/// <exception cref="Org.Apache.Hadoop.FS.InvalidRequestException"/>
public virtual void UnregisterSlot(ShortCircuitShm.SlotId slotId)
{
lock (this)
{
if (!enabled)
{
if (Log.IsTraceEnabled())
{
Log.Trace("unregisterSlot: ShortCircuitRegistry is " + "not enabled.");
}
throw new NotSupportedException();
}
ShortCircuitShm.ShmId shmId = slotId.GetShmId();
ShortCircuitRegistry.RegisteredShm shm = segments[shmId];
if (shm == null)
{
throw new InvalidRequestException("there is no shared memory segment " + "registered with shmId "
+ shmId);
}
ShortCircuitShm.Slot slot = shm.GetSlot(slotId.GetSlotIdx());
slot.MakeInvalid();
shm.UnregisterSlot(slotId.GetSlotIdx());
slots.Remove(slot.GetBlockId(), slot);
}
}
/// <summary>Handle a DFSClient request to create a new memory segment.</summary>
/// <param name="clientName">Client name as reported by the client.</param>
/// <param name="sock">
/// The DomainSocket to associate with this memory
/// segment. When this socket is closed, or the
/// other side writes anything to the socket, the
/// segment will be closed. This can happen at any
/// time, including right after this function returns.
/// </param>
/// <returns>
/// A NewShmInfo object. The caller must close the
/// NewShmInfo object once they are done with it.
/// </returns>
/// <exception cref="System.IO.IOException">If the new memory segment could not be created.
/// </exception>
public virtual ShortCircuitRegistry.NewShmInfo CreateNewMemorySegment(string clientName
, DomainSocket sock)
{
ShortCircuitRegistry.NewShmInfo info = null;
ShortCircuitRegistry.RegisteredShm shm = null;
ShortCircuitShm.ShmId shmId = null;
lock (this)
{
if (!enabled)
{
if (Log.IsTraceEnabled())
{
Log.Trace("createNewMemorySegment: ShortCircuitRegistry is " + "not enabled.");
}
throw new NotSupportedException();
}
FileInputStream fis = null;
try
{
do
{
shmId = ShortCircuitShm.ShmId.CreateRandom();
}while (segments.Contains(shmId));
fis = shmFactory.CreateDescriptor(clientName, ShmLength);
shm = new ShortCircuitRegistry.RegisteredShm(clientName, shmId, fis, this);
}
finally
{
if (shm == null)
{
IOUtils.CloseQuietly(fis);
}
}
info = new ShortCircuitRegistry.NewShmInfo(shmId, fis);
segments[shmId] = shm;
}
// Drop the registry lock to prevent deadlock.
// After this point, RegisteredShm#handle may be called at any time.
watcher.Add(sock, shm);
if (Log.IsTraceEnabled())
{
Log.Trace("createNewMemorySegment: created " + info.shmId);
}
return(info);
}
/// <exception cref="Org.Apache.Hadoop.FS.InvalidRequestException"/>
public virtual void RegisterSlot(ExtendedBlockId blockId, ShortCircuitShm.SlotId
slotId, bool isCached)
{
lock (this)
{
if (!enabled)
{
if (Log.IsTraceEnabled())
{
Log.Trace(this + " can't register a slot because the " + "ShortCircuitRegistry is not enabled."
);
}
throw new NotSupportedException();
}
ShortCircuitShm.ShmId shmId = slotId.GetShmId();
ShortCircuitRegistry.RegisteredShm shm = segments[shmId];
if (shm == null)
{
throw new InvalidRequestException("there is no shared memory segment " + "registered with shmId "
+ shmId);
}
ShortCircuitShm.Slot slot = shm.RegisterSlot(slotId.GetSlotIdx(), blockId);
if (isCached)
{
slot.MakeAnchorable();
}
else
{
slot.MakeUnanchorable();
}
bool added = slots.Put(blockId, slot);
Preconditions.CheckState(added);
if (Log.IsTraceEnabled())
{
Log.Trace(this + ": registered " + blockId + " with slot " + slotId + " (isCached="
+ isCached + ")");
}
}
}
public virtual void RemoveShm(ShortCircuitShm shm)
{
lock (this)
{
if (Log.IsTraceEnabled())
{
Log.Debug("removing shm " + shm);
}
// Stop tracking the shmId.
ShortCircuitRegistry.RegisteredShm removedShm = Sharpen.Collections.Remove(segments
, shm.GetShmId());
Preconditions.CheckState(removedShm == shm, "failed to remove " + shm.GetShmId());
// Stop tracking the slots.
for (IEnumerator <ShortCircuitShm.Slot> iter = shm.SlotIterator(); iter.HasNext();)
{
ShortCircuitShm.Slot slot = iter.Next();
bool removed = slots.Remove(slot.GetBlockId(), slot);
Preconditions.CheckState(removed);
slot.MakeInvalid();
}
// De-allocate the memory map and close the shared file.
shm.Free();
}
}