Distributed directory service and message routing for mobile agents

Distributed directory service and message routing for mobile agents

A Fault-Tolerant Distributed Directory Service for Mobile Agents

Two major approaches have been proposed to route messages transparently to mobile agents. Either messages may be sent to a fixed “home agent”, which forwards them to mobile agents, or messages may follow forwarding pointers left by mobile agents. A home agent appears as a single point of failure: when it exhibits a failure, it becomes impossible to track mobile agents or to route messages to th...

Reliable Directory Service and Message Delivery for Large-scale Mobile Agent Systems

In this paper, we introduce a reliable directory service and message delivery mechanism for large-scale mobile agent systems to address both agent mobility and directory service node failures. The mechanism enables each mobile agent to keep its forwarding pointer only on the small number of its visiting nodes in an autonomous manner. As this desirable feature has every mobile agent’s migration ...

A Distributed Directory Service for Greenstone

Greenstone is a software for creating and maintaining distributed digital library collections. It provides a sophisticated federation mechanism for the collections. In order to support alerting notification about changes in the distributed collections, we propose a distributed directory service for the management of the distributed Greenstone installations. The Greenstone directory service (GDS...

Query Routing in the TerraDir Distributed Directory

We present the design and evaluation of the query-routing protocol of the TerraDir distributed directory. TerraDir is a wide-area distributed directory designed for hierarchical namespaces, and provides a lookup service for mapping keys to objects. We introduce distributed lookup and caching algorithms that leverage the underlying data hierarchy. Our algorithms provide efficient lookups while a...