/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*
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  This program is free software; you can redistribute it and/or modify
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  published by the Free Software Foundation, and provided that the
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      * Redistributions of source code must retain this COPYING
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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.
  This software is covered by US Patent No. 8,489,638.

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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 <stdio.h>
#include "locktree.h"
#include "test.h"

// Two big txn's grab alternating locks in a single lock tree.
// Eventually lock escalation runs.
// Since the locks can not be consolidated, the out of locks error should be returned.

using namespace toku;

static int verbose = 0;

static inline void locktree_release_lock(locktree *lt, TXNID txn_id, int64_t left_k, int64_t right_k) {
    range_buffer buffer;
    buffer.create();
    DBT left; toku_fill_dbt(&left, &left_k, sizeof left_k);
    DBT right; toku_fill_dbt(&right, &right_k, sizeof right_k);
    buffer.append(&left, &right);
    lt->release_locks(txn_id, &buffer);
    buffer.destroy();
}

// grab a write range lock on int64 keys bounded by left_k and right_k
static int locktree_write_lock(locktree *lt, TXNID txn_id, int64_t left_k, int64_t right_k, bool big_txn) {
    DBT left; toku_fill_dbt(&left, &left_k, sizeof left_k);
    DBT right; toku_fill_dbt(&right, &right_k, sizeof right_k);
    return lt->acquire_write_lock(txn_id, &left, &right, nullptr, big_txn);
}

static void e_callback(TXNID txnid, const locktree *lt, const range_buffer &buffer, void *extra) {
    if (verbose)
        printf("%u %s %" PRIu64 " %p %d %p\n", toku_os_gettid(), __FUNCTION__, txnid, lt, buffer.get_num_ranges(), extra);
}

static uint64_t get_escalation_count(locktree::manager &mgr) {
    LTM_STATUS_S ltm_status;
    mgr.get_status(&ltm_status);

    TOKU_ENGINE_STATUS_ROW key_status = NULL;
    // lookup keyname in status
    for (int i = 0; ; i++) {
        TOKU_ENGINE_STATUS_ROW status = &ltm_status.status[i];
        if (status->keyname == NULL)
            break;
        if (strcmp(status->keyname, "LTM_ESCALATION_COUNT") == 0) {
            key_status = status;
            break;
        }
    }
    assert(key_status);
    return key_status->value.num;
}

int main(int argc, const char *argv[]) {
    uint64_t max_lock_memory = 1000000;

    for (int i = 1; i < argc; i++) {
        if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--verbose") == 0) {
            verbose++;
            continue;
        }
        if (strcmp(argv[i], "--max_lock_memory") == 0 && i+1 < argc) {
            max_lock_memory = atoll(argv[++i]);
            continue;
        }
    }

    int r;

    // create a manager
    locktree::manager mgr;
    mgr.create(nullptr, nullptr, e_callback, nullptr);
    mgr.set_max_lock_memory(max_lock_memory);

    const TXNID txn_a = 10;
    const TXNID txn_b = 100;

    // create lock trees
    DESCRIPTOR desc = nullptr;
    DICTIONARY_ID dict_id = { 1 };
    locktree *lt = mgr.get_lt(dict_id, desc, compare_dbts, nullptr);

    int64_t last_i = -1;
    for (int64_t i = 0; ; i++) {
        if (verbose)
            printf("%" PRId64 "\n", i);
        int64_t k = 2*i;
        r = locktree_write_lock(lt, txn_a, k, k, true);
        if (r != 0) {
            assert(r == TOKUDB_OUT_OF_LOCKS);
            break;
        }
        last_i = i;
        r = locktree_write_lock(lt, txn_b, k+1, k+1, true);
        if (r != 0) {
            assert(r == TOKUDB_OUT_OF_LOCKS);
            break;
        }
    }

    // wait for an escalation to occur
    assert(get_escalation_count(mgr) > 0);

    if (last_i != -1) {
        locktree_release_lock(lt, txn_a, 0, 2*last_i);
        locktree_release_lock(lt, txn_b, 0, 2*last_i+1);
    }

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

    return 0;
}
