X-Git-Url: http://dxcluster.net/gitweb/gitweb.cgi?a=blobdiff_plain;f=perl%2FPrefix.pm;h=a07ebdbdde8ff5dc8fd727bd5784829b1729001c;hb=f87323c2926605792ee02b84783d8f3d4dbd605f;hp=cb62626958aed98979681ca8be6ec2ddbf9a08c6;hpb=d3296828a3cc8d4269393ee0023bb0bcded40185;p=spider.git

diff --git a/perl/Prefix.pm b/perl/Prefix.pm
index cb626269..a07ebdbd 100644
--- a/perl/Prefix.pm
+++ b/perl/Prefix.pm
@@ -14,7 +14,7 @@ use DB_File;
 use Data::Dumper;
 use DXDebug;
 use DXUtil;
-
+use LRU;
 
 use strict;
 
@@ -24,29 +24,33 @@ $BRANCH = sprintf( "%d.%03d", q$Revision$ =~ /\d+\.\d+\.(\d+)\.(\d+)/  || (0,0))
 $main::build += $VERSION;
 $main::branch += $BRANCH;
 
-use vars qw($db  %prefix_loc %pre %cache $lasttime $hits $matchtotal);
+use vars qw($db %prefix_loc %pre $lru $lrusize $misses $hits $matchtotal);
 
 $db = undef;					# the DB_File handle
 %prefix_loc = ();				# the meat of the info
 %pre = ();						# the prefix list
-%cache = ();					# a runtime cache of matched prefixes
-$lasttime = 0;					# last time this cache was cleared
-$hits = $matchtotal = 1;		# cache stats
+$hits = $misses = $matchtotal = 1;		# cache stats
+$lrusize = 1000;				# size of prefix LRU cache
+
+$lru = LRU->newbase('Prefix', $lrusize);
 
 sub load
 {
+	# untie every thing
 	if ($db) {
 		undef $db;
 		untie %pre;
 		%pre = ();
 		%prefix_loc = ();
 	}
-	$db = tie(%pre, "DB_File", undef, O_RDWR|O_CREAT, 0666, $DB_BTREE) or confess "can't tie \%pre ($!)";  
+
+	# tie the main prefix database
+	$db = tie(%pre, "DB_File", undef, O_RDWR|O_CREAT, 0664, $DB_BTREE) or confess "can't tie \%pre ($!)";  
 	my $out = $@ if $@;
 	do "$main::data/prefix_data.pl" if !$out;
 	$out = $@ if $@;
-	#  print Data::Dumper->Dump([\%pre, \%prefix_loc], [qw(pre prefix_loc)]);
-	return $out;
+
+ 	return $out;
 }
 
 sub store
@@ -141,16 +145,18 @@ sub matchprefix
 	for (my $i = length $pref; $i; $i--) {
 		$matchtotal++;
 		my $s = substr($pref, 0, $i);
-		my $p = $cache{$s};
+		push @partials, $s;
+		my $p = $lru->get($s);
 		if ($p) {
 			$hits++;
 			if (isdbg('prefix')) {
-				my $percent = sprintf "%.1f", $hits * 100 / $matchtotal;
-				dbg("Partial Prefix Cache Hit: $s Hits: $hits of $matchtotal = $percent\%");
+				my $percent = sprintf "%.1f", $hits * 100 / $misses;
+				dbg("Partial Prefix Cache Hit: $s Hits: $hits/$misses of $matchtotal = $percent\%");
 			}
+			$lru->put($_, $p) for @partials;
 			return @$p;
 		} else {
-			push @partials, $s;
+			$misses++;
 			my @out = get($s);
 			if (isdbg('prefix')) {
 				my $part = $out[0] || "*";
@@ -158,7 +164,7 @@ sub matchprefix
 				dbg("Partial prefix: $pref $s $part" );
 			} 
 			if (@out && $out[0] eq $s) {
-				$cache{$_} = \@out for @partials;
+				$lru->put($_, \@out) for @partials;
 				return @out;
 			} 
 		}
@@ -181,37 +187,28 @@ sub extract
 	my $p;
 	my @parts;
 	my ($call, $sp, $i);
-  
-	# clear out the cache periodically to stop it growing for ever.
-	if ($main::systime - $lasttime >= 15*60) {
-		if (isdbg('prefix')) {
-			my $percent = sprintf "%.1f", $hits * 100 / $matchtotal;
-			dbg("Prefix Cache Cleared, Hits: $hits of $matchtotal = $percent\%") ;
-		}
-		%cache =();
-		$lasttime = $main::systime;
-		$hits = $matchtotal = 0;
-	} 
 
