LUCENE-623: RAMDirectory.close() now nulls out it's 'file' references

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@419723 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -87,7 +87,9 @@ Optimizations
      indexes.  This will improve the performance of many types of queries
      against a non-optimized index. (Andrew Hudson via Yonik Seeley)
 
-
+  2. LUCENE-623: RAMDirectory.close now nulls out it's reference to all
+     internal "files", allowing them to be GCed even if references to the
+     RAMDirectory itself still exist. (Nadav Har'El via Chris Hostetter)
 
 Release 2.0.0 2006-05-26
 

src/java/org/apache/lucene/store/RAMDirectory.java

@@ -198,7 +198,8 @@ public final class RAMDirectory extends Directory implements Serializable {
     };
   }
 
-  /** Closes the store to future operations. */
+  /** Closes the store to future operations, releasing associated memory. */
   public final void close() {
+    files = null;
   }
 }

src/test/org/apache/lucene/index/TestIndexWriterMerging.java

@@ -61,9 +61,9 @@ public class TestIndexWriterMerging extends TestCase
 
     writer.addIndexes(new Directory[]{indexA, indexB});
     writer.close();
-    merged.close();
 
     fail = verifyIndex(merged, 0);
+    merged.close();
 
     assertFalse("The merged index is invalid", fail);
   }