Re: [jgroups-dev] Streamable

It is mainly an ease of use issue. We just upgraded from 2.8.1 and our
2.6.x code logged some of the messages and sends some down a TCP stream
for distant clients of the group. The old Message (< 2.8.1) was
Externalizable. If you made Streamable use DataInput and DataOutput, you
could make Message also be Externalizable and just forward
Externalizable.readExternal and Externalizable.writeExternal to
Streamable.readFrom and Streamable.writeTo since ObjectInput and
ObjectOutput extend from DataInput and DataOutput.

 

We may change this in the future, but I figured that using DataInput and
DataOutput is probably a good idea anyway.

 

I saw that in Util as well, because I was just going to make a local mod
myself to see if it was that easy, then saw all those. I checked some of
the Util calls and I don't think they use any of the Stream methods, but
I did not do an exhaustive search.

 

From: Vladimir Blagojevic [mailto:[email protected]] 
Sent: Thursday, May 20, 2010 2:49 PM
To: Newcomb, Michael-P57487
Cc: jg-dev
Subject: Re: [jgroups-dev] Streamable

 

Yes, it seems doable. In fact I tried it. The only minor problem are
casts in Util#objectFromStream and Util#objectToStream where we have to
cast parameter DataInputStream into InputStream and DataOutputStram into
OutputStream respectively.

 

Lets see what Bela says about this.

 

Any specific reason you need this change?

 

 

 

 

On 2010-05-20, at 11:17 AM, Newcomb, Michael-P57487 wrote:





Can you make Streamable use DataInput and DataOutput instead of
DataInputStream and DataOutputStream? I think you would only lose
flush() and size() from DataOutputStream.

 

Thanks,

Michael

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Vladimir Blagojevic

JBoss Clustering Team

JBoss by Red Hat

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