Examples with RuntimeConfigurer io.cdap.cdap.api.app.RuntimeConfigurer used on opensource projects

Example 1 with RuntimeConfigurer

use of io.cdap.cdap.api.app.RuntimeConfigurer in project cdap by caskdata.

the class InMemoryConfigurator method createResponse.

private <T extends Config> ConfigResponse createResponse(Application<T> app, ClassLoader artifactClassLoader) throws Exception {
    // This Gson cannot be static since it is used to deserialize user class.
    // Gson will keep a static map to class, hence will leak the classloader
    Gson gson = new GsonBuilder().registerTypeAdapterFactory(new CaseInsensitiveEnumTypeAdapterFactory()).create();
    // Now, we call configure, which returns application specification.
    DefaultAppConfigurer configurer;
    File tempDir = DirUtils.createTempDir(baseUnpackDir);
    try (PluginInstantiator pluginInstantiator = new PluginInstantiator(cConf, app.getClass().getClassLoader(), tempDir)) {
        RuntimeConfigurer runtimeConfigurer = runtimeInfo != null ? new DefaultAppRuntimeConfigurer(appNamespace.getId(), remoteClientFactory, runtimeInfo.getUserArguments(), runtimeInfo.getExistingAppSpec()) : null;
        configurer = new DefaultAppConfigurer(appNamespace, artifactId, app, configString, pluginFinder, pluginInstantiator, runtimeConfigurer, runtimeInfo, featureFlagsProvider);
        T appConfig;
        Type configType = Artifacts.getConfigType(app.getClass());
        if (configString.isEmpty()) {
            // noinspection unchecked
            appConfig = ((Class<T>) configType).newInstance();
        } else {
            try {
                appConfig = gson.fromJson(configString, configType);
            } catch (JsonSyntaxException e) {
                throw new IllegalArgumentException("Invalid JSON configuration was provided. Please check the syntax.", e);
            }
        }
        try {
            ClassLoader oldClassLoader = ClassLoaders.setContextClassLoader(new CombineClassLoader(null, app.getClass().getClassLoader(), getClass().getClassLoader()));
            try {
                app.configure(configurer, new DefaultApplicationContext<>(appConfig));
            } finally {
                ClassLoaders.setContextClassLoader(oldClassLoader);
            }
        } catch (Throwable t) {
            Throwable rootCause = Throwables.getRootCause(t);
            if (rootCause instanceof ClassNotFoundException) {
                // Heuristic to provide better error message
                String missingClass = rootCause.getMessage();
                // If the missing class has "spark" in the name, try to see if Spark is available
                if (missingClass.startsWith("org.apache.spark.") || missingClass.startsWith("io.cdap.cdap.api.spark.")) {
                    // Try to load the SparkContext class, which should be available if Spark is available in the platform
                    try {
                        artifactClassLoader.loadClass("org.apache.spark.SparkContext");
                    } catch (ClassNotFoundException e) {
                        // Spark is not available, it is most likely caused by missing Spark in the platform
                        throw new IllegalStateException("Missing Spark related class " + missingClass + ". It may be caused by unavailability of Spark. " + "Please verify environment variable " + Constants.SPARK_HOME + " is set correctly", t);
                    }
                    // Spark is available, can be caused by incompatible Spark version
                    throw new InvalidArtifactException("Missing Spark related class " + missingClass + ". Configured to use Spark located at " + System.getenv(Constants.SPARK_HOME) + ", which may be incompatible with the one required by the application", t);
                }
                // then the missing class is most likely due to some missing library in the artifact jar
                throw new InvalidArtifactException("Missing class " + missingClass + ". It may be caused by missing dependency jar(s) in the artifact jar.", t);
            }
            throw t;
        }
    } finally {
        try {
            DirUtils.deleteDirectoryContents(tempDir);
        } catch (IOException e) {
            LOG.warn("Exception raised when deleting directory {}", tempDir, e);
        }
    }
    ApplicationSpecification specification = configurer.createSpecification(applicationName, applicationVersion);
    AppSpecInfo appSpecInfo = new AppSpecInfo(specification, configurer.getSystemTables(), configurer.getMetadata());
    return new DefaultConfigResponse(0, appSpecInfo);
}