Saturday, August 14, 2010

About Mobile Agent

The below in this post is my choose from (world wide web) about Aglet and Java mobile Agent to help the reader to understand the further posts and the reference is in the tail of the current post

What is the Mobile Agent

In computer science, a mobile agent is a composition of computer software and data which is able to migrate (move) from one computer to another autonomously and continue its execution on the destination computer.

Definition and overview

A Mobile Agent, namely, is a type of software agent, with the feature of autonomy, social ability, learning, and most importantly, mobility.
More specifically, a mobile agent is a process that can transport its state from one environment to another, with its data intact, and be capable of performing appropriately in the new environment. Mobile agents decide when and where to move. Movement is often evolved from RPC methods. Just as a user directs an Internet browser to "visit" a website (the browser merely downloads a copy of the site or one version of it in the case of dynamic web sites), similarly, a mobile agent accomplishes a move through data duplication. When a mobile agent decides to move, it saves its own state, transports this saved state to the new host, and resumes execution from the saved state.
A mobile agent is a specific form of mobile code. However, in contrast to the Remote evaluation and Code on demand programming paradigms, mobile agents are active in that they can choose to migrate between computers at any time during their execution. This makes them a powerful tool for implementing distributed applications in a computer network.
An open multi-agent systems (MAS) is a system in which agents, that are owned by a variety of stakeholders, continuously enter and leave the system.

Reputation and Trust

The following are general concerns about Trust and Reputation in Mobile Agent research:
  1. Source of trust information
    • Direct experience
    • Witness information
    • Role-based rules
    • Third-party references
  2. How trust value is calculated
  3. Overall trust value

What are the differences between trust and reputation systems?

Trust systems produce a score that reflects the relying party’s subjective view of an entity’s trustworthiness, whereas reputation systems produce an entity’s (public) reputation score as seen by the whole community.


Some advantages which mobile agents have over conventional agents:
* Computation bundles - converts computational client/server round trips to relocatable data bundles, reducing network load.
* Parallel processing -asynchronous execution on multiple heterogeneous network hosts
* Dynamic adaptation - actions are dependent on the state of the host environment
* Tolerant to network faults - able to operate without an active connection between client and server
* Flexible maintenance - to change an agent's actions, only the source (rather than the computation hosts) must be updated
One particular advantage for remote deployment of software includes increased portability thereby making system requirements less influential.

What is Aglet

Aglets is a Java based mobile agent platform and library for building mobile agents based applications. An aglet is a Java agent which can autonomously and spontaneously move from one host to another carrying a piece of code with it. It can be programmed to execute at a remote host and show different behaviours at different hosts. Java based security implementations take care of authorised access to local resources at the remote hosts.
Aglets was originally developed by Mitsuru Oshima ("大島 満") and Danny Lange at the IBM Tokyo Research Laboratory. The original name of the project was AWB (Aglets WorkBench) and IBM was responsible for most of the 1.x release. However the project is now hosted at as an open source project, where it is distributed under the IBM Public License. In the beginning, the SourceForge releases had been only bug-fix ones, but 2.x series(most of which came from open source community only) had better security and thread management. It now includes a log4j based logging system and a few bug-fixes of the older versions.
Aglets is completely written in Java, thus allowing a high portability of both the agents and the platform. Aglets includes both a complete Java mobile agent platform, with a stand-alone server called Tahiti, and a library that allows developers to build mobile agents and to embed the Aglets technology in their applications.
No new releases of Aglets have been made since 2001, although an updated users manual was released in 2004. The future of the project is unclear.
The Aglets Software Development Kit (ASDK) is a framework and environment for developing and running mobile agents. Mobile Agents are a type of software agents that have the unique ability to transport themselves from one system to another. Doing so, an

Tools to develop Mobile Agent

The Aglets Software Development Kit (ASDK) is a framework and environment for developing and running mobile agents. Mobile Agents are a type of software agents that have the unique ability to transport themselves from one system to another. Doing so, an
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