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/*******************************************************************************
 * Copyright (c) 2009, 2013 Wind River Systems and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Wind River Systems - initial API and implementation
 *     IBM Corporation - bug fixing
 *******************************************************************************/
package org.eclipse.debug.tests.viewer.model;

import org.eclipse.debug.internal.ui.viewers.model.IInternalTreeModelViewer;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
import org.eclipse.debug.internal.ui.viewers.model.provisional.ModelDelta;
import org.eclipse.debug.tests.viewer.model.TestModel.TestElement;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.test.performance.Performance;
import org.eclipse.test.performance.PerformanceMeter;

/**
 * Tests to measure the performance of the viewer updates.
 */
abstract public class PerformanceTests extends AbstractViewerModelTest implements ITestModelUpdatesListenerConstants {

	protected VisibleVirtualItemValidator fVirtualItemValidator;

    public PerformanceTests(String name) {
        super(name);
    }

    @Override
	protected TestModelUpdatesListener createListener(IInternalTreeModelViewer viewer) {
		return new TestModelUpdatesListener(viewer, false, false);
	}

	@Override
	protected void setUp() throws Exception {
		super.setUp();
		fVirtualItemValidator = new VisibleVirtualItemValidator(0, Integer.MAX_VALUE);
    }

    /**
     * Depth (size) of the test model to be used in the tests.  This number allows
     * the jface based tests to use a small enough model to fit on the screen, and
     * for the virtual viewer to exercise the content provider to a greater extent.
     */
    abstract protected int getTestModelDepth();


	public void testRefreshStruct() throws Exception {
        TestModel model = new TestModel();
		model.setRoot(new TestElement(model, "root", new TestElement[0])); //$NON-NLS-1$
		model.setElementChildren(TreePath.EMPTY, TestModel.makeMultiLevelElements(model, getTestModelDepth(), "model.")); //$NON-NLS-1$

        fViewer.setAutoExpandLevel(-1);

        // Create the listener
        fListener.reset(TreePath.EMPTY, model.getRootElement(), -1, true, false);

        // Set the input into the view and update the view.
        fViewer.setInput(model.getRootElement());
		waitWhile(t -> !fListener.isFinished(), createListenerErrorMessage());
        model.validateData(fViewer, TreePath.EMPTY);

        Performance perf = Performance.getDefault();
        PerformanceMeter meter = perf.createPerformanceMeter(perf.getDefaultScenarioId(this));
        try {
            for (int i = 0; i < 10; i++) {
                // Update the model
				model.setAllAppendix(" - pass " + i); //$NON-NLS-1$

                TestElement element = model.getRootElement();
                fListener.reset(TreePath.EMPTY, element, -1, false, false);

                meter.start();
                model.postDelta(new ModelDelta(element, IModelDelta.CONTENT));
				waitWhile(t -> !fListener.isFinished(ALL_UPDATES_COMPLETE | MODEL_CHANGED_COMPLETE), createListenerErrorMessage());
                meter.stop();
                System.gc();
            }

            meter.commit();
            perf.assertPerformance(meter);
        } finally {
            meter.dispose();
        }
    }

	public void testRefreshStruct2() throws Exception {
        TestModel model = new TestModel();
		model.setRoot(new TestElement(model, "root", new TestElement[0])); //$NON-NLS-1$
		model.setElementChildren(TreePath.EMPTY, TestModel.makeMultiLevelElements2(model, new int[] { 2, 3000, 1 }, "model.")); //$NON-NLS-1$

        fViewer.setAutoExpandLevel(2);
        // Create the listener
        //fListener.reset(TreePath.EMPTY, model.getRootElement(), -1, false, false);
        fListener.reset();

        // Set the input into the view and update the view.
        fViewer.setInput(model.getRootElement());
		waitWhile(t -> !fListener.isFinished(ALL_UPDATES_COMPLETE), createListenerErrorMessage());

        fVirtualItemValidator.setVisibleRange(0, 50);

        Performance perf = Performance.getDefault();
        PerformanceMeter meter = perf.createPerformanceMeter(perf.getDefaultScenarioId(this));
        try {
            for (int i = 0; i < 100; i++) {
                // Update the model
				model.setAllAppendix(" - pass " + i); //$NON-NLS-1$

