spring-boot-rest/libraries/src/main/java/com/baeldung/flink/schema/InputMessageDeserializationSchema.java

package com.baeldung.flink.schema;

import com.baeldung.flink.model.InputMessage;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import org.apache.flink.api.common.serialization.DeserializationSchema;
import org.apache.flink.api.common.typeinfo.TypeInformation;

import java.io.IOException;

public class InputMessageDeserializationSchema implements
      DeserializationSchema<InputMessage> {

    ObjectMapper objectMapper;

    @Override
    public InputMessage deserialize(byte[] bytes) throws IOException {
        if(objectMapper == null) {
            objectMapper = new ObjectMapper().registerModule(new JavaTimeModule());
        }
        return objectMapper.readValue(bytes, InputMessage.class);
    }

    @Override
    public boolean isEndOfStream(InputMessage inputMessage) {
        return false;
    }

    @Override
    public TypeInformation<InputMessage> getProducedType() {
        return TypeInformation.of(InputMessage.class);
    }
}