Examples with GhostProcessor org.apache.nifi.processor.GhostProcessor used on opensource projects

Example 1 with GhostProcessor

use of org.apache.nifi.processor.GhostProcessor in project nifi by apache.

the class FlowController method createProcessor.

/**
 * <p>
 * Creates a new ProcessorNode with the given type and identifier and
 * optionally initializes it.
 * </p>
 *
 * @param type the fully qualified Processor class name
 * @param id the unique ID of the Processor
 * @param coordinate the bundle coordinate for this processor
 * @param firstTimeAdded whether or not this is the first time this
 * Processor is added to the graph. If {@code true}, will invoke methods
 * annotated with the {@link OnAdded} annotation.
 * @return new processor node
 * @throws NullPointerException if either arg is null
 * @throws ProcessorInstantiationException if the processor cannot be
 * instantiated for any reason
 */
public ProcessorNode createProcessor(final String type, String id, final BundleCoordinate coordinate, final Set<URL> additionalUrls, final boolean firstTimeAdded, final boolean registerLogObserver) throws ProcessorInstantiationException {
    id = id.intern();
    boolean creationSuccessful;
    LoggableComponent<Processor> processor;
    try {
        processor = instantiateProcessor(type, id, coordinate, additionalUrls);
        creationSuccessful = true;
    } catch (final ProcessorInstantiationException pie) {
        LOG.error("Could not create Processor of type " + type + " for ID " + id + "; creating \"Ghost\" implementation", pie);
        final GhostProcessor ghostProc = new GhostProcessor();
        ghostProc.setIdentifier(id);
        ghostProc.setCanonicalClassName(type);
        processor = new LoggableComponent<>(ghostProc, coordinate, null);
        creationSuccessful = false;
    }
    final ComponentVariableRegistry componentVarRegistry = new StandardComponentVariableRegistry(this.variableRegistry);
    final ValidationContextFactory validationContextFactory = new StandardValidationContextFactory(controllerServiceProvider, componentVarRegistry);
    final ProcessorNode procNode;
    if (creationSuccessful) {
        procNode = new StandardProcessorNode(processor, id, validationContextFactory, processScheduler, controllerServiceProvider, nifiProperties, componentVarRegistry, this);
    } else {
        final String simpleClassName = type.contains(".") ? StringUtils.substringAfterLast(type, ".") : type;
        final String componentType = "(Missing) " + simpleClassName;
        procNode = new StandardProcessorNode(processor, id, validationContextFactory, processScheduler, controllerServiceProvider, componentType, type, nifiProperties, componentVarRegistry, this, true);
    }
    final LogRepository logRepository = LogRepositoryFactory.getRepository(id);
    if (registerLogObserver) {
        logRepository.addObserver(StandardProcessorNode.BULLETIN_OBSERVER_ID, LogLevel.WARN, new ProcessorLogObserver(getBulletinRepository(), procNode));
    }
    try {
        final Class<?> procClass = procNode.getProcessor().getClass();
        if (procClass.isAnnotationPresent(DefaultSettings.class)) {
            DefaultSettings ds = procClass.getAnnotation(DefaultSettings.class);
            try {
                procNode.setYieldPeriod(ds.yieldDuration());
            } catch (Throwable ex) {
                LOG.error(String.format("Error while setting yield period from DefaultSettings annotation:%s", ex.getMessage()), ex);
            }
            try {
                procNode.setPenalizationPeriod(ds.penaltyDuration());
            } catch (Throwable ex) {
                LOG.error(String.format("Error while setting penalty duration from DefaultSettings annotation:%s", ex.getMessage()), ex);
            }
            // the caller said to register the log observer, otherwise we could be changing the level when we didn't mean to
            if (registerLogObserver) {
                try {
                    procNode.setBulletinLevel(ds.bulletinLevel());
                } catch (Throwable ex) {
                    LOG.error(String.format("Error while setting bulletin level from DefaultSettings annotation:%s", ex.getMessage()), ex);
                }
            }
        }
    } catch (Throwable ex) {
        LOG.error(String.format("Error while setting default settings from DefaultSettings annotation: %s", ex.getMessage()), ex);
    }
    if (firstTimeAdded) {
        try (final NarCloseable x = NarCloseable.withComponentNarLoader(procNode.getProcessor().getClass(), procNode.getProcessor().getIdentifier())) {
            ReflectionUtils.invokeMethodsWithAnnotation(OnAdded.class, procNode.getProcessor());
        } catch (final Exception e) {
            if (registerLogObserver) {
                logRepository.removeObserver(StandardProcessorNode.BULLETIN_OBSERVER_ID);
            }
            throw new ComponentLifeCycleException("Failed to invoke @OnAdded methods of " + procNode.getProcessor(), e);
        }
        if (firstTimeAdded) {
            try (final NarCloseable nc = NarCloseable.withComponentNarLoader(procNode.getProcessor().getClass(), procNode.getProcessor().getIdentifier())) {
                ReflectionUtils.quietlyInvokeMethodsWithAnnotation(OnConfigurationRestored.class, procNode.getProcessor());
            }
        }
    }
    return procNode;
}