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Sources/Nats/NatsClient/NatsClient+Events.swift

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+// Copyright 2024 The NATS Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Foundation
+
+extension NatsClient {
+
+    /// Registers a callback for given event types.
+    ///
+    /// - Parameters:
+    ///   - events: an array of ``NatsEventKind`` for which the handler will be invoked.
+    ///   - handler: a callback invoked upon triggering a specific event.
+    ///
+    /// - Returns an ID of the registered listener which can be used to disable it.
+    @discardableResult
+    public func on(_ events: [NatsEventKind], _ handler: @escaping (NatsEvent) -> Void) -> String {
+        guard let connectionHandler = self.connectionHandler else {
+            return ""
+        }
+        return connectionHandler.addListeners(for: events, using: handler)
+    }
+
+    /// Registers a callback for given event type.
+    ///
+    /// - Parameters:
+    ///   - events: a ``NatsEventKind`` for which the handler will be invoked.
+    ///   - handler: a callback invoked upon triggering a specific event.
+    ///
+    /// - Returns an ID of the registered listener which can be used to disable it.
+    @discardableResult
+    public func on(_ event: NatsEventKind, _ handler: @escaping (NatsEvent) -> Void) -> String {
+        guard let connectionHandler = self.connectionHandler else {
+            return ""
+        }
+        return connectionHandler.addListeners(for: [event], using: handler)
+    }
+
+    /// Disables the event listener.
+    ///
+    /// - Parameter id: an ID of a listener to be disabled (returned when creating it).
+    public func off(_ id: String) {
+        guard let connectionHandler = self.connectionHandler else {
+            return
+        }
+        connectionHandler.removeListener(id)
+    }
+}