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=head1 NAME |
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AnyEvent::MP::Global - some network-global services |
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=head1 SYNOPSIS |
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use AnyEvent::MP::Global; |
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|
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=head1 DESCRIPTION |
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This module maintains a fully-meshed network between global nodes and |
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tries to have connections with all nodes in the network. |
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It also manages named port groups - ports can register themselves in any |
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number of groups that will be available network-wide, which is great for |
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discovering services. |
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|
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Running it on one node will automatically run it on all nodes, although, |
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at the moment, the global service is started by default anyways. |
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|
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=head1 GLOBALS AND FUNCTIONS |
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=over 4 |
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=cut |
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package AnyEvent::MP::Global; |
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use common::sense; |
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use Carp (); |
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|
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use AnyEvent (); |
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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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use AnyEvent::MP::Transport (); |
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use base "Exporter"; |
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our @EXPORT = qw( |
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grp_reg |
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grp_get |
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grp_mon |
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); |
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|
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$AnyEvent::MP::Kernel::WARN->(7, "starting global service."); |
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|
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############################################################################# |
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# node protocol parts for global nodes |
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{ |
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package AnyEvent::MP::Kernel; |
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# TODO: this is ugly, maybe this should go into MP::Kernel or a separate module #d# |
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|
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our $GLOBAL; |
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our $NODE_ADDR; |
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our $GLOBAL_ADDR; |
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our $NODE; |
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our %GLOBAL_SLAVE; |
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our $GLOBAL_MON; |
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our $LISTENER; |
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|
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# switch to global mode |
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$GLOBAL = 1; |
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$MASTER = $NODE; |
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undef $GLOBAL_MON; |
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|
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$GLOBAL_ADDR->{$NODE} = $LISTENER; |
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|
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$GLOBAL_MON = mon_nodes sub { |
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return if $_[1]; |
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|
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delete $NODE_ADDR->{$_[0]}; |
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|
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if (delete $GLOBAL_ADDR->{$_[0]}) { |
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# if the node is global, tell our slaves |
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our %GLOBAL_SLAVE; # ugh, will be in AnyEvent::MP::Global |
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snd $_, g_del => $_[0] |
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for keys %GLOBAL_SLAVE; |
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} |
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}; |
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|
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# tell everybody who connects that we are a global node |
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push @AnyEvent::MP::Transport::HOOK_GREET, sub { |
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$_[0]{local_greeting}{global} = 1; |
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}; |
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# tell every global node that connects that we are global too |
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push @AnyEvent::MP::Transport::HOOK_CONNECT, sub { |
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snd $_[0], g_add => $NODE, $LISTENER |
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if $_[0]{remote_greeting}{global}; |
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}; |
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# tell everybody else that we are global now |
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snd $_ => g_add => $NODE, $LISTENER |
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for up_nodes; |
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} |
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=item $guard = grp_reg $group, $port |
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Register the given (local!) port in the named global group C<$group>. |
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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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=cut |
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# register local port |
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sub grp_reg($$) { |
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my ($group, $port) = @_; |
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port_is_local $port |
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or Carp::croak "AnyEvent::MP::Global::grp_reg can only be called for local ports, caught"; |
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|
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defined wantarray && AnyEvent::Util::guard { unregister ($port, $group) } |
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} |
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=item $ports = grp_get $group |
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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 grp_get($) { |
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} |
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=item $guard = grp_mon $group, $callback->($ports, $add, $del) |
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Installs a monitor on the given group. Each time there is a change it |
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will be called with the current group members as an arrayref as the |
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first argument. The second argument only contains ports added, the third |
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argument only ports removed. |
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Unlike C<grp_get>, all three arguments will always be array-refs, even if |
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the array is empty. None of the arrays must be modified in any way. |
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The first invocation will be with the first two arguments set to the |
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current members, as if all of them were just added, but only when the |
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group is actually non-empty. |
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Optionally returns a guard object that uninstalls the watcher when it is |
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destroyed. |
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|
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=cut |
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|
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sub grp_mon($$) { |
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my ($grp, $cb) = @_; |
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} |
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=back |
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=head1 SEE ALSO |
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|
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L<AnyEvent::MP>. |
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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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