Examples with ImplementsService com.aws.greengrass.dependency.ImplementsService used on opensource projects

Example 1 with ImplementsService

use of com.aws.greengrass.dependency.ImplementsService in project aws-greengrass-nucleus by aws-greengrass.

the class Kernel method locateExternalPlugin.

@SuppressWarnings({ "PMD.AvoidCatchingThrowable", "PMD.CloseResource" })
private Class<?> locateExternalPlugin(String name, Topics serviceRootTopics) throws ServiceLoadException {
    ComponentIdentifier componentId = ComponentIdentifier.fromServiceTopics(serviceRootTopics);
    Path pluginJar;
    try {
        pluginJar = nucleusPaths.artifactPath(componentId).resolve(componentId.getName() + JAR_FILE_EXTENSION);
    } catch (IOException e) {
        throw new ServiceLoadException(e);
    }
    if (!pluginJar.toFile().exists() || !pluginJar.toFile().isFile()) {
        throw new ServiceLoadException(String.format("Unable to find %s because %s does not exist", name, pluginJar));
    }
    Topic storedDigest = config.find(SERVICES_NAMESPACE_TOPIC, MAIN_SERVICE_NAME, GreengrassService.RUNTIME_STORE_NAMESPACE_TOPIC, SERVICE_DIGEST_TOPIC_KEY, componentId.toString());
    if (storedDigest == null || storedDigest.getOnce() == null) {
        logger.atError("plugin-load-error").kv(GreengrassService.SERVICE_NAME_KEY, name).log("Local external plugin is not supported by this greengrass version");
        throw new ServiceLoadException("Custom plugins is not supported by this greengrass version");
    }
    ComponentStore componentStore = context.get(ComponentStore.class);
    if (!componentStore.validateComponentRecipeDigest(componentId, Coerce.toString(storedDigest))) {
        logger.atError("plugin-load-error").kv(GreengrassService.SERVICE_NAME_KEY, name).log("Local plugin does not match the version in cloud!!");
        throw new ServiceLoadException("Plugin has been modified after it was downloaded");
    }
    Class<?> clazz;
    try {
        AtomicReference<Class<?>> classReference = new AtomicReference<>();
        EZPlugins ezPlugins = context.get(EZPlugins.class);
        ezPlugins.loadPlugin(pluginJar, (sc) -> sc.matchClassesWithAnnotation(ImplementsService.class, (c) -> {
            // Only use the class whose name matches what we want
            ImplementsService serviceImplementation = c.getAnnotation(ImplementsService.class);
            if (serviceImplementation.name().equals(name)) {
                if (classReference.get() != null) {
                    logger.atWarn().log("Multiple classes implementing service found in {} " + "for component {}. Using the first one found: {}", pluginJar, name, classReference.get());
                    return;
                }
                classReference.set(c);
            }
        }));
        clazz = classReference.get();
    } catch (Throwable e) {
        throw new ServiceLoadException(String.format("Unable to load %s as a plugin", name), e);
    }
    if (clazz == null) {
        throw new ServiceLoadException(String.format("Unable to find %s. Could not find any ImplementsService annotation with the same name.", name));
    }
    return clazz;
}

Example 2 with ImplementsService

use of com.aws.greengrass.dependency.ImplementsService in project aws-greengrass-nucleus by aws-greengrass.

the class KernelLifecycle method findBuiltInServicesAndPlugins.

@SuppressWarnings("PMD.CloseResource")
private Queue<String> findBuiltInServicesAndPlugins() {
    Queue<String> autostart = new LinkedList<>();
    try {
        EZPlugins pim = kernel.getContext().get(EZPlugins.class);
        pim.withCacheDirectory(nucleusPaths.pluginPath());
        pim.annotated(ImplementsService.class, cl -> {
            if (!GreengrassService.class.isAssignableFrom(cl)) {
                logger.atError().log("{} needs to be a subclass of GreengrassService " + "in order to use ImplementsService", cl);
                return;
            }
            ImplementsService is = cl.getAnnotation(ImplementsService.class);
            if (is.autostart()) {
                autostart.add(is.name());
            }
            serviceImplementors.put(is.name(), cl);
            logger.atInfo().log("Found Plugin: {}", cl.getSimpleName());
        });
    } catch (IOException t) {
        logger.atError().log("Error finding built in service plugins", t);
    }
    return autostart;
}