[ViewVC] Diff of: cvs/AnyEvent-MP/MP.pm

Comparing AnyEvent-MP/MP.pm (file contents):
Revision 1.47 by root, Thu Aug 13 01:57:10 2009 UTC vs.
Revision 1.60 by root, Mon Aug 24 08:04:52 2009 UTC

…		…
9	$NODE # contains this node's noderef	9	$NODE # contains this node's noderef
10	NODE # returns this node's noderef	10	NODE # returns this node's noderef
11	NODE $port # returns the noderef of the port	11	NODE $port # returns the noderef of the port
12		12
13	$SELF # receiving/own port id in rcv callbacks	13	$SELF # receiving/own port id in rcv callbacks
		14
		15	# initialise the node so it can send/receive messages
		16	initialise_node; # -OR-
		17	initialise_node "localhost:4040"; # -OR-
		18	initialise_node "slave/", "localhost:4040"
14		19
15	# ports are message endpoints	20	# ports are message endpoints
16		21
17	# sending messages	22	# sending messages
18	snd $port, type => data...;	23	snd $port, type => data...;
19	snd $port, @msg;	24	snd $port, @msg;
20	snd @msg_with_first_element_being_a_port;	25	snd @msg_with_first_element_being_a_port;
21		26
22	# miniports	27	# creating/using ports, the simple way
23	my $miniport = port { my @msg = @_; 0 };	28	my $simple_port = port { my @msg = @_; 0 };
24		29
25	# full ports	30	# creating/using ports, tagged message matching
26	my $port = port;	31	my $port = port;
27	rcv $port, smartmatch => $cb->(@msg);
28	rcv $port, ping => sub { snd $_[0], "pong"; 0 };	32	rcv $port, ping => sub { snd $_[0], "pong"; 0 };
29	rcv $port, pong => sub { warn "pong received\n"; 0 };	33	rcv $port, pong => sub { warn "pong received\n"; 0 };
30		34
31	# remote ports	35	# create a port on another node
32	my $port = spawn $node, $initfunc, @initdata;	36	my $port = spawn $node, $initfunc, @initdata;
33
34	# more, smarter, matches (_any_ is exported by this module)
35	rcv $port, [child_died => $pid] => sub { ...
36	rcv $port, [_any_, _any_, 3] => sub { .. $_[2] is 3
37		37
38	# monitoring	38	# monitoring
39	mon $port, $cb->(@msg) # callback is invoked on death	39	mon $port, $cb->(@msg) # callback is invoked on death
40	mon $port, $otherport # kill otherport on abnormal death	40	mon $port, $otherport # kill otherport on abnormal death
41	mon $port, $otherport, @msg # send message on death	41	mon $port, $otherport, @msg # send message on death
…		…
69		69
70	=item port	70	=item port
71		71
72	A port is something you can send messages to (with the C<snd> function).	72	A port is something you can send messages to (with the C<snd> function).
73		73
74	Some ports allow you to register C<rcv> handlers that can match specific	74	Ports allow you to register C<rcv> handlers that can match all or just
75	messages. All C<rcv> handlers will receive messages they match, messages	75	some messages. Messages will not be queued.
76	will not be queued.
77		76
78	=item port id - C<noderef#portname>	77	=item port id - C<noderef#portname>
79		78
80	A port id is normaly the concatenation of a noderef, a hash-mark (C<#>) as	79	A port ID is the concatenation of a noderef, a hash-mark (C<#>) as
81	separator, and a port name (a printable string of unspecified format). An	80	separator, and a port name (a printable string of unspecified format). An
82	exception is the the node port, whose ID is identical to its node	81	exception is the the node port, whose ID is identical to its node
83	reference.	82	reference.
84		83
85	=item node	84	=item node
86		85
87	A node is a single process containing at least one port - the node	86	A node is a single process containing at least one port - the node port,
88	port. You can send messages to node ports to find existing ports or to	87	which provides nodes to manage each other remotely, and to create new
89	create new ports, among other things.	88	ports.
90		89
91	Nodes are either private (single-process only), slaves (connected to a	90	Nodes are either private (single-process only), slaves (connected to a
92	master node only) or public nodes (connectable from unrelated nodes).	91	master node only) or public nodes (connectable from unrelated nodes).
