Resets the whole Etl object. Deletes all modifiers and resets the state.
Starts the etl process. First, all extractors are run in parallel and deliver their results into an observable. Once the buffer gets a result, it transfers all objects through the transformers (one by one). After that, the transformed results are run through all loaders in parallel.
Observable that completes when the process is finished, during the "next" process step you get update on how many are processed yet. Throws when any step produces an error.
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ETL Class. Instantiate one and add as many extractors, transformers and loaders as you want. Then start the whole process with ".start()".
This processor is modular, you can find other implemented loaders and extractors in the README