bundles/org.simantics.db.impl/src/org/simantics/db/impl/BlockingAsyncProcedure.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;
  13
  14 import java.text.DecimalFormat;
  15 import java.util.concurrent.TimeUnit;
  16
  17 import org.simantics.db.AsyncReadGraph;
  18 import org.simantics.db.common.utils.Logger;
  19 import org.simantics.db.exception.DatabaseException;
  20 import org.simantics.db.impl.graph.AsyncBarrierImpl;
  21 import org.simantics.db.impl.graph.ReadGraphImpl;
  22 import org.simantics.db.procedure.AsyncProcedure;
  23
  24 public class BlockingAsyncProcedure<Result> implements AsyncProcedure<Result> {
  25
  26         final private static Object NO_RESULT = new Object();
  27
  28         final private Object key;
  29     final private ReadGraphImpl graph;
  30         final private AsyncProcedure<Result> procedure;
  31
  32     private Object result = NO_RESULT;
  33     private Throwable exception = null;
  34
  35     public BlockingAsyncProcedure(ReadGraphImpl graph, AsyncProcedure<Result> procedure, Object key) {
  36         this.procedure = procedure;
  37         this.key = key;
  38         this.graph = ReadGraphImpl.newAsync(graph);
  39         this.graph.asyncBarrier.inc();
  40     }
  41
  42     @Override
  43     public void execute(AsyncReadGraph graph, Result result) {
  44         this.result = result;
  45         this.graph.asyncBarrier.dec();
  46         try {
  47                 if(procedure != null) procedure.execute(graph, result);
  48         } catch (Throwable throwable) {
  49                 Logger.defaultLogError("AsyncProcedure.execute threw for " + procedure, throwable);
  50         }
  51     }
  52
  53     @Override
  54     public void exception(AsyncReadGraph graph, Throwable t) {
  55         this.exception = t;
  56         try {
  57                 if(procedure != null) procedure.exception(graph, t);
  58         } catch (Throwable throwable) {
  59                 Logger.defaultLogError("AsyncProcedure.exception threw for " + procedure, throwable);
  60         } finally {
  61         }
  62         this.graph.asyncBarrier.dec();
  63     }
  64
  65     public Result get() throws DatabaseException {
  66
  67         graph.asyncBarrier.waitBarrier(key, graph);
  68
  69         if(exception != null) {
  70                 if(exception instanceof DatabaseException) throw (DatabaseException)exception;
  71                 throw new DatabaseException(exception);
  72         } else {
  73                 return (Result)result;
  74         }
  75
  76     }
  77
  78     public Result getResult() {
  79         return (Result)result;
  80     }
  81
  82     public Throwable getException() {
  83         return exception;
  84     }
  85
  86     @Override
  87     public String toString() {
  88         return "." + procedure;
  89     }
  90
  91 }