Beefy Boxes and Bandwidth Generously Provided by pair Networks
Come for the quick hacks, stay for the epiphanies.
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
As a simplification, you may want to think of the processing of network data the same way as reading a file while some other process is writing to it.

You cannot determine without some protocol when a "block" of data is complete. The common solutions to this problem are:

a) the above mentioned "end of block" marker. In the case of a line-based protocol, the newline character serves as an end-of-block marker. This is especially useful if its inefficient to know the length of a block in advance (usually, because the block is large and takes a long time to compute). And line-based protocols are just nice to read for humans, which can also be a big help in analyzing any problems.

b) prefix the block with its length. HTTP for instance provides a mechanism for this using the content-length header. Many binary protocols work the same way. When possible, this gives a few advantages over end-of-block markers; the client will know how much memory to allocate for the incoming data, and it can make it easier to pass the data on without any additional processing.


In reply to Re: How can I determine the server is waiting for input in POE::Wheel::ReadWrite? by Joost
in thread How can I determine the server is waiting for input in POE::Wheel::ReadWrite? by woosley

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others goofing around in the Monastery: (7)
As of 2024-04-13 15:42 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found