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

Comparing AnyEvent-MP/MP.pm (file contents):
Revision 1.16 by root, Sun Aug 2 19:29:41 2009 UTC vs.
Revision 1.24 by root, Tue Aug 4 20:00:00 2009 UTC

…		…
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
7	use AnyEvent::MP;	7	use AnyEvent::MP;
8		8
9	NODE # returns this node identifier
10	$NODE # contains this node identifier	9	$NODE # contains this node's noderef
		10	NODE # returns this node's noderef
		11	NODE $port # returns the noderef of the port
11		12
12	snd $port, type => data...;	13	snd $port, type => data...;
		14
		15	$SELF # receiving/own port id in rcv callbacks
13		16
14	rcv $port, smartmatch => $cb->($port, @msg);	17	rcv $port, smartmatch => $cb->($port, @msg);
15		18
16	# examples:	19	# examples:
17	rcv $port2, ping => sub { snd $_[0], "pong"; 0 };	20	rcv $port2, ping => sub { snd $_[0], "pong"; 0 };
…		…
27	This module (-family) implements a simple message passing framework.	30	This module (-family) implements a simple message passing framework.
28		31
29	Despite its simplicity, you can securely message other processes running	32	Despite its simplicity, you can securely message other processes running
30	on the same or other hosts.	33	on the same or other hosts.
31		34
		35	For an introduction to this module family, see the L<AnyEvent::MP::Intro>
		36	manual page.
		37
32	At the moment, this module family is severly brokena nd underdocumented,	38	At the moment, this module family is severly broken and underdocumented,
33	so do not use. This was uploaded mainly to resreve the CPAN namespace -	39	so do not use. This was uploaded mainly to reserve the CPAN namespace -
34	stay tuned!	40	stay tuned! The basic API should be finished, however.
35		41
36	=head1 CONCEPTS	42	=head1 CONCEPTS
37		43
38	=over 4	44	=over 4
39		45
…		…
84		90
85	use base "Exporter";	91	use base "Exporter";
86		92
87	our $VERSION = '0.02';	93	our $VERSION = '0.02';
88	our @EXPORT = qw(	94	our @EXPORT = qw(
89	NODE $NODE $PORT snd rcv _any_	95	NODE $NODE *SELF node_of _any_
90	create_port create_port_on
91	create_miniport
92	become_slave become_public	96	become_slave become_public
		97	snd rcv mon kil reg psub
		98	port
93	);	99	);
94		100
		101	our $SELF;
		102
		103	sub _self_die() {
		104	my $msg = $@;
		105	$msg =~ s/\n+$// unless ref $msg;
		106	kil $SELF, die => $msg;
		107	}
		108
95	=item NODE / $NODE	109	=item $thisnode = NODE / $NODE
96		110
97	The C<NODE ()> function and the C<$NODE> variable contain the noderef of	111	The C<NODE> function returns, and the C<$NODE> variable contains
98	the local node. The value is initialised by a call to C<become_public> or	112	the noderef of the local node. The value is initialised by a call
99	C<become_slave>, after which all local port identifiers become invalid.	113	to C<become_public> or C<become_slave>, after which all local port
		114	identifiers become invalid.
		115
		116	=item $noderef = node_of $portid
		117
		118	Extracts and returns the noderef from a portid or a noderef.
		119
		120	=item $SELF
		121
		122	Contains the current port id while executing C<rcv> callbacks or C<psub>
		123	blocks.
		124
		125	=item SELF, %SELF, @SELF...
		126
		127	Due to some quirks in how perl exports variables, it is impossible to
		128	just export C<$SELF>, all the symbols called C<SELF> are exported by this
		129	module, but only C<$SELF> is currently used.
