#!/usr/bin/env python
#
# Public Domain 2014-present MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
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# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
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# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
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# test_config09.py
#   Test the configuration that enables/disables dirty table flushing.
#

import wiredtiger, wttest
from wiredtiger import stat

class test_config09(wttest.WiredTigerTestCase):
    ntables = 50
    nentries = 5
    uri = 'table:config09.'
    conn_config = 'hash=(buckets=256,dhandle_buckets=1024),statistics=(fast)'

    # Create, populate and checkpoint the initial tables.
    def create_tables(self):
        for i in range(self.ntables):
            uri = self.uri + str(i)
            self.session.create(uri, 'key_format=i,value_format=i')
            c = self.session.open_cursor(uri)
            for j in range(self.nentries):
                c[j] = j
            c.close()
        self.session.checkpoint()

    # Update half the tables.
    def update_tables(self):
        for i in range(self.ntables//2):
            uri = self.uri + str(i)
            c = self.session.open_cursor(uri)
            for j in range(self.nentries):
                c[j] = j + 100
            c.close()
        self.session.checkpoint()

    # Verify statistics.
    def get_stat(self, stat):
        stat_cursor = self.session.open_cursor('statistics:', None, None)
        val = stat_cursor[stat][2]
        stat_cursor.close()
        return val

    def test_config09_invalid(self):
        self.conn.close()

        # Verify the message when using non-power-of-two values.
        msg = '/power of 2/'
        config = 'hash=(buckets=255,dhandle_buckets=1024)'
        self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
            lambda: self.wiredtiger_open('.', config), msg)
        config = 'hash=(buckets=256,dhandle_buckets=1000)'
        self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
            lambda: self.wiredtiger_open('.', config), msg)
        config = 'hash=(dhandle_buckets=1000)'
        self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
            lambda: self.wiredtiger_open('.', config), msg)

    def test_config09(self):
        self.create_tables()

        val = self.get_stat(stat.conn.buckets)
        self.assertEqual(val, 256)
        val = self.get_stat(stat.conn.buckets_dh)
        self.assertEqual(val, 1024)

        self.update_tables()
        val = self.get_stat(stat.conn.txn_checkpoint_handle_applied)
        # We cannot assert it is equal to half because there could be other
        # internal tables in the count. Assert it is less than 75% and at least
        # half.
        self.assertGreaterEqual(val, self.ntables // 2)
        self.assertLess(val, self.ntables // 4 * 3)
        val = self.get_stat(stat.conn.txn_checkpoint_handle_skipped)
        self.assertNotEqual(val, 0)

        self.conn.close()

if __name__ == '__main__':
    wttest.run()