Hi, > I have two confused questions regarding Lucene implementation, hope > someone can give me some clues. > > 1. It's about the AttributeSource/AttributeSourceImpl implemenation. > Seems like the default instance was kept as "static" > in DefaultAttributeFactory. But we get these instances in analyzer directly. > In > this point of view, analyzer implementation is not thread safe, right? > Because each attributesourceimpl object will refer to same instance but > without synchronization.
This is not a problem. Analyzers are threadsafe; every TokenStream instance is used only in one thread. The DefaultAttributeFactory singleton is not a problem, as the instance is only used read-only and all members are final and the internal state of DefaultAttributeFactory instance does not change. The static cache inside DefaultAttributeFactory#getClassForInterface is thread safe, as it uses a concurrent map. The members of the map are Class<? extends AttributeImpl>; each AttributeImpl is created with newInstance() from the Class<? extends AttributeImpl> instance. Uwe --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
