Architecture and Design

Design principles

Modular: The pipeline is built from small, composable parts.
Extensible: It is easy to add new parts to the pipeline by extending straightforward traits.
Performance: Performance and ease-of-use are the main goals of the library. Performance always has priority.
Tracable: tracing is used throughout the pipeline.

Simple: The API should be simple and easy to use.
Sane defaults, fully configurable: The library should have sane defaults that are easy to override.
Builder pattern: The builder pattern is used to create new instances of the pipeline.

Pipeline: The main struct that holds the pipeline. It is a stream of Nodes.
Node: The main struct that holds the data. It has a path, chunk and metadata.
IndexingStream: The internal stream of Nodes in the pipeline.
Loader: The starting point of the stream, creates and emits Nodes.
Transformers: Some behaviour that modifies the Nodes.
BatchTransformers: Transformers that transform multiple nodes.
Chunkers: Transformers that split a node into multiple nodes.
Storages: Persist the Nodes.
NodeCache: Filters cached nodes.
Integrations: External libraries that can be used with the pipeline.

from_loader (impl Loader) starting point of the stream, creates and emits Nodes
filter_cached (impl NodeCache) filters cached nodes
then (impl Transformer) transforms the node and puts it on the stream
then_in_batch (impl BatchTransformer) transforms multiple nodes and puts them on the stream
then_chunk (impl ChunkerTransformer) transforms a single node and emits multiple nodes
then_store_with (impl Storage) stores the nodes in a storage backend, this can be chained

Additionally, several generic transformers are implemented. They take implementers of SimplePrompt and EmbeddingModel to do their things.