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A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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/*
 * Copyright (c) 2011, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jersey.server.model;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CancellationException;
import java.util.concurrent.CompletionStage;
import java.util.function.BiConsumer;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;

import jakarta.ws.rs.ProcessingException;
import jakarta.ws.rs.container.ContainerRequestFilter;
import jakarta.ws.rs.container.ContainerResponseFilter;
import jakarta.ws.rs.container.DynamicFeature;
import jakarta.ws.rs.container.ResourceInfo;
import jakarta.ws.rs.core.Configuration;
import jakarta.ws.rs.core.MultivaluedHashMap;
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.core.Response;
import jakarta.ws.rs.ext.ReaderInterceptor;
import jakarta.ws.rs.ext.WriterInterceptor;

import org.glassfish.jersey.internal.inject.AbstractBinder;
import org.glassfish.jersey.internal.inject.InjectionManager;
import org.glassfish.jersey.internal.inject.Injections;
import org.glassfish.jersey.internal.inject.Providers;
import org.glassfish.jersey.model.ContractProvider;
import org.glassfish.jersey.model.NameBound;
import org.glassfish.jersey.model.internal.ComponentBag;
import org.glassfish.jersey.model.internal.RankedComparator;
import org.glassfish.jersey.model.internal.RankedProvider;
import org.glassfish.jersey.process.Inflector;
import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.ContainerResponse;
import org.glassfish.jersey.server.internal.LocalizationMessages;
import org.glassfish.jersey.server.internal.ProcessingProviders;
import org.glassfish.jersey.server.internal.inject.ConfiguredValidator;
import org.glassfish.jersey.server.internal.process.Endpoint;
import org.glassfish.jersey.server.internal.process.RequestProcessingContext;
import org.glassfish.jersey.server.model.internal.ResourceMethodDispatcherFactory;
import org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory;
import org.glassfish.jersey.server.monitoring.RequestEvent;
import org.glassfish.jersey.server.spi.internal.ResourceMethodDispatcher;
import org.glassfish.jersey.server.spi.internal.ResourceMethodInvocationHandlerProvider;

/**
 * Server-side request-response {@link Inflector inflector} for invoking methods
 * of annotation-based resource classes.
 *
 * @author Marek Potociar
 * @author Martin Matula
 */
public class ResourceMethodInvoker implements Endpoint, ResourceInfo {

    private final ResourceMethod method;
    private final Annotation[] methodAnnotations;
    private final Type invocableResponseType;
    private final boolean canUseInvocableResponseType;
    private final ResourceMethodDispatcher dispatcher;
    private final Method resourceMethod;
    private final Class resourceClass;
    private final List> requestFilters = new ArrayList<>();
    private final List> responseFilters = new ArrayList<>();
    private final Iterable readerInterceptors;
    private final Iterable writerInterceptors;

    /**
     * Resource method invoker helper.
     * 

     * The builder API provides means for constructing a properly initialized
     * {@link ResourceMethodInvoker resource method invoker} instances.
     */
    public static class Builder {

        private ResourceMethodDispatcherFactory resourceMethodDispatcherFactory;
        private ResourceMethodInvocationHandlerFactory resourceMethodInvocationHandlerFactory;
        private InjectionManager injectionManager;
        private Configuration configuration;
        private Supplier configurationValidator;

        /**
         * Set resource method dispatcher factory.
         *
         * @param resourceMethodDispatcherFactory resource method dispatcher factory.
         * @return updated builder.
         */
        public Builder resourceMethodDispatcherFactory(ResourceMethodDispatcherFactory resourceMethodDispatcherFactory) {
            this.resourceMethodDispatcherFactory = resourceMethodDispatcherFactory;
            return this;
        }

        /**
         * Set resource method invocation handler factory.
         *
         * @param resourceMethodInvocationHandlerFactory resource method invocation handler factory.
         * @return updated builder.
         */
        public Builder resourceMethodInvocationHandlerFactory(
                ResourceMethodInvocationHandlerFactory resourceMethodInvocationHandlerFactory) {
            this.resourceMethodInvocationHandlerFactory = resourceMethodInvocationHandlerFactory;
            return this;
        }

        /**
         * Set runtime DI injection manager.
         *
         * @param injectionManager DI injection manager.
         * @return updated builder.
         */
        public Builder injectionManager(InjectionManager injectionManager) {
            this.injectionManager = injectionManager;
            return this;
        }

