Hi folks,
Sorry for cross-posting, I'm unsure which forum is the right choise to
address this
I'm wondering about the current behavior adding features programatically to
a layer. The layer has a MemoryGeoResourceImpl internally which uses
MemoryDataStore (geotools 11.2 & uDig 2.0.0-SNAPSHOT).
I expected to get features stored to DataStore while uDig is (still)
rendering features already added. But the during rendering
ConcurrentModificatinExtepion's are thrown while writing new features or
modifying exiting.
!ENTRY org.locationtech.udig.project 2 0 2015-09-07 16:06:32.517
!MESSAGE class java.util.ConcurrentModificationException occured during
rendering: null
!STACK 0
org.locationtech.udig.project.render.RenderException: class
java.util.ConcurrentModificationException occured during rendering: null
at
org.locationtech.udig.render.internal.feature.basic.BasicFeatureRenderer.render(BasicFeatureRenderer.java:489)
at
org.locationtech.udig.render.internal.feature.basic.BasicFeatureRenderer.render(BasicFeatureRenderer.java:320)
at
org.locationtech.udig.project.internal.render.impl.RenderJob.startRendering(RenderJob.java:117)
at
org.locationtech.udig.project.internal.render.impl.RenderJob.run(RenderJob.java:222)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.util.ConcurrentModificationException
at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(Unknown Source)
at java.util.LinkedHashMap$ValueIterator.next(Unknown Source)
at
org.geotools.data.memory.MemoryDataStore.getBounds(MemoryDataStore.java:609)
at
org.geotools.data.AbstractFeatureSource.getBounds(AbstractFeatureSource.java:318)
at
org.geotools.data.AbstractFeatureSource.getBounds(AbstractFeatureSource.java:286)
at
org.locationtech.udig.catalog.memory.internal.MemoryGeoResourceImpl$ScratchResourceInfo.getBounds(MemoryGeoResourceImpl.java:167)
at
org.locationtech.udig.project.internal.impl.GeoResourceInfoInterceptor$Wrapper.getBounds(GeoResourceInfoInterceptor.java:63)
at
org.locationtech.udig.project.internal.impl.LayerImpl.obtainBoundsFromResources(LayerImpl.java:2173)
at
org.locationtech.udig.project.internal.impl.LayerImpl.getBounds(LayerImpl.java:2144)
at
org.locationtech.udig.render.internal.feature.basic.BasicFeatureRenderer.validateBounds(BasicFeatureRenderer.java:567)
at
org.locationtech.udig.render.internal.feature.basic.BasicFeatureRenderer.render(BasicFeatureRenderer.java:363)
... 4 more
>From a "user" perspective its quite hard to synchchronize access to the
datastore while there are different extensions accessing the layer
(getBounds, Iterator for Renderer, etc.) and its resources from uDig. I
remember a discussion a few years ago about the same problem but cannot
find the thread anymore.
Q: What's the best aproach to write features to MemoryDataStore while other
having read-access in between? Would it be a good approach using a
ConcurrentHashMap internally or using a different DataStore (e.g. h2)?
Thanks in advance
-- Frank
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