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/*
 * Copyright (c) 2021-2023 Sonu Kumar
 *
 * Licensed 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
 *
 *     https://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 com.github.sonus21.rqueue.converter;

import static org.springframework.util.Assert.notNull;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.github.sonus21.rqueue.utils.SerializationUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.converter.MappingJackson2MessageConverter;
import org.springframework.messaging.converter.MessageConverter;
import org.springframework.messaging.support.GenericMessage;

/**
 * JsonMessageConverter tries to convert to JSON and from JSON to object.
 *
 * 

Message converter relies on target class information to deserialize JSON to object. If it * finds target class is null then it returns the null. * *

Target class is null till the time method arguments are not resolved, once method arguments * are resolved then it will become non-null. * * @see MappingJackson2MessageConverter */ @Slf4j public class JsonMessageConverter implements MessageConverter { private final ObjectMapper objectMapper; public JsonMessageConverter() { this.objectMapper = SerializationUtils.createObjectMapper(); } public JsonMessageConverter(ObjectMapper objectMapper) { notNull(objectMapper, "objectMapper cannot be null"); this.objectMapper = objectMapper; } @Override public Object fromMessage(Message message, Class targetClass) { log.trace("Message: {} TargetClass: {}", message.getPayload(), targetClass); try { String payload = (String) message.getPayload(); if (targetClass == null) { return null; } if (SerializationUtils.isJson(payload)) { return objectMapper.readValue(payload, targetClass); } return null; } catch (JsonProcessingException | ClassCastException e) { log.debug("Deserialization of message {} failed", message, e); return null; } } @Override public Message toMessage(Object payload, MessageHeaders headers) { log.trace("Payload: {} Headers: {}", payload, headers); try { String msg = objectMapper.writeValueAsString(payload); return new GenericMessage<>(msg); } catch (JsonProcessingException e) { log.debug("Serialisation failed, Payload: {}", payload, e); return null; } } }





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