simplify then:: code for recent Futures

[scpubgit/Object-Remote.git] / lib / Object / Remote / Future.pm

diff --git a/lib/Object/Remote/Future.pm b/lib/Object/Remote/Future.pm
index 3a2643b..83aad96 100644 (file)
--- a/lib/Object/Remote/Future.pm
+++ b/lib/Object/Remote/Future.pm
@@ -4,51 +4,115 @@ use strict;
 use warnings;
 use base qw(Exporter);
 
-use CPS::Future;
+use Object::Remote::Logging qw( :log router );
+
+BEGIN { router()->exclude_forwarding }
+
+use Future;
 
 our @EXPORT = qw(future await_future await_all);
 
-sub future (&) {
-  my $f = $_[0]->(CPS::Future->new);
-  return $f if ((caller(1)||'') eq 'start');
+sub future (&;$) {
+  my $f = $_[0]->(Future->new);
+  return $f if ((caller(1+($_[1]||0))||'') eq 'start');
   await_future($f);
 }
 
+our @await;
+
 sub await_future {
   my $f = shift;
+  log_trace { my $ir = $f->is_ready; "await_future() invoked; is_ready: $ir" };
   return $f if $f->is_ready;
   require Object::Remote;
   my $loop = Object::Remote->current_loop;
-  $f->on_ready(sub { $loop->stop });
-  $loop->run;
+  {
+    local @await = (@await, $f);
+    $f->on_ready(sub {
+      log_trace { my $l = @await; "future has become ready, length of \@await: '$l'" };
+      if ($f == $await[-1]) {
+        log_trace { "This future is not waiting on anything so calling stop on the run loop" };
+        $loop->stop;
+      }
+    });
+    log_trace { "Starting run loop for newly created future" };
+    $loop->run;
+  }
+  if (@await and $await[-1]->is_ready) {
+    log_trace { "Last future in await list was ready, stopping run loop" };
+    $loop->stop;
+  }
+  log_trace { "await_future() returning" };
   return wantarray ? $f->get : ($f->get)[0];
 }
 
 sub await_all {
-  await_future(CPS::Future->needs_all(@_));
+  log_trace { my $l = @_; "await_all() invoked with '$l' futures to wait on" };
+  await_future(Future->wait_all(@_));
   map $_->get, @_;
 }
 
 package start;
 
+our $start = sub { my ($obj, $call) = (shift, shift); $obj->$call(@_); };
+
 sub AUTOLOAD {
   my $invocant = shift;
   my ($method) = our $AUTOLOAD =~ /^start::(.+)$/;
-  if (ref($invocant) eq 'ARRAY') {
-    return [ map $_->${\"start::${method}"}, @$invocant ];
-  }
   my $res;
   unless (eval { $res = $invocant->$method(@_); 1 }) {
-    my $f = CPS::Future->new;
+    my $f = Future->new;
     $f->fail($@);
     return $f;
   }
-  unless (Scalar::Util::blessed($res) and $res->isa('CPS::Future')) {
-    my $f = CPS::Future->new;
+  unless (Scalar::Util::blessed($res) and $res->isa('Future')) {
+    my $f = Future->new;
     $f->done($res);
     return $f;
   }
   return $res;
 }
 
+package maybe;
+
+sub start {
+  my ($obj, $call) = (shift, shift);
+  if ((caller(1)||'') eq 'start') {
+    $obj->$start::start($call => @_);
+  } else {
+    $obj->$call(@_);
+  }
+}
+
+package maybe::start;
+
+sub AUTOLOAD {
+  my $invocant = shift;
+  my ($method) = our $AUTOLOAD =~ /^maybe::start::(.+)$/;
+  $method = "start::${method}" if ((caller(1)||'') eq 'start');
+  $invocant->$method(@_);
+}
+
+package then;
+
+sub AUTOLOAD {
+  my $invocant = shift;
+  my ($method) = our $AUTOLOAD =~ /^then::(.+)$/;
+  my @args = @_;
+  return $invocant->and_then(sub {
+    my ($obj) = $_[0]->get;
+    return $obj->${\"start::${method}"}(@args);
+  });
+}
+
 1;
+
+=head1 NAME
+
+Object::Remote::Future - Asynchronous calling for L<Object::Remote>
+
+=head1 LAME
+
+Shipping prioritised over writing this part up. Blame mst.
+
+=cut