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Full Discussion: How to block first bash script until second bash script script launches web server/site?
Top Forums Shell Programming and Scripting How to block first bash script until second bash script script launches web server/site? Post 303027204 by siegfried on Monday 10th of December 2018 09:05:57 PM
Old 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 MOJAVE

schemagen

schemagen(1)						      General Commands Manual						      schemagen(1)

NAME

       schemagen - Java(TM) Architecture for XML Binding Schema Generator Specification Version: 2.0
       Reference Implementation (RI) Version: 2.0 ea3

   Launching schemagen
       The schema generator can be launched using the appropriate schemagen shell script in the bin directory for your platform.

       The current schema generator can process either Java source files or class files.

       We also provide an Ant task to run the schema generator - see the instructions for using schemagen with Ant.

	  For Solaris/Linux

		% path/to/jaxb/bin/schemagen.sh Foo.java Bar.java ...
		Note: Writing schema1.xsd

	  For WindowsNT/2000/XP

		> path	ojaxbinschemagen.bat Foo.java Bar.java ...
		Note: Writing schema1.xsd

       If your java sources/classes reference other classes, they must be accessable on your system CLASSPATH environment variable, or they need
       to be given to the tool by using the -classpath/-cp options. Otherwise you will see errors when generating your schema.

	  Command Line Options

	     Usage: schemagen [-options ...] <java files>

	     Options:
		 -d <path>	   :  Specify where to place processor and javac generated class files
		 -cp <path>	   :  Specify where to find user specified files
		 -classpath <path> :  Specify where to find user specified files
		 -help		   :  Display this usage message

   Generated Resource Files
       The current schema generator simply creates a schema file for each namespace referenced in your Java classes. There is no way to control
       the name of the generated schema files at this time. For that purpose, use the schema generator ant task.

See Also
	  o JAXB 2.0:

	     * Release Notes @
	       http://java.sun.com/webservices/docs/2.0/jaxb/ReleaseNotes.html

	     * XJC @
	       http://java.sun.com/webservices/docs/2.0/jaxb/xjc.html

	     * XJCTask @
	       http://java.sun.com/webservices/docs/2.0/jaxb/xjcTask.html

	     * SchemaGen @
	       http://java.sun.com/webservices/docs/2.0/jaxb/schemagen.html

	     * schemagenTask @
	       http://java.sun.com/webservices/docs/2.0/jaxb/schemagenTask.html

	     * Sample Apps @
	       http://java.sun.com/webservices/docs/2.0/jaxb/samples.html

	     * Changelog @
	       http://java.sun.com/webservices/docs/2.0/jaxb/changelog2.html

	  o JAXB 1.0.x:

	     * Release Notes @
	       http://java.sun.com/webservices/docs/2.0/jaxb/jaxb-1_0.html

	     * Changelog @
	       http://java.sun.com/webservices/docs/2.0/jaxb/changelog.html

	  o JAXB RI Extensions:

	     * Runtime Properties @
	       http://java.sun.com/webservices/docs/2.0/jaxb/vendorProperties.html

	     * XJC Customizations @
	       http://java.sun.com/webservices/docs/2.0/jaxb/vendorCustomizations.html

	     * Develop Plugins @
	       http://java.sun.com/webservices/docs/2.0/jaxb/developPlugins.html

	  o JAXB RI Schema Languages:

	     * W3C XML Schema @
	       http://java.sun.com/webservices/docs/2.0/jaxb/vendorSchemaLangs.html#xschema

	     * RELAX NG @
	       http://java.sun.com/webservices/docs/2.0/jaxb/vendorSchemaLangs.html#relaxng

	     * DTD @
	       http://java.sun.com/webservices/docs/2.0/jaxb/vendorSchemaLangs.html#dtd

	  o JAXB Community:

	     * Java.net Homepage @
	       http://jaxb.dev.java.net

	     * Developer interest list @
	       https://jaxb.dev.java.net/servlets/ProjectMailingListList

	     * FAQ @
	       https://jaxb.dev.java.net/faq/index.html

								    07 Aug 2006 						      schemagen(1)
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