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OF-2530: Optimize MUC Message History cache usage #2134

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OF-2530: Optimize MUC Message History cache usage #2134

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Commits on Oct 19, 2022

  1. OF-2530: Optimize MUC Message History cache usage 

    When reading or writing cached MUC messages, the entire collection of messages is serialized between cluster nodes. This adds an unacceptable amount of overhead, for every message that is added.

In this commit, the singular cached entity (a list of messages), is separated into two parts:
- A cached entity that represents a list of message references per chatroom
- messages, by reference

The purpose of this is to optimize the scenario of  adding a message (which is expected to happen more frequently than reading the history). By having to update only a list of references, instead of a list of actual objects, the amount of data that is to be operated on is reduced significantly.
    @guusdk
    guusdk committed Oct 19, 2022
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