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PhutilEventListener.php
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Created
Sun, Aug 25, 17:26
Size
1 KB
Mime Type
text/x-php
Expires
Tue, Aug 27, 17:26 (2 d)
Engine
blob
Format
Raw Data
Handle
20172386
Attached To
rPHU libphutil
PhutilEventListener.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @group event
* @stable
*/
abstract
class
PhutilEventListener
{
private
$listenerID
;
private
static
$nextListenerID
=
1
;
final
public
function
__construct
()
{
// <empty>
}
abstract
public
function
register
();
abstract
public
function
handleEvent
(
PhutilEvent
$event
);
final
public
function
listen
(
$type
)
{
$engine
=
PhutilEventEngine
::
getInstance
();
$engine
->
addListener
(
$this
,
$type
);
}
/**
* Return a scalar ID unique to this listener. This is used to deduplicate
* listeners which match events on multiple rules, so they are invoked only
* once.
*
* @return int A scalar unique to this object instance.
*/
final
public
function
getListenerID
()
{
if
(!
$this
->
listenerID
)
{
$this
->
listenerID
=
self
::
$nextListenerID
;
self
::
$nextListenerID
++;
}
return
$this
->
listenerID
;
}
}
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