August 2013
Intermediate to advanced
362 pages
8h 40m
English
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Chapter 10. Concurrency Utilities
Concurrency Utilities for Java EE are defined as JSR 236, and the complete specification can be downloaded.
Concurrency Utilities for Java EE provides a simple, standardized API for using concurrency from application components without compromising container integrity while still preserving the Java EE platform’s fundamental benefits.
Java EE containers such as the EJB or web container do not allow using
common Java SE concurrency APIs such as
java.util.concurrent.ThreadPoolExecutor,
java.lang.Thread, or java.util.Timer directly.
This is because all application code is run on a thread managed by the
container, and each container typically expects all access to
container-supplied objects to occur on the same thread. This allows the
container to manage the resources and provide centralized administration.
Further, using resources in a nonmanaged way is discouraged, because it can
potentially undermine the enterprise features that the platform is designed
to provide, such as availability, security, reliability, and
scalability.
This API extends the Concurrency Utilities API developed under
JSR-166y and found in Java 2 Platform,
Standard Edition 7 (Java SE 7) in the
java.util.concurrent package. Application developers familiar
with this API can leverage existing libraries and usage patterns with little
modification. This will allow you to add concurrency design principles to
existing Java EE applications using existing design patterns.
Asynchronous Tasks ...
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