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// distlock.h
/* Copyright 2009 10gen 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.
*/
/**
* distributed locking mechanism
*/
#include "../pch.h"
#include "dbclient.h"
#include "connpool.h"
#include "redef_macros.h"
#include "syncclusterconnection.h"
namespace mongo {
class DistributedLock {
public:
/**
* @param takeoverMinutes how long before we steal lock in minutes
*/
DistributedLock( const ConnectionString& conn , const string& name , unsigned takeoverMinutes = 10 );
bool lock_try( string why , BSONObj * other = 0 );
void unlock();
private:
ConnectionString _conn;
string _name;
unsigned _takeoverMinutes;
string _ns;
BSONObj _id;
};
class dist_lock_try {
public:
dist_lock_try( DistributedLock * lock , string why )
: _lock(lock){
_got = _lock->lock_try( why , &_other );
}
~dist_lock_try(){
if ( _got ){
_lock->unlock();
}
}
bool got() const {
return _got;
}
BSONObj other() const {
return _other;
}
private:
DistributedLock * _lock;
bool _got;
BSONObj _other;
};
}
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