Dynamic lookup service in a distributed system

A non-transitory computer-readable medium containing instructions for controlling a data processing system having a lookup service with associated network services available in a distributed system and having a client computer comprising memory including a client, a client lookup manager and a cache that is locally stored within the memory, the instructions further causing the data processing system to perform a method comprising:

• transmitting a request for discovery of at least one lookup service by the client lookup manager;
• receiving said request by a discovery server;
• transmitting a first object, responsive to the request, to the client lookup manager, wherein the first object provides a reference to at least one lookup service;
• receiving said first object by the client lookup manager;
• storing the lookup service reference in the cache for subsequent access of the lookup service;
• using the reference to register a callback routine with the at least one lookup service;
• observing at least one update to the at least one lookup service;
• determining that the callback routine has been registered with the lookup service;
• transmitting, based on the observing and determining, a second object by the at least one lookup service that identifies the at least one update;
• and
• receiving said second object by at least one of the client and the client lookup manager.

A non-transitory computer-readable medium containing instructions for controlling a data processing system having a lookup service with associated network services available in a distributed system and having a client lookup manager with an associated cache, the instructions further causing the data processing system to perform a method comprising:

• transmitting a request for discovery of at least one lookup service by the client lookup manager;
• receiving said request by a discovery server;
• transmitting an object, responsive to the request, to the client lookup manager, wherein the object provides a reference to at least one lookup service;
• receiving said object by the client lookup manager;
• using the reference to register a callback routine with the lookup service by the client lookup manager;
• observing, by the at least one lookup service, a change to one of the associated network services;
• determining that the callback routine has been registered with the lookup service;
• transmitting, based on the observing and determining, an event by the at least one lookup service, said event notifies the client lookup manager of the observed change;
• receiving said event by the client lookup manager;
• and
• updating the cache to reflect the observed change.