From: Ton Voon <ton.voon@opsera.com>
Date: Fri, 14 May 2010 21:25:02 +0000 (+0000)
Subject: Conversion of eval => try (part 1)
X-Git-Tag: v0.08122~57^2~19
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=dbsrgits%2FDBIx-Class.git;a=commitdiff_plain;h=20674fcd94984d0d2be09ecda7f3c22715468936

Conversion of eval => try (part 1)
---

diff --git a/Makefile.PL b/Makefile.PL
index 3203baf..133007f 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -50,6 +50,7 @@ my $runtime_requires = {
   'Data::Dumper::Concise'    => '1.000',
   'Scope::Guard'             => '0.03',
   'Context::Preserve'        => '0.01',
+  'Try::Tiny'                => '0.04',
 };
 
 # this is so we can order requires alphabetically
diff --git a/lib/DBIx/Class.pm b/lib/DBIx/Class.pm
index 1a50606..7aba895 100644
--- a/lib/DBIx/Class.pm
+++ b/lib/DBIx/Class.pm
@@ -11,6 +11,7 @@ use DBIx::Class::Optional::Dependencies;
 use vars qw($VERSION);
 use base qw/DBIx::Class::Componentised Class::Accessor::Grouped/;
 use DBIx::Class::StartupCheck;
+use Try::Tiny;
 
 sub mk_classdata {
   shift->mk_classaccessor(@_);
@@ -42,8 +43,14 @@ sub MODIFY_CODE_ATTRIBUTES {
 sub _attr_cache {
   my $self = shift;
   my $cache = $self->can('__attr_cache') ? $self->__attr_cache : {};
-  my $rest = eval { $self->next::method };
-  return $@ ? $cache : { %$cache, %$rest };
+  my $rest;
+  my $exception;
+  try {
+    $rest = $self->next::method;
+  } catch {
+    $exception = 1;
+  };
+  return $exception ? $cache : { %$cache, %$rest };
 }
 
 1;
diff --git a/lib/DBIx/Class/Schema/Versioned.pm b/lib/DBIx/Class/Schema/Versioned.pm
index aa4f702..fe6c694 100644
--- a/lib/DBIx/Class/Schema/Versioned.pm
+++ b/lib/DBIx/Class/Schema/Versioned.pm
@@ -503,8 +503,9 @@ sub get_db_version
     my ($self, $rs) = @_;
 
     my $vtable = $self->{vschema}->resultset('Table');
-    my $version = eval {
-      $vtable->search({}, { order_by => { -desc => 'installed' }, rows => 1 } )
+    my $version;
+    try {
+      $version = $vtable->search({}, { order_by => { -desc => 'installed' }, rows => 1 } )
               ->get_column ('version')
                ->next;
     };
@@ -723,10 +724,14 @@ sub _source_exists
 {
     my ($self, $rs) = @_;
 
-    my $c = eval {
-        $rs->search({ 1, 0 })->count;
+    my $c;
+    my $exception;
+    try {
+        $c = $rs->search({ 1, 0 })->count;
+    } catch {
+        $exception=1;
     };
-    return 0 if $@ || !defined $c;
+    return 0 if $exception || !defined $c;
 
     return 1;
 }
diff --git a/lib/DBIx/Class/Storage.pm b/lib/DBIx/Class/Storage.pm
index 0def315..08ea155 100644
--- a/lib/DBIx/Class/Storage.pm
+++ b/lib/DBIx/Class/Storage.pm
@@ -158,16 +158,15 @@ For example,
   };
 
   my $rs;
-  eval {
+  try {
     $rs = $schema->txn_do($coderef);
-  };
-
-  if ($@) {                                  # Transaction failed
+  } catch {
+    # Transaction failed
     die "something terrible has happened!"   #
       if ($@ =~ /Rollback failed/);          # Rollback failed
 
     deal_with_failed_transaction();
-  }
+  };
 
 In a nested transaction (calling txn_do() from within a txn_do() coderef) only
 the outermost transaction will issue a L</txn_commit>, and txn_do() can be
@@ -197,7 +196,7 @@ sub txn_do {
   my $wantarray = wantarray; # Need to save this since the context
                              # inside the eval{} block is independent
                              # of the context that called txn_do()
-  eval {
+  try {
 
     # Need to differentiate between scalar/list context to allow for
     # returning a list in scalar context to get the size of the list
@@ -212,16 +211,12 @@ sub txn_do {
       $coderef->(@args);
     }
     $self->txn_commit;
-  };
-
-  if ($@) {
+  } catch {
     my $error = $@;
 
-    eval {
+    try {
       $self->txn_rollback;
-    };
-
-    if ($@) {
+    } catch {
       my $rollback_error = $@;
       my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION";
       $self->throw_exception($error)  # propagate nested rollback
@@ -230,9 +225,8 @@ sub txn_do {
       $self->throw_exception(
         "Transaction aborted: $error. Rollback failed: ${rollback_error}"
       );
-    } else {
-      $self->throw_exception($error); # txn failed but rollback succeeded
     }
+    $self->throw_exception($error); # txn failed but rollback succeeded
   }
 
   return $wantarray ? @return_values : $return_value;
diff --git a/lib/DBIx/Class/Storage/DBI.pm b/lib/DBIx/Class/Storage/DBI.pm
index 4214463..98c9f91 100644
--- a/lib/DBIx/Class/Storage/DBI.pm
+++ b/lib/DBIx/Class/Storage/DBI.pm
@@ -15,6 +15,7 @@ use Scalar::Util();
 use List::Util();
 use Data::Dumper::Concise();
 use Sub::Name ();
+use Try::Tiny;
 
 use File::Path ();
 
@@ -157,8 +158,7 @@ sub DESTROY {
 
   # some databases need this to stop spewing warnings
   if (my $dbh = $self->_dbh) {
-    local $@;
-    eval {
+    try {
       %{ $dbh->{CachedKids} } = ();
       $dbh->disconnect;
     };