// Find the controller given the HAV (addIn), optionally also removing it.
// This code also removes any stale HAVControllerPairs that it finds, as
// may happen when a HAV is garbage collected.
private static AddInControllerImpl FindController(Object addIn, bool remove)
{
System.Diagnostics.Contracts.Contract.Requires(addIn != null);
lock (_havLock)
{
HAVControllerPair current = _havList;
HAVControllerPair last = null;
while (current != null)
{
Object o = current._HAV.Target;
if (o == null)
{
// this one has been GC'd. Clean up the WR
if (last == null)
{
_havList = current._next;
continue;
}
else
{
last._next = current._next;
current = current._next;
continue;
}
}
else
{
if (addIn.Equals(o))
{
AddInControllerImpl value = current._controller;
if (remove)
{
if (last == null)
{
_havList = current._next;
}
else
{
last._next = current._next;
}
}
return(value);
}
}
last = current;
current = current._next;
}
}
return(null);
}
// Requires the HAV and the transparent proxy to the add-in adapter,
// which implements System.AddIn.Contract.IContract.
internal void AssociateWithHostAddinView(Object hostAddinView, IContract contract)
{
System.Diagnostics.Contracts.Contract.Requires(hostAddinView != null);
_contract = contract;
// add weak reference on the HAV to our list
_havReference = new WeakReference(hostAddinView);
lock (_havLock)
{
HAVControllerPair havRef = new HAVControllerPair(hostAddinView, this);
havRef._next = _havList;
_havList = havRef;
// clean up the list every so often
_addInCountSinceLastPrune++;
if (_addInCountSinceLastPrune == AddInCountSinceLastPruneLimit)
{
// searching for a non-exiting addin will have the desired effect
// of pruning the list of any stale references.
FindController(new Object(), false);
_addInCountSinceLastPrune = 0;
}
}
}
// Requires the HAV and the transparent proxy to the add-in adapter,
// which implements System.AddIn.Contract.IContract.
internal void AssociateWithHostAddinView(Object hostAddinView, IContract contract)
{
System.Diagnostics.Contracts.Contract.Requires(hostAddinView != null);
_contract = contract;
// add weak reference on the HAV to our list
_havReference = new WeakReference(hostAddinView);
lock (_havLock)
{
HAVControllerPair havRef = new HAVControllerPair(hostAddinView, this);
havRef._next = _havList;
_havList = havRef;
// clean up the list every so often
_addInCountSinceLastPrune++;
if (_addInCountSinceLastPrune == AddInCountSinceLastPruneLimit)
{
// searching for a non-exiting addin will have the desired effect
// of pruning the list of any stale references.
FindController(new Object(), false);
_addInCountSinceLastPrune = 0;
}
}
}
// Find the controller given the HAV (addIn), optionally also removing it.
// This code also removes any stale HAVControllerPairs that it finds, as
// may happen when a HAV is garbage collected.
private static AddInControllerImpl FindController(Object addIn, bool remove)
{
System.Diagnostics.Contracts.Contract.Requires(addIn != null);
lock (_havLock)
{
HAVControllerPair current = _havList;
HAVControllerPair last = null;
while(current != null)
{
Object o = current._HAV.Target;
if (o == null)
{
// this one has been GC'd. Clean up the WR
if (last == null)
{
_havList = current._next;
continue;
}
else
{
last._next = current._next;
current = current._next;
continue;
}
}
else
{
if (addIn.Equals(o))
{
AddInControllerImpl value = current._controller;
if (remove)
{
if (last == null)
_havList = current._next;
else
last._next = current._next;
}
return value;
}
}
last = current;
current = current._next;
}
}
return null;
}
