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Platform Description
The Fedora 4 platform is a ground-up reimagining of the Fedora repository architecture. We've built atop mature products in the content repository space to allow us to rapidly iterate to build a robust, scalable, and durable system.
Fedora 4 introduces has a number of new key features and stuff:
- a different kind of The Fedora object model that allows (and, even encourages) hierarchy
- "native" RDF expressions of object properties
- a RESTful RESTful HTTP API that is consistent and follow-your-nose
- integrated support for Durability
- asynchronous, event-driven Event-driven APIs
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Modeshape is an implementation of the JSR-283 Java API for content repositories ("JCR"). Fedora 4 wraps the Modeshape Java API with our own REST and Java APIs.
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Modeshape stores object metadata in an Infinispan cache. Binary content MAY be stored in Infinispan, on disk or in an alternative BinaryStore. Binary values are de-duplicated based on the SHA-1 hash of their content at the BinaryStore layer (meaning if you add 2 datastreams with identical content, it'll only store that 1 time in the storage system).
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- Clients (eg: such as Fedora 4) can access internal data (owned by ModeShape) and external data (owned by an external system) in exactly the same way, using the JCR API. ModeShape might cache this external data (for performance reasons), but it would never store any of this external data.
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