--- /dev/null
+<?php
+
+namespace Drupal\{{ machine_name }}\Form;
+
+use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Logger\LoggerChannelFactoryInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a {{ name }} form.
+ */
+class {{ class }} extends FormBase {
+
+ /**
+ * The logger factory.
+ *
+ * @var \Drupal\Core\Logger\LoggerChannelFactoryInterface
+ */
+ protected $logger;
+
+ /**
+ * Constructs a {{ class }} object.
+ *
+ * @param \Drupal\Core\Logger\LoggerChannelFactoryInterface $logger_factory
+ * A logger instance.
+ */
+ public function __construct(LoggerChannelFactoryInterface $logger_factory) {
+ $this->loggerFactory = $logger_factory;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('logger.factory')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return '{{ form_id }}';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+
+ $form['message'] = [
+ '#type' => 'textarea',
+ '#title' => $this->t('Message'),
+ '#required' => TRUE,
+ ];
+
+ $form['actions'] = ['#type' => 'actions'];
+ $form['actions']['submit'] = [
+ '#type' => 'submit',
+ '#value' => $this->t('Save'),
+ ];
+
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validateForm(array &$form, FormStateInterface $form_state) {
+ if (Unicode::strlen($form_state->getValue('message')) < 10) {
+ $form_state->setErrorByName('name', $this->t('Message should be at least 10 characters.'));
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $this->loggerFactory->get('{{ machine_name }}')->debug(
+ $form_state->getValue('message')
+ );
+ drupal_set_message($this->t('The message has been sent.'));
+ $form_state->setRedirect('system.admin');
+ }
+
+}