java - E4 无法在类变量上自动注入(inject) MApplication

Question

我有一个 E4 应用程序，我需要将 MApplication 注入(inject)到第一个创建的类中。该类本身已在我的 Activator 的 start 方法内创建并在那里调用。

我的类名为 FrameworkModule，如下所示:

public class FrameworkModule implements ISubscription {

    private static final Logger logger = LoggerFactory.getLogger(FrameworkModule.class);

    private @Inject IEclipseContext context;
    protected @Inject EPartService partService;

    protected @Inject MApplication application;

    protected @Inject EModelService modelService;
...
}

激活器将创建上述类并运行它的方法。激活器的启动方法如下所示:

@Override
    public void start(BundleContext bundleContext) throws Exception {
        Activator.context = bundleContext;

        IEclipseContext eContext = EclipseContextFactory.getServiceContext(bundleContext);

        ExecutorService service = Executors.newSingleThreadExecutor();

        service.execute(() -> {
            framework = ContextInjectionFactory.make(FrameworkModule.class, eContext);
            framework.startup();
        });

        service.execute(() -> CacheUtil.getManager());

        service.shutdown();
    }

当代码启动时，我收到以下错误:

 org.eclipse.e4.core.di.InjectionException: Unable to process "FrameworkModule.application": no actual value was found for the argument "MApplication".
    at org.eclipse.e4.core.internal.di.InjectorImpl.reportUnresolvedArgument(InjectorImpl.java:488)
    at org.eclipse.e4.core.internal.di.InjectorImpl.resolveRequestorArgs(InjectorImpl.java:479)
    at org.eclipse.e4.core.internal.di.InjectorImpl.internalInject(InjectorImpl.java:128)
    at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:411)
    at org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:333)
    at org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:202)
    at com.xxx.client.eclipse.Activator.lambda$0(Activator.java:84)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

如何在我的 FrameworkModule 类中修复此问题？我需要那里所有注入(inject)的类，但找不到方法将其到达那里。

Answer 1

EclipseContextFactory.getServiceContext返回的服务上下文内容非常有限，不包含MApplication。您无法在激活器中像这样创建类。

具体取决于您想要如何使用该类，您可以:

• 在 application.e4xmi 或fragment.e4xmi 中指定的“附加组件”中创建类
• 只需使用类上的@Creatable 注释来自动创建它即可。如果您想要该类的单个实例，还可以使用 @Singleton 注释。
• 在 LifeCycle 类中创建它
• 使用ContextFunction创建它