| … | |
… | |
| 85 | |
85 | |
| 86 | A node is a single process containing at least one port - the node port, |
86 | A node is a single process containing at least one port - the node port, |
| 87 | which provides nodes to manage each other remotely, and to create new |
87 | which provides nodes to manage each other remotely, and to create new |
| 88 | ports. |
88 | ports. |
| 89 | |
89 | |
| 90 | Nodes are either private (single-process only), slaves (connected to a |
90 | Nodes are either private (single-process only), slaves (can only talk to |
| 91 | master node only) or public nodes (connectable from unrelated nodes). |
91 | public nodes, but do not need an open port) or public nodes (connectable |
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92 | from any other node). |
| 92 | |
93 | |
| 93 | =item noderef - C<host:port,host:port...>, C<id@noderef>, C<id> |
94 | =item noderef - C<host:port,host:port...>, C<id@noderef>, C<id> |
| 94 | |
95 | |
| 95 | A node reference is a string that either simply identifies the node (for |
96 | A node reference is a string that either simply identifies the node (for |
| 96 | private and slave nodes), or contains a recipe on how to reach a given |
97 | private and slave nodes), or contains a recipe on how to reach a given |
| … | |
… | |
| 126 | use base "Exporter"; |
127 | use base "Exporter"; |
| 127 | |
128 | |
| 128 | our $VERSION = $AnyEvent::MP::Kernel::VERSION; |
129 | our $VERSION = $AnyEvent::MP::Kernel::VERSION; |
| 129 | |
130 | |
| 130 | our @EXPORT = qw( |
131 | our @EXPORT = qw( |
| 131 | NODE $NODE *SELF node_of _any_ |
132 | NODE $NODE *SELF node_of after |
| 132 | resolve_node initialise_node |
133 | resolve_node initialise_node |
| 133 | snd rcv mon kil reg psub spawn |
134 | snd rcv mon mon_guard kil reg psub spawn |
| 134 | port |
135 | port |
| 135 | ); |
136 | ); |
| 136 | |
137 | |
| 137 | our $SELF; |
138 | our $SELF; |
| 138 | |
139 | |
| … | |
… | |
| 180 | |
181 | |
| 181 | For public nodes, C<$noderef> (supplied either directly to |
182 | For public nodes, C<$noderef> (supplied either directly to |
| 182 | C<initialise_node> or indirectly via a profile or the nodename) must be a |
183 | C<initialise_node> or indirectly via a profile or the nodename) must be a |
| 183 | noderef (possibly unresolved, in which case it will be resolved). |
184 | noderef (possibly unresolved, in which case it will be resolved). |
| 184 | |
185 | |
| 185 | After resolving, the node will bind itself on all endpoints and try to |
186 | After resolving, the node will bind itself on all endpoints. |
| 186 | connect to all additional C<$seednodes> that are specified. Seednodes are |
187 | |
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188 | =item slave nodes |
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189 | |
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190 | When the C<$noderef> (either as given or overriden by the config file) |
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191 | is the special string C<slave/>, then the node will become a slave |
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192 | node. Slave nodes cannot be contacted from outside, and cannot talk to |
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193 | each other (at least in this version of AnyEvent::MP). |
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194 | |
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195 | Slave nodes work by creating connections to all public nodes, using the |
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196 | L<AnyEvent::MP::Global> service. |
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197 | |
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198 | =back |
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199 | |
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200 | After initialising itself, the node will connect to all additional |
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201 | C<$seednodes> that are specified diretcly or via a profile. Seednodes are |
| 187 | optional and can be used to quickly bootstrap the node into an existing |
202 | optional and can be used to quickly bootstrap the node into an existing |
| 188 | network. |
203 | network. |
| 189 | |
204 | |
| 190 | =item slave nodes |
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| 191 | |
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| 192 | When the C<$noderef> (either as given or overriden by the config file) |
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| 193 | is the special string C<slave/>, then the node will become a slave |
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| 194 | node. Slave nodes cannot be contacted from outside and will route most of |
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| 195 | their traffic to the master node that they attach to. |
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| 196 | |
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| 197 | At least one additional noderef is required (either by specifying it |
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| 198 | directly or because it is part of the configuration profile): The node |
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| 199 | will try to connect to all of them and will become a slave attached to the |
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| 200 | first node it can successfully connect to. |
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| 201 | |
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| 202 | Note that slave nodes cannot change their name, and consequently, their |
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| 203 | master, so if the master goes down, the slave node will not function well |
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| 204 | anymore until it can re-establish conenciton to its master. This makes |
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| 205 | slave nodes unsuitable for long-term nodes or fault-tolerant networks. |
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| 206 | |
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| 207 | =back |
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| 208 | |
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| 209 | This function will block until all nodes have been resolved and, for slave |
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| 210 | nodes, until it has successfully established a connection to a master |
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| 211 | server. |
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| 212 | |
