qid_gen.cc

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// Copyright (C) 2011-2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
// qid_gen defines a generator for query id's
//
// We probably want to merge this with the weighted random in the nsas
// (and other parts where we need randomness, perhaps another thing
// for a general libutil?)
 
#include <config.h>
 
#include <util/random/qid_gen.h>
 
#include <sys/time.h>
 
namespace isc {
namespace util {
namespace random {
 
QidGenerator qid_generator_instance;
 
QidGenerator&
QidGenerator::getInstance() {
    return (qid_generator_instance);
}
 
QidGenerator::QidGenerator() : dist_(0, 65535),
                               vgen_(generator_, dist_)
{
    seed();
}
 
void
QidGenerator::seed() {
    struct timeval tv;
    gettimeofday(&tv, 0);
    generator_.seed((tv.tv_sec * 1000000) + tv.tv_usec);
}
 
uint16_t
QidGenerator::generateQid() {
    return (vgen_());
}
 
 
} // namespace random
} // namespace util
} // namespace isc