93		92
94	=item noderef - C<host:port,host:port...>, C<id@noderef>, C<id>	93	=item noderef - C<host:port,host:port...>, C<id@noderef>, C<id>
…		…
127	use base "Exporter";	126	use base "Exporter";
128		127
129	our $VERSION = $AnyEvent::MP::Kernel::VERSION;	128	our $VERSION = $AnyEvent::MP::Kernel::VERSION;
130		129
131	our @EXPORT = qw(	130	our @EXPORT = qw(
132	NODE $NODE *SELF node_of _any_	131	NODE $NODE *SELF node_of after
133	resolve_node initialise_node	132	resolve_node initialise_node
134	snd rcv mon kil reg psub spawn	133	snd rcv mon mob_guard kil reg psub spawn
135	port	134	port
136	);	135	);
137		136
138	our $SELF;	137	our $SELF;
139		138
…		…
143	kil $SELF, die => $msg;	142	kil $SELF, die => $msg;
144	}	143	}
145		144
146	=item $thisnode = NODE / $NODE	145	=item $thisnode = NODE / $NODE
147		146
148	The C<NODE> function returns, and the C<$NODE> variable contains	147	The C<NODE> function returns, and the C<$NODE> variable contains the
149	the noderef of the local node. The value is initialised by a call	148	noderef of the local node. The value is initialised by a call to
150	to C<become_public> or C<become_slave>, after which all local port	149	C<initialise_node>.
151	identifiers become invalid.
152		150
153	=item $noderef = node_of $port	151	=item $noderef = node_of $port
154		152
155	Extracts and returns the noderef from a portid or a noderef.	153	Extracts and returns the noderef from a port ID or a noderef.
156		154
157	=item initialise_node $noderef, $seednode, $seednode...	155	=item initialise_node $noderef, $seednode, $seednode...
158		156
159	=item initialise_node "slave/", $master, $master...	157	=item initialise_node "slave/", $master, $master...
160		158
…		…
163	it should know the noderefs of some other nodes in the network.	161	it should know the noderefs of some other nodes in the network.
164		162
165	This function initialises a node - it must be called exactly once (or	163	This function initialises a node - it must be called exactly once (or
166	never) before calling other AnyEvent::MP functions.	164	never) before calling other AnyEvent::MP functions.
167		165
168	All arguments are noderefs, which can be either resolved or unresolved.	166	All arguments (optionally except for the first) are noderefs, which can be
		167	either resolved or unresolved.
		168
		169	The first argument will be looked up in the configuration database first
		170	(if it is C<undef> then the current nodename will be used instead) to find
		171	the relevant configuration profile (see L<aemp>). If none is found then
		172	the default configuration is used. The configuration supplies additional
		173	seed/master nodes and can override the actual noderef.
169		174
170	There are two types of networked nodes, public nodes and slave nodes:	175	There are two types of networked nodes, public nodes and slave nodes:
171		176
172	=over 4	177	=over 4
173		178
174	=item public nodes	179	=item public nodes
175		180
176	For public nodes, C<$noderef> must either be a (possibly unresolved)	181	For public nodes, C<$noderef> (supplied either directly to
177	noderef, in which case it will be resolved, or C<undef> (or missing), in	182	C<initialise_node> or indirectly via a profile or the nodename) must be a
178	which case the noderef will be guessed.	183	noderef (possibly unresolved, in which case it will be resolved).
179		184
180	Afterwards, the node will bind itself on all endpoints and try to connect	185	After resolving, the node will bind itself on all endpoints and try to
181	to all additional C<$seednodes> that are specified. Seednodes are optional	186	connect to all additional C<$seednodes> that are specified. Seednodes are
182	and can be used to quickly bootstrap the node into an existing network.	187	optional and can be used to quickly bootstrap the node into an existing
		188	network.
183		189
184	=item slave nodes	190	=item slave nodes
185		191
186	When the C<$noderef> is the special string C<slave/>, then the node will	192	When the C<$noderef> (either as given or overriden by the config file)
		193	is the special string C<slave/>, then the node will become a slave
187	become a slave node. Slave nodes cannot be contacted from outside and will	194	node. Slave nodes cannot be contacted from outside and will route most of
188	route most of their traffic to the master node that they attach to.	195	their traffic to the master node that they attach to.
