ChronicleQueue - how to read custom object from tailer

Question

I am very new to ChronicleQueue and I am unable to find a straight forward example of how can I read back my custom object from a tailer.

public class MyData extends AbstractMarshallable

I have my class containing some strings and numbers, I am able to write to queue using appender, but there is no straight forward api to call. how can i get a object of MyData from tailer.readDocument api?

Mark Price · Accepted Answer · 2018-02-19T11:02:26.647

1

Try with below code:

final DocumentContext context = queue.createTailer().readingDocument();
final MyData container = new MyData();
if (context.isPresent()) {
    context.wire().getValueIn().marshallable(container);
}

this assumes that appending is performed in the following manner:

try (DocumentContext ctx = appender.writingDocument()) {
    ctx.wire().getValueOut().marshallable(myData);
}

edited Feb 19 '18 at 11:02

answered Feb 19 '18 at 08:14

Mark Price

296
1
3

Thanks, Very close i guess, but i get this now, on this line "context.wire().getValueIn().marshallable(container);" net.openhft.chronicle.core.io.IORuntimeException: Length unknown – Sathish Kumar Feb 19 '18 at 10:13
btw, I am writing it like this: appender.writeDocument(myData); – Sathish Kumar Feb 19 '18 at 10:19
Sorry, do you have an example fragment of what you mean by symmetric? – Sathish Kumar Feb 19 '18 at 11:15

ChronicleQueue - how to read custom object from tailer

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