1 /*******************************************************************************
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2 * Copyright (c) 2007, 2013 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.diagram.participant.e4;
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14 import java.util.ArrayList;
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15 import java.util.Collection;
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16 import java.util.Collections;
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17 import java.util.HashSet;
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18 import java.util.Set;
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20 import org.eclipse.e4.ui.services.EContextService;
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21 import org.simantics.g2d.canvas.ICanvasContext;
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22 import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;
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23 import org.simantics.utils.ObjectUtils;
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24 import org.simantics.utils.threads.IThreadWorkQueue;
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25 import org.simantics.utils.threads.ThreadUtils;
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28 * ContextUtil manages the activeness of Eclipse Workbench UI context related to
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29 * an ICanvasContext and an IContextService (possibly local to a workbench part).
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31 * @author Tuukka Lehtonen
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33 public class ContextUtil extends AbstractCanvasParticipant {
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35 private static final boolean DEBUG = false;
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37 private final EContextService service;
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39 private final IThreadWorkQueue thread;
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41 private final Set<String> activations = new HashSet<String>();
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43 public ContextUtil(EContextService service, IThreadWorkQueue contextManipulationThread) {
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44 assert service != null;
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45 assert contextManipulationThread != null;
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46 this.service = service;
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47 this.thread = contextManipulationThread;
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50 public void inContextThread(Runnable r) {
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54 private void debug(String s) {
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58 private void debug(boolean trace, String s) {
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60 System.out.println(getClass().getSimpleName() + "(" + ObjectUtils.hashCode(getContext()) + "): " + s);
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62 StackTraceElement[] es = new Exception().getStackTrace();
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64 System.out.println("Invoked from: ");
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65 for (int i = 0; i < 2 && e < es.length; ++e) {
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66 if (es[e].getClassName().equals(getClass().getName()))
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68 System.out.println("\t" + es[e].toString());
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75 private void checkThread() {
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76 if (!thread.currentThreadAccess()) {
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77 throw new IllegalStateException("not in context thread, use ContextUtil.inContextThread(Runnable)");
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81 private void exec(Runnable r) {
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85 private void exec(Runnable r, boolean allowSchedule) {
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89 // Context access thread is disposed already?
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90 if (thread.getThread() == null)
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93 if (thread.currentThreadAccess()) {
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95 debug("RUNNING " + r);
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99 debug("SCHEDULING " + r);
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100 ThreadUtils.asyncExec(thread, r);
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105 public void removedFromContext(ICanvasContext ctx) {
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106 exec(new Runnable() {
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108 public void run() {
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112 super.removedFromContext(ctx);
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115 private void doActivate(String contextId) {
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116 if(activations.add(contextId)) {
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117 service.activateContext(contextId);
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119 debug("ACTIVATED context: " + contextId);
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122 debug("TRIED TO ACTIVATE DUPLICATE CONTEXT: " + contextId);
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126 public void activate(final String contextId) {
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129 debug(true, "activate(" + contextId + ")");
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130 assert contextId != null;
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131 exec(new Runnable() {
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133 public void run() {
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134 doActivate(contextId);
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139 public void activate(final Collection<String> contextIds) {
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141 debug(true, "activate contexts (" + contextIds + ")");
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142 if (contextIds.isEmpty())
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144 exec(new Runnable() {
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146 public void run() {
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147 for (String id : contextIds) {
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154 public void deactivate(Collection<String> contextIds) {
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156 assert contextIds != null;
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157 for(String id : contextIds) {
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158 boolean a = activations.remove(id);
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160 debug(true, "deactivate(" + id + "): " + a);
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162 exec(new Runnable() {
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164 public void run() {
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166 debug("DE-ACT context: " + id);
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167 service.deactivateContext(id);
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173 public void deactivateAll() {
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175 final Collection<String> contextIds = getActivatedContextIds();
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177 debug(true, "DE-ACTIVATE ALL INVOKED, " + contextIds.size() + " contexts to deactivate");
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178 activations.clear();
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179 exec(new Runnable() {
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181 public void run() {
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183 debug("\tDE-ACTIVATE ALL " + contextIds.size() + " contexts:");
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184 for (String id : contextIds) {
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186 debug("\t\tDE-ACT context: " + id);
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187 service.deactivateContext(id);
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193 public synchronized Collection<String> getActivatedContextIds() {
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194 return Collections.unmodifiableCollection(new ArrayList<String>(activations));
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