October 2017
Intermediate to advanced
442 pages
12h 33m
English
Content preview from Architecting Modern Java EE Applications
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Scopes
Bean scopes are quite important for the cases when state is kept in the application for longer than the duration of a single request.
If the whole business process can be implemented in a stateless way, by just executing some logic and discarding all state afterwards, scope definitions are pretty straightforward. Stateless session beans with dependent scoped CDI beans already fulfill a lot of these cases.
The EJB singleton scope and the CDI application scope, respectively, are used quite frequently as well. Single instances of a bean type are a straightforward way to store or cache information that have a long lifespan. Besides all the sophisticated caching technology, a singleton containing simple collections or maps with managed ...
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