1
|
|
|
<?php |
2
|
|
|
|
3
|
|
|
namespace PEIP\ABS\Handler; |
4
|
|
|
|
5
|
|
|
/* |
6
|
|
|
* This file is part of the PEIP package. |
7
|
|
|
* (c) 2009-2016 Timo Michna <timomichna/yahoo.de> |
8
|
|
|
* |
9
|
|
|
* For the full copyright and license information, please view the LICENSE |
10
|
|
|
* file that was distributed with this source code. |
11
|
|
|
*/ |
12
|
|
|
|
13
|
|
|
/* |
14
|
|
|
* PEIP\ABS\Handler\ReplyProducingMessageHandler |
15
|
|
|
* Base class for all message handlers that can reply to a message |
16
|
|
|
* on an output-channel. |
17
|
|
|
* |
18
|
|
|
* @author Timo Michna <timomichna/yahoo.de> |
19
|
|
|
* @package PEIP |
20
|
|
|
* @subpackage handler |
21
|
|
|
* @extends \PEIP\ABS\Handler\MessageHandler |
22
|
|
|
* @implements \PEIP\INF\Handler\Handler, \PEIP\INF\Message\MessageBuilder |
23
|
|
|
*/ |
24
|
|
|
|
25
|
|
|
use PEIP\Message\MessageBuilder; |
26
|
|
|
|
27
|
|
|
abstract class ReplyProducingMessageHandler extends \PEIP\ABS\Handler\MessageHandler |
28
|
|
|
{ |
29
|
|
|
protected $outputChannel, |
30
|
|
|
$messageClass = '\PEIP\Message\GenericMessage', |
31
|
|
|
$replyChannelHeaders = ['REPLY_CHANNEL']; |
32
|
|
|
|
33
|
|
|
/** |
34
|
|
|
* Sets the output-channel for the message handler. |
35
|
|
|
* Delegates connecting of input-channel to protected method 'doSetOutputChannel', |
36
|
|
|
* which can be overwritten by extending classes. |
37
|
|
|
* |
38
|
|
|
* @see \PEIP\ABS\Handler\MessageHandler::doSetOutputChannel |
39
|
|
|
* |
40
|
|
|
* @param \PEIP\INF\Channel\Channel $outputChannel the output-channel |
41
|
|
|
* |
42
|
|
|
* @return \PEIP\ABS\Handler\MessageHandler $this; |
43
|
|
|
*/ |
44
|
|
|
public function setOutputChannel(\PEIP\INF\Channel\Channel $outputChannel) |
45
|
|
|
{ |
46
|
|
|
$this->doSetOutputChannel($outputChannel); |
47
|
|
|
|
48
|
|
|
return $this; |
49
|
|
|
} |
50
|
|
|
|
51
|
|
|
/** |
52
|
|
|
* Connects the handler to the output-channel. |
53
|
|
|
* |
54
|
|
|
* @param \PEIP\INF\Channel\Channel $outputChannel the output-channel to connect the handler to |
55
|
|
|
* |
56
|
|
|
* @return |
57
|
|
|
*/ |
58
|
|
|
protected function doSetOutputChannel(\PEIP\INF\Channel\Channel $outputChannel) |
59
|
|
|
{ |
60
|
|
|
$this->outputChannel = $outputChannel; |
61
|
|
|
} |
62
|
|
|
|
63
|
|
|
/** |
64
|
|
|
* Returns the output-channel for this handler. |
65
|
|
|
* |
66
|
|
|
* @return \PEIP\INF\Channel\Channel output-channel for this handler |
67
|
|
|
*/ |
68
|
|
|
public function getOutputChannel() |
69
|
|
|
{ |
70
|
|
|
return $this->outputChannel; |
71
|
|
|
} |
72
|
|
|
|
73
|
|
|
/** |
74
|
|
|
* Resolves the output-channel for a message. |
75
|
|
|
* Returns default output-channel if no reply-channel is found in |
76
|
|
|
* the message headers. |
77
|
|
|
* |
78
|
|
|
* @see PEIP\ABS\Handler\ReplyProducingMessageHandler::resolveReplyChannel |
79
|
|
|
* |
80
|
|
|
* @param \PEIP\INF\Message\Message $message the message to resolve output-channel for |
81
|
|
|
* |
82
|
|
|
* @return \PEIP\INF\Channel\Channel the output-channel for the message |
83
|
|
|
*/ |
84
|
|
|
protected function doGetOutputChannel(\PEIP\INF\Message\Message $message) |
85
|
|
|
{ |
86
|
|
|
