php教程：php设计模式介绍之代理模式(3)

最后让我们看一个简单的实际例子来理解PHP5风格的SoapClient这个服务。假设有这样的一个例子,我们需要查看美国伊利诺斯州的moline的天气。这个获得当前moline飞机场天气状态的代码称为”KMLI”,需要调用getWeatherReport()方法和传递’KMLI’字符串作为参数。这个调用将返回一个WeatherReport对象。

class ProxyTestCase extends UnitTestCase {
function TestGetWeatherReport() {
$moline_weather = $this->client->getWeatherReport(‘KMLI’);
$this->assertIsA($moline_weather, ‘stdClass’);
}
}

因为WeatherReport实际上并不是你程序中定义的类, SoapClient都象stdClass的实例化一样的返回所有的对象。这时你也可以获得返回对象的属性的值。

class ProxyTestCase extends UnitTestCase {
function TestGetWeatherReport() {
$moline_weather = $this->client->getWeatherReport(‘KMLI’);
$this->assertIsA($moline_weather, ‘stdClass’);
$weather_tests = array(
‘timestamp’ => ‘String’
,’station’ => ‘stdClass’
,’phenomena’ => ‘Array’
,’precipitation’ => ‘Array’
,’extremes’ => ‘Array’
,’pressure’ => ‘stdClass’
,’sky’ => ‘stdClass’
,’temperature’ => ‘stdClass’
,’visibility’ => ‘stdClass’
,’wind’ => ‘stdClass’
);
foreach($weather_tests as $key => $isa) {
$this->assertIsA($moline_weather->$key,
$isa,
“$key should be $isa, actually [%s]”);
}
}
}

上面的代码创建了属性和返回类型的映射。你可以迭代这些预期值的列表,并使用assertIsA()验证正确的类型。当然你以可以同样的验证其他的集合对象。

class ProxyTestCase extends UnitTestCase {
function TestGetWeatherReport() {
// continued ...
$temp = $moline_weather->temperature;
$temperature_tests = array(
‘ambient’ => ‘Float’
,’dewpoint’ => ‘Float’
,’relative_humidity’ => ‘Integer’
,’string’ => ‘String’
);
foreach($temperature_tests as $key => $isa) {
$this->assertIsA($temp->$key,
$isa,
“$key should be $isa, actually [%s]”);
}
}
}

上面的方法输出的实际效果如下：

stdClass Object
(
[timestamp] => 2005-02-27T13:52:00Z
[station] => stdClass Object
(
[icao] => KMLI
[wmo] => 72544
[iata] =>
[elevation] => 179
[latitude] => 41.451
[longitude] => -90.515
[name] => Moline, Quad-City Airport
[region] => IL
[country] => United States
[string] => KMLI - Moline, Quad-City Airport, IL, United States @ 41.451’N -90.515’W 179m
)
// ...
[temperature] => stdClass Object
(
[ambient] => 0.6
[dewpoint] => -2.8
[relative_humidity] => 78
[string] => 0.6c (78% RH)
)
// ...
)