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 Object key;
  27     final private ReadGraphImpl graph;
  28         final private AsyncProcedure<Result> procedure;
  29
  30     private Result result = null;
  31     private Throwable exception = null;
  32
  33     public BlockingAsyncProcedure(ReadGraphImpl graph, AsyncProcedure<Result> procedure, Object key) {
  34         this.procedure = procedure;
  35         this.key = key;
  36         this.graph = ReadGraphImpl.newAsync(graph);
  37         this.graph.asyncBarrier.inc();
  38     }
  39
  40     @Override
  41     public void execute(AsyncReadGraph graph, Result result) {
  42         this.result = result;
  43         this.graph.asyncBarrier.dec();
  44         try {
  45                 if(procedure != null) procedure.execute(graph, result);
  46         } catch (Throwable throwable) {
  47                 Logger.defaultLogError("AsyncProcedure.execute threw for " + procedure, throwable);
  48         }
  49     }
  50
  51     @Override
  52     public void exception(AsyncReadGraph graph, Throwable t) {
  53         this.exception = t;
  54         try {
  55                 if(procedure != null) procedure.exception(graph, t);
  56         } catch (Throwable throwable) {
  57                 Logger.defaultLogError("AsyncProcedure.exception threw for " + procedure, throwable);
  58         } finally {
  59         }
  60         this.graph.asyncBarrier.dec();
  61     }
  62
  63     public Result get() throws DatabaseException {
  64
  65         graph.asyncBarrier.waitBarrier(key, graph);
  66
  67         if(exception != null) {
  68                 if(exception instanceof DatabaseException) throw (DatabaseException)exception;
  69                 throw new DatabaseException(exception);
  70         } else {
  71                 return result;
  72         }
  73
  74     }
  75
  76     public Result getResult() {
  77         return result;
  78     }
  79
  80     public Throwable getException() {
  81         return exception;
  82     }
  83
  84     @Override
  85     public String toString() {
  86         return "." + procedure;
  87     }
  88
  89 }