| /******************************************************************************* |
| * Copyright (c) 2009, 2015 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| * Lars Vogel <Lars.Vogel@vogella.com> - Bug 474274 |
| *******************************************************************************/ |
| package org.eclipse.e4.core.internal.tests.manual; |
| |
| import static org.junit.Assert.assertTrue; |
| |
| import javax.inject.Inject; |
| |
| import org.eclipse.e4.core.contexts.ContextFunction; |
| import org.eclipse.e4.core.contexts.ContextInjectionFactory; |
| import org.eclipse.e4.core.contexts.EclipseContextFactory; |
| import org.eclipse.e4.core.contexts.IEclipseContext; |
| import org.junit.Test; |
| |
| |
| /** |
| * This is a demo of a scenario when computed values don't work. The basic idea here is that a |
| * calculated value depends on something not stored in the context, it won't necessarily be updated. |
| * |
| * CalculatedValue = Function(ContextElement1, ..., ContextElement1N, ExtnernalFactor) |
| * |
| * In this scenario we deal with the Output = Function(arg1, ..., arg10, Time) |
| * |
| * We use a system timer here as an external input, but it can be pretty much anything not stored |
| * directly in the context. |
| */ |
| public class ComputedValueLimitationTest { |
| |
| |
| /** |
| * Used as an injection target |
| */ |
| public static class UserObject { |
| |
| private String txt; |
| |
| @Inject |
| public void Computed(String txt) { |
| this.txt = txt; |
| } |
| |
| public String getComputed() { |
| return txt; |
| } |
| } |
| |
| static public class ExtenralFactor { |
| static public int useChild() { |
| long time = System.currentTimeMillis(); |
| return ((int) time % 10); // this is incorrect but works for the example |
| } |
| } |
| |
| public static class CalcColor extends ContextFunction { |
| |
| @Override |
| public Object compute(IEclipseContext context, String contextKey) { |
| int useArg = ExtenralFactor.useChild(); |
| return context.get("arg" + useArg); |
| } |
| } |
| |
| public static class Time extends ContextFunction { |
| @Override |
| public Object compute(IEclipseContext context, String contextKey) { |
| context.get(String.valueOf(System.currentTimeMillis())); |
| return Long.valueOf(System.currentTimeMillis()); |
| } |
| } |
| |
| @Test |
| public synchronized void testInjection() { |
| |
| IEclipseContext context = EclipseContextFactory.create(); |
| for (int i = 0; i < 10; i++) { |
| context.set("arg" + i, Integer.toString(i)); |
| } |
| context.set("computed", new CalcColor()); |
| |
| UserObject userObject = new UserObject(); |
| ContextInjectionFactory.inject(userObject, context); |
| |
| for (int i = 0; i < 20; i++) { |
| int before = ExtenralFactor.useChild(); |
| String actual = userObject.getComputed(); |
| int after = ExtenralFactor.useChild(); |
| System.out.println("[" + before + "] actual: " + actual + " [" + after + "]"); |
| try { |
| wait(1); |
| } catch (InterruptedException e) { |
| // TODO Auto-generated catch block |
| e.printStackTrace(); |
| } |
| } |
| } |
| |
| @Test |
| public void testVolatileFunction() { |
| IEclipseContext context = EclipseContextFactory.create(); |
| context.set("time", new Time()); |
| long time = ((Long) context.get("time")).longValue(); |
| try { |
| Thread.sleep(100); |
| } catch (InterruptedException e) { |
| // |
| } |
| long newTime = ((Long) context.get("time")).longValue(); |
| assertTrue(time != newTime); |
| } |
| |
| } |