Created
January 12, 2018 12:05
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Command Handling Policy / Strategy Pattern in Application Services
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<?php | |
namespace Rewotec\TimeTracking\Application\Employee; | |
use Rewotec\TimeTracking\Domain\Model\Employee\AssignableJobFunctionPolicy; | |
use Rewotec\TimeTracking\Domain\Model\Employee\Employee; | |
use Rewotec\TimeTracking\Domain\Model\Employee\EmployeeRepository; | |
/** | |
* Class AssignEmployeeHandler | |
* @package Rewotec\TimeTracking\Application\Employee | |
* @author Michael Borchers <m.borchers@rewotec.com> | |
*/ | |
final class AssignEmployeeHandler | |
{ | |
/** @var AssignableJobFunctionPolicy $jobFunctionPolicy */ | |
private $jobFunctionPolicy; | |
/** @var EmployeeRepository $employees */ | |
private $employees; | |
/** | |
* AssignEmployeeHandler constructor. | |
* @param AssignableJobFunctionPolicy $jobFunctionPolicy | |
* @param EmployeeRepository $employees | |
*/ | |
public function __construct(AssignableJobFunctionPolicy $jobFunctionPolicy, EmployeeRepository $employees) | |
{ | |
$this->jobFunctionPolicy = $jobFunctionPolicy; | |
$this->employees = $employees; | |
} | |
/** | |
* @param AssignEmployee $command | |
*/ | |
public function __invoke(AssignEmployee $command) | |
{ | |
if (!$this->jobFunctionPolicy->isSatisfiedBy($command->jobFunctionId())) { | |
// Employees whose job function is not linked to an activity are not assigned. | |
return; | |
} | |
$employee = Employee::assign( | |
$command->employeeId(), $command->personnelNumber(), $command->firstName(), $command->lastName(), | |
$command->companyId(), $command->startDate(), $command->leavingDate(), | |
$command->workerCategory(), $command->jobFunctionId() | |
); | |
$this->employees->add($employee); | |
} | |
} |
A Process Manager / Consumer receives all employees. It then creates the AssignEmployee
command.
Currently then the Command Handler gets injected a Policy that decides if the command holds the correct JobFunctionId
.
If not, the Command can be ignored. Otherwise the Aggregate Employee
can be created and stored inside the Repository.
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Where does the
AssignEmployee
command come from? And who is interested in the result?