100		130
101	=item snd $portid, type => @data	131	=item snd $portid, type => @data
102		132
103	=item snd $portid, @msg	133	=item snd $portid, @msg
104		134
…		…
118	JSON is used, then only strings, numbers and arrays and hashes consisting	148	JSON is used, then only strings, numbers and arrays and hashes consisting
119	of those are allowed (no objects). When Storable is used, then anything	149	of those are allowed (no objects). When Storable is used, then anything
120	that Storable can serialise and deserialise is allowed, and for the local	150	that Storable can serialise and deserialise is allowed, and for the local
121	node, anything can be passed.	151	node, anything can be passed.
122		152
123	=item $local_port = create_port	153	=item kil $portid[, @reason]
124		154
125	Create a new local port object. See the next section for allowed methods.	155	Kill the specified port with the given C<@reason>.
126		156
127	=cut	157	If no C<@reason> is specified, then the port is killed "normally" (linked
		158	ports will not be kileld, or even notified).
128		159
129	sub create_port {	160	Otherwise, linked ports get killed with the same reason (second form of
130	my $id = "$AnyEvent::MP::Base::UNIQ." . $AnyEvent::MP::Base::ID++;	161	C<mon>, see below).
131		162
132	my $self = bless {	163	Runtime errors while evaluating C<rcv> callbacks or inside C<psub> blocks
133	id => "$NODE#$id",	164	will be reported as reason C<< die => $@ >>.
134	names => [$id],
135	}, "AnyEvent::MP::Port";
136		165
137	$AnyEvent::MP::Base::PORT{$id} = sub {	166	Transport/communication errors are reported as C<< transport_error =>
138	unshift @_, $self;	167	$message >>.
139		168
140	for (@{ $self->{rc0}{$_[1]} }) {	169	=item $guard = mon $portid, $cb->(@reason)
141	$_ && &{$_->[0]}	170
142	&& undef $_;	171	=item $guard = mon $portid, $otherport
		172
		173	=item $guard = mon $portid, $otherport, @msg
		174
		175	Monitor the given port and do something when the port is killed.
		176
		177	In the first form, the callback is simply called with any number
		178	of C<@reason> elements (no @reason means that the port was deleted
		179	"normally"). Note also that I<< the callback B<must> never die >>, so use
		180	C<eval> if unsure.
		181
		182	In the second form, the other port will be C<kil>'ed with C<@reason>, iff
		183	a @reason was specified, i.e. on "normal" kils nothing happens, while
		184	under all other conditions, the other port is killed with the same reason.
		185
		186	In the last form, a message of the form C<@msg, @reason> will be C<snd>.
		187
		188	Example: call a given callback when C<$port> is killed.
		189
		190	mon $port, sub { warn "port died because of <@_>\n" };
		191
		192	Example: kill ourselves when C<$port> is killed abnormally.
		193
		194	mon $port, $self;
		195
		196	Example: send us a restart message another C<$port> is killed.
		197
		198	mon $port, $self => "restart";
		199
		200	=cut
		201
		202	sub mon {
		203	my ($noderef, $port, $cb) = ((split /#/, shift, 2), shift);
		204
		205	my $node = $NODE{$noderef} \|\| add_node $noderef;
		206
		207	#TODO: ports must not be references
		208	if (!ref $cb or "AnyEvent::MP::Port" eq ref $cb) {
		209	if (@_) {
		210	# send a kill info message
		211	my (@msg) = ($cb, @_);
		212	$cb = sub { snd @msg, @_ };
		213	} else {
		214	# simply kill other port
		215	my $port = $cb;
		216	$cb = sub { kil $port, @_ if @_ };
143	}	217	}
144
145	for (@{ $self->{rcv}{$_[1]} }) {
146	$_ && [@_[1 .. @{$_->[1]}]] ~~ $_->[1]
147	&& &{$_->[0]}
148	&& undef $_;
149	}
150
151	for (@{ $self->{any} }) {
152	$_ && [@_[0 .. $#{$_->[1]}]] ~~ $_->[1]
153	&& &{$_->[0]}
154	&& undef $_;
155	}
156	};	218	}
157		219
158	$self	220	$node->monitor ($port, $cb);
159	}
160		221
		222	defined wantarray
		223	and AnyEvent::Util::guard { $node->unmonitor ($port, $cb) }
		224	}
		225
		226	=item $guard = mon_guard $port, $ref, $ref...
