Write Nested interface with Direct Reference

[side cap]

Hello,

I take a simple nested interface example:

interface MyInterface extends Byteable{
    byte getByte();
    void setByte(byte t);

    MyNestedInterface getObject();
    void setObject(MyNestedInterface t);

    interface MyNestedInterface extends Byteable{
        double getTrade();
        void setTrade(double p);
    }
}

How to: ?

Chronicle chronicle = ChronicleQueueBuilder.vanilla("C:\\").build();
ExcerptAppender appender = chronicle.createAppender();
final MyInterface event = DataValueClasses.newDirectReference(MyInterface.class);

appender.startExcerpt(event.maxSize());
event.bytes(appender, 0);

event.setByte((byte) 7);
event.setObject(?????????????); // How to put an object of type MyNestedInterface ?

appender.position(event.maxSize()); 
// if we didnt want to write event.setObject(...) then appender.position should be appender.position(size of one byte)
// bacause only used event.setByte((byte) 7); ???
appender.finish();
chronicle.close();

Best Regards,

[Peter Lawrey]

You can create another object to set it however a simpler approach is to do

MyNestedInterface mni = event.getObject();

mni.setTrade(price);

otherwise you can do the following if the interface didn't extend Byteable.

MyNestedInterface mni = DataValueClasses.newHeapInstance(MyNestedInterface.class);

mni.setTrade(price);

event.setObject(mni);

At the moment we don't guarentee that the one byte will be the first one.

If you are going to use the byte as a message type I suggest doing this seperately.

appender.startExcerpt();

appender.writeUnsignedByte(MyNestedInterface.CODE);

((Byteable) mni).bytes(appender, appender.position());

mni.setTrade(price);

appender.skip(8);

appender.finish();

You might it is simpler to not use the intermediate data type in this case.

public void writeTrade(double price) {

    appender.startExcerpt();

    appender.writeUnsignedByte(MessageTypes.TRADE);

    appender.writeDouble(price);

    appender.finish();

}

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