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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-85) Consider removing metadata synchronization
Date Thu, 21 Mar 2013 15:09:16 GMT
Martin Desruisseaux created SIS-85:
--------------------------------------

             Summary: Consider removing metadata synchronization
                 Key: SIS-85
                 URL: https://issues.apache.org/jira/browse/SIS-85
             Project: Spatial Information Systems
          Issue Type: Improvement
          Components: Metadata
            Reporter: Martin Desruisseaux
             Fix For: 0.3


All subclasses of {{ISOMetadata}} are currently synchronized. It probably doesn't have significant
impact on the JAR file size, since (in my understanding) adding a {{synchronized}} keyword
in the method signature just set a bit in a bitmask. However it may be a cause of thread contention.

Synchronization may not be necessary since the typical usage of metadata objects is:

* Create the metadata object once in a single thread.
* Declare the metadata as unmodifiable.
* Allow any thread to read (but not set) the metadata properties.

The potential contention, especially on metadata object shared by many other objects, would
be unfortunate. However profiling this not show significant bottleneck yet.


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