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The Adapter integration pattern enables an existing metadata repository repositories and tool set sets to integrate into the open metadata ecosystem.  It requires the development of simple components that map between the proprietary metadata formats and the open metadata formats plus manage notifications around the activity occurring with the metadata repository. A metadata repository needs the following capabilities to support the adapter pattern: A remotely callable interface (API) that allows metadata to be queried, created, updated and deleted. The generation of event notifications whenever metadata changes in the metadata repository. The API is wrapped in an OMRS Connector implementation that maps open metadata repository service calls to the API of the metadata repository.   The event notifications are captured and mapped into the OMRS Events which are then published to the other metadata repositories in the cluster.

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The equivalent flow for a metadata repository cluster that contains metadata repositories that natively support the OMRS interfaces directly is shown here.

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Figure 2 shows the deployment of the adapter integration pattern components for a metadata repository and toolkit called XYZ.  It assumes the Enterprise OMRS Connector is configured to access metadata from multiple open metadata repositories, and one of these repositories is XYZ.  The XYZ OMRS Connector has been contributed to Apache Atlas so it can be called directly from the Enterprise OMRS Connector.  When calls are made to the Open Metadata Access Services (OMASs) the Enterprise OMRS Connector passes the request onto each of its configured OMRS connectors.  When it is the turn of the XYZ OMRS Connector, it translates the OMRS call into an XYZ REST Call and maps the response back to OMRS format and returns it to the Enterprise OMRS Connector.  The Enterprise OMRS Connector aggregates the responses from each of the OMRS Connectors and returns them to its caller.   New metadata is also being created through the XYZ toolkit user interfaces (see bottom left of figure 2).  These updates result in notifications that are processed by the XYZ Event Mapper and converted into OMRS event notification messages and posted on the OMRS Topic where they are picked up both by other metadata repositories through OMRS and other tools through the OMASs.

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