ObjectInputStream/OutputStream buffering?

[Knute Johnson]

Are ObjectInputStream and ObjectOutputStream buffered? Normally if you
use a BufferedInputStream it is the last stream class in the list. Can
you put a BufferedInputStream between the InputStream and
ObjectInputStream and realize any performance improvement?

Thanks,

 

[petersprc]

These are not buffered, so using a BufferedStream may be useful if
doing a large amount of I/O.

(Note, when creating an ObjectOutputStream:
"callers may wish to flush the stream immediately to ensure that
constructors for receiving ObjectInputStreams will not block when
reading the header.")

(In certain edge cases, you may want to flush the ObjectOutputStream,
see

 

[Knute Johnson]

These are not buffered, so using a BufferedStream may be useful if
doing a large amount of I/O.

(Note, when creating an ObjectOutputStream:
"callers may wish to flush the stream immediately to ensure that
constructors for receiving ObjectInputStreams will not block when
reading the header.")

(In certain edge cases, you may want to flush the ObjectOutputStream,
see

Are ObjectInputStream and ObjectOutputStream buffered? Normally if you
use a BufferedInputStream it is the last stream class in the list. Can
you put a BufferedInputStream between the InputStream and
ObjectInputStream and realize any performance improvement?

Thanks,

I tried it with a file and it does improve the I/O considerable but
where I really wanted to use it was with some network I/O. When the
input side was buffered it didn't read all of the data and hung. That
turns out not to be where my problem was anyway so I put it back to
unbuffered. Thanks for the post.

 

[Esmond Pitt]

I tried it with a file and it does improve the I/O considerable but
where I really wanted to use it was with some network I/O. When the
input side was buffered it didn't read all of the data and hung. That
turns out not to be where my problem was anyway so I put it back to
unbuffered.

Buffering on a network is still a good idea. The problem you had was
that the other end wasn't flushing at the appropriate times.

 

[petersprc]

Yeah, as Esmond says, the issue seems to be the case considered in
this report:

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4337145

Flushing after creating the ObjectOutputStream might do the trick.

 

[Knute Johnson]

Yeah, as Esmond says, the issue seems to be the case considered in
this report:

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4337145

Flushing after creating the ObjectOutputStream might do the trick.

That could have been the problem, I'll have to play with is some more.

Thanks,