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From "Steffen Pingel (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HTTPCORE-78) ExpandableBuffer uses direct byte buffers
Date Thu, 07 Jun 2007 23:05:26 GMT

     [ https://issues.apache.org/jira/browse/HTTPCORE-78?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steffen Pingel updated HTTPCORE-78:
-----------------------------------

    Attachment: httpcore-heap-allocator.patch

Thanks for merging. The attached patch modifies the code to use HeapByteBufferAllocator by
default except for Shared*Buffers.

BTW, is it possible to limit the maximum request URI length and header/request length? I am
concerned that overly large requests would cause the buffers to resized until no more memory
is available or the maximum buffer size of Interger.MAX_VALUE is reached.


> ExpandableBuffer uses direct byte buffers
> -----------------------------------------
>
>                 Key: HTTPCORE-78
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-78
>             Project: HttpComponents Core
>          Issue Type: Improvement
>    Affects Versions: 4.0-alpha4
>            Reporter: Steffen Pingel
>             Fix For: 4.0-alpha5
>
>         Attachments: httpcore-bytebuffer-allocator.patch, httpcore-bytebuffer-allocator.patch,
httpcore-heap-allocator.patch
>
>
> HttpCore allocates subtypes of ExpandleBuffer per connection for buffering requests and
responses. ExpandleBuffer creates a buffer using ByteBuffer.allocateDirect() which is initialized
to a certain size but may be resized as needed requiring the garbage collector to discard
the old buffer. 
> According to the documentation for ByteBuffer, direct buffers are recommended for "large,
long-lived buffers that are subject to the underlying system's native I/O operations". It
seems that these buffers are rather short-lived and ByteBuffer.allocate() might be a better
choice for allocation. 
> Another option would be to pass a factory for allocating and releasing buffers which
could reduce the number of allocations by reusing buffers.

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