components/camel-soroush/src/main/java/org/apache/camel/component/soroushbot/component/SoroushBotSendMessageProducer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.camel.component.soroushbot.component;

import java.io.IOException;

import javax.ws.rs.ProcessingException;
import javax.ws.rs.client.Entity;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.camel.Exchange;
import org.apache.camel.component.soroushbot.models.SoroushAction;
import org.apache.camel.component.soroushbot.models.SoroushMessage;
import org.apache.camel.component.soroushbot.service.SoroushService;
import org.apache.camel.component.soroushbot.utils.MaximumConnectionRetryReachedException;
import org.apache.camel.component.soroushbot.utils.SoroushException;
import org.apache.camel.support.DefaultProducer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.apache.camel.component.soroushbot.utils.StringUtils.ordinal;

/**
 * this Producer is responsible for URIs of type {@link SoroushAction#sendMessage}
 * to send message to SoroushAPI.
 * it will be instantiated for URIs like "soroush:sendMessage/[token]
 */
public class SoroushBotSendMessageProducer extends DefaultProducer {

    private static Logger log = LoggerFactory.getLogger(SoroushBotSendMessageProducer.class);
    SoroushBotEndpoint endpoint;
    ObjectMapper objectMapper = new ObjectMapper();

    public SoroushBotSendMessageProducer(SoroushBotEndpoint endpoint) {
        super(endpoint);
        this.endpoint = endpoint;
    }

    @Override
    public void process(Exchange exchange) throws Exception {
        SoroushMessage message = exchange.getIn().getBody(SoroushMessage.class);
        // if autoUploadFile is true try to upload files inside the message
        if (endpoint.isAutoDownload()) {
            endpoint.handleFileUpload(message);
        }
        sendMessage(message);
    }

    /**
     * @throws MaximumConnectionRetryReachedException if can not connect to soroush after retry {@link SoroushBotEndpoint#getMaxConnectionRetry()} times
     * @throws SoroushException                       if soroush response code wasn't 200
     */
    private void sendMessage(SoroushMessage message) throws SoroushException, MaximumConnectionRetryReachedException, InterruptedException {
        Response response;
        // this for is responsible to handle maximum connection retry.
        for (int count = 0; count <= endpoint.getMaxConnectionRetry(); count++) {
            endpoint.waitBeforeRetry(count);
            try {
                if (log.isDebugEnabled()) {
                    log.debug("sending message for " + ordinal(count + 1) + " time(s). message:" + message);
                }
                response = endpoint.getSendMessageTarget().request(MediaType.APPLICATION_JSON_TYPE)
                        .post(Entity.entity(objectMapper.writeValueAsString(message), MediaType.APPLICATION_JSON_TYPE));
                SoroushService.get().assertSuccessful(response, message);
                return;
            } catch (IOException | ProcessingException ex) {
                if (count == endpoint.getMaxConnectionRetry()) {
                    throw new MaximumConnectionRetryReachedException("failed to send message. maximum retry limit reached. aborting... message: " + message, ex, message);
                }
                if (log.isWarnEnabled()) {
                    log.warn("failed to send message: " + message, ex);
                }

            }
        }
    }

}