# Axis2HttpTransportListener.java

    /*
     *  Copyright (c) 2022, 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.transport.netty.listener;

    import org.apache.axis2.AxisFault;
    import org.apache.axis2.addressing.EndpointReference;
    import org.apache.axis2.context.ConfigurationContext;
    import org.apache.axis2.context.MessageContext;
    import org.apache.axis2.context.SessionContext;
    import org.apache.axis2.description.TransportInDescription;
    import org.apache.axis2.transport.TransportListener;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.synapse.commons.handlers.MessagingHandler;
    import org.apache.synapse.transport.http.conn.Scheme;
    import org.apache.synapse.transport.netty.BridgeConstants;
    import org.apache.synapse.transport.netty.config.SourceConfiguration;
    import org.apache.synapse.transport.netty.util.RequestResponseUtils;
    import org.wso2.transport.http.netty.contract.HttpWsConnectorFactory;
    import org.wso2.transport.http.netty.contract.ServerConnector;
    import org.wso2.transport.http.netty.contract.ServerConnectorFuture;
    import org.wso2.transport.http.netty.contract.config.ListenerConfiguration;
    import org.wso2.transport.http.netty.contract.config.ServerBootstrapConfiguration;
    import org.wso2.transport.http.netty.contractimpl.DefaultHttpWsConnectorFactory;

    import java.util.HashMap;
    import java.util.List;

    /**
     * {@code Axis2HttpTransportListener} is the Axis2 Transport Listener implementation for HTTP transport based on Netty.
     */
    public class Axis2HttpTransportListener implements TransportListener {

        private static final Log LOG = LogFactory.getLog(Axis2HttpTransportListener.class);

        private ServerConnector serverConnector;
        private HttpWsConnectorFactory httpWsConnectorFactory;
        protected SourceConfiguration sourceConfiguration = null;
        protected List<MessagingHandler> messagingHandlers;
        protected TransportInDescription transportInDescription;

        @Override
        public void init(ConfigurationContext configurationContext, TransportInDescription transportInDescription)
                throws AxisFault {

            Scheme scheme = initScheme();
            this.transportInDescription = transportInDescription;

            // build source configuration
            sourceConfiguration = new SourceConfiguration(configurationContext, transportInDescription, scheme,
                    messagingHandlers);
            sourceConfiguration.build();

            sourceConfiguration.getHttpGetRequestProcessor().init(sourceConfiguration.getConfigurationContext());

            ListenerConfiguration listenerConfiguration = initListenerConfiguration();

            httpWsConnectorFactory = new DefaultHttpWsConnectorFactory();
            this.serverConnector = httpWsConnectorFactory
                    .createServerConnector(new ServerBootstrapConfiguration(new HashMap<>()), listenerConfiguration);
        }

        @Override
        public void start() throws AxisFault {
            ServerConnectorFuture serverConnectorFuture = serverConnector.start();
            serverConnectorFuture.setHttpConnectorListener(new Axis2HttpConnectorListener(sourceConfiguration));
            if (LOG.isDebugEnabled()) {
                if (BridgeConstants.HTTP_2_0_VERSION.equals(sourceConfiguration.getProtocol())) {
                    LOG.debug("HTTP/2 server is started on port " + sourceConfiguration.getPort());
                } else {
                    LOG.debug("HTTP/1.1 server is started on port " + sourceConfiguration.getPort());
                }
            }
            try {
                serverConnectorFuture.sync();
            } catch (InterruptedException e) {
                LOG.warn("Interrupted while waiting for server connector to start", e);
            }
        }

        @Override
        public void stop() throws AxisFault {
            LOG.info("Stopping " + transportInDescription.getName() + " Listener..");
            serverConnector.stop();
            try {
                httpWsConnectorFactory.shutdown();
            } catch (InterruptedException e) {
                LOG.error("Error occurred while shutting down the listener..", e);
            }
        }

        @Override
        public EndpointReference getEPRForService(String s, String s1) {
            return null;
        }

        @Override
        public EndpointReference[] getEPRsForService(String s, String s1) {
            return new EndpointReference[0];
        }

        @Override
        public SessionContext getSessionContext(MessageContext messageContext) {
            return null;
        }

        @Override
        public void destroy() {
            LOG.info("Destroying " + transportInDescription.getName() + " Listener..");
        }

        protected Scheme initScheme() {
            return new Scheme("http", 80, false);
        }

        protected ListenerConfiguration initListenerConfiguration()
                throws AxisFault {
            return RequestResponseUtils.getListenerConfig(sourceConfiguration, false);
        }

        public void setMessagingHandlers(List<MessagingHandler> messagingHandlers) {

            this.messagingHandlers = messagingHandlers;
        }
    }