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Viewing changes to bzrlib/tests/test_btree_index.py

  • Committer: Martin Packman
  • Date: 2012-02-27 14:50:41 UTC
  • mfrom: (6437.23.17 2.5)
  • mto: This revision was merged to the branch mainline in revision 6477.
  • Revision ID: martin.packman@canonical.com-20120227145041-gc9wmhu97liqc9se
Merge 2.5 into bzr.dev

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bzrlib/tests/test_btree_index.py
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        self.overrideAttr(btree_index, '_PAGE_SIZE')
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        btree_index._PAGE_SIZE = 2048
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    def assertEqualsApproxCompressed(self, expected, actual, slop=6):
 
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        """Check a count of compressed bytes is approximately as expected
 
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        Relying on compressed length being stable even with fixed inputs is
 
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        slightly bogus, but zlib is stable enough that this mostly works.
 
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        """
 
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        if not expected - slop < actual < expected + slop:
 
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            self.fail("Expected around %d bytes compressed but got %d" %
 
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                (expected, actual))
 
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class TestBTreeBuilder(BTreeTestCase):
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        temp_file = builder.finish()
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        content = temp_file.read()
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        del temp_file
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        self.assertEqual(9283, len(content))
 
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        self.assertEqualsApproxCompressed(9283, len(content))
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        self.assertEqual(
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            "B+Tree Graph Index 2\nnode_ref_lists=0\nkey_elements=1\nlen=400\n"
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            "row_lengths=1,2\n",
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        temp_file = builder.finish()
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        content = temp_file.read()
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        del temp_file
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        self.assertEqual(155, len(content))
 
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        self.assertEqualsApproxCompressed(155, len(content))
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        self.assertEqual(
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            "B+Tree Graph Index 2\nnode_ref_lists=0\nkey_elements=1\nlen=10\n"
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            "row_lengths=1\n",
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        temp_file = builder.finish()
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        content = temp_file.read()
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        del temp_file
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        self.assertEqual(9283, len(content))
 
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        self.assertEqualsApproxCompressed(9283, len(content))
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        self.assertEqual(
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            "B+Tree Graph Index 2\nnode_ref_lists=0\nkey_elements=1\nlen=400\n"
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            "row_lengths=1,2\n",
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        temp_file = builder.finish()
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        content = temp_file.read()
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        del temp_file
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        self.assertEqual(12643, len(content))
 
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        self.assertEqualsApproxCompressed(12643, len(content))
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        self.assertEqual(
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            "B+Tree Graph Index 2\nnode_ref_lists=2\nkey_elements=2\nlen=200\n"
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            "row_lengths=1,3\n",
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        # The entire index should have been read, as it is one page long.
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        self.assertEqual([('readv', 'index', [(0, size)], False, None)],
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            t._activity)
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        self.assertEqual(1173, size)
 
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        self.assertEqualsApproxCompressed(1173, size)
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    def test_with_offset_no_size(self):
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        index = self.make_index_with_offset(key_elements=1, ref_lists=1,
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            builder.add_node(*node)
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        t = transport.get_transport_from_url('trace+' + self.get_url(''))
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        size = t.put_file('index', builder.finish())
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        self.assertEqual(17692, size)
 
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        self.assertEqualsApproxCompressed(17692, size)
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        index = btree_index.BTreeGraphIndex(t, 'index', size)
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        del t._activity[:]
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        self.assertEqual([], t._activity)
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        # The entire index should have been read linearly.
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        self.assertEqual([('readv', 'index', [(0, size)], False, None)],
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                         t._activity)
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        self.assertEqual(1488, size)
 
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        self.assertEqualsApproxCompressed(1488, size)
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    def test_validate_two_pages(self):
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        builder = btree_index.BTreeBuilder(key_elements=2, reference_lists=2)
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        t = transport.get_transport_from_url('trace+' + self.get_url(''))
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        size = t.put_file('index', builder.finish())
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        # Root page, 2 leaf pages
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        self.assertEqual(9339, size)
 
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        self.assertEqualsApproxCompressed(9339, size)
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        index = btree_index.BTreeGraphIndex(t, 'index', size)
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        del t._activity[:]
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        self.assertEqual([], t._activity)
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        index.validate()
 
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        rem = size - 8192 # Number of remaining bytes after second block
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        # The entire index should have been read linearly.
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        self.assertEqual(
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            [('readv', 'index', [(0, 4096)], False, None),
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             ('readv', 'index', [(4096, 4096), (8192, 1147)], False, None)],
 
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             ('readv', 'index', [(4096, 4096), (8192, rem)], False, None)],
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            t._activity)
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        # XXX: TODO: write some badly-ordered nodes, and some pointers-to-wrong
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        # node and make validate find them.
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            builder.add_node(*node)
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        t = transport.get_transport_from_url('trace+' + self.get_url(''))
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        size = t.put_file('index', builder.finish())
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        self.assertEqual(1303220, size, 'number of expected bytes in the'
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                                        ' output changed')
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        page_size = btree_index._PAGE_SIZE
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        del builder
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        index = btree_index.BTreeGraphIndex(t, 'index', size)
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        # The entire index should have been read
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        total_pages = sum(index._row_lengths)
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        self.assertEqual(total_pages, index._row_offsets[-1])
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        self.assertEqual(1303220, size)
 
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        self.assertEqualsApproxCompressed(1303220, size)
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        # The start of the leaves
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        first_byte = index._row_offsets[-2] * page_size
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        readv_request = []