com.github.sonus21.rqueue.converter.JsonMessageConverter Maven / Gradle / Ivy
Show all versions of rqueue-core Show documentation
/*
* 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;
}
}
}