Examples with DeserializationContext org.codehaus.jackson.map.DeserializationContext used on opensource projects

Example 1 with DeserializationContext

use of org.codehaus.jackson.map.DeserializationContext in project samza by apache.

the class SamzaObjectMapper method getObjectMapper.

/**
   * @return Returns a new ObjectMapper that's been configured to (de)serialize
   *         Samza's job data model, and simple data types such as TaskName,
   *         Partition, Config, and SystemStreamPartition.
   */
public static ObjectMapper getObjectMapper() {
    ObjectMapper mapper = new ObjectMapper();
    SimpleModule module = new SimpleModule("SamzaModule", new Version(1, 0, 0, ""));
    // Setup custom serdes for simple data types.
    module.addSerializer(Partition.class, new PartitionSerializer());
    module.addSerializer(SystemStreamPartition.class, new SystemStreamPartitionSerializer());
    module.addKeySerializer(SystemStreamPartition.class, new SystemStreamPartitionKeySerializer());
    module.addSerializer(TaskName.class, new TaskNameSerializer());
    module.addDeserializer(Partition.class, new PartitionDeserializer());
    module.addDeserializer(SystemStreamPartition.class, new SystemStreamPartitionDeserializer());
    module.addKeyDeserializer(SystemStreamPartition.class, new SystemStreamPartitionKeyDeserializer());
    module.addDeserializer(Config.class, new ConfigDeserializer());
    // Setup mixins for data models.
    mapper.getSerializationConfig().addMixInAnnotations(TaskModel.class, JsonTaskModelMixIn.class);
    mapper.getDeserializationConfig().addMixInAnnotations(TaskModel.class, JsonTaskModelMixIn.class);
    mapper.getSerializationConfig().addMixInAnnotations(ContainerModel.class, JsonContainerModelMixIn.class);
    mapper.getSerializationConfig().addMixInAnnotations(JobModel.class, JsonJobModelMixIn.class);
    mapper.getDeserializationConfig().addMixInAnnotations(JobModel.class, JsonJobModelMixIn.class);
    module.addDeserializer(ContainerModel.class, new JsonDeserializer<ContainerModel>() {

        @Override
        public ContainerModel deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
            ObjectCodec oc = jp.getCodec();
            JsonNode node = oc.readTree(jp);
            int containerId = node.get("container-id").getIntValue();
            if (node.get("container-id") == null) {
                throw new SamzaException("JobModel did not contain a container-id. This can never happen. JobModel corrupt!");
            }
            String processorId;
            if (node.get("processor-id") == null) {
                processorId = String.valueOf(containerId);
            } else {
                processorId = node.get("processor-id").getTextValue();
            }
            Map<TaskName, TaskModel> tasksMapping = OBJECT_MAPPER.readValue(node.get("tasks"), new TypeReference<Map<TaskName, TaskModel>>() {
            });
            return new ContainerModel(processorId, containerId, tasksMapping);
        }
    });
    // Convert camel case to hyphenated field names, and register the module.
    mapper.setPropertyNamingStrategy(new CamelCaseToDashesStrategy());
    mapper.registerModule(module);
    return mapper;
}