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103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
// optime.h - OpTime class
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "../db/concurrency.h"
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namespace mongo {
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/* Operation sequence #. A combination of current second plus an ordinal value.
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*/
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#pragma pack(4)
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class OpTime {
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unsigned i;
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unsigned secs;
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static OpTime last;
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public:
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unsigned getSecs() const {
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return secs;
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}
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OpTime(unsigned long long date) {
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reinterpret_cast<unsigned long long&>(*this) = date;
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}
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OpTime(unsigned a, unsigned b) {
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secs = a;
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i = b;
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}
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OpTime() {
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secs = 0;
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i = 0;
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}
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static OpTime now() {
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unsigned t = (unsigned) time(0);
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// DEV assertInWriteLock();
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if ( last.secs == t ) {
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last.i++;
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return last;
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}
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last = OpTime(t, 1);
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return last;
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}
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/* We store OpTime's in the database as BSON Date datatype -- we needed some sort of
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64 bit "container" for these values. While these are not really "Dates", that seems a
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better choice for now than say, Number, which is floating point. Note the BinData type
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is perhaps the cleanest choice, lacking a true unsigned64 datatype, but BinData has 5
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bytes of overhead.
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*/
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unsigned long long asDate() const {
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return *((unsigned long long *) &i);
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}
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// unsigned long long& asDate() { return *((unsigned long long *) &i); }
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bool isNull() {
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return secs == 0;
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}
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string toStringLong() const {
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char buf[64];
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time_t_to_String(secs, buf);
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stringstream ss;
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ss << buf << ' ';
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ss << hex << secs << ':' << i;
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return ss.str();
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}
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string toString() const {
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stringstream ss;
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ss << hex << secs << ':' << i;
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return ss.str();
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}
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operator string() const { return toString(); }
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bool operator==(const OpTime& r) const {
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return i == r.i && secs == r.secs;
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}
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bool operator!=(const OpTime& r) const {
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return !(*this == r);
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}
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bool operator<(const OpTime& r) const {
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if ( secs != r.secs )
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return secs < r.secs;
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return i < r.i;
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}
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};
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#pragma pack()
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} // namespace mongo
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