 LM:	foreach $call (split /,/, $calls) {
 
 		# first check if the whole thing succeeds either because it is cached
 		# or because it simply is a stored prefix as callsign (or even a prefix)
 		$matchtotal++;
-		my $p = $cache{$call};
+		$call =~ s/-\d+$//;		# ignore SSIDs
+		my $p = $lru->get($call);
 		my @nout;
 		if ($p) {
 			$hits++;
 			if (isdbg('prefix')) {
-				my $percent = sprintf "%.1f", $hits * 100 / $matchtotal;
-				dbg("Prefix Cache Hit: $call Hits: $hits of $matchtotal = $percent\%");
+				my $percent = sprintf "%.1f", $hits * 100 / $misses;
+				dbg("Prefix Cache Hit: $call Hits: $hits/$misses of $matchtotal = $percent\%");
 			}
 			push @out, @$p;
 			next;
 		} else {
 			@nout =  get($call);
 			if (@nout && $nout[0] eq $call) {
-				$cache{$call} = \@nout;
+				$misses++;
+				$lru->put($call, \@nout);
 				dbg("got exact prefix: $nout[0]") if isdbg('prefix');
 				push @out, @nout;
 				next;
@@ -231,7 +228,8 @@ LM:	foreach $call (split /,/, $calls) {
 			@nout = get($s);
 			if (@nout && $nout[0] eq $s) {
 				dbg("got exact multipart prefix: $call $s") if isdbg('prefix');
-				$cache{$call} = \@nout;
+				$misses++;
+				$lru->put($call, \@nout);
 				push @out, @nout;
 				next;
 			}
@@ -250,7 +248,8 @@ LM:	foreach $call (split /,/, $calls) {
 				my @try = get($s);
 				if (@try && $try[0] eq $s) {
 					dbg("got 3 part prefix: $call $s") if isdbg('prefix');
-					$cache{$call} = \@try;
+					$misses++;
+					$lru->put($call, \@try);
 					push @out, @try;
 					next;
 				}
@@ -272,7 +271,8 @@ LM:	foreach $call (split /,/, $calls) {
 				my @try = get($s);
 				if (@try && $try[0] eq $s) {
 					dbg("got 2 part prefix: $call $s") if isdbg('prefix');
-					$cache{$call} = \@try;
+					$misses++;
+					$lru->put($call, \@try);
 					push @out, @try;
 					next;
 				}
@@ -287,7 +287,8 @@ LM:	foreach $call (split /,/, $calls) {
 			@nout = matchprefix($parts[0]);
 			if (@nout) {
 				dbg("got prefix: $call = $nout[0]") if isdbg('prefix');
-				$cache{$call} = \@nout;
+				$misses++;
+				$lru->put($call, \@nout);
 				push @out, @nout;
 				next;
 			}
@@ -331,14 +332,17 @@ L1:		for ($n = 0; $n < @parts; $n++) {
 						dbg("Compound prefix: $try $part" );
 					}
 					if (@try && $try eq $try[0]) {
-						$cache{$call} = \@try;
+						$misses++;
+						$lru->put($call, \@try);
 						push @out, @try;
 					} else {
-						$cache{$call} = \@nout;
+						$misses++;
+						$lru->put($call, \@nout);
 						push @out, @nout;
 					}
 				} else {
-					$cache{$call} = \@nout;
+					$misses++;
+					$lru->put($call, \@nout);
 					push @out, @nout;
 				}
 				next LM;
@@ -347,7 +351,8 @@ L1:		for ($n = 0; $n < @parts; $n++) {
 
 		# we are a pirate!
 		@nout = matchprefix('Q');
-		$cache{$call} = \@nout;
+		$misses++;
+		$lru->put($call, \@nout);
 		push @out, @nout;
 	}