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Apache::TestTrace(3)  User Contributed Perl Documentation Apache::TestTrace(3)

NAME
       Apache::TestTrace - Helper output generation functions

SYNOPSIS
	   use Apache::TestTrace;

	   debug "foo bar";

	   info_sub "missed it";

	   error_mark "something is wrong";

	   # test sub that exercises all the tracing functions
	   sub test {
	       print $Apache::TestTrace::LogFH
		     "TraceLevel: $Apache::TestTrace::Level\n";
	       $_->($_,[1..3],$_) for qw(emerg alert crit error
					 warning notice info debug todo);
	       print $Apache::TestTrace::LogFH "\n\n"
	   };

	   # demo the trace subs using default setting
	   test();

	   {
	       # override the default trace level with 'crit'
	       local $Apache::TestTrace::Level = 'crit';
	       # now only 'crit' and higher levels will do tracing lower level
	       test();
	   }

	   {
	       # set the trace level to 'debug'
	       local $Apache::TestTrace::Level = 'debug';
	       # now only 'debug' and higher levels will do tracing lower level
	       test();
	   }

	   {
	       open OUT, ">/tmp/foo" or die $!;
	       # override the default Log filehandle
	       local $Apache::TestTrace::LogFH = \*OUT;
	       # now the traces will go into a new filehandle
	       test();
	       close OUT;
	   }

	   # override tracing level via -trace opt
	   % t/TEST -trace=debug

	   # override tracing level via env var
	   % env APACHE_TEST_TRACE_LEVEL=debug t/TEST

DESCRIPTION
       This module exports a number of functions that make it easier
       generating various diagnostics messages in your programs in a
       consistent way and saves some keystrokes as it handles the new lines
       and sends the messages to STDERR for you.

       This module provides the same trace methods as syslog(3)'s log levels.
       Listed from low level to high level: emerg(), alert(), crit(), error(),
       warning(), notice(), info(), debug(). The only different function is
       warning(), since warn is already taken by Perl.

       The module provides another trace function called todo() which is
       useful for todo items. It has the same level as debug (the highest).

       There are two more variants of each of these functions. If the _mark
       suffix is appended (e.g., error_mark) the trace will start with the
       filename and the line number the function was called from. If the _sub
       suffix is appended (e.g., error_info) the trace will start with the
       name of the subroutine the function was called from.

       If you have "Term::ANSIColor" installed the diagnostic messages will be
       colorized, otherwise a special for each function prefix will be used.

       If "Data::Dumper" is installed and you pass a reference to a variable
       to any of these functions, the variable will be dumped with
       "Data::Dumper::Dumper()".

       Functions whose level is above the level set in
       $Apache::TestTrace::Level become NOPs. For example if the level is set
       to alert, only alert() and emerg() functions will generate the output.
       The default setting of this variable is warning. Other valid values
       are: emerg, alert, crit, error, warning, notice, info, debug.

       Another way to affect the trace level is to set
       $ENV{APACHE_TEST_TRACE_LEVEL}, which takes effect if
       $Apache::TestTrace::Level is not set. So an explicit setting of
       $Apache::TestTrace::Level always takes precedence.

       By default all the output generated by these functions goes to STDERR.
       You can override the default filehandler by overriding
       $Apache::TestTrace::LogFH with a new filehandler.

       When you override this package's global variables, think about
       localizing your local settings, so it won't affect other modules using
       this module in the same run.

TODO
	o provide an option to disable the coloring altogether via some flag
	  or import()

AUTHOR
       Stas Bekman with contributions from Doug MacEachern

perl v5.16.2			  2011-02-07		  Apache::TestTrace(3)
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