X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.scl.db%2Fsrc%2Forg%2Fsimantics%2Fscl%2Fdb%2FSCLFunctions.java;h=8f535eb5a904bbf507db3423ce3cc4aa4ecd50e4;hb=94ed9b143bf341b804b8a14dc8b41458f6b6906e;hp=aae7a89a26da69df9dc3e40360729ec673b754ed;hpb=bb2fdfbd51d98e44950c3236a606e587842689e2;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.scl.db/src/org/simantics/scl/db/SCLFunctions.java b/bundles/org.simantics.scl.db/src/org/simantics/scl/db/SCLFunctions.java
index aae7a89a2..8f535eb5a 100644
--- a/bundles/org.simantics.scl.db/src/org/simantics/scl/db/SCLFunctions.java
+++ b/bundles/org.simantics.scl.db/src/org/simantics/scl/db/SCLFunctions.java
@@ -38,17 +38,21 @@ import org.simantics.scl.runtime.function.Function1;
 import org.simantics.scl.runtime.tuple.Tuple;
 import org.simantics.scl.runtime.tuple.Tuple0;
 import org.simantics.utils.DataContainer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 @SuppressWarnings({"rawtypes", "unchecked"})
 public class SCLFunctions {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(SCLFunctions.class);
+
     public static final String GRAPH = "graph";
 
     public static <T> T safeExec(final Function f) {
         try {
             return (T)f.apply(Tuple0.INSTANCE);
         } catch (Throwable t) {
-            t.printStackTrace();
+            LOGGER.error("safeExec caught exception", t);
             return null;
         }
     }
@@ -93,18 +97,22 @@ public class SCLFunctions {
     
     public static void asyncWrite(final Function f) throws DatabaseException {
         SCLContext context = SCLContext.createDerivedContext();
-        Simantics.getSession().asyncRequest(new WriteRequest() {
-            @Override
-            public void perform(WriteGraph graph) throws DatabaseException {
-                SCLContext.push(context);
-                context.put(GRAPH, graph);
-                try {
-                    f.apply(Tuple0.INSTANCE);
-                } finally {
-                    SCLContext.pop();
+        if (Simantics.peekSession() != null) {
+            Simantics.getSession().asyncRequest(new WriteRequest() {
+                @Override
+                public void perform(WriteGraph graph) throws DatabaseException {
+                    SCLContext.push(context);
+                    context.put(GRAPH, graph);
+                    try {
+                        f.apply(Tuple0.INSTANCE);
+                    } finally {
+                        SCLContext.pop();
+                    }
                 }
-            }
-        });
+            });
+        } else {
+            LOGGER.warn("No session available for asynchronous write requests");
+        }
     }
     
     public static <T> T syncWrite(final Function f) throws DatabaseException {