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Patterns in Universal Plug & Play

Patterns in Universal Plug & Play. Markus Alexander Wischy. Pick and verify. Motivation: Avoiding a central resource manager for allocating resources Solution Randomly choose a resource Verify that this resource is not in use (multicast/broadcast)

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Patterns in Universal Plug & Play

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  1. Patterns in Universal Plug & Play Markus Alexander Wischy OOPSLA 2000, Jini Pattern Language Workshop

  2. Pick and verify • Motivation: • Avoiding a central resource manager for allocating resources • Solution • Randomly choose a resource • Verify that this resource is not in use (multicast/broadcast) • Use the resource or choose another resource • Known uses • Used in Auto-IP (for IP adresses) OOPSLA 2000, Jini Pattern Language Workshop

  3. Lease and Locator • Leases can provide a soft state • Add robustness to changing environments • Additional update messages provide more actuality to the soft state • Adding Queries and complementary Announcement messages provide means to balance actuality and network traffic • Lease messages can contain other information (e.g. location), avoiding futher messages or central components OOPSLA 2000, Jini Pattern Language Workshop

  4. Other concepts • XML Descriptions • Standardized DTD can provide Introspection functionality • Multicast/Broadcast • Avoiding a central component in the network • Fails to scale to large networks OOPSLA 2000, Jini Pattern Language Workshop

  5. Discussion points • The pick and verify schema of Auto-IP can be described as a pattern • XML descriptions provide Introspection functionality • Soft states are an important concept of leases • Lease renew messages can contain additional information (e.g. location) • Location information can be distributed by a distributed algorithm, avoiding a central component in the network OOPSLA 2000, Jini Pattern Language Workshop

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