		227
		228	Monitors the given C<$port> and keeps the passed references. When the port
		229	is killed, the references will be freed.
		230
		231	Optionally returns a guard that will stop the monitoring.
		232
		233	This function is useful when you create e.g. timers or other watchers and
		234	want to free them when the port gets killed:
		235
		236	$port->rcv (start => sub {
		237	my $timer; $timer = mon_guard $port, AE::timer 1, 1, sub {
		238	undef $timer if 0.9 < rand;
		239	});
		240	});
		241
		242	=cut
		243
		244	sub mon_guard {
		245	my ($port, @refs) = @_;
		246
		247	mon $port, sub { 0 && @refs }
		248	}
		249
		250	=item lnk $port1, $port2
		251
		252	Link two ports. This is simply a shorthand for:
		253
		254	mon $port1, $port2;
		255	mon $port2, $port1;
		256
		257	It means that if either one is killed abnormally, the other one gets
		258	killed as well.
		259
		260	=item $local_port = port
		261
		262	Create a new local port object that supports message matching.
		263
161	=item $portid = miniport { my @msg = @_; $finished }	264	=item $portid = port { my @msg = @_; $finished }
162		265
163	Creates a "mini port", that is, a very lightweight port without any	266	Creates a "mini port", that is, a very lightweight port without any
164	pattern matching behind it, and returns its ID.	267	pattern matching behind it, and returns its ID.
165		268
166	The block will be called for every message received on the port. When the	269	The block will be called for every message received on the port. When the
167	callback returns a true value its job is considered "done" and the port	270	callback returns a true value its job is considered "done" and the port
168	will be destroyed. Otherwise it will stay alive.	271	will be destroyed. Otherwise it will stay alive.
169		272
170	The message will be passed as-is, no extra argument (ie.. no port id) will	273	The message will be passed as-is, no extra argument (i.e. no port id) will
171	be passed to the callback.	274	be passed to the callback.
172		275
173	If you need the local port id in the callback, this works nicely:	276	If you need the local port id in the callback, this works nicely:
174		277
175	my $port; $port = miniport {	278	my $port; $port = miniport {
176	snd $otherport, reply => $port;	279	snd $otherport, reply => $port;
177	};	280	};
178		281
179	=cut	282	=cut
180		283
181	sub miniport(&) {	284	sub port(;&) {
		285	my $id = "$UNIQ." . $ID++;
		286	my $port = "$NODE#$id";
		287
		288	if (@_) {
182	my $cb = shift;	289	my $cb = shift;
183	my $id = "$AnyEvent::MP::Base::UNIQ." . $AnyEvent::MP::Base::ID++;	290	$PORT{$id} = sub {
184		291	local $SELF = $port;
185	$AnyEvent::MP::Base::PORT{$id} = sub {	292	eval {
186	&$cb	293	&$cb
187	and delete $AnyEvent::MP::Base::PORT{$id};	294	and kil $id;
		295	};
		296	_self_die if $@;
		297	};
		298	} else {
		299	my $self = bless {
		300	id => "$NODE#$id",
		301	}, "AnyEvent::MP::Port";
		302
		303	$PORT_DATA{$id} = $self;
		304	$PORT{$id} = sub {
		305	local $SELF = $port;
		306
		307	eval {
		308	for (@{ $self->{rc0}{$_[0]} }) {
		309	$_ && &{$_->[0]}
		310	&& undef $_;
		311	}
		312
		313	for (@{ $self->{rcv}{$_[0]} }) {
		314	$_ && [@_[1 .. @{$_->[1]}]] ~~ $_->[1]
		315	&& &{$_->[0]}
		316	&& undef $_;
		317	}
		318
		319	for (@{ $self->{any} }) {
		320	$_ && [@_[0 .. $#{$_->[1]}]] ~~ $_->[1]
		321	&& &{$_->[0]}
		322	&& undef $_;
		323	}
		324	};
		325	_self_die if $@;
		326	};
188	};	327	}
189		328
190	"$NODE#$id"	329	$port
191	}	330	}
192		331
193	package AnyEvent::MP::Port;	332	=item reg $portid, $name
194		333
195	=back	334	Registers the given port under the name C<$name>. If the name already
		335	exists it is replaced.
