I have observed that implementations of the method serialize() of the Serializer<> interface has two parameters:
byte[] serialize(String topic, T data)
but the method body does not require String topic parameter at all. So why does it exist?
Sample Implementation available in the package org.apache.kafka.common.serialization:
@Override
public byte[] serialize(String topic, String data) {
try {
if (data == null)
return null;
else
return data.getBytes(encoding);
} catch (UnsupportedEncodingException e) {
throw new SerializationException("Error when serializing string to byte[] due to unsupported encoding " + encoding);
}
}
In this specific implementation, indeed there's no usage. Yet, this parameter may be used by different / advanced Serializers.
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