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A Framework for Building MAS Framework • An Agent-Based Infrastructure for building multiagent (mobile or not) systems. • Some agent-based frameworks – – – – – Impact Retsina Jade Aglet YinYang Characteristics • • • • • • Design Autonomy Communication Infrastructure Directory Service Message Protocol Mediation Services Security Services YinYang System • • • • • • • To create an agent society Make it easy to build MA systems Agents can be static, private or mobile Execute asynchronously & autonomously Online and Scalable Use Java and Jini Technology Use KQML as Agent Communication Language YinYang Architecture D1 P1 P3 D3 D2 P2 P4 YinYang Architecture • YinYang system is an agent society that consists of several agent organizations. • Every agent organization contains – A Manager – One or several Domains that connect to that Manager – Each domain contains one or several agents Agent Organization D1 x D2 Domain Domain Manager Domain D3 Run Agents • You stay at Domain D1 • An Agent x is located at Domain D2 • You can run x – At D2 and get result at D1 – At D3 and get result at D1 – At D1 and get the result Launch an Agent • You can launch an agent (your own or from another domain) and let everyone run it at your domain. • You can clone an active agent at your domain • You can move an active agent from your domain to another domain. Agent Communication • Agents Communicate by using KQML • Communication can be – Synchronous or – Asynchronous • Agents can keep several messages in ”inbox” message and handle them automatically. JDBC • JDBC creates an interface beween applications and Database • Database – Mysql – Cloudscape – Access ODBC-Access Database • Make an empty Access Database • Start an ODBC driver – Control Panel->ODBC->Add->*.mdb • Edit a sql file: book.sql • Make an application: CreateTable.java • Run program – Java PerformSql book book.sql Jdbc Program • Load database driver Class.forName(driver); • Set up connection to database Connection con = DriverManager.getConnection • Prepare a Sql Statement Statement s = Con.createStatement • Execute the Sql Statement s.executeUpdate(”…”);