        /**
         * Set global configuration.
         *
         * @param configuration global configuration.
         * @return updated builder.
         */
        public Builder configuration(Configuration configuration) {
            this.configuration = configuration;
            return this;
        }

        /**
         * Set global configuration validator.
         *
         * @param configurationValidator configuration validator.
         * @return updated builder.
         */
        public Builder configurationValidator(Supplier configurationValidator) {
            this.configurationValidator = configurationValidator;
            return this;
        }

        /**
         * Build a new resource method invoker instance.
         *
         * @param method              resource method model.
         * @param processingProviders Processing providers.
         * @return new resource method invoker instance.
         */
        public ResourceMethodInvoker build(ResourceMethod method, ProcessingProviders processingProviders) {
            if (resourceMethodDispatcherFactory == null) {
                throw new NullPointerException("ResourceMethodDispatcherFactory is not set.");
            }
            if (resourceMethodInvocationHandlerFactory == null) {
                throw new NullPointerException("ResourceMethodInvocationHandlerFactory is not set.");
            }
            if (injectionManager == null) {
                throw new NullPointerException("DI injection manager is not set.");
            }
            if (configuration == null) {
                throw new NullPointerException("Configuration is not set.");
            }
            if (configurationValidator == null) {
                throw new NullPointerException("Configuration validator is not set.");
            }

            return new ResourceMethodInvoker(
                    resourceMethodDispatcherFactory,
                    resourceMethodInvocationHandlerFactory,
                    method,
                    processingProviders, injectionManager,
                    configuration,
                    configurationValidator.get());
        }
    }

    private ResourceMethodInvoker(
            final ResourceMethodDispatcher.Provider dispatcherProvider,
            final ResourceMethodInvocationHandlerProvider invocationHandlerProvider,
            final ResourceMethod method,
            final ProcessingProviders processingProviders,
            InjectionManager injectionManager,
            final Configuration globalConfig,
            final ConfiguredValidator validator) {


        this.method = method;
        final Invocable invocable = method.getInvocable();
        this.dispatcher = dispatcherProvider.create(invocable,
                invocationHandlerProvider.create(invocable), validator);

        this.resourceMethod = invocable.getHandlingMethod();
        this.resourceClass = invocable.getHandler().getHandlerClass();

        // Configure dynamic features.
        final ResourceMethodConfig config = new ResourceMethodConfig(globalConfig.getProperties());
        for (final DynamicFeature dynamicFeature : processingProviders.getDynamicFeatures()) {
            dynamicFeature.configure(this, config);
        }

        final ComponentBag componentBag = config.getComponentBag();
        final List providers = new ArrayList<>(
                componentBag.getInstances(ComponentBag.excludeMetaProviders(injectionManager)));

        // Get instances of providers.
        final Set> providerClasses = componentBag.getClasses(ComponentBag.excludeMetaProviders(injectionManager));
        if (!providerClasses.isEmpty()) {
            injectionManager = Injections.createInjectionManager(injectionManager);
            injectionManager.register(new AbstractBinder() {
                @Override
                protected void configure() {
                    bind(config).to(Configuration.class);
                }
            });

            for (final Class providerClass : providerClasses) {
                providers.add(injectionManager.createAndInitialize(providerClass));
            }
        }

        final List> _readerInterceptors = new LinkedList<>();
        final List> _writerInterceptors = new LinkedList<>();
        final List> _requestFilters = new LinkedList<>();
        final List> _responseFilters = new LinkedList<>();

        for (final Object provider : providers) {
            final ContractProvider model = componentBag.getModel(provider.getClass());
            final Set> contracts = model.getContracts();

            if (contracts.contains(WriterInterceptor.class)) {
                _writerInterceptors.add(
                        new RankedProvider<>(
                                (WriterInterceptor) provider,
                                model.getPriority(WriterInterceptor.class)));
            }

            if (contracts.contains(ReaderInterceptor.class)) {
                _readerInterceptors.add(
                        new RankedProvider<>(
                                (ReaderInterceptor) provider,
                                model.getPriority(ReaderInterceptor.class)));
            }

            if (contracts.contains(ContainerRequestFilter.class)) {
                _requestFilters.add(
                        new RankedProvider<>(
                                (ContainerRequestFilter) provider,
                                model.getPriority(ContainerRequestFilter.class)));
            }

            if (contracts.contains(ContainerResponseFilter.class)) {
                _responseFilters.add(
                        new RankedProvider<>(
                                (ContainerResponseFilter) provider,
                                model.getPriority(ContainerResponseFilter.class)));
            }
        }

