Contents The EJB Timer Service 394 Timer Service (Php5 web hosting)
Contents The EJB Timer Service 394 Timer Service API 395 Interaction between the EJB and the Timer Service 398 Timer Example: CleanDayLimitOrdersEJB 399 The CleanDayLimitOrders EJB Remote Interface 400 The CleanDayLimitOrders EJB Bean Class 400 The CleanDayLimitOrders EJB Home Interface 403 The CleanDayLimitOrders EJB Deployment Descriptor 403 The CleanDayLimitOrders EJB Client 404 Running the Client 405 Strengths and Limitations of EJB Timer Service 406 Summary 408 Chapter 15 BMP and CMP Relationships 409 The CMP and BMP Difference 410 Cardinality 411 1:1 Relationships 412 1:N Relationships 416 M:N Relationships 421 Directionality 428 Implementing Directionality with BMP 429 Implementing Directionality with CMP 430 Directionality May Not Map to Database Schemas 431 Bidirectional or Unidirectional? 433 Lazy Loading 433 Aggregation Versus Composition and Cascading Deletes 434 Relationships and EJB-QL 436 Recursive Relationships 437 Circular Relationships 438 Referential Integrity 439 Relationships, Referential Integrity, and Client Code 441 Summary 444 Chapter 16 Persistence Best Practices 445 Comparing Entity Beans with Other Persistence Approaches 446 Control 446 Data retrieval 446 Procedural versus Object-Oriented 447 Caching 448 Enforcement of Schema Independence 448 Migration 449 Rapid Application Development 449 Choosing Between CMP and BMP 450 Code Reduction and Rapid Application Development 450 Performance 450 Bugs 451 Control 451 Application Server and Database Independence 451 Relationships 452 Learning Curve and Cost 452
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