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SpecificAvroDeserializer.java
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SpecificAvroDeserializer.java
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package de.melsicon.kafka.serde.confluent;
import io.confluent.kafka.serializers.KafkaAvroDeserializer;
import io.confluent.kafka.serializers.KafkaAvroDeserializerConfig;
import java.util.HashMap;
import java.util.Map;
import org.apache.avro.Schema;
import org.apache.avro.specific.SpecificRecord;
import org.apache.kafka.common.errors.SerializationException;
import org.apache.kafka.common.serialization.Deserializer;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;
public final class SpecificAvroDeserializer<T extends SpecificRecord> implements Deserializer<T> {
private final Class<T> type;
private final Schema schema;
private final KafkaAvroDeserializer inner;
public SpecificAvroDeserializer(Class<T> type) {
this.type = type;
this.schema = schemaForClass(type);
this.inner = new KafkaAvroDeserializer();
}
private static <T extends SpecificRecord> Schema schemaForClass(Class<T> type) {
T t;
try {
t = type.getDeclaredConstructor().newInstance();
} catch (ReflectiveOperationException e) {
throw new SerializationException("Can't read schema from class " + type.getName(), e);
}
return t.getSchema();
}
@Override
@SuppressWarnings("nullness:override.param")
public void configure(
@Nullable Map<String, ? extends @NonNull Object> deserializerConfig, boolean isDeserializerForRecordKeys) {
Map<String, Object> specificAvroEnabledConfig =
deserializerConfig == null
? new HashMap<>()
: new HashMap<>(deserializerConfig);
specificAvroEnabledConfig.put(KafkaAvroDeserializerConfig.SPECIFIC_AVRO_READER_CONFIG, true);
inner.configure(specificAvroEnabledConfig, isDeserializerForRecordKeys);
}
@Override
@SuppressWarnings({
"nullness:argument",
"nullness:override.return"
}) // Deserializer and KafkaAvroDeserializer are not annotated
public @Nullable T deserialize(String topic, byte @Nullable [] bytes) {
return type.cast(inner.deserialize(topic, bytes, schema));
}
@Override
public void close() {
inner.close();
}
}