189		196
190	At least one additional noderef is required: The node will try to connect	197	At least one additional noderef is required (either by specifying it
191	to all of them and will become a slave attached to the first node it can	198	directly or because it is part of the configuration profile): The node
192	successfully connect to.	199	will try to connect to all of them and will become a slave attached to the
		200	first node it can successfully connect to.
		201
		202	Note that slave nodes cannot change their name, and consequently, their
		203	master, so if the master goes down, the slave node will not function well
		204	anymore until it can re-establish conenciton to its master. This makes
		205	slave nodes unsuitable for long-term nodes or fault-tolerant networks.
193		206
194	=back	207	=back
195		208
196	This function will block until all nodes have been resolved and, for slave	209	This function will block until all nodes have been resolved and, for slave
197	nodes, until it has successfully established a connection to a master	210	nodes, until it has successfully established a connection to a master
198	server.	211	server.
199		212
		213	All the seednodes will also be specially marked to automatically retry
		214	connecting to them infinitely.
		215
200	Example: become a public node listening on the default node.	216	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
		218	form of invocation for "daemon"-type nodes.
201		219
202	initialise_node;	220	initialise_node;
		221
		222	Example: become a slave node to any of the the seednodes specified via
		223	C<aemp>. This form is often used for commandline clients.
		224
		225	initialise_node "slave/";
		226
		227	Example: become a slave node to any of the specified master servers. This
		228	form is also often used for commandline clients.
		229
		230	initialise_node "slave/", "master1", "192.168.13.17", "mp.example.net";
203		231
204	Example: become a public node, and try to contact some well-known master	232	Example: become a public node, and try to contact some well-known master
205	servers to become part of the network.	233	servers to become part of the network.
206		234
207	initialise_node undef, "master1", "master2";	235	initialise_node undef, "master1", "master2";
…		…
210		238
211	initialise_node 4041;	239	initialise_node 4041;
212		240
213	Example: become a public node, only visible on localhost port 4044.	241	Example: become a public node, only visible on localhost port 4044.
214		242
215	initialise_node "locahost:4044";	243	initialise_node "localhost:4044";
216
217	Example: become a slave node to any of the specified master servers.
218
219	initialise_node "slave/", "master1", "192.168.13.17", "mp.example.net";
220		244
221	=item $cv = resolve_node $noderef	245	=item $cv = resolve_node $noderef
222		246
223	Takes an unresolved node reference that may contain hostnames and	247	Takes an unresolved node reference that may contain hostnames and
224	abbreviated IDs, resolves all of them and returns a resolved node	248	abbreviated IDs, resolves all of them and returns a resolved node
…		…
261	=item snd $port, type => @data	285	=item snd $port, type => @data
262		286
263	=item snd $port, @msg	287	=item snd $port, @msg
264		288
265	Send the given message to the given port ID, which can identify either	289	Send the given message to the given port ID, which can identify either
266	a local or a remote port, and can be either a string or soemthignt hat	290	a local or a remote port, and must be a port ID.
267	stringifies a sa port ID (such as a port object :).
268		291
269	While the message can be about anything, it is highly recommended to use a	292	While the message can be about anything, it is highly recommended to use a
270	string as first element (a portid, or some word that indicates a request	293	string as first element (a port ID, or some word that indicates a request
271	type etc.).	294	type etc.).
272		295
273	The message data effectively becomes read-only after a call to this	296	The message data effectively becomes read-only after a call to this
274	function: modifying any argument is not allowed and can cause many	297	function: modifying any argument is not allowed and can cause many
275	problems.	298	problems.
…		…
280	that Storable can serialise and deserialise is allowed, and for the local	303	that Storable can serialise and deserialise is allowed, and for the local
281	node, anything can be passed.	304	node, anything can be passed.
282		305
283	=item $local_port = port	306	=item $local_port = port
284		307
285	Create a new local port object that can be used either as a pattern	308	Create a new local port object and returns its port ID. Initially it has
286	matching port ("full port") or a single-callback port ("miniport"),	309	no callbacks set and will throw an error when it receives messages.
287	depending on how C<rcv> callbacks are bound to the object.
288		310
289	=item $port = port { my @msg = @_; $finished }	311	=item $local_port = port { my @msg = @_ }
290		312
291	Creates a "miniport", that is, a very lightweight port without any pattern	313	Creates a new local port, and returns its ID. Semantically the same as
292	matching behind it, and returns its ID. Semantically the same as creating
293	a port and calling C<rcv $port, $callback> on it.	314	creating a port and calling C<rcv $port, $callback> on it.
