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From "Isuru Eranga Suriarachchi (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AXIS2-4731) Inefficient inputstream reading in JSONDataSource
Date Mon, 10 Jan 2011 14:05:46 GMT

     [ https://issues.apache.org/jira/browse/AXIS2-4731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Isuru Eranga Suriarachchi resolved AXIS2-4731.
----------------------------------------------

       Resolution: Fixed
    Fix Version/s: 1.6

Applied the improvement proposed by Jean..

Thanks,
~Isuru

> Inefficient inputstream reading in JSONDataSource
> -------------------------------------------------
>
>                 Key: AXIS2-4731
>                 URL: https://issues.apache.org/jira/browse/AXIS2-4731
>             Project: Axis2
>          Issue Type: Sub-task
>          Components: modules
>    Affects Versions: 1.5.1
>            Reporter: Jean Marc
>            Assignee: Isuru Eranga Suriarachchi
>             Fix For: 1.6
>
>
> I am experiencing 100% CPU on InputStream.read() on 30Kb json data from JSONDataSource.
> Using InputStream.read() is highly inefficient since we don't know the size of the JSON
data; 
> a reasonably-sized char buffer should be used to cut down on CPU and to lower the method
calls on StringBuilder.append(). 
> Note also that regardless of the solution, there must be a charset conversion between
an InputStream and a Reader (or a String object for that matter), and that the cast between
int and char in the old code will corrupt an InputStream containing multibyte characters.
Since JSON data is usually sent in UTF-8, we could hardcode the conversion in the InputStreamReader
to overcome problems on Windows: 
>             BufferedReader in = new BufferedReader(new InputStreamReader(jsonInputStream,"UTF-8"));
>             StringBuilder sb = new StringBuilder(512); 
>             char[] tempBuf = new char[512];
>             int readLen = -1;
>             
>             while( (readLen = in.read(tempBuf)) != -1 )
>                 sb.append(tempBuf,0, readLen);
>              tempBuf = null;

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