196		336
197	=head1 METHODS FOR PORT OBJECTS	337	A port can only be registered under one well known name.
198		338
199	=over 4	339	A port automatically becomes unregistered when it is killed.
200		340
201	=item "$port"
202
203	A port object stringifies to its port ID, so can be used directly for
204	C<snd> operations.
205
206	=cut	341	=cut
207		342
208	use overload	343	sub reg(@) {
209	'""' => sub { $_[0]{id} },	344	my ($portid, $name) = @_;
210	fallback => 1;
211		345
212	=item $port->rcv (type => $callback->($port, @msg))	346	$REG{$name} = $portid;
		347	}
213		348
214	=item $port->rcv ($smartmatch => $callback->($port, @msg))	349	=item rcv $portid, tagstring => $callback->(@msg), ...
215		350
		351	=item rcv $portid, $smartmatch => $callback->(@msg), ...
		352
216	=item $port->rcv ([$smartmatch...] => $callback->($port, @msg))	353	=item rcv $portid, [$smartmatch...] => $callback->(@msg), ...
217		354
218	Register a callback on the given port.	355	Register callbacks to be called on matching messages on the given port.
219		356
220	The callback has to return a true value when its work is done, after	357	The callback has to return a true value when its work is done, after
221	which is will be removed, or a false value in which case it will stay	358	which is will be removed, or a false value in which case it will stay
222	registered.	359	registered.
223		360
		361	The global C<$SELF> (exported by this module) contains C<$portid> while
		362	executing the callback.
		363
		364	Runtime errors wdurign callback execution will result in the port being
		365	C<kil>ed.
		366
224	If the match is an array reference, then it will be matched against the	367	If the match is an array reference, then it will be matched against the
225	first elements of the message, otherwise only the first element is being	368	first elements of the message, otherwise only the first element is being
226	matched.	369	matched.
227		370
228	Any element in the match that is specified as C<_any_> (a function	371	Any element in the match that is specified as C<_any_> (a function
…		…
233	also the most efficient match (by far).	376	also the most efficient match (by far).
234		377
235	=cut	378	=cut
236		379
237	sub rcv($@) {	380	sub rcv($@) {
238	my ($self, $match, $cb) = @_;	381	my ($noderef, $port) = split /#/, shift, 2;
239		382
		383	($NODE{$noderef} \|\| add_node $noderef) == $NODE{""}
		384	or Carp::croak "$noderef#$port: rcv can only be called on local ports, caught";
		385
		386	my $self = $PORT_DATA{$port}
		387	or Carp::croak "$noderef#$port: rcv can only be called on message matching ports, caught";
		388
		389	"AnyEvent::MP::Port" eq ref $self
		390	or Carp::croak "$noderef#$port: rcv can only be called on message matching ports, caught";
		391
		392	while (@_) {
		393	my ($match, $cb) = splice @_, 0, 2;
		394
240	if (!ref $match) {	395	if (!ref $match) {
241	push @{ $self->{rc0}{$match} }, [$cb];	396	push @{ $self->{rc0}{$match} }, [$cb];
242	} elsif (("ARRAY" eq ref $match && !ref $match->[0])) {	397	} elsif (("ARRAY" eq ref $match && !ref $match->[0])) {
243	my ($type, @match) = @$match;	398	my ($type, @match) = @$match;
244	@match	399	@match
245	? push @{ $self->{rcv}{$match->[0]} }, [$cb, \@match]	400	? push @{ $self->{rcv}{$match->[0]} }, [$cb, \@match]
246	: push @{ $self->{rc0}{$match->[0]} }, [$cb];	401	: push @{ $self->{rc0}{$match->[0]} }, [$cb];
247	} else {	402	} else {
248	push @{ $self->{any} }, [$cb, $match];	403	push @{ $self->{any} }, [$cb, $match];
		404	}
249	}	405	}
250	}	406	}
251		407
252	=item $port->register ($name)	408	=item $closure = psub { BLOCK }
253		409
254	Registers the given port under the well known name C<$name>. If the name	410	Remembers C<$SELF> and creates a closure out of the BLOCK. When the
255	already exists it is replaced.	411	closure is executed, sets up the environment in the same way as in C<rcv>
		412	callbacks, i.e. runtime errors will cause the port to get C<kil>ed.
