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| 3 | AE - simpler/faster/newer/cooler AnyEvent API |
3 | AE - simpler/faster/newer/cooler AnyEvent API |
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4 | |
| 5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
| 6 | |
6 | |
| 7 | See the L<AnyEvent> manpage for everything there is to say about AE. |
7 | use AnyEvent; # not AE |
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8 | |
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9 | # file handle or descriptor readable |
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10 | my $w = AE::io $fh, 0, sub { ... }; |
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11 | |
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12 | # one-shot or repeating timers |
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13 | my $w = AE::timer $seconds, 0, sub { ... }; # once |
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14 | my $w = AE::timer $seconds, $interval, sub { ... }; # repeated |
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15 | |
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16 | print AE::now; # prints current event loop time |
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17 | print AE::time; # think Time::HiRes::time or simply CORE::time. |
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18 | |
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19 | # POSIX signal |
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20 | my $w = AE::signal TERM => sub { ... }; |
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21 | |
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22 | # child process exit |
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23 | my $w = AE::child $pid, sub { |
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24 | my ($pid, $status) = @_; |
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25 | ... |
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26 | }; |
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27 | |
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28 | # called when event loop idle (if applicable) |
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29 | my $w = AE::idle sub { ... }; |
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30 | |
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31 | my $w = AE::cv; # stores whether a condition was flagged |
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32 | $w->send; # wake up current and all future recv's |
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33 | $w->recv; # enters "main loop" till $condvar gets ->send |
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34 | # use a condvar in callback mode: |
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35 | $w->cb (sub { $_[0]->recv }); |
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36 | |
| 8 | |
37 | |
| 9 | =head1 DESCRIPTION |
38 | =head1 DESCRIPTION |
| 10 | |
39 | |
| 11 | This module implements the new simpler AnyEvent API. There is no |
40 | This module documents the new simpler AnyEvent API. |
| 12 | description of this API here, refer to the L<AnyEvent> module for this. |
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| 13 | |
41 | |
| 14 | The rationale for the new API is that experience with L<EV> shows that |
42 | The rationale for the new API is that experience with L<EV> shows that |
| 15 | this API actually "works", despite it's simplicity. This API is (will be) |
43 | this API actually "works", despite its lack of extensibility, leading to |
| 16 | much faster and also requires less typing. |
44 | a shorter, easier and faster API. |
| 17 | |
45 | |
| 18 | The "old" API is still supported, and there are no plans to "switch". |
46 | The main differences from AnyEvent is that function calls are used |
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47 | instead of method calls, and that no named arguments are used. |
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48 | |
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49 | This makes calls to watcher creation functions really short, which can |
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50 | make a program more readable despite the lack of named parameters. |
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51 | Function calls also allow more static type checking than method calls, so |
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52 | many mistakes are caught at compile-time with this API. |
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53 | |
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54 | Also, some backends (Perl and EV) are so fast that the method call |
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55 | overhead is very noticeable (with EV it increases the execution time five- |
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56 | to six-fold, with Perl the method call overhead is about a factor of two). |
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57 | |
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58 | At the moment, there is no checking (L<AnyEvent::Strict> does not |
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59 | affect this API), so the L<AnyEvent> API still has a definite advantage |
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60 | here. |
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61 | |
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62 | Note that the C<AE> API is an alternative to, not the future version of, |
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63 | the AnyEvent API. Both APIs can be used interchangeably and and there are |
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64 | no plans to "switch", so if in doubt, feel free to use the L<AnyEvent> |
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65 | API in new code. |
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66 | |
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67 | As the AE API is complementary, not everything in the AnyEvent API is |
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68 | available, and you still need to use AnyEvent for the finer stuff. Also, |
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69 | you should not C<use AE> directly, C<use AnyEvent> will provide the AE |
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70 | namespace. |
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71 | |
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72 | =head2 FUNCTIONS |
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73 | |
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74 | This section briefly describes the alternative watcher |
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75 | constructors. Semantics are not described here; please |
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76 | refer to the L<AnyEvent> manpage for the details. |
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77 | |
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78 | =over 4 |
| 19 | |
79 | |
| 20 | =cut |
80 | =cut |
| 21 | |
81 | |
| 22 | package AE; |
82 | package AE; |
| 23 | |
83 | |
| 24 | use AnyEvent (); # BEGIN { AnyEvent::common_sense } |
