在同一个Java应用程序的不同实例之间共享数据结构的最佳方法？

Question

Currently, I'm developing an application based on spring boot. One of the requirements is that the application should be real-time and I need some kind of unique data structure based on InvertedRadixTree (not exactly this but data strucutre is using the tree to answer the queries). I developed an admin UI for crud operations. The number of cruds are not so much and basically will be done by OPs employees. the data structure that I developed is thread safe and is synchronized by database(which is mongodb) and since this is the only app using this database, I'm not worried about the other apps messing up with the data. The only problem that I have is that if we have multiple instances of this app, and one of them do some crud operations on mongodb; although the data structure of this instance will get updated, the other instance will not be updated. I created an scheduler to update the data structure from database every 12 hours, but I'm looking for another solution like sharing data structure between all the instances. I really appreciate every suggestions.

EDIT: After searching around, I found that updating the whole data structure doesn't take to much. I wrote some test cases and put around a million record of my class inside mongodb and fetched the whole collection. Fetching and data structure creation took less than a second. So I ended up using this method instead of using some sophisticated method for synchronizing memory and database.

Answer 1

One of the suggestion can be that you can use a shared database. Every time there is an update by any of the APP,It should be updated in the database.And every time you have to use the data you will have to load the fresh data from the database.This is the easiest way as far as i think ..!!!

Answer 2

我会使用类似redis http://redis.io/topics/pubsub之类的东西，并监听为该实例触发的事件以进行更改，如果数据不经常更新，则在每个实例上使用一些本地缓存