12-10-2018
How to block first bash script until second bash script script launches web server/site?
I'm new to utilities like socat and netcat and I'm not clear if they will do what I need.
I have a "compileDeployStartWebServer.sh" script and a "StartBrowser.sh" script that are started by emacs/elisp at the same time in two different processes.
I'm using Cygwin bash on Windows 10.
My compileDeployStartWebServer.sh compiles the java code and starts the web server on port 8080.
Presently, the "StartBrowser.sh" sleeps for 40 seconds and launches a browser like Chrome or Firefox while the "compileDeployStartWebServer.sh" downloads any dependencies using maven or gradle, compiles the code and starts the web server. This takes a while!
So my plan was to enhance the java startup code in the web site to write "starting" to a UDP socket on port 7777. Alternatively, the java startup code could spawn a new child thread to write "starting" to a TCP socket so it the web site startup code won't block on the TCP socket in case I decide to run without the "StartBrowser.sh" script.
So is there a way to enhance the "StartBrowser.sh" to block on the TCP (or UDP) socket instead of sleeping? I could write some more java code, I suppose.
What would you recommend? UDP? TCP? What could I use to block the "StartBrowser.sh" (besides more custom java code) while the other script is busy downloading dependencies, compiling, deploying and starting the web server? flock?, exec? netcat? socat? something else?
Perhaps I should be using mutexes or semaphores instead? I don't think java has good support for these features, however.
Thanks
Siegfried
Last edited by siegfried; 12-10-2018 at 10:25 PM..
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LEARN ABOUT DEBIAN
simplyhtml
SIMPLYHTML(1) General Commands Manual SIMPLYHTML(1)
NAME
simplyhtml -- A Java editor based on HTML and CSS.
SYNOPSIS
simplyhtml [no_options]
DESCRIPTION
This manual page documents briefly the simplyhtml command.
This manual page was written for the Debian distribution because the original program does not have a manual page. Instead, it has online
documentation (see Help menu in SimplyHTML).
Project Description
With project SimplyHTML an application is built for working with text documents. Text documents are stored in HTML and CSS format, but the
application is meant as a word processor rather than a code editor or web site builder.
Open to the maximum
SimplyHTML is built with the aim to document as much of its functionality and usage as possible. The application is written in Java and
distributed with full source codes.
By using Java, HTML, CSS and PDF all parts of the project are 100% platform independent and can be used on almost any machine.
Extensive documentation
Source codes are commented in Javadoc format and additional inline comments. The sources are created with good legibility and structure in
mind.
In addition, an extensive tutorial is delivered covering both usage of the application and its internals. The tutorial is available in
JavaHelp format and can be used as online help out of SimplyHTML. Or it can be read with a plain web browser. A PDF version of the tutorial
is avalable too.
Why another HTML editor?
SimplyHTML is not an HTML editor in first place. It is a text processing application being based on HTML and CSS files.
Although it has a simple HTML editor built in as well, the application focuses on text processing rather than web page creation.
SimplyHTML tries to distinguish from comparable applications by combining simplicity, ease of use and transparency for both users and
developers.
OPTIONS
This program does not have any option. Just start it!
ENVIRONMENT VARIABLES
DEBUG If this environment variable is set, SimplyHTML gives more information on how it finds its different elements, as well as some
other information.
JAVACMD Default value for the java virtual machine (the java command).
JAVA_BINDIR
If $JAVACMD is not set, the java virtual machine is searched under $JAVA_BINDIR/java.
JAVA_HOME If $JAVACMD and $JAVA_BINDIR are not set, the java virtual machine is searched under $JAVA_HOME/bin/java.
PATH If all $JAVA... environment variables fail, the java virtual machine command (java) is searched in the $PATH (with which).
CLASSPATH ADD_JARS
The $CLASSPATH variable also lets one specify additional jars, which is good, if you want to add a new Look&Feel jar (the motif
one is so ugly...). Alternatively, the content of $ADD_JARS will be prepended to $CLASSPATH.
FILES
/usr/bin/java
If all searches through environment variables fail, the java virtual machine is expected to be /usr/bin/java; if not, simplyhtml
exits with an error.
SEE ALSO
The online documentation under http://simplyhtml.sf.net/, especially the Linux related one under the Wiki page link http://simply-
html.sourceforge.net/wiki/index.php/SimplyHTML_on_Linux.
AUTHOR
This manual page was written by Eric Lavarde deb@zorglub.s.bawue.de for the Debian system (but may be used by others). Permission is
granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version pub-
lished by the Free Software Foundation.
On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.
SIMPLYHTML(1)