1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.db.impl.procedure;
14 import java.util.concurrent.atomic.AtomicBoolean;
16 import org.simantics.db.AsyncReadGraph;
17 import org.simantics.db.common.utils.Logger;
18 import org.simantics.db.procedure.AsyncProcedure;
20 public class ResultCallWrappedSingleQueryProcedure4<Result> implements AsyncProcedure<Result> {
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;
28 public ResultCallWrappedSingleQueryProcedure4(AsyncProcedure<Result> procedure, Object key) {
29 assert(procedure != null);
31 this.procedure = procedure;
32 latch = new AtomicBoolean(false);
36 public void execute(AsyncReadGraph graph, Result result) {
38 if(latch.compareAndSet(false, true)) {
40 procedure.execute(graph, result);
41 } catch (Throwable throwable) {
42 Logger.defaultLogError("AsyncProcedure.execute threw for " + procedure, throwable);
44 // System.err.println("ResultCallWrappedSingleQueryProcedure4 dec " + key);
47 Logger.defaultLogError("Procedure was called many times (this time is execute)");
52 public void exception(AsyncReadGraph graph, Throwable t) {
54 if(latch.compareAndSet(false, true)) {
56 procedure.exception(graph, t);
57 } catch (Throwable throwable) {
58 Logger.defaultLogError("AsyncProcedure.exception threw for " + procedure, throwable);
62 Logger.defaultLogError("Procedure was called many times (this time is exception)");
67 public Result getResult() {
71 public Throwable getException() {
76 public String toString() {
77 return "." + procedure;