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#!/usr/bin/python
# -*- coding: utf-8 -*-
"""Tests for the resolver objects cache."""
import unittest
from dfvfs.lib import errors
from dfvfs.path import fake_path_spec
from dfvfs.resolver import cache
class TestVFSObject(object):
"""Class to define the test VFS object."""
class ObjectsCacheValueTest(unittest.TestCase):
"""Tests for the resolver objects cache value."""
def testReferenceCount(self):
"""Tests the reference count functionality."""
vfs_object = TestVFSObject()
cache_value = cache.ObjectsCacheValue(vfs_object)
self.assertIsNotNone(cache_value)
# pylint: disable=protected-access
self.assertEqual(cache_value._reference_count, 0)
self.assertTrue(cache_value.IsDereferenced())
cache_value.IncrementReferenceCount()
self.assertEqual(cache_value._reference_count, 1)
self.assertFalse(cache_value.IsDereferenced())
cache_value.IncrementReferenceCount()
self.assertEqual(cache_value._reference_count, 2)
cache_value.DecrementReferenceCount()
self.assertEqual(cache_value._reference_count, 1)
cache_value.DecrementReferenceCount()
self.assertEqual(cache_value._reference_count, 0)
self.assertTrue(cache_value.IsDereferenced())
with self.assertRaises(RuntimeError):
cache_value.DecrementReferenceCount()
class ObjectsCacheTest(unittest.TestCase):
"""Tests for the resolver objects cache."""
def setUp(self):
"""Sets up the needed objects used throughout the test."""
self._path_spec = fake_path_spec.FakePathSpec(location=u'1')
self._vfs_object = TestVFSObject()
def testCache(self):
"""Tests the cache functionality."""
cache_object = cache.ObjectsCache(1)
self.assertIsNotNone(cache_object)
# pylint: disable=protected-access
self.assertEqual(len(cache_object._values), 0)
cache_object.CacheObject(self._path_spec.comparable, self._vfs_object)
self.assertEqual(len(cache_object._values), 1)
with self.assertRaises(KeyError):
cache_object.CacheObject(self._path_spec.comparable, self._vfs_object)
self.assertEqual(len(cache_object._values), 1)
cache_object.RemoveObject(self._path_spec.comparable)
self.assertEqual(len(cache_object._values), 0)
def testCacheFull(self):
"""Tests if the CacheFullError is raised."""
cache_object = cache.ObjectsCache(1)
self.assertIsNotNone(cache_object)
cache_object.CacheObject(self._path_spec.comparable, self._vfs_object)
path_spec = fake_path_spec.FakePathSpec(location=u'2')
vfs_object = TestVFSObject()
with self.assertRaises(errors.CacheFullError):
cache_object.CacheObject(path_spec.comparable, vfs_object)
def testEmpty(self):
"""Tests the Empty method."""
cache_object = cache.ObjectsCache(5)
self.assertIsNotNone(cache_object)
cache_object.CacheObject(self._path_spec.comparable, self._vfs_object)
path_spec = fake_path_spec.FakePathSpec(location=u'2')
vfs_object = TestVFSObject()
cache_object.CacheObject(path_spec.comparable, vfs_object)
path_spec = fake_path_spec.FakePathSpec(location=u'3')
vfs_object = TestVFSObject()
cache_object.CacheObject(path_spec.comparable, vfs_object)
# pylint: disable=protected-access
self.assertEqual(len(cache_object._values), 3)
cache_object.Empty()
self.assertEqual(len(cache_object._values), 0)
def testGetObject(self):
"""Tests the GetObject method."""
cache_object = cache.ObjectsCache(1)
self.assertIsNotNone(cache_object)
cache_object.CacheObject(self._path_spec.comparable, self._vfs_object)
cached_object = cache_object.GetObject(self._path_spec.comparable)
self.assertEqual(cached_object, self._vfs_object)
def testGetCacheValueByObjectGetCacheValueByObject(self):
"""Tests the GetCacheValueByObject method."""
cache_object = cache.ObjectsCache(1)
self.assertIsNotNone(cache_object)
cache_object.CacheObject(self._path_spec.comparable, self._vfs_object)
identifier, cache_value = cache_object.GetCacheValueByObject(
self._vfs_object)
self.assertEqual(identifier, self._path_spec.comparable)
self.assertEqual(cache_value.vfs_object, self._vfs_object)
def testGrabAndRelease(self):
"""Tests the GrabObject and ReleaseObject methods."""
cache_object = cache.ObjectsCache(1)
self.assertIsNotNone(cache_object)
cache_object.CacheObject(self._path_spec.comparable, self._vfs_object)
_, cache_value = cache_object.GetCacheValueByObject(self._vfs_object)
# pylint: disable=protected-access
self.assertEqual(cache_value._reference_count, 0)
cache_object.GrabObject(self._path_spec.comparable)
_, cache_value = cache_object.GetCacheValueByObject(self._vfs_object)
self.assertEqual(cache_value._reference_count, 1)
cache_object.GrabObject(self._path_spec.comparable)
_, cache_value = cache_object.GetCacheValueByObject(self._vfs_object)
self.assertEqual(cache_value._reference_count, 2)
cache_object.ReleaseObject(self._path_spec.comparable)
_, cache_value = cache_object.GetCacheValueByObject(self._vfs_object)
self.assertEqual(cache_value._reference_count, 1)
cache_object.ReleaseObject(self._path_spec.comparable)
_, cache_value = cache_object.GetCacheValueByObject(self._vfs_object)
self.assertEqual(cache_value._reference_count, 0)
if __name__ == '__main__':
unittest.main()
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