OSGi Remote Services and ECF
Chapter 13 in the OSGi 4.2 compendium specifies a new standard for service-oriented architecture (SOA). This standard uses the well-established OSGi service registry to expose remote services...i.e. OSGi services that maybe easily distributed on a network.
ECF's support for this standard is implemented as a layered set of application programming interfaces (APIs). The modular structure allows service builders and service consumers to use an 'ala carte' model for defining, creating, deploying, integrating, and running distributed services. Such an 'ala carte' model is helpful for implementing distributed applications for two primary reasons:
- It reduces overall system complexity. Networked/distributed applications frequently can quickly become very complicated. By only including modules that are actually necessary, rather than including/requiring functionality needed to support other use cases for distributed services, overall system complexity is reduced. For a lucid presentation about the value of modularity for simplifying complicated systems, see How Module Systems Drive Architectures.
- It provides flexibility. Networked applications frequently require a good deal of flexibility...i.e. the flexibility to replace one transport with another, one security model for another, one deployment and management approach with another, synchronous RPC with asynchronous messaging. The flexibility of using OSGi modularity and ECF allows service developers and consumers to mix-and-match transport protocols and serialization formats, supports interoperability and integration with existing systems, and supports use of synchronous and/or asynchronous invocation patterns as needed.
Here is a diagram showing the ECF modules implementing the OSGi remote services standard
Here are two examples (with source) showing the use of ECF's remote services to expose and access a 'hello world' remote service.
- RFC119 - Getting Started with ECF's OSGi Remote Services Implementation
- Remote Services API - Getting Started with Using the ECF Remote Services API
|Eclipse Communication Framework|
|API Documentation • Javadoc • Providers|
|Development Guidelines • Integrators Guide|