1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.modeling.utils;
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14 import org.eclipse.core.runtime.IProgressMonitor;
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15 import org.eclipse.core.runtime.IStatus;
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16 import org.eclipse.core.runtime.Status;
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17 import org.eclipse.core.runtime.SubMonitor;
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18 import org.eclipse.core.runtime.jobs.Job;
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19 import org.simantics.DatabaseJob;
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20 import org.simantics.Simantics;
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21 import org.simantics.db.ReadGraph;
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22 import org.simantics.db.Resource;
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23 import org.simantics.db.Session;
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24 import org.simantics.db.common.procedure.adapter.ListenerAdapter;
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25 import org.simantics.db.common.request.ParametrizedRead;
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26 import org.simantics.db.common.request.UnaryRead;
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27 import org.simantics.db.exception.DatabaseException;
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28 import org.simantics.db.request.Read;
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29 import org.simantics.simulation.experiment.ExperimentState;
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30 import org.simantics.simulation.experiment.IExperiment;
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31 import org.simantics.simulation.experiment.IExperimentListener;
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32 import org.simantics.ui.workbench.editor.input.InputValidationCombinators;
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33 import org.simantics.utils.ui.ExceptionUtils;
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36 * @author Tuukka Lehtonen
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38 public class ExperimentExistenceWatchdog {
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40 public static ExperimentExistenceWatchdog activate(IExperiment experiment, Resource experimentResource) {
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41 ExperimentExistenceWatchdog validator = new ExperimentExistenceWatchdog(experiment, experimentResource,
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42 InputValidationCombinators.hasURI());
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43 validator.attachExperimentListener();
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44 validator.activateValidation();
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48 private Session session;
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49 private final Resource experimentResource;
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50 private IExperiment experiment;
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51 private final ParametrizedRead<Resource, Boolean> inputValidator;
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52 private InputListener inputListener;
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54 private ExperimentExistenceWatchdog(IExperiment experiment, Resource experimentResource, ParametrizedRead<Resource, Boolean> inputValidator) {
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55 this.session = Simantics.getSession();
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56 this.experiment = experiment;
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57 this.experimentResource = experimentResource;
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58 this.inputValidator = inputValidator;
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61 private void attachExperimentListener() {
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62 experiment.addListener(new IExperimentListener() {
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64 public void stateChanged(ExperimentState state) {
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65 if (state == ExperimentState.DISPOSED) {
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73 public void dispose() {
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74 deactivateValidation();
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79 protected boolean isDisposed() {
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80 return session == null || experimentResource == null || experiment == null;
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83 public synchronized void activateValidation() {
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85 throw new IllegalStateException(this + " is disposed");
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86 if (inputListener != null)
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89 inputListener = new InputListener();
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90 session.asyncRequest(validationRequest(), inputListener);
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93 public synchronized void deactivateValidation() {
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95 throw new IllegalStateException(this + " is disposed");
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96 if (inputListener == null)
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98 inputListener.dispose();
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99 inputListener = null;
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104 * @return a read request that returns <code>true</code> for valid inputs
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105 * and <code>false</code> for non-existent or invalid inputs.
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107 private Read<Boolean> validationRequest() {
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108 return new UnaryRead<Resource, Boolean>(experimentResource) {
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110 public Boolean perform(ReadGraph graph) throws DatabaseException {
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111 return graph.syncRequest(inputValidator.get(experimentResource));
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116 private class InputListener extends ListenerAdapter<Boolean> {
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118 private boolean disposed = false;
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120 public void dispose() {
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125 public void execute(Boolean evaluation) {
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126 if (!Boolean.TRUE.equals(evaluation)) {
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127 scheduleExperimentShutdown(experiment);
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132 public void exception(Throwable t) {
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133 ExceptionUtils.logError("ResourceEditorSupport.InputListener received an unexpected exception.", t);
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137 public boolean isDisposed() {
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138 return disposed || ExperimentExistenceWatchdog.this.isDisposed();
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142 private static void scheduleExperimentShutdown(final IExperiment experiment) {
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143 Job job = new DatabaseJob("Experiment Shutdown Watchdog") {
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145 protected IStatus run(IProgressMonitor monitor) {
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146 SubMonitor mon = SubMonitor.convert(monitor, "Shutdown", 100000);
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148 experiment.shutdown(mon.newChild(100000));
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149 return Status.OK_STATUS;
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