256		413
257	A port can only be registered under one well known name.	414	This is useful when you register callbacks from C<rcv> callbacks:
258		415
259	=cut	416	rcv delayed_reply => sub {
		417	my ($delay, @reply) = @_;
		418	my $timer = AE::timer $delay, 0, psub {
		419	snd @reply, $SELF;
		420	};
		421	};
260		422
261	sub register {
262	my ($self, $name) = @_;
263
264	$self->{wkname} = $name;
265	$AnyEvent::MP::Base::WKP{$name} = "$self";
266	}
267
268	=item $port->destroy
269
270	Explicitly destroy/remove/nuke/vaporise the port.
271
272	Ports are normally kept alive by there mere existance alone, and need to
273	be destroyed explicitly.
274
275	=cut	423	=cut
276		424
277	sub destroy {	425	sub psub(&) {
278	my ($self) = @_;	426	my $cb = shift;
279		427
280	delete $AnyEvent::MP::Base::WKP{ $self->{wkname} };	428	my $port = $SELF
		429	or Carp::croak "psub can only be called from within rcv or psub callbacks, not";
281		430
282	delete $AnyEvent::MP::Base::PORT{$_}	431	sub {
283	for @{ $self->{names} };	432	local $SELF = $port;
		433
		434	if (wantarray) {
		435	my @res = eval { &$cb };
		436	_self_die if $@;
		437	@res
		438	} else {
		439	my $res = eval { &$cb };
		440	_self_die if $@;
		441	$res
		442	}
		443	}
284	}	444	}
285		445
286	=back	446	=back
287		447
288	=head1 FUNCTIONS FOR NODES	448	=head1 FUNCTIONS FOR NODES
289		449
290	=over 4	450	=over 4
291
292	=item mon $noderef, $callback->($noderef, $status, $)
293
294	Monitors the given noderef.
295		451
296	=item become_public endpoint...	452	=item become_public endpoint...
297		453
298	Tells the node to become a public node, i.e. reachable from other nodes.	454	Tells the node to become a public node, i.e. reachable from other nodes.
299		455
…		…
319		475
320	=over 4	476	=over 4
321		477
322	=cut	478	=cut
323		479
324	=item wkp => $name, @reply	480	=item lookup => $name, @reply
325		481
326	Replies with the port ID of the specified well-known port, or C<undef>.	482	Replies with the port ID of the specified well-known port, or C<undef>.
327		483
328	=item devnull => ...	484	=item devnull => ...
329		485

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Comparing AnyEvent-MP/MP.pm (file contents): Revision 1.16 by root, Sun Aug 2 19:29:41 2009 UTC vs. Revision 1.24 by root, Tue Aug 4 20:00:00 2009 UTC

Diff Legend

Comparing AnyEvent-MP/MP.pm (file contents):
Revision 1.16 by root, Sun Aug 2 19:29:41 2009 UTC vs.
Revision 1.24 by root, Tue Aug 4 20:00:00 2009 UTC