294		315
295	The block will be called for every message received on the port. When the	316	The block will be called for every message received on the port, with the
296	callback returns a true value its job is considered "done" and the port	317	global variable C<$SELF> set to the port ID. Runtime errors will cause the
297	will be destroyed. Otherwise it will stay alive.	318	port to be C<kil>ed. The message will be passed as-is, no extra argument
		319	(i.e. no port ID) will be passed to the callback.
298		320
299	The message will be passed as-is, no extra argument (i.e. no port id) will	321	If you want to stop/destroy the port, simply C<kil> it:
300	be passed to the callback.
301		322
302	If you need the local port id in the callback, this works nicely:	323	my $port = port {
303		324	my @msg = @_;
304	my $port; $port = port {	325	...
305	snd $otherport, reply => $port;	326	kil $SELF;
306	};	327	};
307		328
308	=cut	329	=cut
309		330
310	sub rcv($@);	331	sub rcv($@);
		332
		333	sub _kilme {
		334	die "received message on port without callback";
		335	}
311		336
312	sub port(;&) {	337	sub port(;&) {
313	my $id = "$UNIQ." . $ID++;	338	my $id = "$UNIQ." . $ID++;
314	my $port = "$NODE#$id";	339	my $port = "$NODE#$id";
315		340
316	if (@_) {	341	rcv $port, shift \|\| \&_kilme;
317	rcv $port, shift;
318	} else {
319	$PORT{$id} = sub { }; # nop
320	}
321		342
322	$port	343	$port
323	}	344	}
324		345
325	=item reg $port, $name
326
327	=item reg $name
328
329	Registers the given port (or C<$SELF><<< if missing) under the name
330	C<$name>. If the name already exists it is replaced.
331
332	A port can only be registered under one well known name.
333
334	A port automatically becomes unregistered when it is killed.
335
336	=cut
337
338	sub reg(@) {
339	my $port = @_ > 1 ? shift : $SELF \|\| Carp::croak 'reg: called with one argument only, but $SELF not set,';
340
341	$REG{$_[0]} = $port;
342	}
343
344	=item rcv $port, $callback->(@msg)	346	=item rcv $local_port, $callback->(@msg)
345		347
346	Replaces the callback on the specified miniport (after converting it to	348	Replaces the default callback on the specified port. There is no way to
347	one if required).	349	remove the default callback: use C<sub { }> to disable it, or better
348		350	C<kil> the port when it is no longer needed.
349	=item rcv $port, tagstring => $callback->(@msg), ...
350
351	=item rcv $port, $smartmatch => $callback->(@msg), ...
352
353	=item rcv $port, [$smartmatch...] => $callback->(@msg), ...
354
355	Register callbacks to be called on matching messages on the given full
356	port (after converting it to one if required) and return the port.
357
358	The callback has to return a true value when its work is done, after
359	which is will be removed, or a false value in which case it will stay
360	registered.
361		351
362	The global C<$SELF> (exported by this module) contains C<$port> while	352	The global C<$SELF> (exported by this module) contains C<$port> while
363	executing the callback.	353	executing the callback. Runtime errors during callback execution will
		354	result in the port being C<kil>ed.
364		355
365	Runtime errors during callback execution will result in the port being	356	The default callback received all messages not matched by a more specific
366	C<kil>ed.	357	C<tag> match.
367		358
368	If the match is an array reference, then it will be matched against the	359	=item rcv $local_port, tag => $callback->(@msg_without_tag), ...
369	first elements of the message, otherwise only the first element is being
370	matched.
371		360
372	Any element in the match that is specified as C<_any_> (a function	361	Register (or replace) callbacks to be called on messages starting with the
373	exported by this module) matches any single element of the message.	362	given tag on the given port (and return the port), or unregister it (when
		363	C<$callback> is C<$undef> or missing). There can only be one callback
		364	registered for each tag.
374		365
375	While not required, it is highly recommended that the first matching	366	The original message will be passed to the callback, after the first
376	element is a string identifying the message. The one-string-only match is	367	element (the tag) has been removed. The callback will use the same
377	also the most efficient match (by far).	368	environment as the default callback (see above).
378		369
379	Example: create a port and bind receivers on it in one go.	370	Example: create a port and bind receivers on it in one go.
