查看数据库，并执行准备好的事件 B，并将它们从数据库中删除，
这有意义吗？我正在 Rails 上使用 Ruby - 我想这是一个相当常见的用例
i would like to trigger an event sometime in the future based on an event that is currently happening. I do not expect the volume to be too high, so i care a lot more about simplicity than performance.
For example:
- event A happens. i need event B to happen a day later (not time critical)
- system stores a record of event in db
- ongoing process looks through the db, and executes the event Bs that are ready, and removes them from db
Does this make sense? I am using Ruby on rails - I imagine this is a fairly common usecase
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使用 DelayedJob gem。请参阅此屏幕广播了解更多详细信息。
Use the DelayedJob gem. Refer to this screen-cast for more details.
是的，这绝对有道理:)。您可能应该查看调度程序或在后台运行的进程。看看这里和< a href="http://inventivelabs.com.au/weblog/post/scheduling-periodic-tasks-in-a-rails-application/" rel="nofollow noreferrer">此处
基本上，无论何时完成执行事件 A 时，您将在数据库中放入一个条目，其中有一个字段指示它何时应该运行。正如您所说，您正在进行的进程应该安排在后台运行，可以分步安排，也可以进行轮询并查询数据库，然后像您所说的那样从那里继续进行。
Yes it absolutely makes sense :). You should be probably looking at a Scheduler or a process that runs in the background. Take a look here and here
Basically, whenever you finish executing your event A, you will be putting an entry in the database with a field indicating when it should run. As you say, your ongoing process which should be scheduled to run in the background can either be scheduled in steps or do a polling and query the DB and carry on from there like you've said.