public void FailoverTo(params string[] readWriteHosts)
{
Interlocked.Increment(ref RedisState.TotalFailovers);
lock (clients)
{
for (var i = 0; i < clients.Length; i++)
{
var redis = clients[i];
if (redis != null)
{
RedisState.DeactivateClient(redis);
}
clients[i] = null;
}
RedisResolver.ResetMasters(readWriteHosts);
}
if (this.OnFailover != null)
{
foreach (var callback in OnFailover)
{
try
{
callback(this);
}
catch (Exception ex)
{
Log.Error("Error firing OnFailover callback(): ", ex);
}
}
}
}
public void FailoverTo(IEnumerable <string> readWriteHosts, IEnumerable <string> readOnlyHosts)
{
Interlocked.Increment(ref RedisState.TotalFailovers);
lock (readClients)
{
for (var i = 0; i < readClients.Length; i++)
{
var redis = readClients[i];
if (redis != null)
{
RedisState.DeactivateClient(redis);
}
readClients[i] = null;
}
RedisResolver.ResetSlaves(readOnlyHosts);
}
lock (writeClients)
{
for (var i = 0; i < writeClients.Length; i++)
{
var redis = writeClients[i];
if (redis != null)
{
RedisState.DeactivateClient(redis);
}
writeClients[i] = null;
}
RedisResolver.ResetMasters(readWriteHosts);
}
if (this.OnFailover != null)
{
foreach (var callback in OnFailover)
{
try
{
callback(this);
}
catch (Exception ex)
{
Log.Error("Error firing OnFailover callback(): ", ex);
}
}
}
}
/// <summary>
/// Returns a ReadOnly client using the hosts defined in ReadOnlyHosts.
/// </summary>
/// <returns></returns>
public virtual IRedisClient GetReadOnlyClient()
{
try
{
var poolTimedOut = false;
var inactivePoolIndex = -1;
lock (readClients)
{
AssertValidReadOnlyPool();
RedisClient inActiveClient;
while ((inactivePoolIndex = GetInActiveReadClient(out inActiveClient)) == -1)
{
if (PoolTimeout.HasValue)
{
// wait for a connection, break out if made to wait too long
if (!Monitor.Wait(readClients, PoolTimeout.Value))
{
poolTimedOut = true;
break;
}
}
else
{
Monitor.Wait(readClients, RecheckPoolAfterMs);
}
}
//inActiveClient != null only for Valid InActive Clients
if (inActiveClient != null)
{
ReadPoolIndex++;
inActiveClient.Active = true;
InitClient(inActiveClient);
return(inActiveClient);
}
}
if (poolTimedOut)
{
throw new TimeoutException(PoolTimeoutError);
}
//Reaches here when there's no Valid InActive Clients
try
{
//inactivePoolIndex = index of reservedSlot || index of invalid client
var existingClient = readClients[inactivePoolIndex];
if (existingClient != null && existingClient != reservedSlot && existingClient.HadExceptions)
{
RedisState.DeactivateClient(existingClient);
}
var newClient = InitNewClient(RedisResolver.CreateSlaveClient(inactivePoolIndex));
//Put all blocking I/O or potential Exceptions before lock
lock (readClients)
{
//If existingClient at inactivePoolIndex changed (failover) return new client outside of pool
if (readClients[inactivePoolIndex] != existingClient)
{
if (Log.IsDebugEnabled)
{
Log.Debug("readClients[inactivePoolIndex] != existingClient: {0}".Fmt(readClients[inactivePoolIndex]));
}
Interlocked.Increment(ref RedisState.TotalClientsCreatedOutsidePool);
//Don't handle callbacks for new client outside pool
newClient.ClientManager = null;
return(newClient); //return client outside of pool
}
ReadPoolIndex++;
readClients[inactivePoolIndex] = newClient;
return(newClient);
}
}
catch
{
//Revert free-slot for any I/O exceptions that can throw
lock (readClients)
{
readClients[inactivePoolIndex] = null; //free slot
}
throw;
}
}
finally
{
RedisState.DisposeExpiredClients();
}
}
/// <summary>
/// Returns a Read/Write client (The default) using the hosts defined in ReadWriteHosts
/// </summary>
/// <returns></returns>
public IRedisClient GetClient()
{
try
{
var poolTimedOut = false;
var inactivePoolIndex = -1;
lock (writeClients)
{
AssertValidReadWritePool();
RedisClient inActiveClient;
while ((inactivePoolIndex = GetInActiveWriteClient(out inActiveClient)) == -1)
