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From "Marvin Humphrey (JIRA)" <>
Subject [jira] Resolved: (LUCY-118) Lucy::Index::DataReader - Abstract base class for reading index data.
Date Fri, 25 Jun 2010 01:43:49 GMT


Marvin Humphrey resolved LUCY-118.

    Resolution: Fixed

Committed as r957777.

> Lucy::Index::DataReader - Abstract base class for reading index data.
> ---------------------------------------------------------------------
>                 Key: LUCY-118
>                 URL:
>             Project: Lucy
>          Issue Type: New Feature
>          Components: Core - Index
>            Reporter: Marvin Humphrey
>            Assignee: Marvin Humphrey
>            Priority: Blocker
>         Attachments: DataReader.bp, DataReader.c,
> DataReader is an integral part of our modular index system, serving as a base
> class for all component classes which read from the index - including both
> single-segment readers and composite multi-segment readers.  Index components,
> which may be added or omitted using Architecture, typically consist of a
> DataReader/DataWriter pair, e.g.  PostingListReader/PostingListWriter.
> DataReader's members include a Schema and a Folder, a Snapshot which defines
> the files the DataReader may access safely, and an array of Segment objects.
> Single-segment readers are assigned to one Segment within the array, but also
> get access to all the other Segments; this is important, because metadata from
> older or newer Segments may be used to make decisions and control behavior.

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