public PipelineEnvironment(PipelineConfiguration configuration, IServiceProvider serviceProvider = null)
{
if (configuration is null)
{
throw new ArgumentNullException(nameof(configuration));
}
Debug.WriteLineIf(serviceProvider is null, "no IServiceProvider is provided to the pipeline environment");
Pipeline = PsiPipeline.Create(configuration.Name, configuration.DeliveryPolicy);
var instEnvs = new List <ComponentEnvironment>();
Instances = instEnvs;
var pending = new List <ComponentConfiguration>(configuration.Instances);
while (true)
{
//find one with all dependencies ready
var compConfig = pending.Where(c => ReadyToInstantiate(c, instEnvs)).FirstOrDefault();
if (compConfig is null) //if not found
{
if (pending.Count > 0)
{
throw new Exception($"{pending.Count} components cannot be instantiated because their data flow dependencies are not fulfilled.");
}
break;
}
pending.Remove(compConfig);
var instance = compConfig.Instantiate(Pipeline, instEnvs, serviceProvider);
var env = new ComponentEnvironment(compConfig, instance);
instEnvs.Add(env);
}
}
public sealed override object Instantiate(PsiPipeline pipeline, IReadOnlyList <ComponentEnvironment> instantiatedComponents, IServiceProvider serviceProvider)
{
var instance = Instantiate(pipeline, serviceProvider);
Debug.Assert(GetMetadata().InputPorts().All(p => p is StaticPortMetadata));
this.ConnectAllStaticInputs(instance, instantiatedComponents);
return(instance);
}
/// <summary> /// This method is called to initialize an instance. After the instance is returned, connections of ports will be added. /// </summary> /// <param name="pipeline">The pipeline will be connected to.</param> /// <param name="serviceProvider">A <see cref="IServiceProvider"/> can be used as needed. Can be <see cref="null"/>.</param> /// <returns>An instance of the component initialized using the current configuration.</returns> protected abstract object Instantiate(PsiPipeline pipeline, IServiceProvider serviceProvider);
