com.partnersoft.io.net
Class WebGuppyServer

java.lang.Object
  com.partnersoft.io.net.WebGuppyServer

All Implemented Interfaces:

GuppyConstants

public class WebGuppyServer
extends java.lang.Object
implements GuppyConstants

HTTP-based Guppy update server implementation in Java. Guppy is a simplified implementation of the rsync algorithms. It is not compatible with the standard rsync. This is a fairly peculiar usage of the cgi protocol. I am using it as a way to avoid using a custom socket daemon, however in general it behaves more like a socket daemon than a standard cgi-bin program. We're taking the PUT data (which comes in STDIN), processing it and sending the results to STDOUT. The PUT data consists of a gzipped, binary Guppy conversation. The client will ask for directory tree listings, and provide rsync-style block checksums for files that it wants to update. This program then returns the needed data to update those files to match the server copy, again using rsync algorithms. The result is not ideal; it doesn't seem possible to write to STDOUT while reading from STDIN, for example; on the client side whenever I open the input stream it terminates the output stream. I'm not sure if that's a limitation in HTTP, Java, or somewhere else. To allow for arbitrarily-sized inputs I spool them off to an tempfile, then read it back in so I can output while processing. So, the result is inefficient in time, since it causes a burst of uploaded data, followed by a burst of downloaded data, with no overlap to take advantage of full-duplex links. However it should be fairly efficient in bytes transferred.

Author:

Paul Reavis Copyright 2004 Partner Software, Inc.

Field Summary

Fields inherited from interface com.partnersoft.io.net.GuppyConstants

BLOCKSIZE, BUFFERSIZE, GZIP, OP_DIFF_FILE, OP_EOF, OP_EOT, OP_EXISTING_BLOCKS, OP_FILE_DIFFS, OP_FILE_LISTING, OP_LIST_FILES, OP_MD5, OP_MESSAGE, OP_NAMES, OP_NEW_BYTES, OP_NULL

Constructor Summary

WebGuppyServer()

Method Summary

static void

main(java.lang.String[] argv)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WebGuppyServer

public WebGuppyServer()

Method Detail

main

public static void main(java.lang.String[] argv)