public ITypedStream GetTypedStream(OpenMode mode, Type t)
{
lock (SyncRoot)
{
AssertNotDisposed();
if (mode != OpenMode.Read)
{
AssertCurrentVersion();
}
// We first check streams in cache, then try to load.
ManagedTypedStream stream = GetCachedTypedStream(t.FullName, mode);
if (stream != null)
{
return(stream);
}
// We can also check in base node.
ManagedNode b = CacheBase();
if (b != null)
{
return(b.GetTypedStream(mode, t));
}
return(null);
}
}
public void CopyTo([NotNull] ITypedStream s)
{
AssertNotDisposed();
ManagedTypedStream stream = s as ManagedTypedStream;
lock (Inner)
{
stream.AssertNotDisposed();
lock (stream.Inner)
{
// Implementation notes: should be journalled in future.
uint[] locations = Inner.ObjectLocations;
for (int i = 0; i < locations.Length; i++)
{
string type = Inner.GetObjectType(locations[i]);
if (usesRaw)
{
byte[] data = Inner.Read(locations[i]) as byte[];
stream.Inner.Write(locations[i], type, data);
}
else
{
object data = Inner.Read(locations[i]);
stream.Inner.Write(locations[i], type, data);
}
}
}
}
}
/// <summary>
/// Helper; creates cached TS.
/// </summary>
private ManagedTypedStream GetCachedTypedStream(string t, OpenMode mode)
{
// First update all unused typed streams containers.
typedStreams.RemoveAll(delegate(TypedStreamContainer c) {
if (!c.IsAlive)
{
return(true);
}
return(false);
});
// Foreach stream.
foreach (TypedStreamContainer c in typedStreams)
{
if (c.Type == t)
{
ManagedTypedStream stream = c.Create(mode);
if (stream != null)
{
return(stream);
}
break;
}
}
// We have to create it.
// We ask node to provide TS.
IDriverTypedStream s = node.GetTypedStream(OpenMode.ReadWrite, t);
if (s == null)
{
return(null);
}
TypedStreamContainer cont = new TypedStreamContainer(t, s);
// We add it in front, to make sure we first check this new type.
typedStreams.Insert(0, cont);
return(cont.Create(mode));
}
public void AddTypedStream(Type t, StreamOptions flags)
{
lock (SyncRoot)
{
AssertNotDisposed();
AssertCurrentVersion();
// We first check that it does not exist.
ManagedTypedStream stream = GetCachedTypedStream(t.FullName, OpenMode.Read);
if (stream != null)
{
stream.Dispose();
throw new TypedStreamAlreadyExistsException("Typed stream " +
t.FullName + " already exists.");
}
// We can add it.
node.AddTypedStream(t.FullName, flags);
}
}
public ITypedStream OpenDefaultStream(OpenMode mode)
{
lock (SyncRoot)
{
AssertNotDisposed();
if (mode != OpenMode.Read)
{
AssertCurrentVersion();
}
if (node == null)
{
throw new TypedStreamNotFoundException("Default typed stream does " +
" not exist on transparent nodes.");
}
// We obtain the stream.
ManagedTypedStream stream = GetCachedTypedStream(node.DefaultType, mode);
return(stream);
}
}
public void ChangeDefaultStream(Type t)
{
lock (SyncRoot)
{
AssertNotDisposed();
AssertCurrentVersion();
// We make sure the typed stream is valid.
ManagedTypedStream ts = GetCachedTypedStream(t.FullName, OpenMode.Read);
if (ts == null)
{
throw new TypedStreamNotFoundException("The typed stream of type " +
t.FullName + " does not exist in this node.");
}
// We are not using it anymore.
ts.Dispose();
// Change it.
node.ChangeDefaultStream(t.FullName);
}
}
public void RemoveTypedStream(Type t)
{
lock (SyncRoot)
{
AssertNotDisposed();
AssertCurrentVersion();
// We first make sure it exists.
ManagedTypedStream stream = GetCachedTypedStream(t.FullName, OpenMode.Read);
if (stream == null)
{
throw new TypedStreamNotFoundException("Cannot remove unexisting typed stream.");
}
// We check it's usage, there must only one read stream opened.
TypedStreamContainer container = typedStreams.Find(
delegate(TypedStreamContainer c)
{
if (c.Type == t.FullName)
{
return(true);
}
return(false);
});
// We obtained the container, make sure only one stream is using it.
if (container.ReadCount != 1)
{
stream.Dispose();
throw new InvalidOperationException("Cannot delete typed stream in usage.");
}
// We must dispose it, invalidating the container.
stream.Dispose();
// We can delete it.
node.RemoveTypedStream(t.FullName);
}
}
