+/*******************************************************************************\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