380		371
381	my $port = rcv port,	372	my $port = rcv port,
382	msg1 => sub { ...; 0 },	373	msg1 => sub { ... },
383	msg2 => sub { ...; 0 },	374	msg2 => sub { ... },
384	;	375	;
385		376
386	Example: create a port, bind receivers and send it in a message elsewhere	377	Example: create a port, bind receivers and send it in a message elsewhere
387	in one go:	378	in one go:
388		379
389	snd $otherport, reply =>	380	snd $otherport, reply =>
390	rcv port,	381	rcv port,
391	msg1 => sub { ...; 0 },	382	msg1 => sub { ... },
392	...	383	...
393	;	384	;
		385
		386	Example: temporarily register a rcv callback for a tag matching some port
		387	(e.g. for a rpc reply) and unregister it after a message was received.
		388
		389	rcv $port, $otherport => sub {
		390	my @reply = @_;
		391
		392	rcv $SELF, $otherport;
		393	};
394		394
395	=cut	395	=cut
396		396
397	sub rcv($@) {	397	sub rcv($@) {
398	my $port = shift;	398	my $port = shift;
399	my ($noderef, $portid) = split /#/, $port, 2;	399	my ($noderef, $portid) = split /#/, $port, 2;
400		400
401	($NODE{$noderef} \|\| add_node $noderef) == $NODE{""}	401	$NODE{$noderef} == $NODE{""}
402	or Carp::croak "$port: rcv can only be called on local ports, caught";	402	or Carp::croak "$port: rcv can only be called on local ports, caught";
403		403
404	if (@_ == 1) {	404	while (@_) {
		405	if (ref $_[0]) {
		406	if (my $self = $PORT_DATA{$portid}) {
		407	"AnyEvent::MP::Port" eq ref $self
		408	or Carp::croak "$port: rcv can only be called on message matching ports, caught";
		409
		410	$self->[2] = shift;
		411	} else {
405	my $cb = shift;	412	my $cb = shift;
406	delete $PORT_DATA{$portid};
407	$PORT{$portid} = sub {	413	$PORT{$portid} = sub {
408	local $SELF = $port;	414	local $SELF = $port;
409	eval {	415	eval { &$cb }; _self_die if $@;
410	&$cb	416	};
411	and kil $port;
412	};	417	}
413	_self_die if $@;	418	} elsif (defined $_[0]) {
414	};
415	} else {
416	my $self = $PORT_DATA{$portid} \|\|= do {	419	my $self = $PORT_DATA{$portid} \|\|= do {
417	my $self = bless {	420	my $self = bless [$PORT{$port} \|\| sub { }, { }, $port], "AnyEvent::MP::Port";
418	id => $port,
419	}, "AnyEvent::MP::Port";
420		421
421	$PORT{$portid} = sub {	422	$PORT{$portid} = sub {
422	local $SELF = $port;	423	local $SELF = $port;
423		424
424	eval {
425	for (@{ $self->{rc0}{$_[0]} }) {	425	if (my $cb = $self->[1]{$_[0]}) {
426	$_ && &{$_->[0]}	426	shift;
427	&& undef $_;	427	eval { &$cb }; _self_die if $@;
428	}	428	} else {
429
430	for (@{ $self->{rcv}{$_[0]} }) {
431	$_ && [@_[1 .. @{$_->[1]}]] ~~ $_->[1]
432	&& &{$_->[0]}	429	&{ $self->[0] };
433	&& undef $_;
434	}
435
436	for (@{ $self->{any} }) {
437	$_ && [@_[0 .. $#{$_->[1]}]] ~~ $_->[1]
438	&& &{$_->[0]}
439	&& undef $_;
440	}	430	}
441	};	431	};
442	_self_die if $@;	432
		433	$self
443	};	434	};
444		435
445	$self
446	};
447
448	"AnyEvent::MP::Port" eq ref $self	436	"AnyEvent::MP::Port" eq ref $self
449	or Carp::croak "$port: rcv can only be called on message matching ports, caught";	437	or Carp::croak "$port: rcv can only be called on message matching ports, caught";
450		438
451	while (@_) {
452	my ($match, $cb) = splice @_, 0, 2;	439	my ($tag, $cb) = splice @_, 0, 2;
453		440
454	if (!ref $match) {	441	if (defined $cb) {
455	push @{ $self->{rc0}{$match} }, [$cb];	442	$self->[1]{$tag} = $cb;
456	} elsif (("ARRAY" eq ref $match && !ref $match->[0])) {
457	my ($type, @match) = @$match;
458	@match
459	? push @{ $self->{rcv}{$match->[0]} }, [$cb, \@match]
460	: push @{ $self->{rc0}{$match->[0]} }, [$cb];
461	} else {	443	} else {
462	push @{ $self->{any} }, [$cb, $match];	444	delete $self->[1]{$tag};
463	}	445	}
464	}	446	}
465	}	447	}
466		448
467	$port	449	$port
…		…
522	will arrive, or the monitoring action will be invoked after possible	504	will arrive, or the monitoring action will be invoked after possible
523	message loss has been detected. No messages will be lost "in between"	505	message loss has been detected. No messages will be lost "in between"
524	(after the first lost message no further messages will be received by the	506	(after the first lost message no further messages will be received by the
525	port). After the monitoring action was invoked, further messages might get	507	port). After the monitoring action was invoked, further messages might get
526	delivered again.	508	delivered again.
