Delete symbol in exchange-core

[shanhashcah]

Hi:

Is there any class to delete the existing symbol in exchange core. Actually here we have BatchAddSymbolsCommand class through we can add symbol dynamically but how to delete that symbol dynamically? I am search through the code but not getting something like. Pls help me.

Thanks

[shanhashcah]

Hi @mzheravin

Pls give me some hints to get out of this issue.

Many Thanks

[esanchezros]

Not as far as I know but you can fork the code and add a new command to remove symbols

[shanhashcah]

Hi @esanchezros

Thanks for your response. In BatchAddSymbolsCommand, we put the CoreSymbolSpecification object as value and symbolId as key in IntObjectHashMap . After that, SerializationUtils.marshallIntHashMap method which is serialize the IntObjectHashMap object.

So now If I try to create BatchDeleteSymbols command to delete the created symbol how would I get that object. I mean the key-pair which was stored in IntObjectHashMap. This is the issue.

Many Thanks

[shanhashcah]

Hi @mzheravin Sir / @esanchezros Sir:

             Whatever I have figured out that symbol is stored as byte format through WriteBytesMarshallable. So how  to read that byte and get the symbol back.

Thanks

[shanhashcah]

@mzheravin Sir ,
Pls help, so that I can add a new feature to the existing system. So we can delete the symbol dynamically.

[esanchezros]

Hey @shanhashcah,

Not sure if the repo is maintained any longer but adding this functionality yourself should not be difficult.

Have a look at

exchange-core/src/main/java/exchange/core2/core/processors/MatchingEngineRouter.java

Line 218 in 2f85487

private void handleBinaryMessage(Object message) {

where the BatchAddSymbolsCommand is processed. You need to do something similar, adding a BatchDeleteSymbolsCommand which will delete the order book by symbolId

[shanhashcah]

Hi @esanchezros Sir,

Thanks for your reply.


              I am trying to create a class like below, what I need to add inside writeMarshallable method . Is it correct or doing something wrong.

@AllArgsConstructor
@EqualsAndHashCode
@getter
public final class BatchDeleteSymbolsCommand implements BinaryDataCommand {

 private  IntObjectHashMap<Integer> symbols;

 public BatchDeleteSymbolsCommand(final int symbol) {
	 symbols = IntObjectHashMap.newWithKeysValues(symbol, symbol);
 }


@Override
public void writeMarshallable(BytesOut<?> bytes) throws IllegalStateException, BufferOverflowException,
		BufferUnderflowException, IllegalArgumentException, ArithmeticException {
	// TODO Auto-generated method stub
	
}

@Override
public int getBinaryCommandTypeCode() {
	// TODO Auto-generated method stub
	return BinaryCommandType.DELETE_SYMBOLS.getCode();
}

}

[esanchezros]

Not sure if you need to implement writeMarshallable, it may be the same as BatchAddSymbolsCommand