$replyChannel = $this->resolveReplyChannel($message); |
87
|
|
|
|
88
|
|
|
return $replyChannel ? $replyChannel : $this->getOutputChannel(); |
89
|
|
|
} |
90
|
|
|
|
91
|
|
|
/** |
92
|
|
|
* Resolves a reply-channel for a message. |
93
|
|
|
* Looks for a reply-channel header in the message (default: 'REPLY_CHANNEL') |
94
|
|
|
* and returns it�s value, if found. |
95
|
|
|
* |
96
|
|
|
* @param \PEIP\INF\Message\Message $message |
97
|
|
|
* |
98
|
|
|
* @return \PEIP\INF\Channel\Channel the reply-channel if found |
99
|
|
|
*/ |
100
|
|
|
protected function resolveReplyChannel(\PEIP\INF\Message\Message $message) |
101
|
|
|
{ |
102
|
|
|
foreach ($this->replyChannelHeaders as $header) { |
103
|
|
|
if ($message->hasHeader($header)) { |
104
|
|
|
return $message->getHeader($header); |
105
|
|
|
} |
106
|
|
|
} |
107
|
|
|
} |
108
|
|
|
|
109
|
|
|
/** |
110
|
|
|
* Sends a reply-message on a appropriate channel. |
111
|
|
|
* Argument $content can be either a message (\PEIP\INF\Message\Message) or |
112
|
|
|
* the content/payload to create a new message for. |
113
|
|
|
* |
114
|
|
|
* @see PEIP\ABS\Handler\ReplyProducingMessageHandler::ensureMessage |
115
|
|
|
* @see PEIP\ABS\Handler\ReplyProducingMessageHandler::doGetOutputChannel |
116
|
|
|
* |
117
|
|
|
* @param mixed $content \PEIP\INF\Message\Message or content/payload for new message |
118
|
|
|
*/ |
119
|
|
|
protected function replyMessage($content) |
120
|
|
|
{ |
121
|
|
|
$message = $this->ensureMessage($content); |
122
|
|
|
$this->doGetOutputChannel($message)->send($message); |
123
|
|
|
} |
124
|
|
|
|
125
|
|
|
/** |
126
|
|
|
* Ensures to return a valid \PEIP\INF\Message\Message instance. |
127
|
|
|
* If argument $message is not instance of \PEIP\INF\Message\Message, creates |
128
|
|
|
* a new message with $message as content/payload. |
129
|
|
|
* |
130
|
|
|
* @param mixed $message \PEIP\INF\Message\Message or content/payload for new message |
131
|
|
|
* |
132
|
|
|
* @return \PEIP\INF\Message\Message |
133
|
|
|
*/ |
134
|
|
|
protected function ensureMessage($message) |
135
|
|
|
{ |
136
|
|
|
return ($message instanceof \PEIP\INF\Message\Message) ? $message : $this->buildMessage($message); |
137
|
|
|
} |
138
|
|
|
|
139
|
|
|
/** |
140
|
|
|
* Creates a new message instance with given content as content/payload. |
141
|
|
|
* Delegates creation of message to instance of MessageBuilder. |
142
|
|
|
* |
143
|
|
|
* @param mixed $content content/payload for the message |
144
|
|
|
* |
145
|
|
|
* @return \PEIP\INF\Message\Message |
146
|
|
|
* |
147
|
|
|
* @see MessageBuilder |
148
|
|
|
*/ |
149
|
|
|
protected function buildMessage($content) |
150
|
|
|
{ |
151
|
|
|
return $this->getMessageBuilder()->setContent($content)->build(); |
152
|
|
|
} |
153
|
|
|
|
154
|
|
|
/** |
155
|
|
|
* Returns the a instance of MessageBuilder for the registered message class |
156
|
|
|
* to create reply-messages from. |
157
|
|
|
* |
158
|
|
|
* @return MessageBuilder builder for the registered message class |
159
|
|
|
*/ |
160
|
|
|
protected function getMessageBuilder() |
161
|
|
|
{ |
162
|
|
|
return isset($this->messageBuilder) && ($this->messageBuilder->getMessageClass() == $this->getMessageClass()) |
|
|
|
|
