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Posted to dev@mina.apache.org by Yogs <ym...@gemstone.com> on 2007/04/05 11:19:42 UTC

way to extract a java object from a MINA byte buffer?

Hi 

I have prototype for latency measurements, in which I have a blocking stream
based client and server based on MINA. When client sends handshake data,
which is really a java object, I get a Byte buffer on the server but I don’t
how to extract a java object from that byte buffer. I tried using
buffer.asInputStream() and buffer.getObject(), but both of them are not
working for me , and throws Exceptions such as StreamCorruptedException and
BufferUnderFlowException respectively.

Do u have any idea what is the correct way to extract a java object from a
MINA byte buffer?


Thanks in Advance.


Regards,
Yogs

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Re: way to extract a java object from a MINA byte buffer?

Posted by Yogs <ym...@gemstone.com>.

Thanks a ton Trustin, once again.

I am not supposed to modify the client code, but seems that this is the only
way to do it, as stream has two ends , and one nedds to consider for both
ends.

Thanks a lot !!!


Regards,
Yogs



Trustin Lee wrote:
> 
> Hi Yogs,
> 
> On 4/5/07, Yogs <ym...@gemstone.com> wrote:
>>
>> Hi
>>
>> I have prototype for latency measurements, in which I have a blocking
>> stream
>> based client and server based on MINA. When client sends handshake data,
>> which is really a java object, I get a Byte buffer on the server but I
>> don't
>> how to extract a java object from that byte buffer. I tried using
>> buffer.asInputStream() and buffer.getObject(), but both of them are not
>> working for me , and throws Exceptions such as StreamCorruptedException
>> and
>> BufferUnderFlowException respectively.
>>
>> Do u have any idea what is the correct way to extract a java object from
>> a
>> MINA byte buffer?
> 
> You will have to modify your client to write a Java object using
> ObjectSerializationOutputStream and read using
> ObjectSerializationInputStream instead of ObjectInput/OutputStream.
> These stream classes are located in
> org.apache.mina.filter.codec.serialization package.  Object I/O
> streams are designed to be suitable for blocking streams, so we
> couldn't make it usable for non-blocking I/O.  Objects written with
> ObjectSerializationOutputStream also can be read via
> ByteBuffer.getObject().
> 
> HTH,
> Trustin
> -- 
> what we call human nature is actually human habit
> --
> http://gleamynode.net/
> --
> PGP Key ID: 0x0255ECA6
> 
> 

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Re: way to extract a java object from a MINA byte buffer?

Posted by Trustin Lee <tr...@gmail.com>.

Hi Yogs,

On 4/5/07, Yogs <ym...@gemstone.com> wrote:
>
> Hi
>
> I have prototype for latency measurements, in which I have a blocking stream
> based client and server based on MINA. When client sends handshake data,
> which is really a java object, I get a Byte buffer on the server but I don't
> how to extract a java object from that byte buffer. I tried using
> buffer.asInputStream() and buffer.getObject(), but both of them are not
> working for me , and throws Exceptions such as StreamCorruptedException and
> BufferUnderFlowException respectively.
>
> Do u have any idea what is the correct way to extract a java object from a
> MINA byte buffer?

You will have to modify your client to write a Java object using
ObjectSerializationOutputStream and read using
ObjectSerializationInputStream instead of ObjectInput/OutputStream.
These stream classes are located in
org.apache.mina.filter.codec.serialization package.  Object I/O
streams are designed to be suitable for blocking streams, so we
couldn't make it usable for non-blocking I/O.  Objects written with
ObjectSerializationOutputStream also can be read via
ByteBuffer.getObject().

HTH,
Trustin
-- 
what we call human nature is actually human habit
--
http://gleamynode.net/
--
PGP Key ID: 0x0255ECA6