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#  Copyright 2010 - present MongoDB, Inc.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#  http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

use strict;
use warnings;
use Config;
use if $Config{usethreads}, 'threads';
use Test::More;

BEGIN { plan skip_all => 'requires threads' unless $Config{usethreads} }

BEGIN { plan skip_all => 'threads not supported before Perl 5.8.5' unless $] ge "5.008005" }

BEGIN { plan skip_all => 'threads tests flaky on older Windows Perls' if $^O eq "MSWin32" && $] lt "5.020000" }

use MongoDB;
use Try::Tiny;

use lib "t/lib";
use MongoDBTest qw/skip_unless_mongod build_client get_test_db/;

skip_unless_mongod();

my $conn = build_client();
my $testdb = get_test_db($conn);

my $col = $testdb->get_collection('kooh');
$col->drop;

{

    my $ret = try {
        threads->create(sub {
            $conn->reconnect;
            $col->insert_one({ foo => 42 })->inserted_id;
        })->join->value;
    }
    catch {
        diag $_;
    };

    ok $ret, 'we survived destruction of a cloned connection';

    my $o = $col->find_one({ foo => 42 });
    is $ret, $o->{_id}, 'we inserted and joined the OID back';
}

{
    $col->drop;
    my ($n_threads, $n_inserts) = $ENV{AUTOMATED_TESTING} ? (10,1000) : (5, 100);
    note "inserting $n_inserts items each in $n_threads threads";
    my @threads = map {
        threads->create(sub {
            $conn->reconnect;
            my $col = $conn->get_database($testdb->name)->get_collection('kooh');
            my @ids = map { $col->insert_one({ foo => threads->self->tid })->inserted_id } 1 .. $n_inserts;
            # reading our writes while still in the thread should ensure
            # inserts are globally visible before the thread exits
            my @docs = map { $col->find_one({ _id => $_}) } @ids;
            return @ids;
        })
    } 1 .. $n_threads;

    my @vals = map { ( $_->tid ) x $n_inserts } @threads;
    my @ids = map { $_->join } @threads;

    my $expected_n = $n_threads * $n_inserts;
    is( $col->count_documents({}), $expected_n, "expected number of docs inserted" );
    is( scalar(@ids), $expected_n, "expected number of ids returned" );
    is( scalar keys %{ { map { ($_ => undef) } @ids } }, $expected_n, "ids are unique" );

    is_deeply(
        [map { $col->find_one({ _id => $_ })->{foo} } @ids],
        [@vals],
        'right values inserted from threads',
    );
}

done_testing();

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