How to implement Plugin concept in magento2

Question

I want to implement plugin after, before and around concept in my Magento 2 website.

di.xml :

<type name="Magento\Webapi\Model\Soap\Server">
    <plugin name="soap_log" type="training\learning\Model\Webapi\Soap\Server" />
</type>

Magento\Webapi\Model\Soap\Server has a method _checkRequest and it has a string type parameter.

Now i want to get that string type parameter in my _aftercheckrRequest in training\learning\Model\Webapi\Soap\Server class. How can I achieve this ?

Answer 1

You can use plugin only for public methods. See docs

Answer 2

_aftercheckrRequest method is protected and we cannot use plugin. We can use Plugins only for public and non-static methods. For example we have one public function :public function test(); and plugin:

public function afterTest(\Magento\Webapi\Model\Soap\Server $subject, $result)
{
    // your code
    return $result;
}

Note: test() became afterTest() (capital "T")