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  1. Lakesuperior Architecture
    2. 

  2. =========================
    3. 

  3. 

  4. Lakesuperior is written in Python and `Cython
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  5. <http://cython.readthedocs.io/>`__; the latter for lower-level components that
    6. 

  6. interface with C basic data structures for maximum efficiency.
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  7. 

  8. Aside from an optional dependency on a message queue server, Lakesuperior aims
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  9. at being self-contained. All persistence is done on an embedded database. This
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  10. allows a minimum memory and CPU footprint, and a high degree of scalability,
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  11. from :doc:`single-board computers <rpi>` to multi-core, high-load servers.
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  12. 

  13. Inefficient applications "get the job done" by burning through CPU cycles,
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  14. memory, storage and electricity, and spew out great amounts of carbon and
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  15. digits on cloud provider bills. Lakesuperior strives to be mindful of that.
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  16. 

  17. Multi-Modal Access
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  18. ------------------
    19. 

  19. 

  20. Lakesuperior services and data are accessible in multiple ways:
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  21. 

  22. -  Via HTTP. This is the canonical way to interact with LDP resources
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  23.    and conforms quite closely to the Fedora specs (currently v4).
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  24. -  Via command line. This method includes long-running admin tasks which
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  25.    are not available via HTTP.
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  26. -  Via a Python API. This method allows to use Python scripts to access
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  27.    the same methods available to the two methods above in a programmatic
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  28.    way. It is possible to write Python plugins or even to embed
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  29.    Lakesuperior in a Python application, even without running a web
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  30.    server. Also, only this way it is possible to access some of the lower-level
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  31.    application layers that allow to skirt much heavy-handed data processing.
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  32. 

  33. Architecture Overview
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  34. ---------------------
    35. 

  35. 

  36. .. figure:: assets/lakesuperior_arch.png
    37. 

  37.    :alt: Lakesuperior Architecture
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  38. 

  39.    Lakesuperior Architecture
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  40. 

  41. The Lakesuperior REST API provides access to the underlying Python API.
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  42. All REST and CLI operations can be replicated by a Python program
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  43. accessing this API.
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  44. 

  45. The main advantage of the Python API is that it makes it very easy to
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  46. maipulate graph and binary data without the need to serialize or
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  47. deserialize native data structures. This matters when handling large ETL
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  48. jobs for example.
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  49. 

  50. The Python API is divided in three main areas:
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  51. 

  52. -  Resource API: this API in charge of all the resource CRUD operations and
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  53.    implements the majority of the Fedora specs.
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  54. -  Admin API: exposes utility methods, mostly long-running maintenance jobs.
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  55. -  Query API: provides several facilities for querying repository data.
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  56. 

  57. 

  58. See :doc:`API documentation<api>` for more details.
    59.