		509
		510	Note that monitoring-actions are one-shot: once released, they are removed
		511	and will not trigger again.
527		512
528	In the first form (callback), the callback is simply called with any	513	In the first form (callback), the callback is simply called with any
529	number of C<@reason> elements (no @reason means that the port was deleted	514	number of C<@reason> elements (no @reason means that the port was deleted
530	"normally"). Note also that I<< the callback B<must> never die >>, so use	515	"normally"). Note also that I<< the callback B<must> never die >>, so use
531	C<eval> if unsure.	516	C<eval> if unsure.
…		…
692	my $id = "$RUNIQ." . $ID++;	677	my $id = "$RUNIQ." . $ID++;
693		678
694	$_[0] =~ /::/	679	$_[0] =~ /::/
695	or Carp::croak "spawn init function must be a fully-qualified name, caught";	680	or Carp::croak "spawn init function must be a fully-qualified name, caught";
696		681
697	($NODE{$noderef} \|\| add_node $noderef)	682	snd_to_func $noderef, "AnyEvent::MP::_spawn" => $id, @_;
698	->send (["", "AnyEvent::MP::_spawn" => $id, @_]);
699		683
700	"$noderef#$id"	684	"$noderef#$id"
701	}	685	}
702		686
703	=back	687	=item after $timeout, @msg
704		688
705	=head1 NODE MESSAGES	689	=item after $timeout, $callback
706		690
707	Nodes understand the following messages sent to them. Many of them take	691	Either sends the given message, or call the given callback, after the
708	arguments called C<@reply>, which will simply be used to compose a reply	692	specified number of seconds.
709	message - C<$reply[0]> is the port to reply to, C<$reply[1]> the type and
710	the remaining arguments are simply the message data.
711		693
712	While other messages exist, they are not public and subject to change.	694	This is simply a utility function that come sin handy at times.
713		695
714	=over 4
715
716	=cut	696	=cut
717		697
718	=item lookup => $name, @reply	698	sub after($@) {
		699	my ($timeout, @action) = @_;
719		700
720	Replies with the port ID of the specified well-known port, or C<undef>.	701	my $t; $t = AE::timer $timeout, 0, sub {
721		702	undef $t;
722	=item devnull => ...	703	ref $action[0]
723		704	? $action[0]()
724	Generic data sink/CPU heat conversion.	705	: snd @action;
725		706	};
726	=item relay => $port, @msg	707	}
727
728	Simply forwards the message to the given port.
729
730	=item eval => $string[ @reply]
731
732	Evaluates the given string. If C<@reply> is given, then a message of the
733	form C<@reply, $@, @evalres> is sent.
734
735	Example: crash another node.
736
737	snd $othernode, eval => "exit";
738
739	=item time => @reply
740
741	Replies the the current node time to C<@reply>.
742
743	Example: tell the current node to send the current time to C<$myport> in a
744	C<timereply> message.
745
746	snd $NODE, time => $myport, timereply => 1, 2;
747	# => snd $myport, timereply => 1, 2, <time>
748		708
749	=back	709	=back
750		710
751	=head1 AnyEvent::MP vs. Distributed Erlang	711	=head1 AnyEvent::MP vs. Distributed Erlang
752		712
…		…
771	convenience functionality.	731	convenience functionality.
