groovy-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Guillaume Laforge <glafo...@gmail.com>
Subject Re: ServerSocket , Chunked data , and BufferedReader
Date Tue, 12 Apr 2016 16:40:34 GMT
Oh and actually, when you do input.withReader { reader -> ... }
this is actually a BufferedReader that Groovy gives you.
So you can use BufferedReader's readLine() method!

On Tue, Apr 12, 2016 at 6:39 PM, Guillaume Laforge <glaforge@gmail.com>
wrote:

> Ah good point.
> Well, it's possible to break out of the eachLine call... by throwing an
> exception, although it makes the code a little less elegant obviously.
>
> On Tue, Apr 12, 2016 at 6:27 PM, Gerald Wiltse <jerrywiltse@gmail.com>
> wrote:
>
>> Thank you for the response!
>>
>> I had it that way when I started.  The problem with using
>> reader.eachLine{}  is there is no way to break out after a specific number
>> of lines have been received (other than using a GroovyRuntimeException,
>> which is undesirable).
>>
>>        Ref:
>> http://stackoverflow.com/questions/9916261/groovy-inputstream-reading-closure-hanging
>> )
>>
>> I was sad to discover that there's an eachLine{} method,  but not a
>> readLine() method on the reader.  In my case (and perhaps many others)
>> readLine() would cut out the need for the construction of the
>> BufferedReader and InputStreamReader.
>>
>>
>>
>> Gerald R. Wiltse
>> jerrywiltse@gmail.com
>>
>>
>> On Tue, Apr 12, 2016 at 12:19 PM, Guillaume Laforge <glaforge@gmail.com>
>> wrote:
>>
>>> You can do an input.withReader { reader -> ... } to have a buffered
>>> reader on the input stream.
>>> And with that reader, you can do reader.eachLine { String s -> ... } to
>>> iterate over all the lines.
>>> Last interesting nugget, there's also the class
>>> groovy.io.LineColumnReader potentially, if you're interested in keeping
>>> track of the position (column and line number) in the file.
>>>
>>> Guillaume
>>>
>>> On Tue, Apr 12, 2016 at 5:53 PM, Gerald Wiltse <jerrywiltse@gmail.com>
>>> wrote:
>>>
>>>> I'm trying to use a "ServerSocket" to receive HTTP messages from a
>>>> client which is POSTing them as chunked.  I just want to capture the text
>>>> content being posted (plain text).  Any input on how to do this better
>>>> would be welcomed.
>>>>
>>>> Here is my existing and very not-elegant solution.  When dealing with
>>>> ServerSocket, one has to handle the headers and chunk barriers manually,
>>>> and this is what I came up with.  I looked at filterline method on the
>>>> reader, maybe that's part of a solution, i'm not sure.
>>>>
>>>>
>>>> socket.withStreams { input, output ->
>>>> BufferedReader reader = new BufferedReader(new InputStreamReader(input))
>>>> while (currentLineCount < processor.newLineCount) {
>>>> line = reader.readLine()
>>>>
>>>> if (line && line.size() > 3) {
>>>> processor.processFormats(line)
>>>> }
>>>> currentLineCount++
>>>> }
>>>> }
>>>>
>>>>
>>>> Caveats:
>>>>
>>>> 1.  I have been trying to process line by line to minimize memory
>>>> impact, rather than buffering the whole collection. I'd like to keep it
>>>> that way.
>>>>
>>>>
>>>> 2.  These 4 Jetty libraries are available on the classpath, so I could
>>>> leverage them, but can't add other libraries.
>>>>
>>>>     compile 'org.eclipse.jetty:jetty-server:8.1.2.v20120308'
>>>>     compile 'org.eclipse.jetty:jetty-continuation:8.1.2.v20120308'
>>>>     compile 'org.eclipse.jetty:jetty-io:8.1.2.v20120308'
>>>>     compile 'org.eclipse.jetty:jetty-util:8.1.2.v20120308'
>>>>
>>>> I would make the Service and Handler in Jetty, but I can't find any
>>>> good examples that fit my situation.
>>>>
>>>>
>>>>
>>>>
>>>> Gerald R. Wiltse
>>>> jerrywiltse@gmail.com
>>>>
>>>>
>>>
>>>
>>> --
>>> Guillaume Laforge
>>> Apache Groovy committer & PMC Vice-President
>>> Product Ninja & Advocate at Restlet <http://restlet.com>
>>>
>>> Blog: http://glaforge.appspot.com/
>>> Social: @glaforge <http://twitter.com/glaforge> / Google+
>>> <https://plus.google.com/u/0/114130972232398734985/posts>
>>>
>>
>>
>
>
> --
> Guillaume Laforge
> Apache Groovy committer & PMC Vice-President
> Product Ninja & Advocate at Restlet <http://restlet.com>
>
> Blog: http://glaforge.appspot.com/
> Social: @glaforge <http://twitter.com/glaforge> / Google+
> <https://plus.google.com/u/0/114130972232398734985/posts>
>



-- 
Guillaume Laforge
Apache Groovy committer & PMC Vice-President
Product Ninja & Advocate at Restlet <http://restlet.com>

Blog: http://glaforge.appspot.com/
Social: @glaforge <http://twitter.com/glaforge> / Google+
<https://plus.google.com/u/0/114130972232398734985/posts>

Mime
View raw message