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| 213 | All the seednodes will also be specially marked to automatically retry |
205 | All the seednodes will also be specially marked to automatically retry |
| 214 | connecting to them infinitely. |
206 | connecting to them indefinitely, so make sure that seednodes are really |
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207 | reliable and up (this might also change in the future). |
| 215 | |
208 | |
| 216 | Example: become a public node listening on the guessed noderef, or the one |
209 | Example: become a public node listening on the guessed noderef, or the one |
| 217 | specified via C<aemp> for the current node. This should be the most common |
210 | specified via C<aemp> for the current node. This should be the most common |
| 218 | form of invocation for "daemon"-type nodes. |
211 | form of invocation for "daemon"-type nodes. |
| 219 | |
212 | |
| … | |
… | |
| 221 | |
214 | |
| 222 | Example: become a slave node to any of the the seednodes specified via |
215 | Example: become a slave node to any of the the seednodes specified via |
| 223 | C<aemp>. This form is often used for commandline clients. |
216 | C<aemp>. This form is often used for commandline clients. |
| 224 | |
217 | |
| 225 | initialise_node "slave/"; |
218 | initialise_node "slave/"; |
| 226 | |
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| 227 | Example: become a slave node to any of the specified master servers. This |
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| 228 | form is also often used for commandline clients. |
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| 229 | |
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| 230 | initialise_node "slave/", "master1", "192.168.13.17", "mp.example.net"; |
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| 231 | |
219 | |
| 232 | Example: become a public node, and try to contact some well-known master |
220 | Example: become a public node, and try to contact some well-known master |
| 233 | servers to become part of the network. |
221 | servers to become part of the network. |
| 234 | |
222 | |
| 235 | initialise_node undef, "master1", "master2"; |
223 | initialise_node undef, "master1", "master2"; |
| … | |
… | |
| 396 | |
384 | |
| 397 | sub rcv($@) { |
385 | sub rcv($@) { |
| 398 | my $port = shift; |
386 | my $port = shift; |
| 399 | my ($noderef, $portid) = split /#/, $port, 2; |
387 | my ($noderef, $portid) = split /#/, $port, 2; |
| 400 | |
388 | |
| 401 | ($NODE{$noderef} || add_node $noderef) == $NODE{""} |
389 | $NODE{$noderef} == $NODE{""} |
| 402 | or Carp::croak "$port: rcv can only be called on local ports, caught"; |
390 | or Carp::croak "$port: rcv can only be called on local ports, caught"; |
| 403 | |
391 | |
| 404 | while (@_) { |
392 | while (@_) { |
| 405 | if (ref $_[0]) { |
393 | if (ref $_[0]) { |
| 406 | if (my $self = $PORT_DATA{$portid}) { |
394 | if (my $self = $PORT_DATA{$portid}) { |
| … | |
… | |
| 505 | message loss has been detected. No messages will be lost "in between" |
493 | message loss has been detected. No messages will be lost "in between" |
| 506 | (after the first lost message no further messages will be received by the |
494 | (after the first lost message no further messages will be received by the |
| 507 | port). After the monitoring action was invoked, further messages might get |
495 | port). After the monitoring action was invoked, further messages might get |
| 508 | delivered again. |
496 | delivered again. |
| 509 | |
497 | |
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498 | Note that monitoring-actions are one-shot: once released, they are removed |
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499 | and will not trigger again. |
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500 | |
| 510 | In the first form (callback), the callback is simply called with any |
501 | In the first form (callback), the callback is simply called with any |
| 511 | number of C<@reason> elements (no @reason means that the port was deleted |
502 | number of C<@reason> elements (no @reason means that the port was deleted |
| 512 | "normally"). Note also that I<< the callback B<must> never die >>, so use |
503 | "normally"). Note also that I<< the callback B<must> never die >>, so use |
| 513 | C<eval> if unsure. |
504 | C<eval> if unsure. |
| 514 | |
505 | |
| … | |
… | |
| 679 | snd_to_func $noderef, "AnyEvent::MP::_spawn" => $id, @_; |
670 | snd_to_func $noderef, "AnyEvent::MP::_spawn" => $id, @_; |
| 680 | |
671 | |
| 681 | "$noderef#$id" |
672 | "$noderef#$id" |
| 682 | } |
673 | } |
| 683 | |
674 | |
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675 | =item after $timeout, @msg |
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676 | |
|
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677 | =item after $timeout, $callback |
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678 | |
|
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679 | Either sends the given message, or call the given callback, after the |
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680 | specified number of seconds. |
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681 | |
|
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682 | This is simply a utility function that come sin handy at times. |
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683 | |
|
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684 | =cut |
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685 | |
|
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686 | sub after($@) { |
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687 | my ($timeout, @action) = @_; |
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688 | |
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689 | my $t; $t = AE::timer $timeout, 0, sub { |
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690 | undef $t; |
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691 | ref $action[0] |
|
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692 | ? $action[0]() |
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693 | : snd @action; |
|
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694 | }; |
|
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695 | } |
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696 | |
| 684 | =back |
697 | =back |
| 685 | |
698 | |
| 686 | =head1 AnyEvent::MP vs. Distributed Erlang |
699 | =head1 AnyEvent::MP vs. Distributed Erlang |
| 687 | |
700 | |
| 688 | AnyEvent::MP got lots of its ideas from distributed Erlang (Erlang node |
701 | AnyEvent::MP got lots of its ideas from distributed Erlang (Erlang node |