772		732
773	This means that AEMP requires a less tightly controlled environment at the	733	This means that AEMP requires a less tightly controlled environment at the
774	cost of longer node references and a slightly higher management overhead.	734	cost of longer node references and a slightly higher management overhead.
775		735
		736	=item * Erlang has a "remote ports are like local ports" philosophy, AEMP
		737	uses "local ports are like remote ports".
		738
		739	The failure modes for local ports are quite different (runtime errors
		740	only) then for remote ports - when a local port dies, you I<know> it dies,
		741	when a connection to another node dies, you know nothing about the other
		742	port.
		743
		744	Erlang pretends remote ports are as reliable as local ports, even when
		745	they are not.
		746
		747	AEMP encourages a "treat remote ports differently" philosophy, with local
		748	ports being the special case/exception, where transport errors cannot
		749	occur.
		750
776	=item * Erlang uses processes and a mailbox, AEMP does not queue.	751	=item * Erlang uses processes and a mailbox, AEMP does not queue.
777		752
778	Erlang uses processes that selctively receive messages, and therefore	753	Erlang uses processes that selectively receive messages, and therefore
779	needs a queue. AEMP is event based, queuing messages would serve no useful	754	needs a queue. AEMP is event based, queuing messages would serve no
780	purpose.	755	useful purpose. For the same reason the pattern-matching abilities of
		756	AnyEvent::MP are more limited, as there is little need to be able to
		757	filter messages without dequeing them.
781		758
782	(But see L<Coro::MP> for a more Erlang-like process model on top of AEMP).	759	(But see L<Coro::MP> for a more Erlang-like process model on top of AEMP).
783		760
784	=item * Erlang sends are synchronous, AEMP sends are asynchronous.	761	=item * Erlang sends are synchronous, AEMP sends are asynchronous.
785		762
786	Sending messages in Erlang is synchronous and blocks the process. AEMP	763	Sending messages in Erlang is synchronous and blocks the process (and
787	sends are immediate, connection establishment is handled in the	764	so does not need a queue that can overflow). AEMP sends are immediate,
788	background.	765	connection establishment is handled in the background.
789		766
790	=item * Erlang can silently lose messages, AEMP cannot.	767	=item * Erlang suffers from silent message loss, AEMP does not.
791		768
792	Erlang makes few guarantees on messages delivery - messages can get lost	769	Erlang makes few guarantees on messages delivery - messages can get lost
793	without any of the processes realising it (i.e. you send messages a, b,	770	without any of the processes realising it (i.e. you send messages a, b,
794	and c, and the other side only receives messages a and c).	771	and c, and the other side only receives messages a and c).
795		772
…		…
807	eventually be killed - it cannot happen that a node detects a port as dead	784	eventually be killed - it cannot happen that a node detects a port as dead
808	and then later sends messages to it, finding it is still alive.	785	and then later sends messages to it, finding it is still alive.
809		786
810	=item * Erlang can send messages to the wrong port, AEMP does not.	787	=item * Erlang can send messages to the wrong port, AEMP does not.
811		788
812	In Erlang it is quite possible that a node that restarts reuses a process	789	In Erlang it is quite likely that a node that restarts reuses a process ID
813	ID known to other nodes for a completely different process, causing	790	known to other nodes for a completely different process, causing messages
814	messages destined for that process to end up in an unrelated process.	791	destined for that process to end up in an unrelated process.
815		792
816	AEMP never reuses port IDs, so old messages or old port IDs floating	793	AEMP never reuses port IDs, so old messages or old port IDs floating
817	around in the network will not be sent to an unrelated port.	794	around in the network will not be sent to an unrelated port.
818		795
819	=item * Erlang uses unprotected connections, AEMP uses secure	796	=item * Erlang uses unprotected connections, AEMP uses secure

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Comparing AnyEvent-MP/MP.pm (file contents): Revision 1.47 by root, Thu Aug 13 01:57:10 2009 UTC vs. Revision 1.60 by root, Mon Aug 24 08:04:52 2009 UTC

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Comparing AnyEvent-MP/MP.pm (file contents):
Revision 1.47 by root, Thu Aug 13 01:57:10 2009 UTC vs.
Revision 1.60 by root, Mon Aug 24 08:04:52 2009 UTC