| /*=============================================================================# |
| # Copyright (c) 2008, 2020 Stephan Wahlbrink and others. |
| # |
| # This program and the accompanying materials are made available under the |
| # terms of the Eclipse Public License 2.0 which is available at |
| # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0 |
| # which is available at https://www.apache.org/licenses/LICENSE-2.0. |
| # |
| # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 |
| # |
| # Contributors: |
| # Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation |
| #=============================================================================*/ |
| |
| package org.eclipse.statet.ltk.model.core.impl; |
| |
| import java.util.HashMap; |
| import java.util.LinkedList; |
| |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.ISafeRunnable; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.SafeRunner; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.core.runtime.jobs.Job; |
| |
| import org.eclipse.statet.jcommons.collections.ImIdentityList; |
| |
| import org.eclipse.statet.internal.ltk.core.LTKCorePlugin; |
| import org.eclipse.statet.ltk.core.LTK; |
| import org.eclipse.statet.ltk.core.LTKUtils; |
| import org.eclipse.statet.ltk.core.WorkingContext; |
| import org.eclipse.statet.ltk.model.core.ElementChangedEvent; |
| import org.eclipse.statet.ltk.model.core.IElementChangedListener; |
| import org.eclipse.statet.ltk.model.core.IModelElementDelta; |
| import org.eclipse.statet.ltk.model.core.elements.IModelElement; |
| import org.eclipse.statet.ltk.model.core.elements.ISourceUnit; |
| import org.eclipse.statet.ltk.model.core.elements.ISourceUnitModelInfo; |
| |
| |
| /** |
| * Abstract model update event job |
| */ |
| public abstract class AbstractModelEventJob<ElementType extends IModelElement, InfoType extends ISourceUnitModelInfo> extends Job { |
| |
| |
| private static class SafeRunnable implements ISafeRunnable { |
| |
| final ElementChangedEvent event; |
| IElementChangedListener listener; |
| |
| public SafeRunnable(final ElementChangedEvent event) { |
| this.event= event; |
| } |
| |
| @Override |
| public void run() { |
| this.listener.elementChanged(this.event); |
| } |
| |
| @Override |
| public void handleException(final Throwable e) { |
| LTKCorePlugin.log(new Status(IStatus.ERROR, LTK.BUNDLE_ID, -1, |
| "An error occured while notifying an ElementChangedListener.", e )); //$NON-NLS-1$ |
| } |
| |
| } |
| |
| protected class Task { |
| |
| private final ElementType element; |
| private InfoType oldInfo; |
| private InfoType newInfo; |
| |
| |
| public Task(final ElementType element) { |
| this.element= element; |
| } |
| |
| |
| public ElementType getElement() { |
| return this.element; |
| } |
| |
| public InfoType getOldInfo() { |
| return this.oldInfo; |
| } |
| |
| public InfoType getNewInfo() { |
| return this.newInfo; |
| } |
| |
| |
| void run() { |
| final IModelElementDelta delta= createDelta(this); |
| fireDelta(delta); |
| } |
| } |
| |
| |
| private final AbstractModelManager modelManager; |
| |
| private final Object tasksLock= new Object(); |
| private final LinkedList<IModelElement> taskQueue= new LinkedList<>(); |
| private final HashMap<IModelElement, Task> taskDetail= new HashMap<>(); |
| |
| private boolean working= false; |
| private boolean stop= false; |
| |
| |
| public AbstractModelEventJob(final AbstractModelManager manager) { |
| super("Model Events for " + manager.getModelTypeId()); //$NON-NLS-1$ |
| setPriority(BUILD); |
| setSystem(true); |
| setUser(false); |
| |
| this.modelManager= manager; |
| } |
| |
| |
| public void addUpdate(final ElementType element, |
| final InfoType oldModel, final InfoType newModel) { |
| synchronized (this.tasksLock) { |
| Task task= this.taskDetail.get(element); |
| if (task == null) { |
| task= new Task(element); |
| task.oldInfo= oldModel; |
| this.taskDetail.put(element, task); |
| } |
| else { |
| this.taskQueue.remove(element); |
| } |
| task.newInfo= newModel; |
| this.taskQueue.add(element); |
| |
| if (!this.working) { |
| schedule(); |
| } |
| } |
| } |
| |
| protected abstract IModelElementDelta createDelta(Task task); |
| |
| |
| @Override |
| protected IStatus run(final IProgressMonitor monitor) { |
| while (true) { |
| Task task; |
| synchronized (this.tasksLock) { |
| final IModelElement element= (!this.taskQueue.isEmpty()) ? this.taskQueue.removeFirst() : null; |
| if (element == null || this.stop) { |
| this.working= false; |
| return Status.OK_STATUS; |
| } |
| this.working= true; |
| task= this.taskDetail.remove(element); |
| } |
| try { |
| task.run(); |
| } |
| catch (final Throwable e) { |
| LTKCorePlugin.log(new Status(IStatus.ERROR, LTK.BUNDLE_ID, -1, |
| "An error occurred when firing model event for " + this.modelManager.getModelTypeId() + ".", //$NON-NLS-1$ |
| e )); |
| } |
| } |
| } |
| |
| protected void dispose() { |
| synchronized (this.tasksLock) { |
| this.stop= true; |
| this.taskQueue.clear(); |
| this.taskDetail.clear(); |
| } |
| } |
| |
| private void fireDelta(final IModelElementDelta delta) { |
| final ISourceUnit su= LTKUtils.getSourceUnit(delta.getModelElement()); |
| if (su == null) { |
| return; |
| } |
| final WorkingContext context= su.getWorkingContext(); |
| final ElementChangedEvent event= new ElementChangedEvent(delta, context); |
| final SafeRunnable runnable= new SafeRunnable(event); |
| final ImIdentityList<IElementChangedListener> listeners= this.modelManager.getElementChangedListeners(context); |
| for (final IElementChangedListener listener : listeners) { |
| runnable.listener= listener; |
| SafeRunner.run(runnable); |
| } |
| } |
| |
| } |