# HttpResponseProcessHandler.java

    /*
     * Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
     *
     * WSO2 Inc. licenses this file to you under the Apache License,
     * Version 2.0 (the "License"); you may not use this file except
     * in compliance with the License.
     * You may obtain a copy of the License at
     *
     * http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing,
     * software distributed under the License 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 org.apache.synapse.commons.emulator.http.producer;

    import io.netty.buffer.ByteBuf;
    import io.netty.channel.ChannelHandlerContext;
    import io.netty.channel.ChannelInboundHandlerAdapter;
    import io.netty.handler.codec.http.HttpContent;
    import io.netty.handler.codec.http.HttpResponse;
    import io.netty.handler.codec.http.LastHttpContent;
    import org.apache.synapse.commons.emulator.http.dsl.dto.producer.OutgoingMessage;

    public class HttpResponseProcessHandler extends ChannelInboundHandlerAdapter {
        private HttpResponseContext responseContext;
        private HttpResponseInformationProcessor responseInformationProcessor;
        private HttpResponseAssertProcessor responseAssertProcessor;
        private OutgoingMessage outgoingMessage;

        public HttpResponseProcessHandler(OutgoingMessage outgoingMessage) {
            this.outgoingMessage = outgoingMessage;
        }

        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) {
            if (msg instanceof HttpResponse) {
                this.responseContext = new HttpResponseContext();
                this.responseInformationProcessor = new HttpResponseInformationProcessor();
                this.responseAssertProcessor = new HttpResponseAssertProcessor();
                HttpResponse response = (HttpResponse) msg;
                responseInformationProcessor.process(response, responseContext);
            }

            if (msg instanceof HttpContent) {
                HttpContent httpContent = (HttpContent) msg;
                ByteBuf content = httpContent.content();

                if (content.isReadable()) {
                    this.responseInformationProcessor.appendDecoderResult(responseContext, httpContent, content);
                }

                if (content instanceof LastHttpContent) {
                    ctx.fireChannelReadComplete();
                }
            }
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
            cause.printStackTrace();
            ctx.close();
        }

        @Override
        public void channelReadComplete(ChannelHandlerContext ctx) {
            if (responseAssertProcessor != null) {
                this.responseAssertProcessor.process(responseContext, outgoingMessage);
            }
            ctx.close();
        }
    }