163
|
|
|
? $this->messageBuilder |
164
|
|
|
: $this->messageBuilder = MessageBuilder::getInstance($this->messageClass); |
165
|
|
|
} |
166
|
|
|
|
167
|
|
|
/** |
168
|
|
|
* Sets the message-class to create reply-messages from. |
169
|
|
|
* |
170
|
|
|
* @param string $messageClass name of the message-class to create reply-messages from. |
171
|
|
|
* |
172
|
|
|
* @return ReplyProducingMessageHandler $this |
173
|
|
|
*/ |
174
|
|
|
public function setMessageClass($messageClass) |
175
|
|
|
{ |
176
|
|
|
$this->messageClass = $messageClass; |
177
|
|
|
|
178
|
|
|
return $this; |
179
|
|
|
} |
180
|
|
|
|
181
|
|
|
/** |
182
|
|
|
* Returns the message-class to create reply-messages from. |
183
|
|
|
* |
184
|
|
|
* @return string name of the message-class to create reply-messages from. |
185
|
|
|
*/ |
186
|
|
|
public function getMessageClass() |
187
|
|
|
{ |
188
|
|
|
return $this->messageClass; |
189
|
|
|
} |
190
|
|
|
|
191
|
|
|
/** |
192
|
|
|
* Adds the name of a message-header to look for a reply-channel. |
193
|
|
|
* |
194
|
|
|
* @param string $headerName name of a message-header to look for a reply-channel |
195
|
|
|
* |
196
|
|
|
* @return void |
197
|
|
|
*/ |
198
|
|
|
public function addReplyChannelHeader($headerName) |
199
|
|
|
{ |
200
|
|
|
$this->replyChannelHeaders[] = $headerName; |
201
|
|
|
} |
202
|
|
|
|
203
|
|
|
/** |
204
|
|
|
* Sets all message-header names to look for a reply-channel. |
205
|
|
|
* |
206
|
|
|
* @param array $headerNames array of message-header names to look for a reply-channel |
207
|
|
|
* |
208
|
|
|
* @return ReplyProducingMessageHandler $this |
209
|
|
|
*/ |
210
|
|
|
public function setReplyChannelHeaders(array $headerNames) |
211
|
|
|
{ |
212
|
|
|
$this->replyChannelHeaders = $headerNames; |
213
|
|
|
|
214
|
|
|
return $this; |
215
|
|
|
} |
216
|
|
|
|
217
|
|
|
/** |
218
|
|
|
* Returns all message-header names to look for a reply-channel. |
219
|
|
|
* |
220
|
|
|
* @return array array of message-header names to look for a reply-channel |
221
|
|
|
*/ |
222
|
|
|
public function getReplyChannelHeaders() |
223
|
|
|
{ |
224
|
|
|
return $this->replyChannelHeaders; |
225
|
|
|
} |
226
|
|
|
|
227
|
|
|
/** |
228
|
|
|
* Does the message handling logic for the handler. |
229
|
|
|
* Implements abstract method of \PEIP\ABS\Handler\MessageHandler. |
230
|
|
|
* Delegates the handling of the message to abstract 'doReply' |
231
|
|
|
* method which must be implemented by extending classes. |
232
|
|
|
* |
233
|
|
|
* @param \PEIP\INF\Message\Message $message |
234
|
|
|
* |
235
|
|
|
* @return |
236
|
|
|
*/ |
237
|
|
|
protected function doHandle(\PEIP\INF\Message\Message $message) |
238
|
|
|
{ |
239
|
|
|
return $this->doReply($message); |
240
|
|
|
} |
241
|
|
|
|
242
|
|
|
/** |
243
|
|
|
* Does the message replying logic for the handler. |
244
|
|
|
* Must be implemented by extending classes. |
245
|
|
|
* |
246
|
|
|
* @abstract |
247
|
|
|
* |
248
|
|
|
* @param \PEIP\INF\Message\Message $message the message to reply with |
249
|
|
|
*/ |
250
|
|
|
abstract protected function doReply(\PEIP\INF\Message\Message $message); |
251
|
|
|
} |
252
|
|
|
|
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: