public async Task UpdateAsync(CilCompilation compilation, CancellationToken token)
{
try
{
var results = new List <NodePlugin.BuildResult>(FInstances.Length);
foreach (var instance in FInstances)
{
var buildResult = await Task.Run(() => instance.Update(compilation), token);
results.Add(buildResult);
}
token.ThrowIfCancellationRequested();
using (var swapper = new HotSwapper(Compilation, compilation, token))
{
foreach (var result in results)
{
var instance = result.Plugin;
if (!instance.IsDisposed) // It could be that the node has already been deleted
{
instance.SyncPinsAndRestoreState(result, swapper);
}
}
ImplicitEntryPointInstanceManager.Update(swapper);
Compilation = compilation;
}
}
catch (OperationCanceledException)
{
// Fine
}
catch (Exception e)
{
LogAndStop(e);
}
}
// Called sequentially for all VL plugins on main thread
public void SyncPinsAndRestoreState(BuildResult buildResult, HotSwapper swapper)
{
if (buildResult == FBuildResult)
{
return; // Same build result, nothing to do
}
if (buildResult == null)
{
return; // Something went seriously wrong during compile phase
}
if (buildResult.ClrMethodToCall == null)
{
FBuildResult = buildResult;
return; // Something went wrong during compile phase
}
if (buildResult.Compilation.Age < FBuildResult.Compilation?.Age)
{
return; // Dismiss outdated builds
}
if (buildResult.ClrMethodToCall == FBuildResult.ClrMethodToCall)
{
// Same CLR method, nothing to do except for remember the new result
// Holding on to the old would introduce a memory leak as old solutions and compilation could not get garbage collected
FBuildResult = buildResult;
return;
}
try
{
// Synchronize pins
SyncPins(buildResult);
// Restore the state
if (FInstances.Length > 0)
{
var instanceType = buildResult.InstanceType;
using (var reader = FInstances.GetReader())
using (var writer = FInstances.GetWriter())
{
while (!reader.Eos)
{
var oldInstance = reader.Read();
if (oldInstance != null)
{
var newInstance = swapper.Swap(oldInstance, buildResult.Scope, buildResult.Factory);
writer.Write(newInstance);
}
else
{
var newInstance = instanceType != null?buildResult.Factory.CreateInstance(instanceType, FInstanceId) : null;
writer.Write(newInstance);
}
}
}
}
}
catch (Exception exception)
{
LogException(exception);
throw;
}
finally
{
FBuildResult = buildResult;
}
}