// Write to the journal file
function _journalWrite(str,handler) {
var
self = this,
b = new Buffer(str+"\n\0");
return fnlock.lock('journalWrite',function(release){
return fs.write(self._j,b,0,b.length,self._jPos,function(err){
if ( err ) {
_debug("ERROR:\tError writting to the journal file: ",err);
return handler(err,null);
}
// Seek to the right position
self._jPos += b.length-1;
// Sync with the disk
return fs.fsync(self._j,function(err){
if ( err ) {
_debug("ERROR:\tError syncing journal to the disk: ",err);
return handler(err,null);
}
// Release the lock
release();
// Done
return handler(null,true);
});
});
});
}
// For for N id's for a specific key
function bizAskIDs(key,n,handler) {
var
self = this,
opts = (self._opts.keyOptions && typeof self._opts.keyOptions[key] == "object") ? self._opts.keyOptions[key] : self._opts,
lastID;
// Lock
return fnlock.lock("ask_"+key,function(release){
// Do we need to GET the key ?
return _if ( !self._idMap[key],
function(next){
self.get(key,function(err,value){
if ( err ) {
_debug("ERROR:\tError getting value for key '"+key+"': ",err);
release();
return handler({code: "EGET", description: "Error getting value for key '"+key+"'.", details: err.toString()});
}
self._idMap[key] = value;
return next();
});
},
function() {
// No value ?
if ( !self._idMap[key] ) {
self._idMap[key] = self._bizFirstID(key);
self._changed[key] = true;
}
// Generate the id's
return self._bizAskIDs(key,n,opts,function(err,ids){
if ( err ) {
_debug("ERROR:\tError asking for "+n+" ids for '"+key+"': ",err);
release();
return handler(err,null);
}
lastID = ids[ids.length-1];
// Store
return self._journalWrite(key+"\r"+lastID,function(err,ok){
if ( err ) {
_debug("ERROR\tError writting to journal file: ",err);
release();
return handler({code: "EJOUWR", description: "Error writting to the journal file", detail: err.toString() });
}
// Replace on the id map
if ( ids.length > 0 ) {
self._idMap[key] = ids[ids.length-1];
self._changed[key] = true;
}
// Release
release();
// Sent to user
return handler(null,ids);
});
});
}
);
});
}