| … | |
… | |
| 109 | to have fixed listening addresses, seed nodes are perfectly normal nodes - |
109 | to have fixed listening addresses, seed nodes are perfectly normal nodes - |
| 110 | any node can function as a seed node for others. |
110 | any node can function as a seed node for others. |
| 111 | |
111 | |
| 112 | In addition to discovering the network, seed nodes are also used to |
112 | In addition to discovering the network, seed nodes are also used to |
| 113 | maintain the network and to connect nodes that otherwise would have |
113 | maintain the network and to connect nodes that otherwise would have |
| 114 | trouble connecting. They form the backbone of the AnyEvent::MP network. |
114 | trouble connecting. They form the backbone of an AnyEvent::MP network. |
| 115 | |
115 | |
| 116 | Seed nodes are expected to be long-running, and at least one seed node |
116 | Seed nodes are expected to be long-running, and at least one seed node |
| 117 | should always be available. |
117 | should always be available. They should also be relatively responsive - a |
|
|
118 | seed node that blocks for long periods will slow down everybody else. |
| 118 | |
119 | |
| 119 | =item seeds - C<host:port> |
120 | =item seeds - C<host:port> |
| 120 | |
121 | |
| 121 | Seeds are transport endpoint(s) (usually a hostname/IP address and a |
122 | Seeds are transport endpoint(s) (usually a hostname/IP address and a |
| 122 | TCP port) of nodes thta should be used as seed nodes. |
123 | TCP port) of nodes thta should be used as seed nodes. |
| … | |
… | |
| 149 | our $VERSION = $AnyEvent::MP::Kernel::VERSION; |
150 | our $VERSION = $AnyEvent::MP::Kernel::VERSION; |
| 150 | |
151 | |
| 151 | our @EXPORT = qw( |
152 | our @EXPORT = qw( |
| 152 | NODE $NODE *SELF node_of after |
153 | NODE $NODE *SELF node_of after |
| 153 | configure |
154 | configure |
| 154 | snd rcv mon mon_guard kil reg psub spawn |
155 | snd rcv mon mon_guard kil reg psub spawn cal |
| 155 | port |
156 | port |
| 156 | ); |
157 | ); |
| 157 | |
158 | |
| 158 | our $SELF; |
159 | our $SELF; |
| 159 | |
160 | |
| … | |
… | |
| 228 | L<AnyEvent::MP::Global> module, which will then use it to keep |
229 | L<AnyEvent::MP::Global> module, which will then use it to keep |
| 229 | connectivity with at least one node at any point in time. |
230 | connectivity with at least one node at any point in time. |
| 230 | |
231 | |
| 231 | =back |
232 | =back |
| 232 | |
233 | |
| 233 | Example: become a distributed node using the locla node name as profile. |
234 | Example: become a distributed node using the local node name as profile. |
| 234 | This should be the most common form of invocation for "daemon"-type nodes. |
235 | This should be the most common form of invocation for "daemon"-type nodes. |
| 235 | |
236 | |
| 236 | configure |
237 | configure |
| 237 | |
238 | |
| 238 | Example: become an anonymous node. This form is often used for commandline |
239 | Example: become an anonymous node. This form is often used for commandline |
| … | |
… | |
| 714 | ? $action[0]() |
715 | ? $action[0]() |
| 715 | : snd @action; |
716 | : snd @action; |
| 716 | }; |
717 | }; |
| 717 | } |
718 | } |
| 718 | |
719 | |
|
|
720 | =item cal $port, @msg, $callback[, $timeout] |
|
|
721 | |
|
|
722 | A simple form of RPC - sends a message to the given C<$port> with the |
|
|
723 | given contents (C<@msg>), but adds a reply port to the message. |
|
|
724 | |
|
|
725 | The reply port is created temporarily just for the purpose of receiving |
|
|
726 | the reply, and will be C<kil>ed when no longer needed. |
|
|
727 | |
|
|
728 | A reply message sent to the port is passed to the C<$callback> as-is. |
|
|
729 | |
|
|
730 | If an optional time-out (in seconds) is given and it is not C<undef>, |
|
|
731 | then the callback will be called without any arguments after the time-out |
|
|
732 | elapsed and the port is C<kil>ed. |
|
|
733 | |
|
|
734 | If no time-out is given, then the local port will monitor the remote port |
|
|
735 | instead, so it eventually gets cleaned-up. |
|
|
736 | |
|
|
737 | Currently this function returns the temporary port, but this "feature" |
|
|
738 | might go in future versions unless you can make a convincing case that |
|
|
739 | this is indeed useful for something. |
|
|
740 | |
|
|
741 | =cut |
|
|
742 | |
|
|
743 | sub cal(@) { |
|
|
744 | my $timeout = ref $_[-1] ? undef : pop; |
|
|
745 | my $cb = pop; |
|
|
746 | |
|
|
747 | my $port = port { |
|
|
748 | undef $timeout; |
|
|
749 | kil $SELF; |
|
|
750 | &$cb; |
|
|
751 | }; |
|
|
752 | |
|
|
753 | if (defined $timeout) { |
|
|
754 | $timeout = AE::timer $timeout, 0, sub { |
|
|
755 | undef $timeout; |
|
|
756 | kil $port; |
|
|
757 | $cb->(); |
|
|
758 | }; |
|
|
759 | } else { |
|
|
760 | mon $_[0], sub { |
|
|
761 | kil $port; |
|
|
762 | $cb->(); |
|
|
763 | }; |
|
|
764 | } |
|
|
765 | |
|
|
766 | push @_, $port; |
|
|
767 | &snd; |
|
|
768 | |
|
|
769 | $port |
|
|
770 | } |
|
|
771 | |
| 719 | =back |
772 | =back |
| 720 | |
773 | |
| 721 | =head1 AnyEvent::MP vs. Distributed Erlang |
774 | =head1 AnyEvent::MP vs. Distributed Erlang |
| 722 | |
775 | |
| 723 | AnyEvent::MP got lots of its ideas from distributed Erlang (Erlang node |
776 | AnyEvent::MP got lots of its ideas from distributed Erlang (Erlang node |
