#!/usr/bin/env python
#
# Public Domain 2014-2018 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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import os, time
import wiredtiger, wttest
from wtdataset import SimpleDataSet, ComplexDataSet
from wtscenario import make_scenarios

# test_rebalance.py
#    session level rebalance operation
class test_rebalance(wttest.WiredTigerTestCase):
    name = 'test_rebalance'

    # Use small pages so we generate some internal layout
    # Setup LSM so multiple chunks are present
    config = 'allocation_size=512,internal_page_max=512' + \
             ',leaf_page_max=1k,lsm=(chunk_size=512k,merge_min=10)'

    scenarios = make_scenarios([
        ('file', dict(uri='file:')),
        ('table', dict(uri='table:')),
        ('lsm', dict(uri='lsm:'))
    ])

    # Populate an object, then rebalance it.
    def rebalance(self, dataset, with_cursor):
        uri = self.uri + self.name
        ds = dataset(self, uri, 10000, config=self.config)
        ds.populate()

        # Force to disk, we don't rebalance in-memory objects.
        self.reopen_conn()

        # Open cursors should cause failure.
        if with_cursor:
            cursor = self.session.open_cursor(uri, None, None)
            self.assertRaises(wiredtiger.WiredTigerError,
                lambda: self.session.rebalance(uri, None))
            cursor.close()

        self.session.rebalance(uri, None)
        self.session.drop(uri)

    # Test rebalance of an object.
    def test_rebalance(self):
        # Simple file or table object.
        self.rebalance(SimpleDataSet, False)
        self.rebalance(SimpleDataSet, True)

        # A complex, multi-file table object.
        if self.uri == "table:":
            self.rebalance(ComplexDataSet, False)
            self.rebalance(ComplexDataSet, True)

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