composing wrapped bytebuffers

Question

composing wrapped bytebuffers

Navgeet opened this issue 11 years ago · comments

ReadMe says wrapped bytebuffers are to be composed as

(compose-buffer my-spec :buffer (java.nio.ByteBuffer/allocate 14)

Reading the code suggest it should instead be

(compose-buffer my-spec :orig-buffer (java.nio.ByteBuffer/allocate 14)

Trying this out throws: No matching field found: wrappedBuffer for class java.nio.HeapByteBuffer

Alex Petrov · Answer 1 · Mon Jan 20 2014 06:41:46 GMT+0800 (China Standard Time)

Thanks for reporting it. Would you like to submit a pull request?

Navgeet Agrawal · Answer 2 · Mon Jan 20 2014 06:45:51 GMT+0800 (China Standard Time)

Could do it, but I have no idea was clojurewerkz.buffy.core/set-writer-index does. It makes use of writerIndex method for a ByteBuffer, which doesn't seem to exist.

Alex Petrov · Answer 3 · Mon Jan 20 2014 06:49:24 GMT+0800 (China Standard Time)

True. That's a method from ByteBuf from Netty... So we need to wrap a ByteBuffer into ByteBuf first, and set writer index only after that.

We need writer index mostly because otherwise Netty won't return correct buffer when writing back to socket for example