/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*======
This file is part of PerconaFT.


Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2,
    as published by the Free Software Foundation.

    PerconaFT 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.

    You should have received a copy of the GNU General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.

----------------------------------------

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License, version 3,
    as published by the Free Software Foundation.

    PerconaFT 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 Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
======= */

#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."

// verify that cachetable prefetch multiple blocks hits the cachetable size limit
// and flushes eventually happen.


#include "test.h"
#include "cachetable/cachetable-internal.h"

static int flush_calls = 0;
static int flush_evict_calls = 0;
static int evicted_keys = 0;

static void
flush (CACHEFILE f __attribute__((__unused__)),
       int UU(fd),
       CACHEKEY k,
       void *v     __attribute__((__unused__)),
       void** UU(dd),
       void *e     __attribute__((__unused__)),
       PAIR_ATTR s      __attribute__((__unused__)),
       PAIR_ATTR* new_size      __attribute__((__unused__)),
       bool w,
       bool keep,
       bool f_ckpt __attribute__((__unused__)),
        bool UU(is_clone)
       ) {
    assert(w == false);
    sleep(1);
    flush_calls++;
    if (keep == false) {
        flush_evict_calls++;
        if (verbose) printf("%s:%d flush %" PRId64 "\n", __FUNCTION__, __LINE__, k.b);
        evicted_keys |= 1 << k.b;
    }
}

static int fetch_calls = 0;

static int
fetch (CACHEFILE f        __attribute__((__unused__)),
       PAIR UU(p),
       int UU(fd),
       CACHEKEY k,
       uint32_t fullhash __attribute__((__unused__)),
       void **value,
       void** UU(dd),
       PAIR_ATTR *sizep,
       int  *dirtyp,
       void *extraargs    __attribute__((__unused__))
       ) {

    fetch_calls++;
    if (verbose) printf("%s:%d %" PRId64 "\n", __FUNCTION__, __LINE__, k.b);

    *value = 0;
    *sizep = make_pair_attr(1);
    *dirtyp = 0;

    return 0;
}

// Note: cachetable_size_limit must be a power of 2
static void cachetable_prefetch_flowcontrol_test (int cachetable_size_limit) {
    int r;
    CACHETABLE ct;
    toku_cachetable_create(&ct, cachetable_size_limit, ZERO_LSN, nullptr);
    evictor_test_helpers::set_hysteresis_limits(&ct->ev, cachetable_size_limit, cachetable_size_limit);
    evictor_test_helpers::disable_ev_thread(&ct->ev);
    const char *fname1 = TOKU_TEST_FILENAME;
    unlink(fname1);
    CACHEFILE f1;
    r = toku_cachetable_openf(&f1, ct, fname1, O_RDWR|O_CREAT, S_IRWXU|S_IRWXG|S_IRWXO); assert(r == 0);

    int i;
    CACHETABLE_WRITE_CALLBACK wc = def_write_callback(NULL);
    wc.flush_callback = flush;

    // prefetch keys 0 .. N-1.  they should all fit in the cachetable
    for (i=0; i<cachetable_size_limit+1; i++) {
        CACHEKEY key = make_blocknum(i);
        uint32_t fullhash = toku_cachetable_hash(f1, key);
        bool doing_prefetch = false;
        r = toku_cachefile_prefetch(f1, key, fullhash, wc, fetch, def_pf_req_callback, def_pf_callback, 0, &doing_prefetch);
        assert(doing_prefetch);
        toku_cachetable_verify(ct);
    }

    // wait for all of the blocks to be fetched
    sleep(3);

    // prefetch keys N .. 2*N-1.  0 .. N-1 should be evicted.
    for (i=i+1; i<2*cachetable_size_limit; i++) {
        CACHEKEY key = make_blocknum(i);
        uint32_t fullhash = toku_cachetable_hash(f1, key);
        bool doing_prefetch = false;
        r = toku_cachefile_prefetch(f1, key, fullhash, wc, fetch, def_pf_req_callback, def_pf_callback, 0, &doing_prefetch);
        assert(!doing_prefetch);
        toku_cachetable_verify(ct);
    }


    toku_cachefile_close(&f1, false, ZERO_LSN);
    if (verbose) printf("%s:%d 0x%x 0x%x\n", __FUNCTION__, __LINE__,
        evicted_keys, (1 << (2*cachetable_size_limit))-1);
    toku_cachetable_close(&ct);
}

int
test_main(int argc, const char *argv[]) {
    default_parse_args(argc, argv);
    cachetable_prefetch_flowcontrol_test(8);
    return 0;
}