From 13d23a6f19e2f8192d894171aaecc7987044a72a Mon Sep 17 00:00:00 2001
From: Ralf Ertzinger <ralf@skytale.net>
Date: Sun, 23 Jun 2013 19:07:57 +0200
Subject: [PATCH] libvideosite: Add config caching

---
 libvideosite.pm | 51 +++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 45 insertions(+), 6 deletions(-)

diff --git a/libvideosite.pm b/libvideosite.pm
index 7c77a3b..3554201 100644
--- a/libvideosite.pm
+++ b/libvideosite.pm
@@ -34,6 +34,8 @@ my $getter;
 my %builtin_config = ();
 my $builtin_config_path;
 my $builtin_config_default;
+my $config_cache = 0;
+my %config_cache = ();
 our $error;
 
 #
@@ -124,6 +126,10 @@ my $videosite_commands = {
     'nodebug' => sub {
         _cmd_nodebug(@_);
     },
+
+    'cache' => sub {
+        _cmd_cache(@_);
+    },
 };
 
 #
@@ -301,36 +307,53 @@ sub _load_modules($) {
 #
 sub _config_get {
     my $path = shift;
+    my $dotpath = join('.', @{$path});
     my $value;
 
-    $value = $remote_api->{config_get}->($path);
-    _debug("config: getting %s=%s", join('.', @{$path}), $value);
+    if ($config_cache && exists($config_cache{$dotpath}) && exists($config_cache{$dotpath}->{value})) {
+        $value = $config_cache{$dotpath}->{value};
+    } else {
+        $value = $remote_api->{config_get}->($path);
+        $config_cache{$dotpath} = {value => $value, has => 1};
+
+    }
 
+    _debug("config: getting %s=%s", $dotpath, $value);
     return $value;
 }
 
 sub _config_set {
     my $path = shift;
+    my $dotpath = join('.', @{$path});
     my $value = shift;
 
-    _debug("config: setting %s=%s", join('.', @{$path}), $value);
+    _debug("config: setting %s=%s", $dotpath, $value);
+    $config_cache{$dotpath} = {value => $value, has => 1};
     return $remote_api->{config_set}->($path, $value);
 }
 
 sub _config_has {
     my $path = shift;
+    my $dotpath = join('.', @{$path});
     my $b;
 
-    $b = $remote_api->{config_has}->($path);
-    _debug("config: testing %s (%s)", join('.', @{$path}), $b?'true':'false');
+    if ($config_cache && exists($config_cache{$dotpath}) && exists($config_cache{$dotpath}->{has})) {
+        $b = $config_cache{$dotpath}->{has};
+    } else {
+        $b = $remote_api->{config_has}->($path);
+        $config_cache{$dotpath}->{has} = $b;
+    }
 
+    _debug("config: testing %s (%s)", $dotpath, $b?'true':'false');
     return $b;
 }
 
 sub _config_del {
     my $path = shift;
+    my $dotpath = join('.', @{$path});
 
-    _debug("config: removing %s", join('.', @{$path}));
+    _debug("config: removing %s", $dotpath);
+    delete($config_cache{$dotpath});
     $remote_api->{config_del}->($path);
 }
 
@@ -907,6 +930,18 @@ sub _cmd_nodebug {
     }
 }
 
+#
+# Display the content of the config cache
+#
+sub _cmd_cache {
+    my $event = shift;
+
+    _io("Content of config cache:");
+    foreach (sort(keys(%config_cache))) {
+        _io("%s => %s", $_, Dumper($config_cache{$_}));
+    }
+}
+
 
 #
 # Return the list of loaded grabbers.
@@ -1086,6 +1121,10 @@ sub register_api {
         $builtin_config_default = $a->{_config_default}->();
     }
 
+    if (exists($a->{_config_cache})) {
+        $config_cache = $a->{_config_cache}->();
+    }
+
     @outputstack = ({io => $remote_api->{'io'}, window => ""});
 
     return 1;
-- 
1.8.3.1