public override Task <LockResponse> lockServer(LockRequest request, ServerCallContext context)
{
Console.WriteLine("Locking the server to write" +
request.ObjectId + " in partition " +
request.PartitionId
);
try {
var partitionId = request.PartitionId;
var objectId = request.ObjectId;
var partition = _storage.Partitions[partitionId];
BaseServerObjectInfo objectInfo;
lock (partition.Objects) {
if (!partition.Objects.TryGetValue(objectId, out objectInfo))
{
partition.Objects.Add(objectId, objectInfo = new BaseServerObjectInfo("NA"));
}
}
objectInfo._lock.Set(); //unlock is called inside partition write slave
}
catch (Exception e) {
Console.WriteLine(e.Message);
Console.WriteLine(e.StackTrace);
return(Task.FromResult(new LockResponse {
Acknowledge = "NOK"
}));
}
return(Task.FromResult(new LockResponse {
Acknowledge = "Ok"
}));
}
public void WriteMaster(string objKey, string objValue)
{
var lockRequest = new LockRequest()
{
PartitionId = _id,
ObjectId = objKey
};
var unlockRequest = new UnlockRequest {
PartitionId = _id,
ObjectId = objKey,
ObjectValue = objValue
};
//Very important - order slaves
IEnumerable <SlaveInfo> orderedSlaves = SlaveServers.OrderBy(s => s.ServerId);
BaseServerObjectInfo objectInfo;
lock (Objects) {
if (!Objects.TryGetValue(objKey, out objectInfo))
{
Objects.Add(objKey, objectInfo = new BaseServerObjectInfo("NA"));
}
}
objectInfo._lock.Set();
objectInfo.Write(objValue);
foreach (var slave in orderedSlaves)
{
try {
slave.SlaveChannel.lockServer(lockRequest);
}
catch (Exception) {
Console.WriteLine($"Error locking partition {_id} slave {slave.ServerId}");
}
}
foreach (var slave in orderedSlaves)
{
try {
slave.SlaveChannel.unlockServer(unlockRequest);
}
catch (Exception) {
Console.WriteLine($"Error unlocking partition {_id} slave {slave.ServerId}");
}
}
objectInfo._lock.Reset();
}
