/* -*- 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 get_and_pin waits while a prefetch block is pending */

#include "test.h"

bool do_pf;
bool expect_pf;

static void
flush (CACHEFILE f __attribute__((__unused__)),
       int UU(fd),
       CACHEKEY k  __attribute__((__unused__)),
       void *v     __attribute__((__unused__)),
       void** UU(dd),
       void *e     __attribute__((__unused__)),
       PAIR_ATTR s      __attribute__((__unused__)),
       PAIR_ATTR* new_size      __attribute__((__unused__)),
       bool w      __attribute__((__unused__)),
       bool keep   __attribute__((__unused__)),
       bool c      __attribute__((__unused__)),
        bool UU(is_clone)
       ) {
    assert(w == false);
}

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

    if(!expect_pf) {
        sleep(2);
    }
    *value = 0;
    *sizep = make_pair_attr(2);
    *dirtyp = 0;

    return 0;
}

static bool pf_req_callback(void* UU(ftnode_pv), void* UU(read_extraargs)) {
    if (do_pf) {
        assert(expect_pf);
        return true;
    }
    else {
        return false;
    }
}

static int pf_callback(void* UU(ftnode_pv), void* UU(dd), void* UU(read_extraargs), int UU(fd), PAIR_ATTR* UU(sizep)) {
    assert(expect_pf);
    sleep(2);
    *sizep = make_pair_attr(2);
    return 0;
}

static uint64_t tdelta_usec(struct timeval *tend, struct timeval *tstart) {
    uint64_t t = tend->tv_sec * 1000000 + tend->tv_usec;
    t -= tstart->tv_sec * 1000000 + tstart->tv_usec;
    return t;
}

static void cachetable_prefetch_maybegetandpin_test (bool do_partial_fetch) {
    const int test_limit = 2;
    int r;
    CACHETABLE ct;
    toku_cachetable_create(&ct, test_limit, ZERO_LSN, nullptr);
    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);
    expect_pf = false;
    do_pf = false;
    CACHEKEY key = make_blocknum(0);
    uint32_t fullhash = toku_cachetable_hash(f1, make_blocknum(0));
    CACHETABLE_WRITE_CALLBACK wc = def_write_callback(NULL);
    wc.flush_callback = flush;
    if (do_partial_fetch) {
        expect_pf = true;
        void* value;
        long size;
        r = toku_cachetable_get_and_pin(
            f1, 
            key, 
            fullhash, 
            &value, 
            &size, 
            wc, 
            fetch,
            pf_req_callback,
            pf_callback,
            true, 
            0
            );
        assert(r==0);
        r = toku_test_cachetable_unpin(f1, key, fullhash, CACHETABLE_CLEAN, make_pair_attr(1));
    }

    struct timeval tstart;
    gettimeofday(&tstart, NULL);

    // prefetch block 0. this will take 2 seconds.
    do_pf = true;
    r = toku_cachefile_prefetch(f1, key, fullhash, wc, fetch, pf_req_callback, pf_callback, 0, NULL);
    toku_cachetable_verify(ct);

    // verify that get_and_pin waits while the prefetch is in progress
    void *v = 0;
    long size = 0;
    do_pf = false;
    r = toku_cachetable_get_and_pin_nonblocking(f1, key, fullhash, &v, &size, wc, fetch, pf_req_callback, pf_callback, PL_WRITE_EXPENSIVE, NULL, NULL);
    assert(r==TOKUDB_TRY_AGAIN);
    r = toku_cachetable_get_and_pin(f1, key, fullhash, &v, &size, wc, fetch, pf_req_callback, pf_callback, true, NULL);
    assert(r == 0 && v == 0 && size == 2);

    struct timeval tend;
    gettimeofday(&tend, NULL);

    assert(tdelta_usec(&tend, &tstart) >= 1900000);

    toku_cachetable_verify(ct);

    r = toku_test_cachetable_unpin(f1, key, fullhash, CACHETABLE_CLEAN, make_pair_attr(1));
    assert(r == 0);
    toku_cachetable_verify(ct);

    toku_cachefile_close(&f1, false, ZERO_LSN);
    toku_cachetable_close(&ct);
}

int
test_main(int argc, const char *argv[]) {
    default_parse_args(argc, argv);
    cachetable_prefetch_maybegetandpin_test(true);
    cachetable_prefetch_maybegetandpin_test(false);
    return 0;
}