Examples with Reflection com.cinchapi.common.reflect.Reflection used on opensource projects

Example 1 with Reflection

use of com.cinchapi.common.reflect.Reflection in project concourse by cinchapi.

the class PluginManager method activate.

/**
 * Activating a {@code bundle} means that all the plugins with the bundle
 * are loaded from disk and stored within the {@link #registry}. Depending
 * on the {@code type} some pre-launch hooks may be run. If all those hooks
 * are successful, each of the plugins in the bundle are
 * {@link #launch(String, Path, Class, List) launched}.
 *
 * @param bundle the name of the plugin bundle
 * @param type the {@link ActivationType type} of activation
 */
protected void activate(String bundle, ActivationType type) {
    Logger.debug("Activating plugins from {}", bundle);
    Path home = Paths.get(this.home, bundle);
    Path lib = home.resolve("lib");
    Path prefs = home.resolve("conf").resolve(PluginConfiguration.PLUGIN_PREFS_FILENAME);
    Path prefsDev = home.resolve("conf").resolve(PluginConfiguration.PLUGIN_PREFS_DEV_FILENAME);
    if (Files.exists(prefsDev)) {
        prefs = prefsDev;
        prefsDev = null;
    }
    try (DirectoryStream<Path> stream = Files.newDirectoryStream(lib)) {
        Iterator<Path> jars = stream.iterator();
        // Go through all the jars in the plugin's lib directory and compile
        // the appropriate classpath while identifying jars that might
        // contain plugin endpoints.
        List<URL> urls = Lists.newArrayList();
        List<String> classpath = Lists.newArrayList();
        while (jars.hasNext()) {
            String filename = jars.next().getFileName().toString();
            Path path = lib.resolve(filename);
            URL url = new File(path.toString()).toURI().toURL();
            if (!SYSTEM_JARS.contains(filename) || type.mightRequireHooks()) {
                // NOTE: by checking for exact name matches, we will
                // accidentally include system jars that contain different
                // versions.
                // NOTE: if a hook must be run, we have to include all the
                // jars (including system ones) so that the full context in
                // which the hook was written is available.
                urls.add(url);
            }
            classpath.add(url.getFile());
        }
        // Create a ClassLoader that only contains jars with possible plugin
        // endpoints and search for any applicable classes.
        URLClassLoader loader = new URLClassLoader(urls.toArray(new URL[0]), null);
        Class parent = loader.loadClass(Plugin.class.getName());
        Class realTimeParent = loader.loadClass(RealTimePlugin.class.getName());
        Reflections reflection = new Reflections(new ConfigurationBuilder().addClassLoader(loader).addUrls(ClasspathHelper.forClassLoader(loader)));
        Set<Class<?>> subTypes = reflection.getSubTypesOf(parent);
        Iterable<Class<?>> plugins = subTypes.stream().filter((clz) -> !clz.isInterface() && !Modifier.isAbstract(clz.getModifiers()))::iterator;
        JsonObject manifest = loadBundleManifest(bundle);
        Version version = Versions.parseSemanticVersion(manifest.get("bundleVersion").getAsString());
        for (final Class<?> plugin : plugins) {
            boolean launch = true;
            List<Throwable> errors = Lists.newArrayListWithCapacity(0);
            // actually be launched
            if (type.mightRequireHooks()) {
                try {
                    Class contextClass = loader.loadClass(PluginContext.class.getName());
                    Constructor contextConstructor = contextClass.getDeclaredConstructor(Path.class, String.class, String.class);
                    contextConstructor.setAccessible(true);
                    String concourseVersion = Versions.parseSemanticVersion(com.cinchapi.concourse.util.Version.getVersion(ConcourseServer.class).toString()).toString();
                    Object context = contextConstructor.newInstance(home, version.toString(), concourseVersion);
                    Class iface;
                    switch(type) {
                        case INSTALL:
                        default:
                            iface = loader.loadClass(AfterInstallHook.class.getName());
                            break;
                    }
                    Set<Class<?>> potential = reflection.getSubTypesOf(iface);
                    Iterable<Class<?>> hooks = potential.stream().filter((hook) -> !hook.isInterface() && !Modifier.isAbstract(hook.getModifiers()))::iterator;
                    for (Class<?> hook : hooks) {
                        Logger.info("Running hook '{}' for plugin '{}'", hook.getName(), plugin);
                        Object instance = Reflection.newInstance(hook);
                        Reflection.call(instance, "run", context);
                    }
                } catch (Exception e) {
                    Throwable error = Throwables.getRootCause(e);
                    Logger.error("Could not run {} hook for {}:", type, plugin, error);
                    launch = false;
                    errors.add(error);
                }
            }
            if (launch && errors.isEmpty()) {
                launch(bundle, prefs, plugin, classpath);
                startEventLoop(plugin.getName());
                if (realTimeParent.isAssignableFrom(plugin)) {
                    startStreamToPlugin(plugin.getName());
                }
            } else {
                // to consequences.
                if (type == ActivationType.INSTALL) {
                    Logger.error("Errors occurred when trying to " + "install {}: {}", bundle, errors);
                    throw new PluginInstallException("Could not install " + bundle + " due to the following errors: " + errors);
                } else {
                    Logger.error("An error occurred when trying to " + "activate {}", bundle);
                // TODO: call deactivate(bundle) whenever that method is
                // ready
                }
                break;
            }
        }
        bundles.put(bundle, version);
    } catch (IOException | ClassNotFoundException e) {
        Logger.error("An error occurred while trying to activate the plugin bundle '{}'", bundle, e);
        throw CheckedExceptions.wrapAsRuntimeException(e);
    }
}