Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/AsyncReadEntry.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/AsyncReadEntry.java
new file mode 100644 (file)
index 0000000..6f68105
--- /dev/null
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/AsyncReadEntry.java
@@ -0,0 +1,181 @@
+/*******************************************************************************\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 java.util.ArrayList;\r
+\r
+import org.simantics.db.AsyncReadGraph;\r
+import org.simantics.db.impl.DebugPolicy;\r
+import org.simantics.db.impl.graph.ReadGraphImpl;\r
+import org.simantics.db.procedure.AsyncProcedure;\r
+import org.simantics.db.request.AsyncRead;\r
+\r
+final public class AsyncReadEntry<T> extends CacheEntryBase {\r
+\r
+    protected AsyncRead<T> request;\r
+\r
+    public AsyncReadEntry(AsyncRead<T> request) {\r
+       this.request = request;\r
+       if(DebugPolicy.QUERY_STATE) System.out.println("[QUERY STATE]: created " + this);\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
+       //request = null;\r
+       setResult(null);\r
+    }\r
+    \r
+    final public void addOrSet(AsyncReadGraph graph, Object item) {\r
+\r
+       assert(isPending());\r
+        \r
+//        ArrayList<AsyncProcedure<T>> 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(AsyncProcedure<T> proc : p) {\r
+//             proc.execute(graph, (T)item);\r
+////                proc.first.execute(graph, (T)item);\r
+////                proc.second.dec();\r
+//            }\r
+        \r
+    }\r
+    \r
+    \r
+    public void except(AsyncReadGraph graph, Throwable t) {\r
+       \r
+       assert(isPending());\r
+        \r
+//        ArrayList<AsyncProcedure<T>> p = null;\r
+\r
+        synchronized(this) {\r
+               \r
+            except(t);\r
+////            p = procs;\r
+//            procs = null;\r
+            \r
+        }\r
+\r
+//        if(p != null)\r
+//            for(AsyncProcedure<T> proc : p) {\r
+//             proc.exception(graph, t);\r
+//            }\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
+                               final ReadGraphImpl parentGraph = ReadGraphImpl.forRecompute(entry, qp); \r
+\r
+                               try {\r
+\r
+                                   request.perform(parentGraph , new AsyncProcedure<T>() {\r
+\r
+                        @Override\r
+                        public void execute(AsyncReadGraph graph, T result) {\r
+                            addOrSet(graph, result);\r
+                        }\r
+                               \r
+                               @Override\r
+                               public void exception(AsyncReadGraph graph, Throwable t) {\r
+                                   except(t);\r
+                        }\r
+\r
+                    });\r
+\r
+                               } catch (Throwable t) {\r
+                                   except(t);\r
+                }\r
+                               \r
+                       }\r
+\r
+                       @Override\r
+                       public void removeEntry(QueryProcessor qp) {\r
+                       qp.asyncReadMap.remove(request);\r
+                       }\r
+\r
+                       @Override\r
+                       public int type() {\r
+                               return request.getFlags();\r
+                       }\r
+                       \r
+                       @Override\r
+                       public String toString() {\r
+                               if(request == null) return "DISCARDED";\r
+                               else if(isExcepted()) return request.toString() + " " + getResult();\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(isDiscarded()) return "DISCARDED " + request.toString();\r
+               else if(isExcepted()) return request.toString() + " " + getResult();\r
+               else return request.toString() + " " + statusOrException;\r
+       }\r
+\r
+}\r