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Supported Backends

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Yoann Vernageau edited this page Jun 3, 2018 · 9 revisions

NeoEMF is designed to be easily extensible with new backends. The current version of the framework embeds three implementations that are optimized for specific modeling operations.

NeoEMF currently supports these different backends:

  • MapDB: relies on MapDB on-disk maps to store model elements. This backend has been designed to provide fast access to atomic operations, such as accessing a single element/attribute and navigating a single reference. This implementation is optimized for EMF API-based accesses which typically generates this kind of atomic and fragmented queries calls on the model.

    WARNING: Can be very slow on Windows (see jankotek/mapdb#789 for more information)

  • BerkeleyDB: relies on BerkeleyDB on-disk maps to store model elements. Very similar to MapDB.

  • Blueprints: relies on the Tinkerpop Blueprints to access graph databases. The current implementation embeds a Neo4j wrapper for convenience purposes, but Blueprints also allows to access any NoSQL database implementing the Tinkerpop stack, such as OrientDB or Titan. This backend has been designed to benefit from the rich traversal features that graph databases provide, such as fast shortest-path computation, or efficient processing of complex navigation paths. These advanced query capabilities have been used in the Mogwaï tool that maps OCL expressions to graph traversals.

  • HBase: relies on the distributed nature of the column-based datastore to enable the development of distributed MDE-based applications. In contrast with the previous implementations, the HBase backend offers concurrent read/write capabilities and guarantees ACID properties at model element level. It exploits the wide availability of distributed clusters in order to distribute intensive read/write workloads across datanodes. The distributed nature of this persistence solution is used in the ATL-MR tool, a distributed engine for model transformations in the ATL language on top of MapReduce.

Versions

The table below summarizes the versions of each backend that are currently supported by NeoEMF.

Backend Version
Default in-memory (ChronicleMap) 3.14.5
Blueprints 2.6.0
Neo4j1 2.1.8
MapDB 3.0.5
BerkeleyDB 5.0.73
HBase 1.3.1
Hadoop2 2.8.2

1 Neo4j is supported through the Blueprints interface.

2 Hadoop is internally used by the HBase implementation.

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