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https://issues.apache.org/jira/browse/LUCY-110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marvin Humphrey updated LUCY-110:
---------------------------------
Attachment: arch.patch
This diff introduces the Architecture class, discussed numerous times in both
Lucy and Lucene forums as one approach to the modularization problem for index
writers and readers.
There is a division of labor between the two configuration classes
Lucy::Plan::Architecture and Lucy::Index::IndexManager:
* Architecture is responsible for unchanging aspects of the index, for
instance what indexing components (document writer/reader pair, posting
list writer/reader pair, etc.) will be used.
* IndexManager is responsible for ephemeral, per-session configuration, such
as lock factory, merge policy, etc
Architecture uses a registration model rather than factory methods to
initialize index subcomponents. An earlier prototype used factory methods,
but the argument lists of factory methods render them more fragile and less
extensible. Under a registration model, it's easier for Architecture to
extract needed arguments from the object being modified as needed --
otherwise, it is necessary to break back compat to add arguments to a factory
method.
{code:none}
- public incremented DeletionsReader*
- Make_Deletions_Reader(Architecture *self, Schema *schema, Folder *folder,
- Snapshot *snapshot, Segment *segment);
+ public void
+ Register_Deletions_Reader(Architecture *self, SegReader *reader);
{code}
Architecture objects are normally spawned using a factory method by Schema,
so in order to change the Architecture, you must subclass Schema. (This
spares us from having to serialize Architecture objects within the Schema json
file.) It is an advanced class, available to experts but invisible to
newcomers.
This patch also introduces stub classes for Lucy::Plan::SegWriter and
Lucy::Plan::SegReader.
> Architecture
> ------------
>
> Key: LUCY-110
> URL: https://issues.apache.org/jira/browse/LUCY-110
> Project: Lucy
> Issue Type: New Feature
> Components: Core - Plan
> Reporter: Marvin Humphrey
> Assignee: Marvin Humphrey
> Attachments: arch.patch
>
>
> Lucy::Plan::Architecture encapsulates unchanging index configuration data
> needed by index readers and writers, such as choice of index
> subcomponents.
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