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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SIS-349) Dead-lock between ContextualParameters and WeakHashSet
Date Thu, 09 Feb 2017 06:11:42 GMT

     [ https://issues.apache.org/jira/browse/SIS-349?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Desruisseaux resolved SIS-349.
-------------------------------------
    Resolution: Fixed

> Dead-lock between ContextualParameters and WeakHashSet
> ------------------------------------------------------
>
>                 Key: SIS-349
>                 URL: https://issues.apache.org/jira/browse/SIS-349
>             Project: Spatial Information Systems
>          Issue Type: Bug
>          Components: Referencing
>    Affects Versions: 0.6, 0.7
>            Reporter: Johann Sorel
>            Assignee: Martin Desruisseaux
>             Fix For: 0.8
>
>
> Below are thread-dump of relevant parts. The first parts is in the thread that verifies
if an existing map projection exists in the {{WeakHashSet}}. This verification implies {{NormalizedProjection}}
comparisons, which themselves imply {{ContextualParameters}} comparisons:
> {noformat}
> "Thread-3407" #3588 daemon prio=5 os_prio=0 tid=0x00007f7951adf000 nid=0x5836 waiting
for monitor entry [0x00007f78744ef000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
>     at org.apache.sis.referencing.operation.transform.ContextualParameters.equals(ContextualParameters.java:720)
>     - waiting to lock <0x00000007818ef028> (a org.apache.sis.referencing.operation.transform.ContextualParameters)
>     at java.util.Arrays.deepEquals0(Arrays.java:4299)
>     at java.util.Objects.deepEquals(Objects.java:85)
>     at org.apache.sis.util.Utilities.deepEquals(Utilities.java:200)
>     at org.apache.sis.referencing.operation.transform.AbstractMathTransform.equals(AbstractMathTransform.java:921)
>     at org.apache.sis.referencing.operation.projection.NormalizedProjection.equals(NormalizedProjection.java:797)
>     at org.apache.sis.util.Utilities.deepEquals(Utilities.java:143)
>     at org.apache.sis.util.Utilities.equals(Utilities.java:238)
>     at org.apache.sis.util.Utilities.deepEquals(Utilities.java:168)
>     at org.apache.sis.referencing.operation.transform.ConcatenatedTransform.equals(ConcatenatedTransform.java:934)
>     at org.apache.sis.referencing.operation.transform.AbstractMathTransform.equals(AbstractMathTransform.java:867)
>     at org.apache.sis.util.collection.WeakHashSet.intern(WeakHashSet.java:315)
>     at org.apache.sis.util.collection.WeakHashSet.unique(WeakHashSet.java:290)
>     - locked <0x0000000704b65b40> (a org.apache.sis.util.collection.WeakHashSet)
>     at org.apache.sis.referencing.operation.transform.DefaultMathTransformFactory.unique(DefaultMathTransformFactory.java:1372)
> {noformat}
> The second part is in the thread that creates a new map projection, which implies operations
on {{ContextualParameters}}.
> {noformat}
> "Thread-3409" #3590 daemon prio=5 os_prio=0 tid=0x00007f7824cfd000 nid=0x5838 waiting
for monitor entry [0x00007f7819e6e000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
>     at org.apache.sis.util.collection.WeakHashSet.unique(WeakHashSet.java:290)
>     - waiting to lock <0x0000000704b65b40> (a org.apache.sis.util.collection.WeakHashSet)
>     at org.apache.sis.referencing.operation.transform.DefaultMathTransformFactory.unique(DefaultMathTransformFactory.java:1372)
>     at org.apache.sis.referencing.operation.transform.DefaultMathTransformFactory.createConcatenatedTransform(DefaultMathTransformFactory.java:1256)
>     at org.apache.sis.referencing.operation.transform.ContextualParameters.completeTransform(ContextualParameters.java:522)
>     - locked <0x00000007818ef028> (a org.apache.sis.referencing.operation.transform.ContextualParameters)
>     at org.apache.sis.referencing.operation.projection.TransverseMercator.createMapProjection(TransverseMercator.java:301)
>     at org.apache.sis.internal.referencing.provider.MapProjection.createMathTransform(MapProjection.java:199)
> {noformat}



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