RAMDirectory Not Correctly Serilizing
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Key: LUCENENET-174
URL: https://issues.apache.org/jira/browse/LUCENENET-174
Project: Lucene.Net
Issue Type: Bug
Environment: Lucene.Net version 2.1
Windows XP 64Bit SP2
Visual Studio 2008 SP1
DOTNET 3.5 SP1
NCache Developer 3.4
Reporter: Philip Todd
Priority: Minor
Greetings. Firstly a big thank you for everyones efforts with Lucene and
Lucene.Net. Your efforts are much appreciated.
Background:
I have created a server application which allows searching across many
companies. In order to achieve this I have utilized Lucene.Net for indexing and
searching and NCache from Alachisoft for caching the information server-side.
As the Lucene index takes a fair amount of time to create - I am also caching
the RAMDirectory. The caching requires all objects to be serialized before
storage.
The issue:
After retrieving the RAMDirectory from cache (after de-serializing) I attempted
to create a new IndexWriter object to allow adding more items to the index:
oDirectory = CacheConfig.DeCacheSupplierIndex("SupplierIndex" &
Supplier.BuyerNo)
analyzer = New StandardAnalyzer()
oIndexWriter = New IndexWriter(oDirectory, analyzer, False)
The attempt to create the IndexWriter resulted in a NullReference exception at:
at Lucene.Net.Store.Directory.MakeLock(String name)
at Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a,
Boolean create, Boolean closeDir)
at Lucene.Net.Index.IndexWriter..ctor(Directory d, Analyzer a)
After debugging the Lucene source I discovered the exception was caused by the
lockFactory definition in the Directory class (Directory.cs line 49) having a
[NonSerialized] attribute. This caused the lockFactory to be null after
serialization.
Fix:
Removed the [NonSerialized] attribute.
Added a [Serializable] attribute to SingleInstanceLockFactory
(SingleInstanceLockFactory.cs line 35)
Added a [Serializable] attribute to LockFactory (LockFactory.cs line 28)
This allowed me to proceed. I have not thoroughly tested the changes. I can
provide the source code if required.
As we will very likely upgrade to future versions of Lucene - I would like to
have any fix incorporated into the Lucene source repository. Let me know what I
should do.
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