Blogs Reviving MongoDB cache store

Reviving MongoDB cache store

May 04, 2023 Tags: cache store mongodb persistence

By Antonio Macrì

After a long period of inactivity, the MongoDB store is now back to life. It has been upgraded to work with Infinispan 15.

Reactive MongoDB driver

Since the Infinispan cache store API is now fully reactive, the store has also been modified to use the reactive MongoDB driver.

Database formats

The older MongoDB cache store worked by persisting keys and values as binary blobs. This should be the most efficient way, but it makes it harder to inspect the documents stored in Mongo. Therefore, the new implementation allows choosing between two formats:

binary: the binary format similar to that used with the previous MongoDB store:

[
  {
    "_id": {"$binary": {"base64": "mAEBigERCg9KDTAtNjc5LTc3NTQzLTk=", "subType": "00"}},
    "value": {"$binary": {"base64": "mAELigFLCkmCARBib29rX3NhbXBsZS5Cb29rigEzChpUaGUgV2luZC1VcCBCaXJkIENocm9uaWNsZRjNDyISCgZIYXJ1a2kSCE11cmFrYW1p", "subType": "00"}}
    ...
  }
]

structured: a structured BSON representation of the objects:

[
  {
    "_id": {
      "_type": "string",
      "_value": "0-679-77543-9"
    },
    "value": {
      "_type": "book_sample.Book",
      "title": "The Wind-Up Bird Chronicle",
      "publicationYear": 1997,
      "authors": [
        {
          "name": "Haruki",
          "surname": "Murakami"
        }
      ]
    },
    ...
  }
]

Expiration

The MongoDB store supports expiration. However, in order to ensure correctness the expired entries are removed from the database one by one, instead of using a bulk operation. Therefore, make sure this does not have a negative impact on MongoDB instances.

Get it, Use it, Ask us!

We’re hard at work on new features, improvements and fixes, so watch this space for more announcements!

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Antonio Macrì

Antonio is a software engineer with a passion for learning and a soft spot for physics. He enjoys experimenting with new technologies. Wannabe open-source contributor ...and baker.