An Integration Daemon is an OMAG Server that provides metadata exchange services between third party technology and the open metadata ecosystem.
Each integration daemon is paired with an access service and supports a particular class of technology.
Figure 1: The integration daemon sitting between a third party technology and a metadata access point / metadata server
To understand how an integration daemon works, it is necessary to look at a bit more detail at how technologies can be connected together to exchange metadata.
Figure 2 show the four major mechanisms for how a particular technology supports integration.
Figure 2: Four types of integration capabilities that could be offered by a technology
Figure 3: Integrated technology can call the open metadata services or consume the open metadata services directly
The Integration Daemons provide support for the Passive Open Technology and the Active Open Technology. This is shown in Figure 4.
Figure 4: Using the integration daemon to integrate both passive and active open technology into the open metadata ecosystem
For Passive Open Technology, the integration daemon will continuously poll the technology’s API to determine if anything has changed and then pass any changes to the metadata access point / metadata server. It also listens for events from its access service’s Out Topic. If there is new metadata that is of interest to the third party technology the integration daemon passes it over.
The Active Open Technology support is similar except that rather than polling for changes in the third party technology, the integration daemon will listen on the third party technology’s event topic and translate the events it receives and passes the information onto the access service.
The code that manages the specific APIs and formats of the third party technology is encapsulated in a connector. The specific type of connector is defined by each type of integration daemon. The connectors are passed a context object that enables the connector to call either the associated access service REST API, or to push events to the access service’s In Topic.
The integration daemons defined in Egeria today are as follows:
Virtualizer manages the configuration of a data virtualization platform.
All are under development and do not yet support all of the integration patterns. However over time, the number of integration daemons will grow so that there is at least one for each access service and most will support both of the patterns described above.
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