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Medici extractors typically serve to automatically extract some new kind of information from a file's content when it is uploaded into Medici. These extractors do this by connecting to a shared RabbitMQ bus. When a new file is uploaded to Medici it is announced on this bus. Extractors that can handle a file of the type posted on the bus are triggered and the data they in turn create is returned to Medici as derived data to be associated with that file. The extractors themselves can be implemented in a variety of languages. Examples of these extractors in different languages can be found in the STASH extractors-templates repository.
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An extractor must establish a connection with the Medici RabbitMQ bus, handle incoming messages, start jobs based on received messages, and ultimatley carry out a job on a given file. The example below simply counts the number of words in a document and returns this information as a piece of metadata to be associated with the file.
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