/// <summary>
/// Subscribes to the pub/sub-system and creates a new <see cref="Subscription"/>
/// instance representing that subscriptions.
/// </summary>
/// <param name="operationContextPool">
/// The operation context pool to rent context pools for execution.
/// </param>
/// <param name="queryExecutor">
/// The query executor to process event payloads.
/// </param>
/// <param name="requestContext">
/// The original request context.
/// </param>
/// <param name="subscriptionType">
/// The object type that represents the subscription.
/// </param>
/// <param name="rootSelections">
/// The operation selection set.
/// </param>
/// <param name="resolveQueryRootValue">
/// A delegate to resolve the subscription instance.
/// </param>
/// <param name="diagnosticsEvents">
/// The internal diagnostic events to report telemetry.
/// </param>
/// <returns>
/// Returns a new subscription instance.
/// </returns>
public static async ValueTask <Subscription> SubscribeAsync(
ObjectPool <OperationContext> operationContextPool,
QueryExecutor queryExecutor,
IRequestContext requestContext,
ObjectType subscriptionType,
ISelectionSet rootSelections,
Func <object?> resolveQueryRootValue,
IDiagnosticEvents diagnosticsEvents)
{
var subscription = new Subscription(
operationContextPool,
queryExecutor,
requestContext,
subscriptionType,
rootSelections,
resolveQueryRootValue,
diagnosticsEvents);
subscription._subscriptionScope =
diagnosticsEvents.ExecuteSubscription(subscription);
subscription._sourceStream =
await subscription.SubscribeAsync().ConfigureAwait(false);
return(subscription);
}
public SubscriptionExecutor(
ObjectPool <OperationContext> operationContextPool,
QueryExecutor queryExecutor,
IExecutionDiagnosticEvents diagnosticEvents)
{
_operationContextPool = operationContextPool;
_queryExecutor = queryExecutor;
_diagnosticEvents = diagnosticEvents;
}
private Subscription(
ObjectPool <OperationContext> operationContextPool,
QueryExecutor queryExecutor,
IRequestContext requestContext,
ObjectType subscriptionType,
ISelectionSet rootSelections,
IDiagnosticEvents diagnosticEvents)
{
_operationContextPool = operationContextPool;
_queryExecutor = queryExecutor;
_requestContext = requestContext;
_subscriptionType = subscriptionType;
_rootSelections = rootSelections;
_diagnosticEvents = diagnosticEvents;
}
public static async ValueTask <Subscription> SubscribeAsync(
ObjectPool <OperationContext> operationContextPool,
QueryExecutor queryExecutor,
IRequestContext requestContext,
ObjectType subscriptionType,
ISelectionSet rootSelections,
IDiagnosticEvents diagnosicEvents)
{
var subscription = new Subscription(
operationContextPool,
queryExecutor,
requestContext,
subscriptionType,
rootSelections,
diagnosicEvents);
subscription._sourceStream = await subscription.SubscribeAsync();
return(subscription);
}
private Subscription(
ObjectPool <OperationContext> operationContextPool,
QueryExecutor queryExecutor,
IRequestContext requestContext,
ObjectType subscriptionType,
ISelectionSet rootSelections,
Func <object?> resolveQueryRootValue,
IDiagnosticEvents diagnosticEvents)
{
unchecked
{
_id++;
}
_operationContextPool = operationContextPool;
_queryExecutor = queryExecutor;
_requestContext = requestContext;
_subscriptionType = subscriptionType;
_rootSelections = rootSelections;
_resolveQueryRootValue = resolveQueryRootValue;
_diagnosticEvents = diagnosticEvents;
}