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=head1 NAME |
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AnyEvent::MP::Global - some network-global services |
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|
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=head1 SYNOPSIS |
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|
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use AnyEvent::MP::Global; |
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# -OR- |
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aemp addservice AnyEvent::MP::Global:: |
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|
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=head1 DESCRIPTION |
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|
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This module provides an assortment of network-global functions: group name |
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registration and non-local locks. |
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|
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It will also try to build and maintain a full mesh of all network nodes. |
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|
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While it isn't mandatory to run the global services, running it on one |
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node will automatically run it on all nodes. |
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|
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=head1 GLOBALS AND FUNCTIONS |
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|
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=over 4 |
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|
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=cut |
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|
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package AnyEvent::MP::Global; |
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|
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use common::sense; |
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use Carp (); |
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use MIME::Base64 (); |
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|
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use AnyEvent::Util (); |
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|
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use AnyEvent::MP; |
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use AnyEvent::MP::Kernel; |
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|
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our $VERSION = $AnyEvent::MP::VERSION; |
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|
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our %port; # our rendezvous port on the other side |
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our %lreg; # local registry, name => [pid...] |
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our %lmon; # local rgeistry monitoring name,pid => mon |
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our %greg; # global regstry, name => [pid...] |
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|
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$AnyEvent::MP::Kernel::WARN->(7, "starting global service."); |
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|
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sub unreg_groups($) { |
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my ($noderef) = @_; |
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|
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my $qr = qr/^\Q$noderef\E(?:#|$)/; |
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|
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for my $group (values %greg) { |
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@$group = grep $_ !~ $qr, @$group; |
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} |
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} |
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|
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sub set_groups($$) { |
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my ($noderef, $lreg) = @_; |
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|
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while (my ($k, $v) = each %$lreg) { |
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push @{ $greg{$k} }, @$v; |
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} |
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} |
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|
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=item $ports = find $group |
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|
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Returns all the ports currently registered to the given group (as |
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read-only array reference). When the group has no registered members, |
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return C<undef>. |
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|
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=cut |
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|
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sub find($) { |
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@{ $greg{$_[0]} } |
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? $greg{$_[0]} |
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: undef |
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} |
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|
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=item $guard = register $port, $group |
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|
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Register the given (local!) port in the named global group C<$group>. |
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|
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The port will be unregistered automatically when the port is destroyed. |
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When not called in void context, then a guard object will be returned that |
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will also cause the name to be unregistered when destroyed. |
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|
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=cut |
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|
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# register port from any node |
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sub _register { |
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my ($port, $group) = @_; |
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|
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push @{ $greg{$group} }, $port; |
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} |
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|
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# unregister port from any node |
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sub _unregister { |
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my ($port, $group) = @_; |
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|
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@{ $greg{$group} } = grep $_ ne $port, @{ $greg{$group} }; |
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} |
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|
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# unregister local port |
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sub unregister { |
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my ($port, $group) = @_; |
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|
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delete $lmon{"$group\x00$port"}; |
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@{ $lreg{$group} } = grep $_ ne $port, @{ $lreg{$group} }; |
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|
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_unregister $port, $group; |
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|
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snd $_, reg0 => $port, $group |
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for values %port; |
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} |
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|
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# register local port |
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sub register($$) { |
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my ($port, $group) = @_; |
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|
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port_is_local $port |
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or Carp::croak "AnyEvent::MP::Global::register can only be called for local ports, caught"; |
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|
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$lmon{"$group\x00$port"} = mon $port, sub { unregister $port, $group }; |
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push @{ $lreg{$group} }, $port; |
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|
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snd $_, reg1 => $port, $group |
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for values %port; |
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|
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_register $port, $group; |
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|
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wantarray && AnyEvent::Util::guard { unregister $port, $group } |
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} |
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|
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sub start_node { |
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my ($noderef) = @_; |
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return if exists $port{$noderef}; |
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return if $noderef eq $NODE; # do not connect to ourselves |
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|
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# establish connection |
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my $port = $port{$noderef} = spawn $noderef, "AnyEvent::MP::Global::connect", 0, $NODE; |
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# request any other nodes possibly known to us |
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mon $port, sub { |
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unreg_groups $noderef; |
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delete $port{$noderef}; |
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}; |
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snd $port, connect_nodes => up_nodes; |
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snd $port, set => \%lreg; |
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} |
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|
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# other nodes connect via this |
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sub connect { |
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my ($version, $noderef) = @_; |
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|
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# monitor them, silently die |
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mon $noderef, psub { kil $SELF }; |
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|
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rcv $SELF, |
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connect_nodes => sub { |
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for (@_) { |
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connect_node $_; |
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start_node $_; |
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} |
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}, |
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set => sub { |
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set_groups $noderef, shift; |
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}, |
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reg1 => \&_register, |
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reg0 => \&_unregister, |
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; |
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} |
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|
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sub mon_node { |
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my ($noderef, $is_up) = @_; |
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|
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if ($is_up) { |
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start_node $noderef; |
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} else { |
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unreg_groups $noderef; |
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} |
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#warn "node<$noderef,$is_up>\n";#d# |
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} |
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mon_node $_, 1 |
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for up_nodes; |
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|
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mon_nodes \&mon_node; |
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|
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=back |
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|
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=head1 SEE ALSO |
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|
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L<AnyEvent::MP>. |
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|
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=head1 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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|
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=cut |
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1 |
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