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Distributed Refreshable Objects (DRO) 3.1 is a software library for Java developers enhancing
inter-object communication in local as well as distributed environments, which can be considered
as more effective and flexible alternative to CORBA and other distributed-object infrastructures.
The corner stone of the library is the concept of refreshable object. A refreshable object provides
change tracking for object properties, proper as well as calculated from other objects' properties,
and it provides caching resource-intensive calculated properties without stale data.
All this is done transparently for programmers.
This library allows for class
providers to avoid programming of object property change notification; it is a
ready-to-use mechanism being tuned up with
annotations
on classes and methods. Class users are able to track changes of any
object properties by means of callbacks.
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The main thing is that object properties
can be cached in declarative manner by adding the annotation @Cached on its getters,
which results in flexible optimization of performance with no interference
with the application code.
The proposed architectural pattern "refreshable caching" is an alternative to
the pattern
"publish/subscribe"
and an addition to
the
architectural pattern MVC (Model-View-Controller).
Features of the approach let reduce programmers' efforts in programming
complex object interaction and object property caching noticeably.
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DRO helps solve the following problems:
Tuning efficiency of distributed application code Maintaining the viability of applications in the face of change The obsolescence of cached data Central server bottleneck (peer-to-peer connection is used instead)
The key features are:
Effective network data interchange Caching resource-intensive calculated properties without stale data Change tracking for object properties No any messaging server needed Wide possibility to optimize network traffic À bunch of iterator elements is transmitted at a time Informative network packets debugging
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Manual DRO 3: distributed_refreshable_objects_tutorial_eng.pdf 276 kb
Old versions of Java Refreshable Objects
Java Refreshable Objects v2.0
Restrictions: version 2.0 has no access to distributed environment
Manual RO 2.0: refreshable_objects_tutorial_eng.pdf 222 kb
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