From 1c5e0c47c92128afebef5614407d84cd72c12b35 Mon Sep 17 00:00:00 2001
From: Byron Jones <bjones@mozilla.com>
Date: Wed, 28 Nov 2012 16:40:21 +0800
Subject: Bug 814411: Add a caching mechanism to Bugzilla::Object to avoid
 querying the database repeatedly for the same information

---
 Bugzilla/Object.pm | 44 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

(limited to 'Bugzilla/Object.pm')

diff --git a/Bugzilla/Object.pm b/Bugzilla/Object.pm
index 8089c6ccc..96651d191 100644
--- a/Bugzilla/Object.pm
+++ b/Bugzilla/Object.pm
@@ -72,6 +72,8 @@ sub new {
 sub _init {
     my $class = shift;
     my ($param) = @_;
+    my $object = $class->_cache_get($param);
+    return $object if $object;
     my $dbh = Bugzilla->dbh;
     my $columns = join(',', $class->_get_db_columns);
     my $table   = $class->DB_TABLE;
@@ -82,7 +84,6 @@ sub _init {
     if (ref $param eq 'HASH') {
         $id = $param->{id};
     }
-    my $object;
 
     if (defined $id) {
         # We special-case if somebody specifies an ID, so that we can
@@ -125,9 +126,48 @@ sub _init {
             "SELECT $columns FROM $table WHERE $condition", undef, @values);
     }
 
+    $class->_cache_set($param, $object) if $object;
     return $object;
 }
 
+# Provides a mechanism for objects to be cached in the request_cahce
+
+sub _cache_get {
+    my $class = shift;
+    my ($param) = @_;
+    my $cache_key = $class->cache_key($param)
+      || return;
+    return Bugzilla->request_cache->{$cache_key};
+}
+
+sub _cache_set {
+    my $class = shift;
+    my ($param, $object) = @_;
+    my $cache_key = $class->cache_key($param)
+      || return;
+    Bugzilla->request_cache->{$cache_key} = $object;
+}
+
+sub _cache_remove {
+    my $class = shift;
+    my ($param, $object) = @_;
+    $param->{cache} = 1;
+    my $cache_key = $class->cache_key($param)
+      || return;
+    delete Bugzilla->request_cache->{$cache_key};
+}
+
+sub cache_key {
+    my $class = shift;
+    my ($param) = @_;
+    if (ref($param) && $param->{cache} && ($param->{id} || $param->{name})) {
+        $class = blessed($class) if blessed($class);
+        return $class  . ',' . ($param->{id} || $param->{name});
+    } else {
+        return;
+    }
+}
+
 sub check {
     my ($invocant, $param) = @_;
     my $class = ref($invocant) || $invocant;
@@ -406,6 +446,7 @@ sub update {
     $self->audit_log(\%changes) if $self->AUDIT_UPDATES;
 
     $dbh->bz_commit_transaction();
+    $self->_cache_remove({ id => $self->id });
 
     if (wantarray) {
         return (\%changes, $old_self);
@@ -424,6 +465,7 @@ sub remove_from_db {
     $self->audit_log(AUDIT_REMOVE) if $self->AUDIT_REMOVES;
     $dbh->do("DELETE FROM $table WHERE $id_field = ?", undef, $self->id);
     $dbh->bz_commit_transaction();
+    $self->_cache_remove({ id => $self->id });
     undef $self;
 }
 
-- 
cgit v1.2.3-24-g4f1b