        _readerInterceptors.addAll(
                StreamSupport.stream(processingProviders.getGlobalReaderInterceptors().spliterator(), false)
                             .collect(Collectors.toList()));
        _writerInterceptors.addAll(
                StreamSupport.stream(processingProviders.getGlobalWriterInterceptors().spliterator(), false)
                             .collect(Collectors.toList()));

        if (resourceMethod != null) {
            addNameBoundFiltersAndInterceptors(
                    processingProviders,
                    _requestFilters, _responseFilters, _readerInterceptors, _writerInterceptors,
                    method);
        }

        this.readerInterceptors = Collections.unmodifiableList(StreamSupport.stream(Providers.sortRankedProviders(
                new RankedComparator<>(), _readerInterceptors).spliterator(), false).collect(Collectors.toList()));
        this.writerInterceptors = Collections.unmodifiableList(StreamSupport.stream(Providers.sortRankedProviders(
                new RankedComparator<>(), _writerInterceptors).spliterator(), false).collect(Collectors.toList()));
        this.requestFilters.addAll(_requestFilters);
        this.responseFilters.addAll(_responseFilters);

        // pre-compute & cache invocation properties
        this.methodAnnotations = invocable.getHandlingMethod().getDeclaredAnnotations();
        this.invocableResponseType = invocable.getResponseType();
        this.canUseInvocableResponseType = invocableResponseType != null
                && Void.TYPE != invocableResponseType
                && Void.class != invocableResponseType
                && // Do NOT change the entity type for Response or it's subclasses.
                !((invocableResponseType instanceof Class) && Response.class.isAssignableFrom((Class) invocableResponseType));

    }

    private  void addNameBoundProviders(
            final Collection> targetCollection,
            final NameBound nameBound,
            final MultivaluedMap, RankedProvider> nameBoundProviders,
            final MultivaluedMap, Class> nameBoundProvidersInverse) {

        final MultivaluedMap, Class> foundBindingsMap = new MultivaluedHashMap<>();
        for (final Class nameBinding : nameBound.getNameBindings()) {
            final Iterable> providers = nameBoundProviders.get(nameBinding);
            if (providers != null) {
                for (final RankedProvider provider : providers) {
                    foundBindingsMap.add(provider, nameBinding);
                }
            }
        }

        for (final Map.Entry, List>> entry : foundBindingsMap.entrySet()) {
            final RankedProvider provider = entry.getKey();
            final List> foundBindings = entry.getValue();
            final List> providerBindings = nameBoundProvidersInverse.get(provider);
            if (foundBindings.size() == providerBindings.size()) {
                targetCollection.add(provider);
            }
        }
    }

    private void addNameBoundFiltersAndInterceptors(
            final ProcessingProviders processingProviders,
            final Collection> targetRequestFilters,
            final Collection> targetResponseFilters,
            final Collection> targetReaderInterceptors,
            final Collection> targetWriterInterceptors,
            final NameBound nameBound
    ) {
        addNameBoundProviders(targetRequestFilters, nameBound, processingProviders.getNameBoundRequestFilters(),
                processingProviders.getNameBoundRequestFiltersInverse());
        addNameBoundProviders(targetResponseFilters, nameBound, processingProviders.getNameBoundResponseFilters(),
                processingProviders.getNameBoundResponseFiltersInverse());
        addNameBoundProviders(targetReaderInterceptors, nameBound, processingProviders.getNameBoundReaderInterceptors(),
                processingProviders.getNameBoundReaderInterceptorsInverse());
        addNameBoundProviders(targetWriterInterceptors, nameBound, processingProviders.getNameBoundWriterInterceptors(),
                processingProviders.getNameBoundWriterInterceptorsInverse());
    }


    @Override
    public Method getResourceMethod() {
        return resourceMethod;
    }

    @Override
    public Class getResourceClass() {
        return resourceClass;
    }

    @Override
    @SuppressWarnings("unchecked")
    public ContainerResponse apply(final RequestProcessingContext processingContext) {
        final ContainerRequest request = processingContext.request();
        final Object resource = processingContext.routingContext().peekMatchedResource();

        if (method.isSuspendDeclared() || method.isManagedAsyncDeclared() || method.isSse()) {
            if (!processingContext.asyncContext().suspend()) {
                throw new ProcessingException(LocalizationMessages.ERROR_SUSPENDING_ASYNC_REQUEST());
            }
        }

        if (method.isManagedAsyncDeclared()) {
            processingContext.asyncContext().invokeManaged(() -> {
                final Response response = invoke(processingContext, resource);
                if (method.isSuspendDeclared()) {
                    // we ignore any response returned from a method that injects AsyncResponse
                    return null;
                }
                return response;
            });
            return null; // return null on current thread
        } else {
            // TODO replace with processing context factory method.
            Response response = invoke(processingContext, resource);

