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Performance and Scalability of EJB Applications

Performance and Scalability of EJB Applications. Emmanuel Cecchet et al. Problem Addressed. Performance Scalability of J2EE application servers. Test effect of: Application Implementation Methods Container Design Communication Layer Persistence Management

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Performance and Scalability of EJB Applications

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  1. Performance and Scalability of EJB Applications Emmanuel Cecchet et al

  2. Problem Addressed • Performance Scalability of J2EE application servers. • Test effect of: • Application Implementation Methods • Container Design • Communication Layer • Persistence Management • Using an ebay like auction site server benchmark.

  3. What are J2EE and EJB ? • J2EE • Java 2 Platform Enterprise Edition • Java API’s to build dynamic content web sites. • Scalable run-time infrastructure to host. • EJB • Enterprise JavaBeans • Managed server-side component architecture for modular construction of enterprise applications. • Encapsulates the business logic of the application. • Specifically for multi-tier client/server systems. • Containers are responsible for providing: • Component pooling and lifecycle management • Client session management • Database connection pooling • Persistence • Transaction management • Authentication and access control.

  4. Figure 1. Enterprise Java Beans in the J2EE framework. Apache; Tomcat; JBoss,JOnAS; MySQL

  5. Persistence Management • Bean developer decides to manage persistence by: • Bean-Managed Persistence (BMP) • SQL is embedded in bean code. • Only database connection pooling and transaction management services of the container are used. • Container-Managed Persistence (CMP) • A deployment descriptor contains a one-to-one mapping between bean instance variables and database columns. • The container uses the descriptor to generate the necessary SQL statements and ensure concurrency control in the database.

  6. Communication Layers • Test both with and without optimizations.

  7. Types of Persistence • Entity beans that map data stored in the database. • (usually one entity bean instance per database table row) • Session beans that are used to: • Perform temporary operations (stateless session beans). • Represent temporary objects (stateful session beans).

  8. EJB Container Design (2) • Dynamic Proxy approach ( Jboss ). • Container Classes are generated at run time making extensive use of reflection. • Pre-Compilation ( JOnAS and most commercial implementations ). • Classes are generated during deployment reducing run time reflection.

  9. Application Implementations (5) • Java servlets-only (for comparison) • EJB • Stateless Session Beans • Entity Beans • Container-managed persistence • Bean-managed persistence • Session Façade beans • EJB 2.0 Local Interfaces(entity beans with only local interfaces and session beans with remote interfaces)

  10. Figure 2. Servlets-only to session bean implementation.

  11. Figure 3. DAO separation with Entity Beans. CMP & BMP

  12. Figure 4. Session façade design pattern. Session Façade & EJB 2.0 local interfaces

  13. Implementation Complexity

  14. Overall Results

  15. Communication Optimizations

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