com.google.cloud.spring.pubsub.support.converter.JacksonPubSubMessageConverter Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of spring-cloud-gcp-pubsub Show documentation

Spring Framework on Google Cloud Pub/Sub Module

The newest version!

/*
 * Copyright 2017-2018 the original author or authors.
 *
 * 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.google.cloud.spring.pubsub.support.converter;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.protobuf.ByteString;
import com.google.pubsub.v1.PubsubMessage;
import java.io.IOException;
import java.util.Map;
import org.springframework.util.Assert;

/** A converter using Jackson JSON. */
public class JacksonPubSubMessageConverter implements PubSubMessageConverter {

  private final ObjectMapper objectMapper;

  /**
   * Constructor.
   *
   * @param objectMapper the object mapper used to create and read JSON.
   */
  public JacksonPubSubMessageConverter(ObjectMapper objectMapper) {
    Assert.notNull(objectMapper, "A valid ObjectMapper is required.");
    this.objectMapper = objectMapper;
  }

  @Override
  public PubsubMessage toPubSubMessage(Object payload, Map headers) {
    try {
      return byteStringToPubSubMessage(
          ByteString.copyFrom(this.objectMapper.writeValueAsBytes(payload)), headers);
    } catch (JsonProcessingException ex) {
      throw new PubSubMessageConversionException(
          "JSON serialization of an object of type " + payload.getClass().getName() + " failed.",
          ex);
    }
  }

  @Override
  public  T fromPubSubMessage(PubsubMessage message, Class payloadType) {
    try {
      return (T)
          this.objectMapper.readerFor(payloadType).readValue(message.getData().toByteArray());
    } catch (IOException ex) {
      throw new PubSubMessageConversionException(
          "JSON deserialization of an object of type " + payloadType.getName() + " failed.", ex);
    }
  }
}