svn commit: r1163829 - /incubator/jena/Jena2/ARQ/trunk/src/com/hp/hpl/jena/sparql/core/DatasetImpl.java

[an...@apache.org]

Author: andy
Date: Wed Aug 31 21:30:36 2011
New Revision: 1163829

URL: http://svn.apache.org/viewvc?rev=1163829&view=rev
Log:
Lock on private object.

Modified:
    incubator/jena/Jena2/ARQ/trunk/src/com/hp/hpl/jena/sparql/core/DatasetImpl.java

Modified: incubator/jena/Jena2/ARQ/trunk/src/com/hp/hpl/jena/sparql/core/DatasetImpl.java
URL: http://svn.apache.org/viewvc/incubator/jena/Jena2/ARQ/trunk/src/com/hp/hpl/jena/sparql/core/DatasetImpl.java?rev=1163829&r1=1163828&r2=1163829&view=diff
==============================================================================
--- incubator/jena/Jena2/ARQ/trunk/src/com/hp/hpl/jena/sparql/core/DatasetImpl.java (original)
+++ incubator/jena/Jena2/ARQ/trunk/src/com/hp/hpl/jena/sparql/core/DatasetImpl.java Wed Aug 31 21:30:36 2011
@@ -26,6 +26,7 @@ import com.hp.hpl.jena.sparql.util.NodeU
 public class DatasetImpl implements Dataset
 {
     protected DatasetGraph dsg = null ;
+    private Object lock = new Object() ;
     
     // A small cache so that calls getDefaultModel()/getNamedModel() are
     // cheap when used repeatedly in code.  This is not an excuse for
@@ -48,7 +49,7 @@ public class DatasetImpl implements Data
     /** Return the default model */
     public Model getDefaultModel() 
     { 
-        synchronized(this)
+        synchronized(lock)
         {
             if ( defaultModel == null )
                 defaultModel = graph2model(dsg.getDefaultGraph()) ;
@@ -66,7 +67,7 @@ public class DatasetImpl implements Data
         checkGraphName(uri) ;
         
         // synchronized because we need to read and possible update the cache atomically 
-        synchronized(this)
+        synchronized(lock)
         {
             Model m = cache.get(uri) ;
             if ( m == null )