com.illumon.iris.sbetransport.client.messages

Class FixedWidthColumnDataDecoder

java.lang.Object

com.illumon.iris.sbetransport.client.messages.FixedWidthColumnDataDecoder

public class FixedWidthColumnDataDecoder
extends Object

A utility class to decode column data updates with a fixed width (ie primitive types). The SBE codegen does not support specifying common interfaces, but because every SBE decoder for fixed-width data shares the same methods, we can use reflection to extract those methods and write the decoding logic in one place.

Constructor Summary

Constructors

Constructor and Description
FixedWidthColumnDataDecoder(Class decoderClass, Function<Object,Object> objMapper) Create a new fixed width column data decoder using the given SBE decoder class.

Method Summary

Modifier and Type	Method and Description
int	decode(Object decoder, org.agrona.concurrent.UnsafeBuffer directBuffer, int bufferOffset, int actingBlockLength, int actingVersion, long[] rowIndexes, Object[] dataBuffer, List<SimpleMessageHandlerListener> listenerList) Decode a fixed-width column data update message and pass along to any interested listeners.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FixedWidthColumnDataDecoder

public FixedWidthColumnDataDecoder(Class decoderClass,
                                   Function<Object,Object> objMapper)

Create a new fixed width column data decoder using the given SBE decoder class.

Parameters:

decoderClass - Decoder class to wrap

objMapper - Function to map a raw decoded value to an alternate type for notification

Method Detail

decode

public int decode(Object decoder,
                  org.agrona.concurrent.UnsafeBuffer directBuffer,
                  int bufferOffset,
                  int actingBlockLength,
                  int actingVersion,
                  long[] rowIndexes,
                  Object[] dataBuffer,
                  List<SimpleMessageHandlerListener> listenerList)

Decode a fixed-width column data update message and pass along to any interested listeners.

Parameters:

decoder - Decoder which can be used to extract the message from from the given buffer

directBuffer - The underlying receive buffer

bufferOffset - The offset in the given buffer at which to start decoding

actingBlockLength - Block length from SBE header (pass to decoder wrap method)

actingVersion - Version from SBE header (pass to decoder wrap method)

rowIndexes - Array in which to write affected row indexes

dataBuffer - Array in which to write the updated data (corresponding to the row indexes)

listenerList - Listeners to notify

Returns:

Number of affected rows