Examples with PTransform org.apache.beam.model.pipeline.v1.RunnerApi.PTransform used on opensource projects

Example 91 with PTransform

use of org.apache.beam.model.pipeline.v1.RunnerApi.PTransform in project beam by apache.

the class JavaClassLookupTransformProvider method getTransform.

@Override
public PTransform<PInput, POutput> getTransform(FunctionSpec spec) {
    JavaClassLookupPayload payload;
    try {
        payload = JavaClassLookupPayload.parseFrom(spec.getPayload());
    } catch (InvalidProtocolBufferException e) {
        throw new IllegalArgumentException("Invalid payload type for URN " + getUrn(ExpansionMethods.Enum.JAVA_CLASS_LOOKUP), e);
    }
    String className = payload.getClassName();
    try {
        AllowedClass allowlistClass = allowList.getAllowedClass(className);
        Class<PTransform<InputT, OutputT>> transformClass = (Class<PTransform<InputT, OutputT>>) ReflectHelpers.findClassLoader().loadClass(className);
        PTransform<PInput, POutput> transform;
        Row constructorRow = decodeRow(payload.getConstructorSchema(), payload.getConstructorPayload());
        if (payload.getConstructorMethod().isEmpty()) {
            Constructor<?>[] constructors = transformClass.getConstructors();
            Constructor<PTransform<InputT, OutputT>> constructor = findMappingConstructor(constructors, payload);
            Object[] parameterValues = getParameterValues(constructor.getParameters(), constructorRow, constructor.getGenericParameterTypes());
            transform = (PTransform<PInput, POutput>) constructor.newInstance(parameterValues);
        } else {
            Method[] methods = transformClass.getMethods();
            Method method = findMappingConstructorMethod(methods, payload, allowlistClass);
            Object[] parameterValues = getParameterValues(method.getParameters(), constructorRow, method.getGenericParameterTypes());
            transform = (PTransform<PInput, POutput>) method.invoke(null, /* static */
            parameterValues);
        }
        return applyBuilderMethods(transform, payload, allowlistClass);
    } catch (ClassNotFoundException e) {
        throw new IllegalArgumentException("Could not find class " + className, e);
    } catch (InstantiationException | IllegalArgumentException | IllegalAccessException | InvocationTargetException e) {
        throw new IllegalArgumentException("Could not instantiate class " + className, e);
    }
}