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Jersey core server implementation
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package org.glassfish.jersey.server.model.internal;

import java.lang.reflect.InvocationHandler;

import javax.ws.rs.ProcessingException;
import javax.ws.rs.container.ResourceContext;
import javax.ws.rs.core.Response;

import javax.inject.Singleton;

import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.internal.inject.ConfiguredValidator;
import org.glassfish.jersey.server.model.Invocable;
import org.glassfish.jersey.server.spi.internal.ResourceMethodDispatcher;

/**
 * Specific resource method dispatcher for dispatching requests to a void
 * {@link java.lang.reflect.Method Java method} with no input arguments
 * using a supplied {@link InvocationHandler Java method invocation handler}.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 */
@Singleton
final class VoidVoidDispatcherProvider implements ResourceMethodDispatcher.Provider {

    private final ResourceContext resourceContext;

    VoidVoidDispatcherProvider(ResourceContext resourceContext) {
        this.resourceContext = resourceContext;
    }

    private static class VoidToVoidDispatcher extends AbstractJavaResourceMethodDispatcher {

        private VoidToVoidDispatcher(final Invocable resourceMethod,
                                     final InvocationHandler handler,
                                     final ConfiguredValidator validator) {
            super(resourceMethod, handler, validator);
        }

        @Override
        public Response doDispatch(final Object resource, final ContainerRequest containerRequest) throws ProcessingException {
            invoke(containerRequest, resource);
            return Response.noContent().build();
        }
    }

    @Override
    public ResourceMethodDispatcher create(final Invocable resourceMethod,
                                           final InvocationHandler handler,
                                           final ConfiguredValidator validator) {
        if (resourceMethod.getHandlingMethod().getReturnType() != void.class || !resourceMethod.getParameters().isEmpty()) {
            return null;
        }

        return resourceContext.initResource(new VoidToVoidDispatcher(resourceMethod, handler, validator));
    }
}