Hosting web - Introduction to Entity Beans 127 This ejbLoad()-business method-ejbStore()
Introduction to Entity Beans 127 This ejbLoad()-business method-ejbStore() cycle may be repeated many times. EJB Container/Server Entity Bean Instance 3: Business Methods 1: ejbLoad() 4: ejbStore() 2: Read from 5: Write to Database Database Database Entity Bean Data Figure 6.3 Loading and storing an entity bean. Several Entity Bean Instances May Represent the Same Underlying Data Let s consider the scenario in which many threads of execution want to access the same database data simultaneously. In banking, interest might be applied to a bank account, while at the same time a company directly deposits a check into that same account. In e-commerce, many different client browsers may be simultaneously interacting with a catalog of products. To facilitate many clients accessing the same data, we need to design a high- performance access system to our entity beans. One possibility is to allow many clients to share the same entity bean instance; that way, an entity bean could service many client requests simultaneously. While this is an interesting
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