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venv/Lib/site-packages/django/contrib/sessions/base_session.py

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+"""
+This module allows importing AbstractBaseSession even
+when django.contrib.sessions is not in INSTALLED_APPS.
+"""
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+
+class BaseSessionManager(models.Manager):
+    def encode(self, session_dict):
+        """
+        Return the given session dictionary serialized and encoded as a string.
+        """
+        session_store_class = self.model.get_session_store_class()
+        return session_store_class().encode(session_dict)
+
+    def save(self, session_key, session_dict, expire_date):
+        s = self.model(session_key, self.encode(session_dict), expire_date)
+        if session_dict:
+            s.save()
+        else:
+            s.delete()  # Clear sessions with no data.
+        return s
+
+
+class AbstractBaseSession(models.Model):
+    session_key = models.CharField(_('session key'), max_length=40, primary_key=True)
+    session_data = models.TextField(_('session data'))
+    expire_date = models.DateTimeField(_('expire date'), db_index=True)
+
+    objects = BaseSessionManager()
+
+    class Meta:
+        abstract = True
+        verbose_name = _('session')
+        verbose_name_plural = _('sessions')
+
+    def __str__(self):
+        return self.session_key
+
+    @classmethod
+    def get_session_store_class(cls):
+        raise NotImplementedError
+
+    def get_decoded(self):
+        session_store_class = self.get_session_store_class()
+        return session_store_class().decode(self.session_data)