/// <summary>
/// Create event subscription.
/// </summary>
/// <param name="connection">native connection pointer</param>
/// <param name="eventType">type of event to create</param>
/// <param name="eventSubscriptionFlags">event subscription flags</param>
/// <param name="listener">event listener</param>
/// <exception cref="ArgumentException">One of passed parameters is not valid.</exception>
/// <exception cref="DxException"></exception>
public NativeSubscription(NativeConnection connection, EventType eventType, EventSubscriptionFlag eventSubscriptionFlags, IDxEventListener listener)
{
if (listener == null)
{
throw new ArgumentNullException(nameof(listener));
}
connectionPtr = connection.Handler;
this.eventType = eventType;
eventListener = listener;
C.CheckOk(eventSubscriptionFlags == EventSubscriptionFlag.Default
? C.Instance.dxf_create_subscription(connectionPtr, eventType, out subscriptionPtr)
: C.Instance.dxf_create_subscription_with_flags(connectionPtr, eventType, eventSubscriptionFlags,
out subscriptionPtr));
try
{
C.CheckOk(C.Instance.dxf_attach_event_listener_v2(subscriptionPtr, callback = OnEvent, IntPtr.Zero));
}
catch (DxException)
{
C.Instance.dxf_close_subscription(subscriptionPtr);
throw;
}
this.connection = connection;
}
/// <summary>
/// Create Candle event subscription.
/// For rest events use another constructor.
/// </summary>
/// <param name="connection">Native connection pointer.</param>
/// <param name="time">Date time in the past.</param>
/// <param name="eventSubscriptionFlags">event subscription flags</param>
/// <param name="listener">Candle event listener.</param>
/// <exception cref="ArgumentException">One of passed parameters is not valid.</exception>
/// <exception cref="DxException"></exception>
public NativeSubscription(NativeConnection connection, DateTime?time, EventSubscriptionFlag eventSubscriptionFlags, IDxCandleListener listener)
{
if (listener == null)
{
throw new ArgumentNullException(nameof(listener));
}
connectionPtr = connection.Handler;
eventType = EventType.Candle;
eventListener = listener;
var unixTimestamp = time == null ? 0 : Tools.DateToUnixTime((DateTime)time);
C.CheckOk(eventSubscriptionFlags == EventSubscriptionFlag.Default
? C.Instance.dxf_create_subscription_timed(connectionPtr, eventType, unixTimestamp, out subscriptionPtr)
: C.Instance.dxf_create_subscription_timed_with_flags(connectionPtr, eventType, unixTimestamp,
eventSubscriptionFlags, out subscriptionPtr));
try
{
C.CheckOk(C.Instance.dxf_attach_event_listener_v2(subscriptionPtr, callback = OnEvent, IntPtr.Zero));
}
catch (DxException)
{
C.Instance.dxf_close_subscription(subscriptionPtr);
throw;
}
}
/// <summary>
/// Creates an event subscription.
/// </summary>
/// <remarks>
/// Don't call this method inside any listeners and callbacks of NativeSubscription, NativeConnection,
/// NativeRegionalBook, NativeSnapshotSubscription classes
/// </remarks>
/// <param name="type">Event type.</param>
/// <param name="eventSubscriptionFlags">Event subscription flags</param>
/// <param name="listener">Event listener callback.</param>
/// <returns>Subscription object.</returns>
/// <exception cref="ArgumentNullException">Listener is null.</exception>
/// <exception cref="DxException"></exception>
public IDxSubscription CreateSubscription(EventType type, EventSubscriptionFlag eventSubscriptionFlags, IDxEventListener listener)
{
if (handle == IntPtr.Zero)
{
throw new NativeDxException("not connected");
}
IDxSubscription result = new NativeSubscription(this, type, eventSubscriptionFlags, listener);
subscriptions.Add(result);
return(result);
}
internal override int dxf_create_subscription_timed_with_flags(IntPtr connection, EventType event_types, Int64 time, EventSubscriptionFlag subscr_flags, out IntPtr subscription)
{
return(__dxf_create_subscription_timed_with_flags(connection, event_types, time, subscr_flags, out subscription));
}
private static extern int __dxf_create_subscription_timed_with_flags(IntPtr connection, EventType event_types, Int64 time, EventSubscriptionFlag subscr_flags, out IntPtr subscription);
/// <summary>
/// Create time event subscription.
/// </summary>
/// <param name="connection">Native connection pointer.</param>
/// <param name="eventType">Type of event to create.</param>
/// <param name="time">Time to getting events from.</param>
/// <param name="eventSubscriptionFlags">event subscription flags</param>
/// <param name="listener">Event listener.</param>
/// <exception cref="ArgumentException">One of passed parameters is not valid.</exception>
/// <exception cref="DxException"></exception>
public NativeSubscription(NativeConnection connection, EventType eventType, DateTime time, EventSubscriptionFlag eventSubscriptionFlags, IDxEventListener listener) :
this(connection, eventType, Tools.DateToUnixTime(time), eventSubscriptionFlags, listener)
{
}
/// <summary>
/// Creates a timed subscription with the specified parameters and the subscription flags.
/// </summary>
/// <param name="connection">A handle of a previously created connection which the subscription will be using</param>
/// <param name="event_types">A bitmask of the subscription event types. See: EventType</param>
/// <param name="time">UTC time in the past (unix time in milliseconds)</param>
/// <param name="subscr_flags">A bitmask of the subscription event flags. See: EventSubscriptionFlag</param>
/// <param name="subscription">A handle of the created subscription</param>
/// <returns>DX_OK (1) on successful subscription creation or DX_ERR (0) on error;
/// dxf_get_last_error can be used to retrieve the error code and description in case of failure; a handle to
/// newly created subscription is returned via ```subscription``` out parameter</returns>
internal abstract int dxf_create_subscription_timed_with_flags(IntPtr connection, EventType event_types,
Int64 time, EventSubscriptionFlag subscr_flags, out IntPtr subscription);
