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MQSeries.net Forum Index » IBM MQ Java / JMS » JMSBytesMessage

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joecherian
PostPosted: Sun Dec 15, 2002 7:41 pm    Post subject: JMSBytesMessage Reply with quote

Novice

Joined: 15 Dec 2002
Posts: 23
Location: India
Hello..

I got a small doubt..

I created a JMSBytesMessage object using the call

JMSBytesMessage ByteMsg = (JMSBytesMessage)session.createBytesMessage()

then i read one message object from the queue using the call

ByteMsg = Queuereceiver.recieve()

now is it possible for me to know how many bytes are present in this
BytesMessage object so that i can allocate a byte array for reading all
the
data in to this byte array ?

Please help

Thanks

Joe Cherian
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kingdon
PostPosted: Mon Dec 16, 2002 12:54 am    Post subject: Reply with quote

Acolyte

Joined: 14 Jan 2002
Posts: 63
Location: UK
The bad news:
no - it was something of an oversight from the JMS 1.0.2 spec.
The good news:
a call has been added to the JMS 1.1 spec for this purpose.

Until then, I'm afraid you have to choose between a few different work arounds:
a) Use fixed length messages
b) Use a different message type
c) Use a user property to carry the size of the message body
d) guess the buffer size, loop until the number of bytes read is less than the size of the buffer provided (implying an extra level of array copy operations to build the output array you really want)

(Yes, I know a, b and even c are likely to be inapplicable in some situations.)

Regards,
James.
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