MicroKernel & NodeStore

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Jukka Zitting

Technologie

MicroKernel &
NodeStore
two sides of the same coin

MicroKernel (interface)
 Designed with remoting and potential
non-Java implementations in mind
 RPC-like, with JSON/P serialization
 Two main implementations:
 MongoMK (the new MongoDB-based MK)
 “H2” MK (old one, to be deprecated)

NodeStore
 Mapping of MK concepts to an object-
oriented, native Java set of interfaces
 Omissions: direct journal access, filter rules
 Extensions: NodeBuilder, NodeStateDiff
 No serialization, random access possible
 Three main implementations
 MemoryNodeStore (for testing, utilities)
 KernelNodeStore (MK mapping)
 SegmentNodeStore (the Segment/TarMK)

MicroKernel (architecture)
 Key points
 Basic content tree model
 MVCC-based revisions
 Merging of concurrent changes
 Any implementation a “MicroKernel”,
regardless of the specific interface

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MicroKernel & NodeStore

1. MicroKernel & NodeStore two sides of the same coin

2. MicroKernel (interface)  Designed with remoting and potential non-Java implementations in mind  RPC-like, with JSON/P serialization  Two main implementations:  MongoMK (the new MongoDB-based MK)  “H2” MK (old one, to be deprecated)

3. NodeStore  Mapping of MK concepts to an object- oriented, native Java set of interfaces  Omissions: direct journal access, filter rules  Extensions: NodeBuilder, NodeStateDiff  No serialization, random access possible  Three main implementations  MemoryNodeStore (for testing, utilities)  KernelNodeStore (MK mapping)  SegmentNodeStore (the Segment/TarMK)

4. MicroKernel (architecture)  Key points  Basic content tree model  MVCC-based revisions  Merging of concurrent changes  Any implementation a “MicroKernel”, regardless of the specific interface