| 1 | <?php  | 
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| 5 | abstract class CallbackEvent  | 
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| 6 | { | 
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| 7 | private $senderId;  | 
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| 8 | private $recipientId;  | 
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| 9 | |||
| 10 | public function __construct($senderId, $recipientId)  | 
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| 15 | |||
| 16 | /**  | 
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| 17 | * Sender Id. Generally the User Id  | 
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| 18 | *  | 
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| 19 | * @return string  | 
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| 20 | */  | 
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| 21 | public function getSenderId()  | 
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| 25 | |||
| 26 | /**  | 
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| 27 | * Recipient Id. Generally the Page Id  | 
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| 28 | *  | 
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| 29 | * @return string  | 
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| 30 | */  | 
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| 31 | public function getRecipientId()  | 
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| 35 | |||
| 36 | /**  | 
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| 37 | * @return string  | 
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| 38 | */  | 
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| 39 | abstract public function getType();  | 
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| 40 | }  | 
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| 41 |