Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.impl / src / org / simantics / db / impl / query / ReadEntry.java

diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ReadEntry.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ReadEntry.java
new file mode 100644 (file)
index 0000000..a9fc512
--- /dev/null
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ReadEntry.java
@@ -0,0 +1,166 @@
+/*******************************************************************************\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.impl.query;\r
+\r
+import org.simantics.db.AsyncReadGraph;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.impl.graph.ReadGraphImpl;\r
+import org.simantics.db.impl.graph.WriteGraphImpl;\r
+import org.simantics.db.procedure.AsyncProcedure;\r
+import org.simantics.db.request.Read;\r
+import org.simantics.db.request.ReadExt;\r
+import org.simantics.db.request.RequestFlags;\r
+\r
+final public class ReadEntry<T> extends CacheEntryBase {\r
+\r
+       protected Read<T> request;\r
+\r
+       public ReadEntry(Read<T> request) {\r
+       this.request = request;\r
+    }\r
+    \r
+    @Override\r
+    int makeHash() {\r
+       return request.hashCode();\r
+    }\r
+       \r
+    @Override\r
+    public Object getOriginalRequest() {\r
+        return request;\r
+    }\r
+    \r
+    @Override\r
+    public void discard() {\r
+       super.discard();\r
+       setResult(null);\r
+    }\r
+       \r
+    final public void addOrSet(AsyncReadGraph graph, Object item) {\r
+\r
+       assert(assertPending());\r
+       \r
+//        ArrayList<Pair<AsyncProcedure<T>, AsyncBarrier>> p = null;\r
+\r
+       synchronized(this) {\r
+           \r
+            setResult(item);\r
+               setReady();\r
+//             p = procs;\r
+//             procs = null;\r
+               \r
+       }\r
+\r
+//        if(p != null)\r
+//             for(Pair<AsyncProcedure<T>, AsyncBarrier> proc : p) {\r
+//                     proc.first.execute(graph, (T)item);\r
+//                     proc.second.dec();\r
+//             }\r
+        \r
+    }\r
+\r
+    @Override\r
+    final public Query getQuery() {\r
+        \r
+        return new Query() {\r
+\r
+                       @Override\r
+                       public void recompute(ReadGraphImpl graph_, Object provider, CacheEntry entry) {\r
+                               \r
+                               QueryProcessor qp = (QueryProcessor)provider;\r
+                               \r
+                       WriteGraphImpl write = qp.getCore().getSession().getService(WriteGraphImpl.class);\r
+                               \r
+                       ReadGraphImpl graph = write.newSync(entry);\r
+\r
+                               try {\r
+\r
+                                       entry.setPending();\r
+                                   T result = request.perform(graph);\r
+                                   addOrSet(graph, result);\r
+\r
+                               } catch (Throwable t) {\r
+\r
+                                       except(t);\r
+                    \r
+                }\r
+                               \r
+                       }\r
+\r
+                       @Override\r
+                       public void removeEntry(QueryProcessor processor) {\r
+                               processor.readMap.remove(request);\r
+                       }\r
+\r
+                       @Override\r
+                       public int type() {\r
+                               if(request instanceof ReadExt) {\r
+                                       return ((ReadExt)request).getType();\r
+                               } else {\r
+                                       return RequestFlags.INVALIDATE;\r
+                               }\r
+                       }\r
+                       \r
+                       @Override\r
+                       public String toString() {\r
+                               if(request == null) return "DISCARDED";\r
+                               else return request.toString() + statusOrException;\r
+                       }\r
+               \r
+        };\r
+        \r
+    }\r
+    \r
+       public void performFromCache(ReadGraphImpl graph, Object provider,      Object procedure) {\r
+           \r
+        AsyncProcedure<T> proc = (AsyncProcedure<T>)procedure;\r
+\r
+           if(isExcepted()) {\r
+\r
+            try {\r
+                proc.exception(graph, (Throwable)getResult());\r
+            } catch (Throwable t) {\r
+                t.printStackTrace();\r
+            }\r
+               \r
+           } else {\r
+               \r
+            try {\r
+                proc.execute(graph, (T)getResult());\r
+            } catch (Throwable t) {\r
+                t.printStackTrace();\r
+            }\r
+\r
+           }\r
+               \r
+       }\r
+       \r
+       @Override\r
+       public String toString() {\r
+               if(request == null) return "DISCARDED";\r
+               else return request.toString() + " - " + statusOrException;\r
+       }\r
+       \r
+       public Object get(ReadGraphImpl graph, QueryProcessor processor, Object procedure) throws DatabaseException {\r
+               if(procedure != null) performFromCache(graph, processor, procedure);\r
+               checkAndThrow();\r
+               return getResult();\r
+       }\r
+       \r
+       @Override\r
+       boolean isImmutable(ReadGraphImpl graph) throws DatabaseException {\r
+               if(request instanceof ReadExt) {\r
+                       return ((ReadExt)request).isImmutable(graph);\r
+               }\r
+               return false;\r
+       }\r
+\r
+}\r