                TestElement element = model.getRootElement();
                //fListener.reset(TreePath.EMPTY, element, -1, false, false);
                fListener.reset();

                meter.start();
                model.postDelta(new ModelDelta(element, IModelDelta.CONTENT));
				waitWhile(t -> !fListener.isFinished(MODEL_CHANGED_COMPLETE), createListenerErrorMessage());
                model.postDelta(new ModelDelta(element, IModelDelta.CONTENT));
				waitWhile(t -> !fListener.isFinished(ALL_UPDATES_COMPLETE | MODEL_CHANGED_COMPLETE), createListenerErrorMessage());
                meter.stop();
                System.gc();
            }

            meter.commit();
            perf.assertPerformance(meter);
        } finally {
            meter.dispose();
        }
    }


	public void testRefreshStructReplaceElements() throws Exception {
        TestModel model = new TestModel();
		model.setRoot(new TestElement(model, "root", new TestElement[0])); //$NON-NLS-1$
		model.setElementChildren(TreePath.EMPTY, TestModel.makeMultiLevelElements(model, getTestModelDepth(), "model.")); //$NON-NLS-1$

        fViewer.setAutoExpandLevel(-1);

        // Create the listener
        fListener.reset(TreePath.EMPTY, model.getRootElement(), -1, true, false);

        // Set the input into the view and update the view.
        fViewer.setInput(model.getRootElement());
		waitWhile(t -> !fListener.isFinished(), createListenerErrorMessage());
        model.validateData(fViewer, TreePath.EMPTY);

        Performance perf = Performance.getDefault();
        PerformanceMeter meter = perf.createPerformanceMeter(perf.getDefaultScenarioId(this));
        try {
            for (int i = 0; i < 100; i++) {
                // Update the model
				model.setElementChildren(TreePath.EMPTY, TestModel.makeMultiLevelElements(model, getTestModelDepth(), "pass " + i + ".")); //$NON-NLS-1$ //$NON-NLS-2$

                TestElement element = model.getRootElement();
                fListener.reset(TreePath.EMPTY, element, -1, false, false);

                meter.start();
                model.postDelta(new ModelDelta(element, IModelDelta.CONTENT));
				waitWhile(t -> !fListener.isFinished(ALL_UPDATES_COMPLETE | MODEL_CHANGED_COMPLETE), createListenerErrorMessage());
                meter.stop();
                System.gc();
            }

            meter.commit();
            perf.assertPerformance(meter);
        } finally {
            meter.dispose();
        }
    }


	public void testRefreshList() throws Exception {
        TestModel model = new TestModel();
		model.setRoot(new TestElement(model, "root", new TestElement[0])); //$NON-NLS-1$
        int numElements = (int)Math.pow(2, getTestModelDepth());
		model.setElementChildren(TreePath.EMPTY, TestModel.makeSingleLevelModelElements(model, numElements, "model.")); //$NON-NLS-1$

        fViewer.setAutoExpandLevel(-1);

        // Create the listener
        fListener.reset(TreePath.EMPTY, model.getRootElement(), -1, true, false);

        // Set the input into the view and update the view.
        fViewer.setInput(model.getRootElement());
		waitWhile(t -> !fListener.isFinished(), createListenerErrorMessage());
        model.validateData(fViewer, TreePath.EMPTY);

        Performance perf = Performance.getDefault();
        PerformanceMeter meter = perf.createPerformanceMeter(perf.getDefaultScenarioId(this));
        try {
            for (int i = 0; i < 100; i++) {
                // Update the model
				model.setAllAppendix(" - pass " + i); //$NON-NLS-1$

                TestElement element = model.getRootElement();
                fListener.reset(TreePath.EMPTY, element, -1, false, false);

                meter.start();
                model.postDelta(new ModelDelta(element, IModelDelta.CONTENT));
				waitWhile(t -> !fListener.isFinished(ALL_UPDATES_COMPLETE | MODEL_CHANGED_COMPLETE), createListenerErrorMessage());
                meter.stop();
                System.gc();
            }

            meter.commit();
            perf.assertPerformance(meter);
        } finally {
            meter.dispose();
        }
    }

	public void testSaveAndRestore() throws Exception {
        //TreeModelViewerAutopopulateAgent autopopulateAgent = new TreeModelViewerAutopopulateAgent(fViewer);
        TestModel model = TestModel.simpleMultiLevel();

