From ae5823f486af88b8ad8d0dd3258d205a284e9833 Mon Sep 17 00:00:00 2001
From: pacien
Date: Thu, 5 Apr 2018 04:09:15 +0200
Subject: Add random paginator

---
 randomp.py | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 randomp.py

(limited to 'randomp.py')

diff --git a/randomp.py b/randomp.py
new file mode 100644
index 0000000..48e9abf
--- /dev/null
+++ b/randomp.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+
+# UPEM / Programmation système / Projet : Simulation de gestion de mémoire virtuelle
+# Pacien TRAN-GIRARD et Adam NAILI
+
+from random import randint
+from mem import Memory
+from pageexception import PageException
+
+
+class RandomPaginator:
+  def __init__(self, mem):
+    self.mem = mem
+    self._main_occupancy = 0
+
+  def _random_page(self):
+    if self._main_occupancy < len(self.mem.main):
+      return self._main_occupancy
+    else:
+      return randint(0, len(self.mem.main) - 1)
+
+  def _put_main(self, page):
+    index = self._random_page()
+    overwritten = self.mem.main[index]
+    self.mem.main[index] = page
+    self._main_occupancy += 1
+    return overwritten
+
+  def load(self, page):
+    if not self.mem.page_in_range(page): raise PageException
+    if page in self.mem.main: return
+    if page in self.mem.virt: self.mem.remove_virt(page)
+    overwritten = self._put_main(page)
+    if overwritten is not None: self.mem.put_virt(overwritten)
+
-- 
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