Net::D...eactor(3pm) User Contributed Perl Documentation Net::D...eactor(3pm)
NAME
Net::DBus::Reactor - application event loop
SYNOPSIS
Create and run an event loop:
use Net::DBus::Reactor;
my $reactor = Net::DBus::Reactor->main();
$reactor->run();
Manage some file handlers
$reactor->add_read($fd,
Net::DBus::Callback->new(method => sub {
my $fd = shift;
...read some data...
}, args => [$fd]));
$reactor->add_write($fd,
Net::DBus::Callback->new(method => sub {
my $fd = shift;
...write some data...
}, args => [$fd]));
Temporarily (dis|en)able a handle
# Disable
$reactor->toggle_read($fd, 0);
# Enable
$reactor->toggle_read($fd, 1);
Permanently remove a handle
$reactor->remove_read($fd);
Manage a regular timeout every 100 milliseconds
my $timer = $reactor->add_timeout(100,
Net::DBus::Callback->new(
method => sub {
...process the alarm...
}));
Temporarily (dis|en)able a timer
# Disable
$reactor->toggle_timeout($timer, 0);
# Enable
$reactor->toggle_timeout($timer, 1);
Permanently remove a timer
$reactor->remove_timeout($timer);
Add a post-dispatch hook
my $hook = $reactor->add_hook(Net::DBus::Callback->new(
method => sub {
... do some work...
}));
Remove a hook
$reactor->remove_hook($hook);
DESCRIPTION
This class provides a general purpose event loop for the purposes of
multiplexing I/O events and timeouts in a single process. The underlying
implementation is done using the select system call. File handles can be
registered for monitoring on read, write and exception (out-of-band
data) events. Timers can be registered to expire with a periodic
frequency. These are implemented using the timeout parameter of the
select system call. Since this parameter merely represents an upper
bound on the amount of time the select system call is allowed to sleep,
the actual period of the timers may vary. Under normal load this
variance is typically 10 milliseconds. Finally, hooks may be registered
which will be invoked on each iteration of the event loop (ie after
processing the file events, or timeouts indicated by the select system
call returning).
METHODS
my $reactor = Net::DBus::Reactor->new();
Creates a new event loop ready for monitoring file handles, or
generating timeouts. Except in very unusual circumstances (examples
of which I can't think up) it is not necessary or desriable to
explicitly create new reactor instances. Instead call the main
method to get a handle to the singleton instance.
$reactor = Net::DBus::Reactor->main;
Return a handle to the singleton instance of the reactor. This is
the recommended way of getting hold of a reactor, since it removes
the need for modules to pass around handles to their privately
created reactors.
$reactor->manage($connection);
$reactor->manage($server);
Registers a "Net::DBus::Binding::Connection" or
"Net::DBus::Binding::Server" object for management by the event
loop. This basically involves hooking up the watch & timeout
callbacks to the event loop. For connections it will also register
a hook to invoke the "dispatch" method periodically.
$reactor->run();
Starts the event loop monitoring any registered file handles and
timeouts. At least one file handle, or timer must have been
registered prior to running the reactor, otherwise it will
immediately exit. The reactor will run until all registered file
handles, or timeouts have been removed, or disabled. The reactor can
be explicitly stopped by calling the "shutdown" method.
$reactor->shutdown();
Explicitly shutdown the reactor after pending events have been
processed.
$reactor->step();
Perform one iteration of the event loop, going to sleep until an
event occurs on a registered file handle, or a timeout occurrs. This
method is generally not required in day-to-day use.
$reactor->add_read($fd, $callback[, $status]);
Registers a file handle for monitoring of read events. The $callback
parameter specifies either a code reference to a subroutine, or an
instance of the "Net::DBus::Callback" object to invoke each time an
event occurs. The optional $status parameter is a boolean value to
specify whether the watch is initially enabled.
$reactor->add_write($fd, $callback[, $status]);
Registers a file handle for monitoring of write events. The
$callback parameter specifies either a code reference to a
subroutine, or an instance of the "Net::DBus::Callback" object to
invoke each time an event occurs. The optional $status parameter is
a boolean value to specify whether the watch is initially enabled.
$reactor->add_exception($fd, $callback[, $status]);
Registers a file handle for monitoring of exception events. The
$callback parameter specifies either a code reference to a
subroutine, or an instance of the "Net::DBus::Callback" object to
invoke each time an event occurs. The optional $status parameter is
a boolean value to specify whether the watch is initially enabled.
my $id = $reactor->add_timeout($interval, $callback, $status);
Registers a new timeout to expire every $interval milliseconds. The
$callback parameter specifies either a code reference to a
subroutine, or an instance of the "Net::DBus::Callback" object to
invoke each time the timeout expires. The optional $status parameter
is a boolean value to specify whether the timeout is initially
enabled. The return parameter is a unique identifier which can be
used to later remove or disable the timeout.
$reactor->remove_timeout($id);
Removes a previously registered timeout specified by the $id
parameter.
$reactor->toggle_timeout($id, $status[, $interval]);
Updates the state of a previously registered timeout specified by
the $id parameter. The $status parameter specifies whether the
timeout is to be enabled or disabled, while the optional $interval
parameter can be used to change the period of the timeout.
my $id = $reactor->add_hook($callback[, $status]);
Registers a new hook to be fired on each iteration of the event
loop. The $callback parameter specifies either a code reference to
a subroutine, or an instance of the "Net::DBus::Callback" class to
invoke. The $status parameter determines whether the hook is
initially enabled, or disabled. The return parameter is a unique id
which should be used to later remove, or disable the hook.
$reactor->remove_hook($id)
Removes the previously registered hook identified by $id.
$reactor->toggle_hook($id, $status)
Updates the status of the previously registered hook identified by
$id. The $status parameter determines whether the hook is to be
enabled or disabled.
$reactor->remove_read($fd);
$reactor->remove_write($fd);
$reactor->remove_exception($fd);
Removes a watch on the file handle $fd.
$reactor->toggle_read($fd, $status);
$reactor->toggle_write($fd, $status);
$reactor->toggle_exception($fd, $status);
Updates the status of a watch on the file handle $fd. The $status
parameter species whether the watch is to be enabled or disabled.
SEE ALSO
Net::DBus::Callback, Net::DBus::Connection, Net::DBus::Server
AUTHOR
Daniel Berrange <dan@berrange.com>
COPYRIGHT
Copyright 2004-2011 by Daniel Berrange
perl v5.40.0 2024-10-15 Net::D...eactor(3pm)
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