        // expand all elements
        fViewer.setAutoExpandLevel(-1);

        // Create the listener, only check the first level
        fListener.reset(TreePath.EMPTY, model.getRootElement(), -1, true, false);

        // Set the input into the view and update the view.
        fViewer.setInput(model.getRootElement());
		waitWhile(t -> !fListener.isFinished(), createListenerErrorMessage());
        model.validateData(fViewer, TreePath.EMPTY);

        // Set a selection in view
		fViewer.setSelection(new TreeSelection(model.findElement("3.2.3"))); //$NON-NLS-1$

        // Turn off the auto-expand now since we want to text the auto-expand logic
        fViewer.setAutoExpandLevel(-1);

        Performance perf = Performance.getDefault();
        PerformanceMeter meter = perf.createPerformanceMeter(perf.getDefaultScenarioId(this));
        try {
            for (int i = 0; i < 100; i++) {
                // Update the model
				model.setAllAppendix(" - pass " + i); //$NON-NLS-1$

                // Set the viewer input to null.  This will trigger the view to save the viewer state.
                fListener.reset(true, false);

                meter.start();
                fViewer.setInput(null);
				waitWhile(t -> !fListener.isFinished(STATE_SAVE_COMPLETE), createListenerErrorMessage());

                // Set the viewer input back to the model.  When view updates are complete
                // the viewer
                // Note: disable redundant updates because the reveal delta triggers one.
                fListener.reset(TreePath.EMPTY, model.getRootElement(), 1, false, false);
                // TODO: add state updates somehow?
                fViewer.setInput(model.getRootElement());
				waitWhile(t -> !fListener.isFinished(ALL_UPDATES_COMPLETE | STATE_RESTORE_COMPLETE), createListenerErrorMessage());
                meter.stop();
                System.gc();
            }

            meter.commit();
            perf.assertPerformance(meter);
        } finally {
            meter.dispose();
        }

    }

	public void testRefreshListFiltered() throws Exception {
        TestModel model = new TestModel();
		model.setRoot(new TestElement(model, "root", new TestElement[0])); //$NON-NLS-1$
        int numElements = (int)Math.pow(2, getTestModelDepth());
		model.setElementChildren(TreePath.EMPTY, TestModel.makeSingleLevelModelElements(model, numElements, "model.")); //$NON-NLS-1$

        fViewer.setAutoExpandLevel(-1);

        // Create the listener
        fListener.reset(TreePath.EMPTY, model.getRootElement(), -1, true, false);

        fViewer.addFilter(new ViewerFilter() {
            @Override
			public boolean select(Viewer viewer, Object parentElement, Object element) {
                if (element instanceof TestElement) {
                    String id = ((TestElement)element).getID();
					if (id.startsWith("model.")) { //$NON-NLS-1$
						id = id.substring("model.".length()); //$NON-NLS-1$
                    }
                    if (id.length() >= 2 && (id.charAt(1) == '1' || id.charAt(1) == '3' || id.charAt(1) == '5' || id.charAt(1) == '7' || id.charAt(1) == '9')) {
                        return false;
                    }
                }
                return true;
            }
        });

        // Set the input into the view and update the view.
        fViewer.setInput(model.getRootElement());
		waitWhile(t -> !fListener.isFinished(), createListenerErrorMessage());
        model.validateData(fViewer, TreePath.EMPTY);

        Performance perf = Performance.getDefault();
        PerformanceMeter meter = perf.createPerformanceMeter(perf.getDefaultScenarioId(this));
        try {
            for (int i = 0; i < 100; i++) {
                // Update the model
				model.setAllAppendix(" - pass " + i); //$NON-NLS-1$

                TestElement element = model.getRootElement();
                fListener.reset(TreePath.EMPTY, element, -1, false, false);

                meter.start();
                model.postDelta(new ModelDelta(element, IModelDelta.CONTENT));
				waitWhile(t -> !fListener.isFinished(ALL_UPDATES_COMPLETE | MODEL_CHANGED_COMPLETE), createListenerErrorMessage());
                meter.stop();
                System.gc();
            }

            meter.commit();
            perf.assertPerformance(meter);
        } finally {
            meter.dispose();
        }
    }

}

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