bundles/org.simantics.db.impl/src/org/simantics/db/impl/procedure/ResultCallWrappedSingleQueryProcedure4.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.procedure;
  13
  14 import java.util.concurrent.atomic.AtomicBoolean;
  15
  16 import org.simantics.db.AsyncReadGraph;
  17 import org.simantics.db.common.utils.Logger;
  18 import org.simantics.db.impl.graph.AsyncBarrierImpl;
  19 import org.simantics.db.procedure.AsyncProcedure;
  20
  21 public class ResultCallWrappedSingleQueryProcedure4<Result> implements AsyncProcedure<Result> {
  22
  23         final private Object key;
  24     private Result result = null;
  25     private Throwable exception = null;
  26     final private AsyncProcedure<Result> procedure;
  27     final private AtomicBoolean latch;
  28
  29     public ResultCallWrappedSingleQueryProcedure4(AsyncProcedure<Result> procedure, Object key) {
  30         assert(procedure != null);
  31         this.key = key;
  32         this.procedure = procedure;
  33         latch = new AtomicBoolean(false);
  34     }
  35
  36     @Override
  37     public void execute(AsyncReadGraph graph, Result result) {
  38         this.result = result;
  39         if(latch.compareAndSet(false, true)) {
  40                 try {
  41                         procedure.execute(graph, result);
  42                 } catch (Throwable throwable) {
  43                 Logger.defaultLogError("AsyncProcedure.execute threw for " + procedure, throwable);
  44                 } finally {
  45 //                      System.err.println("ResultCallWrappedSingleQueryProcedure4 dec " + key);
  46                 }
  47         } else {
  48                 Logger.defaultLogError("Procedure was called many times (this time is execute)");
  49         }
  50     }
  51
  52     @Override
  53     public void exception(AsyncReadGraph graph, Throwable t) {
  54         this.exception = t;
  55         if(latch.compareAndSet(false, true)) {
  56                 try {
  57                         procedure.exception(graph, t);
  58                 } catch (Throwable throwable) {
  59                 Logger.defaultLogError("AsyncProcedure.exception threw for " + procedure, throwable);
  60                 } finally {
  61                 }
  62         } else {
  63                 Logger.defaultLogError("Procedure was called many times (this time is exception)");
  64         }
  65
  66     }
  67
  68     public Result getResult() {
  69         return result;
  70     }
  71
  72     public Throwable getException() {
  73         return exception;
  74     }
  75
  76     @Override
  77     public String toString() {
  78         return "." + procedure;
  79     }
  80
  81 }