A channel that can be used for inter-process communication, implemented in terms of LISTEN and NOTIFY. All instances start life as a Channel[F, String, Notification] but can be mapped out to different input and output types. See the linked documentation for more information on the transactional semantics of these operations.
Attributes
- See also
- Companion
- object
- Source
- Channel.scala
- Graph
-
- Supertypes
- Self type
-
Members list
Grouped members
Notifications
Construct a Stream that subscribes to notifications for this Channel, emits any notifications that arrive (this can happen at any time), then unsubscribes when the stream is terminated.
Construct a Stream that subscribes to notifications for this Channel, emits any notifications that arrive (this can happen at any time), then unsubscribes when the stream is terminated. Note that once such a stream is started it is important to consume all notifications as quickly as possible to avoid blocking message processing for other operations on the Session (although typically a dedicated Session will receive channel notifications so this won't be an issue).
Value parameters
- maxQueued
-
the maximum number of notifications to hold in a queue before [semantically] blocking message exchange on the controlling
Session.
Attributes
- See also
- Source
- Channel.scala
Construct a Resource[F, Stream] that subscribes to notifications for this Channel that emits any notifications that arrive (this can happen at any time) once resource is acquired and unsubscribes when the resource is released.
Construct a Resource[F, Stream] that subscribes to notifications for this Channel that emits any notifications that arrive (this can happen at any time) once resource is acquired and unsubscribes when the resource is released. Note that once such a stream is started it is important to consume all notifications as quickly as possible to avoid blocking message processing for other operations on the Session (although typically a dedicated Session will receive channel notifications so this won't be an issue).
Value parameters
- maxQueued
-
the maximum number of notifications to hold in a queue before [semantically] blocking message exchange on the controlling
Session.
Attributes
- See also
- Source
- Channel.scala
Send a notification on the given channel.
Send a notification on the given channel. Note that if the session is in an active transaction the notification will only be sent if the transaction is committed. See the linked documentation for more information.
Attributes
- See also
- Source
- Channel.scala
Transformations
Contramap messages from a new type C, yielding an Channel[D, C, B].
Contramap inputs from a new type C and map outputs to a new type D, yielding a Channel[F, C, D].
Contramap inputs from a new type C and map outputs to a new type D, yielding a Channel[F, C, D].
Attributes
- Source
- Channel.scala
Map notifications to a new type D, yielding an Channel[D, A, D].
Transform this Channel by a given FunctionK.