-/*******************************************************************************\r
- * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
- * in Industry THTH ry.\r
- * All rights reserved. This program and the accompanying materials\r
- * are made available under the terms of the Eclipse Public License v1.0\r
- * which accompanies this distribution, and is available at\r
- * http://www.eclipse.org/legal/epl-v10.html\r
- *\r
- * Contributors:\r
- * VTT Technical Research Centre of Finland - initial API and implementation\r
- *******************************************************************************/\r
-package org.simantics.db.common.procedure.single.wrapper;\r
-\r
-import java.util.concurrent.atomic.AtomicBoolean;\r
-\r
-import org.simantics.db.AsyncReadGraph;\r
-import org.simantics.db.common.procedure.adapter.AsyncMultiProcedureAdapter;\r
-import org.simantics.db.exception.ManyObjectsForFunctionalRelationException;\r
-import org.simantics.db.procedure.AsyncProcedure;\r
-\r
-final public class SingleFunctionalOrNullProcedure<Result> extends AsyncMultiProcedureAdapter<Result> {\r
- \r
- final String location;\r
- final AsyncProcedure<Result> procedure;\r
- final AtomicBoolean found = new AtomicBoolean(false);\r
- final AtomicBoolean guard = new AtomicBoolean(false);\r
- final AtomicBoolean exception = new AtomicBoolean(false);\r
- \r
- public SingleFunctionalOrNullProcedure(String location, AsyncProcedure<Result> procedure) {\r
- \r
- this.location = location;\r
- this.procedure = procedure;\r
- \r
- }\r
- \r
- @Override\r
- public void execute(AsyncReadGraph graph, Result result) {\r
- \r
- assert(!guard.get());\r
-\r
- if(found.compareAndSet(false, true)) {\r
- procedure.execute(graph, result);\r
- } else {\r
- if(exception.compareAndSet(false, true)) {\r
- procedure.exception(graph, new ManyObjectsForFunctionalRelationException(location + " -> " + procedure));\r
- }\r
- }\r
- \r
- }\r
- \r
- @Override\r
- public void finished(AsyncReadGraph graph) {\r
-\r
- assert(!guard.get());\r
- \r
- guard.set(true);\r
- \r
- if(found.compareAndSet(false, true)) {\r
- procedure.execute(graph, null);\r
- }\r
- \r
- }\r
- \r
- @Override\r
- public void exception(AsyncReadGraph graph, Throwable t) {\r
- \r
- procedure.exception(graph, t);\r
- \r
- }\r
- \r
- @Override\r
- public String toString() {\r
- return "SingleFunctionalOrNullProcedure -> " + procedure;\r
- }\r
-\r
-}\r
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.common.procedure.single.wrapper;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.simantics.db.AsyncReadGraph;
+import org.simantics.db.common.procedure.adapter.AsyncMultiProcedureAdapter;
+import org.simantics.db.exception.ManyObjectsForFunctionalRelationException;
+import org.simantics.db.procedure.AsyncProcedure;
+
+final public class SingleFunctionalOrNullProcedure<Result> extends AsyncMultiProcedureAdapter<Result> {
+
+ final String location;
+ final AsyncProcedure<Result> procedure;
+ final AtomicBoolean found = new AtomicBoolean(false);
+ final AtomicBoolean guard = new AtomicBoolean(false);
+ final AtomicBoolean exception = new AtomicBoolean(false);
+
+ public SingleFunctionalOrNullProcedure(String location, AsyncProcedure<Result> procedure) {
+
+ this.location = location;
+ this.procedure = procedure;
+
+ }
+
+ @Override
+ public void execute(AsyncReadGraph graph, Result result) {
+
+ assert(!guard.get());
+
+ if(found.compareAndSet(false, true)) {
+ procedure.execute(graph, result);
+ } else {
+ if(exception.compareAndSet(false, true)) {
+ procedure.exception(graph, new ManyObjectsForFunctionalRelationException(location + " -> " + procedure));
+ }
+ }
+
+ }
+
+ @Override
+ public void finished(AsyncReadGraph graph) {
+
+ assert(!guard.get());
+
+ guard.set(true);
+
+ if(found.compareAndSet(false, true)) {
+ procedure.execute(graph, null);
+ }
+
+ }
+
+ @Override
+ public void exception(AsyncReadGraph graph, Throwable t) {
+
+ procedure.exception(graph, t);
+
+ }
+
+ @Override
+ public String toString() {
+ return "SingleFunctionalOrNullProcedure -> " + procedure;
+ }
+
+}