The 2 main interfaces are BatchOpIndexer and SingleObjectIndexer.

To perform batch indexing, clients must provide the following:

• ObjectQueue: the objects to be reindexed
• ObjectToDocumentConverter: converts objects to Lucene documents
• DocumentWritingScheme: provides the actual logic of how to write documents to index
• ProgressMeter: to track the progress of the indexing process

Possible implementations of the indexing include:

• writing documents to temporary index/indices and merging to the final index location
• writing documents to separate final indices depending on the nature of the documents
• obtaining references/handles to objects at the queue stage and actually loading from persistence on demand to conserve memory usage
• running indexing with multiple threads so that no single object/file seriously bottlenecks the indexing operation