bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/AsyncMultiReadEntry.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.db.impl.query;\r
  13 \r
  14 import java.util.ArrayList;\r
  15 \r
  16 import org.simantics.db.AsyncReadGraph;\r
  17 import org.simantics.db.common.exception.DebugException;\r
  18 import org.simantics.db.impl.graph.ReadGraphImpl;\r
  19 import org.simantics.db.procedure.AsyncMultiProcedure;\r
  20 import org.simantics.db.request.AsyncMultiRead;\r
  21 import org.simantics.db.request.RequestFlags;\r
  22 \r
  23 final public class AsyncMultiReadEntry<T> extends CacheEntryBase {\r
  24 \r
  25 //    public ArrayList<AsyncMultiProcedure<T>> procs = null;\r
  26 \r
  27     protected AsyncMultiRead<T> request;\r
  28     \r
  29     public AsyncMultiReadEntry(AsyncMultiRead<T> request) {\r
  30         this.request = request;\r
  31     }\r
  32     \r
  33     @Override\r
  34     int makeHash() {\r
  35         return request.hashCode();\r
  36     }\r
  37     \r
  38     @Override\r
  39     public Object getOriginalRequest() {\r
  40         return request;\r
  41     }\r
  42     \r
  43     @Override\r
  44     public void discard() {\r
  45         super.discard();\r
  46         request = null;\r
  47         setResult(null);\r
  48     }\r
  49     \r
  50     final synchronized public void finish(AsyncReadGraph graph) {\r
  51         \r
  52 //      new Exception("finish " + this).printStackTrace();\r
  53         \r
  54         if(!isPending()) {\r
  55                 System.err.println("aff");\r
  56         }\r
  57         \r
  58         assert(isPending());\r
  59 \r
  60 //        ArrayList<AsyncMultiProcedure<T>> p = null;\r
  61 \r
  62         synchronized(this) {\r
  63 \r
  64                 setReady();\r
  65 //            p = procs;\r
  66 //            procs = null; \r
  67         \r
  68         }\r
  69         \r
  70 //        if(p != null) {\r
  71 //              ArrayList<T> v = (ArrayList<T>)getResult();\r
  72 //              if(v != null) {\r
  73 //                  for(AsyncMultiProcedure<T> proc : p) {\r
  74 //                      for(T t : v) proc.execute(graph, t);\r
  75 //                  }\r
  76 //              }\r
  77 //              \r
  78 //              for(AsyncMultiProcedure<T>  proc : p) proc.finished(graph);\r
  79 //        }\r
  80         \r
  81     }\r
  82 \r
  83     final synchronized public void except(AsyncReadGraph graph, Throwable t) {\r
  84 \r
  85         assert(isPending());\r
  86 \r
  87 //        ArrayList<AsyncMultiProcedure<T>> p = null;\r
  88 \r
  89         synchronized(this) {\r
  90 \r
  91                 except(t);\r
  92 //            p = procs;\r
  93 //            procs = null; \r
  94         \r
  95         }\r
  96         \r
  97 //        if(p != null) {\r
  98 //              for(AsyncMultiProcedure<T>  proc : p) proc.exception(graph, t);\r
  99 //        }\r
 100         \r
 101     }\r
 102 \r
 103     final synchronized public void addOrSet(Object item) {\r
 104 \r
 105         assert(isPending());\r
 106         \r
 107         ArrayList<T> value = (ArrayList<T>)getResult(); \r
 108         value.add((T)item);\r
 109         \r
 110     }\r
 111     \r
 112     @Override\r
 113     public void clearResult(QuerySupport support) {\r
 114         setResult(new ArrayList<T>());\r
 115     }\r
 116     \r
 117     @Override\r
 118     final public Query getQuery() {\r
 119         \r
 120         return new Query() {\r
 121 \r
 122                         @Override\r
 123                         public void recompute(ReadGraphImpl graph, Object provider, CacheEntry entry) {\r
 124                                 \r
 125                                 QueryProcessor qp = (QueryProcessor)provider;\r
 126 \r
 127                                 final ReadGraphImpl parentGraph = ReadGraphImpl.forRecompute(entry, qp); \r
 128 \r
 129                                 try {\r
 130 \r
 131                                     request.perform(parentGraph , new AsyncMultiProcedure<T>() {\r
 132 \r
 133                         @Override\r
 134                         public void execute(AsyncReadGraph graph, T result) {\r
 135                             addOrSet(result);\r
 136                         }\r
 137                         \r
 138                         public void finished(AsyncReadGraph graph) {\r
 139                                 finish(graph);\r
 140                         };\r
 141                                         \r
 142                                         @Override\r
 143                                         public void exception(AsyncReadGraph graph, Throwable t) {\r
 144                             except(t);\r
 145                             }\r
 146 \r
 147                     });\r
 148 \r
 149                                 } catch (Throwable t) {\r
 150                     except(t);\r
 151                     if(DebugException.DEBUG) new DebugException(t).printStackTrace();\r
 152                 }\r
 153                                 \r
 154                         }\r
 155 \r
 156                         @Override\r
 157                         public void removeEntry(QueryProcessor processor) {\r
 158                         processor.asyncMultiReadMap.remove(request);\r
 159                         }\r
 160 \r
 161                         @Override\r
 162                         public int type() {\r
 163                                 return RequestFlags.INVALIDATE;\r
 164                         }\r
 165                         \r
 166                         @Override\r
 167                         public String toString() {\r
 168                                 if(request == null) return "DISCARDED";\r
 169                                 else return request.toString() + statusOrException;\r
 170                         }\r
 171                 \r
 172         };\r
 173         \r
 174     }\r
 175 \r
 176         @Override\r
 177         public void performFromCache(ReadGraphImpl graph, Object provider, Object procedure) {\r
 178                 \r
 179                 final AsyncMultiProcedure<T> proc = (AsyncMultiProcedure<T>)procedure;\r
 180 \r
 181         if(isExcepted()) {\r
 182 \r
 183             try {\r
 184                 proc.exception(graph, (Throwable)getResult());\r
 185             } catch (Throwable t) {\r
 186                 t.printStackTrace();\r
 187             }\r
 188             \r
 189             \r
 190         } else {\r
 191             \r
 192             final ArrayList<T> values = (ArrayList<T>)getResult();\r
 193             for(T value : values) {\r
 194                 try {\r
 195                     proc.execute(graph, value);\r
 196                 } catch (Throwable t) {\r
 197                     t.printStackTrace();\r
 198                 }\r
 199             }\r
 200 \r
 201             try {\r
 202                 proc.finished(graph);\r
 203             } catch (Throwable t) {\r
 204                 t.printStackTrace();\r
 205             }\r
 206 \r
 207         }\r
 208                 \r
 209                 \r
 210                 \r
 211         }\r
 212 \r
 213 //      @Override\r
 214 //      public void performFromCache(int callerThread, Object provider,\r
 215 //                      Object procedure) {\r
 216 //\r
 217 //          QueryProvider2 queryProvider = (QueryProvider2)provider;\r
 218 //          ReadGraphImpl graph = ReadGraphImpl.forFromCache(callerThread, null, new ReadGraphSupportImpl(null, queryProvider, null));\r
 219 //              performFromCache(graph, provider, procedure);\r
 220 //              \r
 221 //      }\r
 222         \r
 223         @Override\r
 224         public String toString() {\r
 225                 if(request == null) return "DISCARDED";\r
 226                 else return request.toString() + statusOrException;\r
 227         }\r
 228 \r
 229 }\r