Electronic Design

Service Identification And Location

Universal Plug And Play

  • Uses XML, SOAP, and HTTP
  • Broadcast based
  • Does not need locator service

Universal Plug and Play (UPNP) supports discovery and control of devices by control points, such as a PC. It supports zero configuration with automatic discovery through the use of broadcasts when control points or devices are added. It also supports hierarchical devices and gateways to non-UPNP devices.

More information is available at www.upnp.org.

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  • Centralized locator service
  • Supports service management
  • Services can be started remotely
  • Incorporates a security model
  • Supports lease-based services
  • Two-phase commit transactions
  • Requires Java VM on all nodes

Jini, a Java-based architecture, supports distributed management of services. Services and their attributes are registered with the locator service. Clients then activate services directly.

More information is available at www.sun.com.

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OSGi Gateways

  • Gateway between standards-based and proprietary devices
  • Dynamic invocation of services
  • Works with standards-based clients
  • Requires Java VM on gateway

The Open Systems Gate-way Initiative (OSGi) provides a Java-based platform for ser-
vices, including those for linking proprietary devices to standards-based clients. A gateway also can provide access to services on a PDA, cell phone, PC, or other device.

One or more services are contained in bundles that execute in a bundle context. The OSGi framework in-cludes a number of standard services, such as a Web server and management services.

More information is available at www.osgi.org.

See associate figure

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