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From "Steffen Pingel (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HTTPCORE-43) Implement support for FileChannel#transferFrom and FileChannel#transferTo
Date Thu, 19 Apr 2007 22:08:15 GMT

    [ https://issues.apache.org/jira/browse/HTTPCORE-43?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12490185
] 

Steffen Pingel commented on HTTPCORE-43:
----------------------------------------

I have similar requirements performance requirements and would like to avoid buffering in
NHttpServiceHandler but write directly to the channel (at least when LengthDelimitedEncoder
is used). I am suggesting a new interface for entities that are tailored for NIO (so far I
have only implemented this for writing):

public interface HttpNIOEntity extends HttpEntity {

    void produceContent(ContentEncoder encoder) throws IOException;

}

My custom service handler invokes entity.produceContent() in outputReady() in case of HttpNIOEntity
objects and uses buffering for other entities. This also opens the possibility for IO control
in entities. I am asynchronously reading chunks of a file to avoid blocking the NIO thread
and use the content encoder to suspend output if reading from disk is slower than the writing
network:

public interface ContentEncoder extends IOControl {
...
}


> Implement support for FileChannel#transferFrom and FileChannel#transferTo
> -------------------------------------------------------------------------
>
>                 Key: HTTPCORE-43
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-43
>             Project: HttpComponents Core
>          Issue Type: Improvement
>          Components: HttpCore
>            Reporter: Oleg Kalnichevski
>             Fix For: 4.0-alpha5
>
>
> Implement optional support for FileChannel#transferFrom and FileChannel#transferTo operations.
Direct coping from and to FileChannel is believed to result in a significant performance improvement
for file bound operations 

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