/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*
COPYING CONDITIONS NOTICE:

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation, and provided that the
  following conditions are met:

      * Redistributions of source code must retain this COPYING
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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COPYRIGHT NOTICE:

  TokuDB, Tokutek Fractal Tree Indexing Library.
  Copyright (C) 2007-2013 Tokutek, Inc.

DISCLAIMER:

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

UNIVERSITY PATENT NOTICE:

  The technology is licensed by the Massachusetts Institute of
  Technology, Rutgers State University of New Jersey, and the Research
  Foundation of State University of New York at Stony Brook under
  United States of America Serial No. 11/760379 and to the patents
  and/or patent applications resulting from it.

PATENT MARKING NOTICE:

  This software is covered by US Patent No. 8,185,551.

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  "THIS IMPLEMENTATION" means the copyrightable works distributed by
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  the absence of this license would be infringed by THIS
  IMPLEMENTATION or by using or running THIS IMPLEMENTATION.

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*/

#ident "Copyright (c) 2007-2013 Tokutek Inc.  All rights reserved."
#ident "The technology is licensed by the Massachusetts Institute of Technology, Rutgers State University of New Jersey, and the Research Foundation of State University of New York at Stony Brook under United States of America Serial No. 11/760379 and to the patents and/or patent applications resulting from it."

#include "locktree_unit_test.h"

namespace toku {

// test that the same txn can relock ranges it already owns
// ensure that existing read locks can be upgrading to
// write locks if overlapping and ensure that existing read
// or write locks are consolidated by overlapping relocks.
void locktree_unit_test::test_single_txnid_optimization(void) {
    locktree::manager mgr;
    mgr.create(nullptr, nullptr, nullptr, nullptr);
    DESCRIPTOR desc = nullptr;
    DICTIONARY_ID dict_id = { 1 };
    locktree *lt = mgr.get_lt(dict_id, desc, compare_dbts, nullptr);

    const DBT *zero = get_dbt(0);
    const DBT *one = get_dbt(1);
    const DBT *two = get_dbt(2);
    const DBT *three = get_dbt(3);

    int r;
    TXNID txnid_a = 1001;
    TXNID txnid_b = 2001;

    // the single txnid optimization takes advantage of the fact that
    // a locktree with only locks for a single txnid can be unlocked
    // by just destroy every node. if this is implemented incorrectly,
    // then some other txnid's lock might get lost. so test that no
    // matter where txnid b takes its write lock in the middle of a bunch
    // of txnid a locks, the txnid b lock does not get lost.
    for (int where = 0; where < 4; where++) {
        range_buffer buffer;
        buffer.create();

#define lock_and_append_point_for_txnid_a(key) \
        r = lt->acquire_write_lock(txnid_a, key, key, nullptr); \
        invariant_zero(r); \
        buffer.append(key, key);

#define maybe_point_locks_for_txnid_b(i) \
        if (where == i) { \
            r = lt->acquire_write_lock(txnid_b, one, one, nullptr); \
            invariant_zero(r); \
        }

        lock_and_append_point_for_txnid_a(two);
        maybe_point_locks_for_txnid_b(0);

        lock_and_append_point_for_txnid_a(three);
        maybe_point_locks_for_txnid_b(1);

        lock_and_append_point_for_txnid_a(zero);
        maybe_point_locks_for_txnid_b(2);

        lt->release_locks(txnid_a, &buffer);

        // txnid b does not take a lock on iteration 3
        if (where != 3) {
            struct verify_fn_obj {
                TXNID expected_txnid;
                keyrange *expected_range;
                comparator *cmp;
                bool fn(const keyrange &range, TXNID txnid) {
                    invariant(txnid == expected_txnid);
                    keyrange::comparison c = range.compare(cmp, *expected_range);
                    invariant(c == keyrange::comparison::EQUALS);
                    return true;
                }
            } verify_fn;
            verify_fn.cmp = lt->m_cmp;

            keyrange range;
            range.create(one, one);
            verify_fn.expected_txnid = txnid_b;
            verify_fn.expected_range = &range;
            locktree_iterate<verify_fn_obj>(lt, &verify_fn);
            lt->remove_overlapping_locks_for_txnid(txnid_b, one, one);
        }

        buffer.destroy();
    }

    mgr.release_lt(lt);
    mgr.destroy();
}

} /* namespace toku */

int main(void) {
    toku::locktree_unit_test test;
    test.test_single_txnid_optimization();
    return 0;
}
