Activator.java 文件源码

@Override
public void start(BundleContext context) {
    logErrors = Boolean.parseBoolean(context.getProperty("osgi.jpms.layer.log.errors"));
    // Check that the launcher created a layer for the framework
    Module systemModule = context.getClass().getModule();
    if (!Constants.SYSTEM_BUNDLE_SYMBOLICNAME.equals(systemModule.getName())) {
        throw new IllegalStateException("The framework launcher has not setup the system.bundle module for the framework implementation: " + getClass().getModule());
    }
    logService = new ServiceTracker<>(context, LOG_SERVICE, null);
    logService.open();
    // Create the LayerFactory implementation and register it
    factory = new LayerFactoryImpl(this, context, systemModule);
    // The factory is a bundle listener to keep track of resolved bundles
    context.addBundleListener(factory);
    // The factory is also a WovenClassListener to intercept bundle class loaders before
    // they define any classes.  This is to ensure they are part of a layer before the
    // first class is defined.
    String[] serviceClasses = new String[] {LayerFactory.class.getName(), WovenClassListener.class.getName(), WeavingHook.class.getName()};
    factoryReg = context.registerService(serviceClasses, factory, null);
}