{
if (PoolTimeout.HasValue)
{
// wait for a connection, cry out if made to wait too long
if (!Monitor.Wait(writeClients, PoolTimeout.Value))
{
poolTimedOut = true;
break;
}
}
else
{
Monitor.Wait(writeClients, RecheckPoolAfterMs);
}
}
//inActiveClient != null only for Valid InActive Clients
if (inActiveClient != null)
{
WritePoolIndex++;
inActiveClient.Active = true;
InitClient(inActiveClient);
return(inActiveClient);
}
}
if (poolTimedOut)
{
throw new TimeoutException(PoolTimeoutError);
}
//Reaches here when there's no Valid InActive Clients
try
{
//inactivePoolIndex = index of reservedSlot || index of invalid client
var existingClient = writeClients[inactivePoolIndex];
if (existingClient != null && existingClient != reservedSlot && existingClient.HadExceptions)
{
RedisState.DeactivateClient(existingClient);
}
var newClient = InitNewClient(RedisResolver.CreateMasterClient(inactivePoolIndex));
//Put all blocking I/O or potential Exceptions before lock
lock (writeClients)
{
//If existingClient at inactivePoolIndex changed (failover) return new client outside of pool
if (writeClients[inactivePoolIndex] != existingClient)
{
if (Log.IsDebugEnabled)
{
Log.Debug("writeClients[inactivePoolIndex] != existingClient: {0}".Fmt(writeClients[inactivePoolIndex]));
}
return(newClient); //return client outside of pool
}
WritePoolIndex++;
writeClients[inactivePoolIndex] = newClient;
return(newClient);
}
}
catch
{
//Revert free-slot for any I/O exceptions that can throw (before lock)
lock (writeClients)
{
writeClients[inactivePoolIndex] = null; //free slot
}
throw;
}
}
finally
{
RedisState.DisposeExpiredClients();
}
}
/// <summary>
/// Returns a Read/Write client (The default) using the hosts defined in ReadWriteHosts
/// </summary>
/// <returns></returns>
public IRedisClient GetClient()
{
try
{
var inactivePoolIndex = -1;
lock (clients)
{
AssertValidPool();
RedisClient inActiveClient;
//-1 when no available clients otherwise index of reservedSlot or existing Client
inactivePoolIndex = GetInActiveClient(out inActiveClient);
//inActiveClient != null only for Valid InActive Clients
if (inActiveClient != null)
{
poolIndex++;
inActiveClient.Active = true;
return(inActiveClient);
}
}
//Reaches here when there's no Valid InActive Clients
try
{
//inactivePoolIndex == -1 || index of reservedSlot || index of invalid client
var existingClient = inactivePoolIndex >= 0 && inactivePoolIndex < clients.Length
? clients[inactivePoolIndex]
: null;
if (existingClient != null && existingClient != reservedSlot && existingClient.HadExceptions)
{
RedisState.DeactivateClient(existingClient);
}
var newClient = InitNewClient(RedisResolver.CreateMasterClient(Math.Max(inactivePoolIndex, 0)));
//Put all blocking I/O or potential Exceptions before lock
lock (clients)
{
//Create new client outside of pool when max pool size exceeded
//Reverting free-slot not needed when -1 since slwo wasn't reserved or
//when existingClient changed (failover) since no longer reserver
var stillReserved = inactivePoolIndex >= 0 && inactivePoolIndex < clients.Length &&
clients[inactivePoolIndex] == existingClient;
if (inactivePoolIndex == -1 || !stillReserved)
{
if (Log.IsDebugEnabled)
{
Log.Debug("clients[inactivePoolIndex] != existingClient: {0}".Fmt(!stillReserved ? "!stillReserved" : "-1"));
}
Interlocked.Increment(ref RedisState.TotalClientsCreatedOutsidePool);
//Don't handle callbacks for new client outside pool
newClient.ClientManager = null;
return(newClient);
}
poolIndex++;
clients[inactivePoolIndex] = newClient;
return(newClient);
}
}
catch
{
//Revert free-slot for any I/O exceptions that can throw (before lock)
lock (clients)
{
if (inactivePoolIndex >= 0 && inactivePoolIndex < clients.Length)
{
clients[inactivePoolIndex] = null;
}
}
throw;
}
}
finally
{
RedisState.DisposeExpiredClients();
}
}