英文:
Listen to field's value change of MongoDB's document with Spring
问题
根据我的用例，在用户注册到我的网站时，将在用户集合中创建以下文档。
{
"_id": "xxxx",
"name": "xxxx",
"hash": "xxxx",
"salt": "xxxx",
"approved": false
}
只有在管理员批准后，用户的注册请求才会被接受。管理员不会在注册后立即批准，通常需要一天以上的时间来查看注册请求列表。在管理员批准后，上述文档将会变成如下：（approved 字段变为 true）
{
"_id": "xxxx",
"name": "xxxx",
"hash": "xxxx",
"salt": "xxxx",
"approved": true
}
下面这两个函数是使用 Spring 实现的。
public void createRegistrationRequest(User obj) {
// 逻辑
}
public void executeAfterApproval() {
// 逻辑
}
当 approved 字段的值变为 true 时，应该执行 executeAfterApproval() 方法。如何监听此字段的值变化并触发方法在 Spring 中的执行？
附注：实际上，原始用例有点难以解释，因为它与内部情景更相关。因此，将情景翻译为用户注册，以便更容易理解问题。
英文:
According to my use-case, whenever a user is registered to my site, the following document will be created in User collection.
{
"_id": "xxxx",
"name": "xxxx",
"hash": "xxxx",
"salt": "xxxx",
"approved": false
}
Only after the admin's approval, the user's registration request will be accepted. The admin won't approve immediately after the registration and generally takes more than a day to look at the registration request list. After admin's approval, the above document changes like below: (approved field changes to true)
{
"_id": "xxxx",
"name": "xxxx",
"hash": "xxxx",
"salt": "xxxx",
"approved": true
}
The below two functions are implemented with spring.
public void createRegistrationRequest(User obj) {
// logic
}
public void executeAfterApproval() {
// logic
}
The executeAfterApproval() method should execute when the approved field value changes to true. How to listen to this field's value change and trigger the method's execution with Spring?
PS: Actually, the original use-case is a bit difficult to explain as it is more related to internal scenarios. So, translated the scenario as user registration for an easy understanding of the problem.
答案1
得分: 1
你应该使用MongoDB的变更流（change streams）。如果你正在使用Spring Data，它对命令式和响应式驱动程序都有支持。你可以使用变更流来监听用户集合的变更，并且可以应用一些条件来使其更加具体。
查看：https://docs.spring.io/spring-data/mongodb/docs/current/reference/html/#change-streams
英文:
You should use MongoDB change streams. If you are using Spring Data it has support for both imperative and reactive drivers. You can use a change stream for listening to User collection changes and apply some criterias to be more specific.
Check: https://docs.spring.io/spring-data/mongodb/docs/current/reference/html/#change-streams
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