Python for OSGi Remote Services
The iPOPO project helps in making available parts of the standard OSGi framework for Python. Read on to find out more.
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The iPOPO project is a Python implementation of key parts of a standard OSGi framework...e.g. bundles, the service registry and servicereference API, and a dynamic service injection framework similar to the Apache iPOJO project...thus the name iPOPO.
With the 0.8.0 release of iPOPO, there is now a Python implementation of the OSGi Remote Services and Remote Service Admin (RSA) specifications. To distinguish from the previously-provided remote services in iPOPO, this is known as RSA Remote Services.
iPOPO's RSA Remote Services has many of the same advantages as Java-based Remote Services/RSA. Some of these advantages:
Decoupling - Name/service contract is decoupled from the implementation (and distribution).
Dynamics - The service registry's dynamic behavior, along with all notifications, etc. is available in Python.
Injection and Service Dependency Management - iPOPO provides service injection and dependency management, built upon the Python API.
Standard RemoteServiceAdmin Management Agent, RSA Console Commands
API for Distribution and Discovery Providers - There are documented APIs for creating new distribution and discovery providers, making it easy to support other transports and implementations for distribution (e.g. REST/JaxRS, Jsonrpc, MQTT, Zeroconf Discovery, etc).
Other advantages of Java-based OSGi services are described here. All of these advantages apply to Python/iPOPO-based services, but Python can be used to implement and/or consume services.
Currently, there are two distribution providers included with iPOPO 0.8.0: XmlRpc, Python-Java and one discovery provider. See here for tutorials showing their usage with included sample remote services.
Other distribution and discovery providers are being considered or worked on. If you are interested in seeing a particular transport supported for distribution or discovery please open an issue on the iPOPO project.
Remote Services Between Python and Java
The Python-Java distribution provider makes it possible to use OSGi Remote Services between Python and Java...on both sides. This allows Remote Services to be exported from Python, and discovered/imported and consumed in Java, or exported from Java and discovered/imported/consumed from Python. See here for a sample and tutorial. These capabilities and the underlying distribution provider will be described in more detail in a subsequent posting.
Published at DZone with permission of Scott Lewis, DZone MVB. See the original article here.
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