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

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