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/**
* Copyright (C) 2008 10gen Inc.
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/db/repl/health.h"
#include "mongo/db/repl/member_state.h"
#include "mongo/util/concurrency/rwlock.h"
namespace mongo {
namespace repl {
class Member;
/* safe container for our state that keeps member pointer and state variables always aligned */
class StateBox : boost::noncopyable {
public:
struct SP { // SP is like pair<MemberState,const Member *> but nicer
SP() : state(MemberState::RS_STARTUP), primary(0) { }
MemberState state;
const Member *primary;
};
const SP get() {
rwlock lk(m, false);
return sp;
}
MemberState getState() const {
rwlock lk(m, false);
return sp.state;
}
const Member* getPrimary() const {
rwlock lk(m, false);
return sp.primary;
}
void change(MemberState s, const Member *self);
void set(MemberState s, const Member *p) {
rwlock lk(m, true);
sp.state = s;
sp.primary = p;
}
void setSelfPrimary(const Member *self) { change(MemberState::RS_PRIMARY, self); }
void setOtherPrimary(const Member *mem) {
rwlock lk(m, true);
verify( !sp.state.primary() );
sp.primary = mem;
}
void noteRemoteIsPrimary(const Member *remote) {
rwlock lk(m, true);
verify(!sp.state.primary());
sp.primary = remote;
}
StateBox() : m("StateBox") { }
private:
RWLock m;
SP sp;
};
} // namespace repl
} // namespace mongo
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