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=head1 NAME |
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AnyEvent::AIO - truly asynchronous file and directory I/O |
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=head1 SYNOPSIS |
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use AnyEvent::DBus; |
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# now use the Net::DBus API, preferably the non-blocking variants |
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=head1 DESCRIPTION |
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This module is an L<AnyEvent> user, you need to make sure that you use and |
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run a supported event loop. |
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Loading this module will install the necessary magic to seamlessly |
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integrate L<Net::DBus> into L<AnyEvent>. It does this by quite brutally |
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hacking L<Net::DBus::Reactor> so that all dbus connections created after |
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loading this module will automatically be managed by this module. |
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Note that a) a lot inside Net::DBus is still blocking b) if you call a |
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method that blocks, you again block your process (basically anything |
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but calls to the Net::DBus::Binding::Connection objects block, but |
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see Net::DBus::Annoation, specifically dbus_call_async) and c) this |
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module only implements the minimum API required to make Net::DBus work - |
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Net::DBus unfortunately has no nice hooking API. |
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However, unlike L<Net::DBus::Reactor>, this module should be fully |
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non-blocking as long as you only use non-blocking APIs (Net::DBus::Reactor |
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blocks on writes). It should also be faster, but Net::DBus is such a |
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morass os unneeded method calls that speed won't matter much... |
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=head2 EXAMPLE |
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Here is a simple example. Both work with AnyEvent::DBus and do the same |
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thing, but only the second is actually non-blocking. |
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Example 1: list registered named, blocking version. |
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use AnyEvent::DBus; |
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my $conn = Net::DBus->find; |
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my $bus = $conn->get_bus_object; |
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for my $name (@{ $bus->ListNames }) { |
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print " $name\n"; |
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} |
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Example 1: list registered named, somewhat non-blocking version. |
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use AnyEvent; |
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use AnyEvent::DBus; |
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use Net::DBus::Annotation qw(:call); |
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my $conn = Net::DBus->find; # always blocks :/ |
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my $bus = $conn->get_bus_object; |
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my $quit = AE::cv; |
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# the trick here is to prepend dbus_call_async to any method |
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# arguments and then to call the set_notify method on the |
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# returned Net::DBus::AsyncReply object |
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$bus->ListNames (dbus_call_async)->set_notify (sub { |
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for my $name (@{ $_[0]->get_result }) { |
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print " $name\n"; |
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} |
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$quit->send; |
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}); |
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$quit->recv; |
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=cut |
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package AnyEvent::DBus; |
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use common::sense; |
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use AnyEvent (); |
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use Net::DBus (); |
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use Net::DBus::Binding::Watch (); |
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our $VERSION = '0.1'; |
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# yup, Net::DBus checks by using exists on %INC... |
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$INC{'Net/DBus/Reactor.pm'} = undef; |
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# claim we are the main reactor mainloop |
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*Net::DBus::Reactor::main = sub { __PACKAGE__ }; |
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our $I = 0; |
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our %O; # watchers and timers, unfortunately, dbus only supports attaching integers... |
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sub watch_off { |
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delete $O{$_[1]->get_data}; |
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} |
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sub io_toggle { |
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my ($con, $w) = @_; |
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my $id = $w->get_data; |
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my $f = $w->get_flags; |
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my $fd = $w->get_fileno; |
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my $on = $w->is_enabled; |
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$f & Net::DBus::Binding::Watch::READABLE () |
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and |
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$O{$id}[0] = $on && AE::io $fd, 0, sub { |
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$w->handle (Net::DBus::Binding::Watch::READABLE ()); |
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$con->dispatch; # wtf., we tell it data is ready, but have to call dispatch ourselves??? |
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}; |
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$f & Net::DBus::Binding::Watch::WRITABLE () |
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and |
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$O{$id}[1] = $on && AE::io $fd, 1, sub { |
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$w->handle (Net::DBus::Binding::Watch::WRITABLE ()); |
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# calling flush, as NEt::DBus::Reactor does, is blocking :/ |
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}; |
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} |
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sub io_on { |
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my ($con, $w) = @_; |
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my $id = ++$I; |
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$w->set_data ($id); |
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&io_toggle; |
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} |
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sub timeout_toggle { |
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my ($con, $w) = @_; |
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my $id = $w->get_data; |
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my $i = $w->get_interval * 0.001; |
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$O{$id} = $w->is_enabled && AE::timer $i, $i, sub { $w->handle }; |
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} |
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sub timeout_on { |
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my ($con, $w) = @_; |
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my $id = ++$I; |
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$w->set_data ($id); |
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&timeout_toggle; |
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} |
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sub manage { |
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my (undef, $con) = @_; |
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$con->set_watch_callbacks (\&io_on, \&watch_off, \&io_toggle); |
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# if $con->can ("set_watch_callbacks"); |
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$con->set_timeout_callbacks (\&timeout_on, \&watch_off, \&timeout_toggle); |
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# if $con->can ("set_timeout_callbacks"); |
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} |
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=head1 SEE ALSO |
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L<AnyEvent>, L<Net::DBus>. |
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=head1 AUTHOR |
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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=cut |
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1 |
