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