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# -*- Perl -*- |
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# File: POE/Event/Message/UniqueID.pm |
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# Desc: Generate a guaranteed unique message identifier |
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# Date: Mon Oct 10 10:10:59 2005 |
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# Stat: Prototype, Experimental |
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# |
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package POE::Event::Message::UniqueID; |
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use 5.006; |
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use strict; |
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use warnings; |
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our $PACK = __PACKAGE__; |
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our $VERSION = '0.03'; |
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### @ISA = qw( ); |
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use POSIX; |
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use Time::HiRes; # comment this line to use CORE::time() and rand() |
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# uncomment to use gettimeofday() -- the better choice |
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my($host,$pid); |
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my($time,$ident,@prior) = ("","",()); |
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my($secs,$msecs,$rand) = (0,0,0); |
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my($errs,$mesg,$count) = (0,"",0); |
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sub import |
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{ my($class,@args) = @_; |
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$class->buildIdentityGenerator( @args ); # How will we create IDs today? |
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} |
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*generate = \&genUniqueIdent; |
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*generateUniqueID = \&genUniqueIdent; |
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sub buildIdentityGenerator |
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{ my($class,$debug) = @_; |
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$host = eval { (POSIX::uname)[1] }; |
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$pid = $$; |
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print "-" x 55 ."\n" if $debug; |
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if ( exists $INC{'Time/HiRes.pm'} ) { |
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print "Will use Time::HiRes::time() to generate IDs\n" if $debug; |
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eval('sub genUniqueIdent { |
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($secs,$msecs) = Time::HiRes::gettimeofday(); |
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( $host ."-". unpack("H*", pack("N*", $secs,$msecs,$pid)) ); |
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} |
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'); |
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} else { |
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print "Will use CORE::time() and rand() to generate IDs\n" if $debug; |
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print "(note that there is a slight chance of duplicates)\n" if $debug; |
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eval('sub genUniqueIdent { |
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my $limit = 1000000; # good distribution for uniqueness? |
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($time,$rand) = ( CORE::time(), rand($limit) ); |
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( $host ."-". unpack("H*", pack("N*", $time,$rand,$pid)) ); |
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} |
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'); |
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} |
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return; |
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} |
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my $dupErrCount; |
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sub dupErrCount { $dupErrCount }; |
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sub verifyGenerateUniqueID |
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{ my($class,$debug,$max) = @_; |
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$debug ||= 0; |
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$max ||= 1000; |
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if ($debug) { |
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print "-" x 55 ."\n"; |
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print "Generating $max IDs to verify uniqueness...\n"; |
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print " host = $host\n"; |
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print " pid = $pid\n"; |
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print " time = ". time() ."\n"; |
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} |
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foreach (1..$max) { |
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$ident = genUniqueIdent(); # This is a generated subroutine |
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1000
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if ( grep(/^$ident$/, @prior) ) { |
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($errs,$mesg) = ($errs +1, "duplicate ID!"); |
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print " ident = $ident $mesg\n"; |
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} else { |
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($mesg) = ("unique ID!"); |
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push @prior, $ident; |
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if ($count) { |
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print " ident = $ident $mesg\n" if $debug > 1; |
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} else { |
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print " ident = $ident (example)\n" if $debug > 1; |
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} |
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} |
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$count++; |
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} |
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$dupErrCount = $errs; |
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print "-" x 55 ."\n"; |
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print "IDs Generated: $count Duplicates: $errs\n"; |
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if ( $errs and exists $INC{'Time/HiRes.pm'} ) { |
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print "OUCH: the unique ID generator needs some work!!\n"; |
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} elsif ( $errs ) { |
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print "Oops: Try using 'Time::HiRes' for better results!\n"; |
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} |
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print "-" x 55 ."\n"; |
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return; |
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} |
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#_________________________ |
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1; # Required by require() |
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__END__ |