/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
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  TokuDB, Tokutek Fractal Tree Indexing Library.
  Copyright (C) 2007-2013 Tokutek, Inc.

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  This program is distributed in the hope that it will be useful, but
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  The technology is licensed by the Massachusetts Institute of
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  Foundation of State University of New York at Stony Brook under
  United States of America Serial No. 11/760379 and to the patents
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  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 "$Id$"
#include "test.h"

#include <stdio.h>
#include <stdlib.h>

#include <toku_pthread.h>
#include <unistd.h>
#include <memory.h>
#include <sys/stat.h>
#include <db.h>

#include "threaded_stress_test_helpers.h"

//
// This test is a form of stress that does operations on a single dictionary:
// We create a dictionary bigger than the cachetable (around 4x greater).
// Then, we spawn a bunch of pthreads that do the following:
//  - scan dictionary forward with bulk fetch
//  - scan dictionary forward slowly
//  - scan dictionary backward with bulk fetch
//  - scan dictionary backward slowly
//  - update existing values in the dictionary with db->put(DB_YESOVERWRITE)
//  - do random point queries into the dictionary
// With the small cachetable, this should produce quite a bit of churn in reading in and evicting nodes.
// If the test runs to completion without crashing, we consider it a success.
//
// This test differs from stress1 in that it grows the database through
// update operations.
//

static int remove_and_recreate_me(DB_TXN *UU(txn), ARG arg, void* UU(operation_extra), void *UU(stats_extra)) {
    int r;
    int db_index = myrandom_r(arg->random_data)%arg->cli->num_DBs;
    DB* db = arg->dbp[db_index];
    r = (db)->close(db, 0); CKERR(r);

    char name[30];
    ZERO_ARRAY(name);
    get_ith_table_name(name, sizeof(name), db_index);

    r = arg->env->dbremove(arg->env, null_txn, name, nullptr, 0);
    CKERR(r);

    r = db_create(&(arg->dbp[db_index]), arg->env, 0);
    assert(r == 0);
    // TODO: Need to call before_db_open_hook() and after_db_open_hook()
    r = arg->dbp[db_index]->open(arg->dbp[db_index], null_txn, name, nullptr, DB_BTREE, DB_CREATE, 0666);
    assert(r == 0);
    return 0;
}

static void
stress_table(DB_ENV *env, DB **dbp, struct cli_args *cli_args) {
    //
    // the threads that we want:
    //   - one thread constantly updating random values
    //   - one thread doing table scan with bulk fetch
    //   - one thread doing table scan without bulk fetch
    //   - one thread doing random point queries
    //

    if (verbose) printf("starting creation of pthreads\n");
    const int num_threads = 5 + cli_args->num_update_threads + cli_args->num_ptquery_threads;
    struct arg myargs[num_threads];
    for (int i = 0; i < num_threads; i++) {
        arg_init(&myargs[i], dbp, env, cli_args);
    }

    struct scan_op_extra soe[4];

    // make the forward fast scanner
    soe[0].fast = true;
    soe[0].fwd = true;
    soe[0].prefetch = false;
    myargs[0].lock_type = STRESS_LOCK_SHARED;
    myargs[0].operation_extra = &soe[0];
    myargs[0].operation = scan_op;

    // make the forward slow scanner
    soe[1].fast = false;
    soe[1].fwd = true;
    soe[1].prefetch = false;
    myargs[1].lock_type = STRESS_LOCK_SHARED;
    myargs[1].operation_extra = &soe[1];
    myargs[1].operation = scan_op;

    // make the backward fast scanner
    soe[2].fast = true;
    soe[2].fwd = false;
    soe[2].prefetch = false;
    myargs[2].lock_type = STRESS_LOCK_SHARED;
    myargs[2].operation_extra = &soe[2];
    myargs[2].operation = scan_op;

    // make the backward slow scanner
    soe[3].fast = false;
    soe[3].fwd = false;
    soe[3].prefetch = false;
    myargs[3].lock_type = STRESS_LOCK_SHARED;
    myargs[3].operation_extra = &soe[3];
    myargs[3].operation = scan_op;

    // make the guy that removes and recreates the db
    myargs[4].lock_type = STRESS_LOCK_EXCL;
    myargs[4].sleep_ms = 2000; // maybe make this a runtime param at some point
    myargs[4].operation = remove_and_recreate_me;

    // make the guy that updates the db
    struct update_op_args uoe = get_update_op_args(cli_args, NULL);
    for (int i = 5; i < 5 + cli_args->num_update_threads; ++i) {
        myargs[i].bounded_element_range = false;
        myargs[i].lock_type = STRESS_LOCK_SHARED;
        myargs[i].operation_extra = &uoe;
        myargs[i].operation = update_op;
    }

    // make the guy that does point queries
    for (int i = 5 + cli_args->num_update_threads; i < num_threads; i++) {
        myargs[i].lock_type = STRESS_LOCK_SHARED;
        myargs[i].bounded_element_range = false;
        myargs[i].operation = ptquery_op_no_check;
    }

    run_workers(myargs, num_threads, cli_args->num_seconds, false, cli_args);
}

int
test_main(int argc, char *const argv[]) {
    struct cli_args args = get_default_args();
    parse_stress_test_args(argc, argv, &args);
    stress_test_main(&args);
    return 0;
}