84 | use AnyEvent (); # BEGIN { AnyEvent::common_sense } |
| 25 | |
85 | |
| 26 | 1; |
86 | our $VERSION = $AnyEvent::VERSION; |
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87 | |
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88 | =item $w = AE::io $fh_or_fd, $watch_write, $cb |
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89 | |
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90 | Creates an I/O watcher that listens for read events (C<$watch_write> |
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91 | false) or write events (C<$watch_write> is true) on the file handle or |
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92 | file descriptor C<$fh_or_fd>. |
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93 | |
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94 | The callback C<$cb> is invoked as soon and as long as I/O of the type |
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95 | specified by C<$watch_write>) can be done on the file handle/descriptor. |
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96 | |
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97 | Example: wait until STDIN becomes readable. |
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98 | |
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99 | $stdin_ready = AE::io *STDIN, 0, sub { scalar <STDIN> }; |
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100 | |
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101 | Example: wait until STDOUT becomes writable and print something. |
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102 | |
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103 | $stdout_ready = AE::io *STDOUT, 1, sub { print STDOUT "woaw\n" }; |
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104 | |
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105 | =item $w = AE::timer $after, $interval, $cb |
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106 | |
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107 | Creates a timer watcher that invokes the callback C<$cb> after at least |
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108 | C<$after> second have passed (C<$after> can be negative or C<0>). |
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109 | |
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110 | If C<$interval> is C<0>, then the callback will only be invoked once, |
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111 | otherwise it must be a positive number of seconds that specifies the |
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112 | interval between successive invocations of the callback. |
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113 | |
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114 | Example: print "too late" after at least one second has passed. |
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115 | |
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116 | $timer_once = AE::timer 1, 0, sub { print "too late\n" }; |
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117 | |
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118 | Example: print "blubb" once a second, starting as soon as possible. |
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119 | |
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120 | $timer_repeated = AE::timer 0, 1, sub { print "blubb\n" }; |
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121 | |
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122 | =item $w = AE::signal $signame, $cb |
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123 | |
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124 | Invoke the callback C<$cb> each time one or more occurrences of the |
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125 | named signal C<$signame> are detected. |
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126 | |
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127 | =item $w = AE::child $pid, $cb |
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128 | |
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129 | Invokes the callback C<$cb> when the child with the given C<$pid> exits |
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130 | (or all children, when C<$pid> is zero). |
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131 | |
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132 | The callback will get the actual pid and exit status as arguments. |
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133 | |
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134 | =item $w = AE::idle $cb |
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135 | |
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136 | Invoke the callback C<$cb> each time the event loop is "idle" (has no |
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137 | events outstanding), but do not prevent the event loop from polling for |
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138 | more events. |
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139 | |
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140 | =item $cv = AE::cv |
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141 | |
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142 | =item $cv = AE::cv { BLOCK } |
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143 | |
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144 | Create a new condition variable. The first form is identical to C<< |
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145 | AnyEvent->condvar >>, the second form additionally sets the callback (as |
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146 | if the C<cb> method is called on the condition variable). |
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147 | |
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148 | =item AE::now |
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149 | |
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150 | Returns the current event loop time (may be cached by the event loop). |
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151 | |
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152 | =item AE::now_update |
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153 | |
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154 | Ensures that the current event loop time is up to date. |
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155 | |
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156 | =item AE::time |
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157 | |
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158 | Return the current time (not cached, always consults a hardware clock). |
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159 | |
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160 | =back |
| 27 | |
161 | |
| 28 | =head1 AUTHOR |
162 | =head1 AUTHOR |
| 29 | |
163 | |
| 30 | Marc Lehmann <schmorp@schmorp.de> |
164 | Marc Lehmann <schmorp@schmorp.de> |
| 31 | http://home.schmorp.de/ |
165 | http://home.schmorp.de/ |
| 32 | |
166 | |
| 33 | =cut |
167 | =cut |
| 34 | |
168 | |
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169 | 1 |
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170 | |
