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The Alexa Skills Kit MVC Framework extends the existing ASK SDK, adding features for mapping requests to methods and rendering responses via view scripts and templates such as Nashorn Javascript and Freemarker. It also integrates with the ASK SDK Interaction Model Mapper framework to create a single environment where both the interaction model and business logic of skills can be managed as code packages.

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/*
    Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.

    Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file
    except in compliance with the License. A copy of the License is located at

        http://aws.amazon.com/apache2.0/

    or in the "license" file accompanying this file. This file is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for
    the specific language governing permissions and limitations under the License.
 */

package com.amazon.ask.mvc.mapper.invoke;

import com.amazon.ask.dispatcher.request.handler.HandlerInput;
import com.amazon.ask.dispatcher.request.interceptor.ResponseInterceptor;
import com.amazon.ask.model.Response;
import com.amazon.ask.mvc.mapper.ControllerMethodContext;
import com.amazon.ask.mvc.plugin.ArgumentResolver;
import com.amazon.ask.mvc.mapper.ArgumentResolverContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Objects;
import java.util.Optional;

import static com.amazon.ask.util.ValidationUtils.assertNotNull;

/**
 * A {@link ResponseInterceptor} that encapsulates a method's reflective information
 * and a list of {@link ArgumentResolver}s, which are used to resolve arguments and
 * invoke the method as an interceptor.
 *
 * Implements equals and hashCode to enable de-duplication.
 *
 * @see ControllerMethodContext
 * @see MethodInvoker#invoke(HandlerInput, ControllerMethodContext, ArgumentResolver...)
 */
public class ResponseInterceptorMethod implements ResponseInterceptor {
    protected final Logger logger = LoggerFactory.getLogger(getClass());

    protected final ControllerMethodContext context;
    protected final MethodInvoker invoker;

    public ResponseInterceptorMethod(ControllerMethodContext context, MethodInvoker invoker) {
        this.context = assertNotNull(context, "context");
        this.invoker = invoker == null ? MethodInvoker.getInstance() : invoker;
    }

    @Override
    public void process(HandlerInput input, Optional response) {
        ArgumentResolver responseResolver = context ->
            context.parameterTypeIsAssignableFrom(Response.class)
                ? Optional.of(response.orElse(null))
                : Optional.empty();

        try {
            invoker.invoke(input, context, responseResolver);
        } catch (Exception ex) {
            logger.error(String.format("[%s] Failed to invoke response interceptor: %s",
                input.getRequestEnvelope().getRequest().getRequestId(), context), ex);
            throw new RuntimeException(ex);
        }
    }

    public ControllerMethodContext getContext() {
        return context;
    }

    public MethodInvoker getInvoker() {
        return invoker;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        ResponseInterceptorMethod that = (ResponseInterceptorMethod) o;
        return Objects.equals(context, that.context) &&
            Objects.equals(invoker, that.invoker);
    }

    @Override
    public int hashCode() {
        return Objects.hash(context, invoker);
    }

    public static Builder builder() {
        return new Builder();
    }

    public static final class Builder {
        private ControllerMethodContext context;
        private MethodInvoker invoker;

        private Builder() {
        }

        public Builder withContext(ControllerMethodContext context) {
            this.context = context;
            return this;
        }

        public Builder withInvoker(MethodInvoker invoker) {
            this.invoker = invoker;
            return this;
        }

        public ResponseInterceptorMethod build() {
            return new ResponseInterceptorMethod(context, invoker);
        }
    }
}