            // we don't care about the response when SseEventSink is injected - it will be sent asynchronously.
            if (method.isSse()) {
                return null;
            }

            if (response.hasEntity()) {
                Object entityFuture = response.getEntity();
                if (entityFuture instanceof CompletionStage) {
                    CompletionStage completionStage = ((CompletionStage) entityFuture);

                    // suspend - we know that this feature is not done, see AbstractJavaResourceMethodDispatcher#invoke
                    if (!processingContext.asyncContext().suspend()) {
                        throw new ProcessingException(LocalizationMessages.ERROR_SUSPENDING_ASYNC_REQUEST());
                    }

                    // wait for a response
                    completionStage.whenComplete(whenComplete(processingContext));

                    return null; // return null on the current thread
                }
            }

            return new ContainerResponse(request, response);
        }
    }

    private BiConsumer whenComplete(RequestProcessingContext processingContext) {
        return (entity, exception) -> {

            if (exception != null) {
                if (exception instanceof CancellationException) {
                    processingContext.asyncContext().resume(Response.status(Response.Status.SERVICE_UNAVAILABLE).build());
                } else {
                    processingContext.asyncContext().resume(((Throwable) exception));
                }
            } else {
                processingContext.asyncContext().resume(entity);
            }
        };
    }

    private Response invoke(final RequestProcessingContext context, final Object resource) {

        Response jaxrsResponse;
        context.triggerEvent(RequestEvent.Type.RESOURCE_METHOD_START);

        context.push(response -> {
            // Need to check whether the response is null or mapped from exception. In these cases we don't want to modify
            // response with resource method metadata.
            if (response == null
                    || response.isMappedFromException()) {
                return response;
            }

            final Annotation[] entityAnn = response.getEntityAnnotations();
            if (methodAnnotations.length > 0) {
                if (entityAnn.length == 0) {
                    response.setEntityAnnotations(methodAnnotations);
                } else {
                    final Annotation[] mergedAnn = Arrays.copyOf(methodAnnotations,
                            methodAnnotations.length + entityAnn.length);
                    System.arraycopy(entityAnn, 0, mergedAnn, methodAnnotations.length, entityAnn.length);
                    response.setEntityAnnotations(mergedAnn);
                }
            }

            if (canUseInvocableResponseType
                    && response.hasEntity()
                    && !(response.getEntityType() instanceof ParameterizedType)) {
                response.setEntityType(invocableResponseType);
            }

            return response;
        });

        try {
            jaxrsResponse = dispatcher.dispatch(resource, context.request());
        } finally {
            context.triggerEvent(RequestEvent.Type.RESOURCE_METHOD_FINISHED);
        }

        if (jaxrsResponse == null) {
            jaxrsResponse = Response.noContent().build();
        }

        return jaxrsResponse;
    }

    /**
     * Get all bound request filters applicable to the {@link #getResourceMethod() resource method}
     * wrapped by this invoker.
     *
     * @return All bound (dynamically or by name) request filters applicable to the {@link #getResourceMethod() resource
     * method}.
     */
    public Iterable> getRequestFilters() {
        return requestFilters;
    }

    /**
     * Get all bound response filters applicable to the {@link #getResourceMethod() resource method}
     * wrapped by this invoker.
     *
     * @return All bound (dynamically or by name) response filters applicable to the {@link #getResourceMethod() resource
     * method}.
     */
    public Iterable> getResponseFilters() {
        return responseFilters;
    }

    /**
     * Get all reader interceptors applicable to the {@link #getResourceMethod() resource method}
     * wrapped by this invoker.
     *
     * @return All reader interceptors applicable to the {@link #getResourceMethod() resource method}.
     */
    public Iterable getWriterInterceptors() {
        return writerInterceptors;
    }

    /**
     * Get all writer interceptors applicable to the {@link #getResourceMethod() resource method}
     * wrapped by this invoker.
     *
     * @return All writer interceptors applicable to the {@link #getResourceMethod() resource method}.
     */
    public Iterable getReaderInterceptors() {
        return readerInterceptors;
    }

    @Override
    public String toString() {
        return method.getInvocable().getHandlingMethod().toString();
    }
}
 















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