[VOL-5486] Fix deprecated versions
Change-Id: I3e03ea246020547ae75fa92ce8cf5cbba7e8f3bb
Signed-off-by: Abhay Kumar <abhay.kumar@radisys.com>
diff --git a/vendor/google.golang.org/grpc/internal/grpcsync/pubsub.go b/vendor/google.golang.org/grpc/internal/grpcsync/pubsub.go
new file mode 100644
index 0000000..6d8c2f5
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/grpcsync/pubsub.go
@@ -0,0 +1,121 @@
+/*
+ *
+ * Copyright 2023 gRPC 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.
+ *
+ */
+
+package grpcsync
+
+import (
+ "context"
+ "sync"
+)
+
+// Subscriber represents an entity that is subscribed to messages published on
+// a PubSub. It wraps the callback to be invoked by the PubSub when a new
+// message is published.
+type Subscriber interface {
+ // OnMessage is invoked when a new message is published. Implementations
+ // must not block in this method.
+ OnMessage(msg any)
+}
+
+// PubSub is a simple one-to-many publish-subscribe system that supports
+// messages of arbitrary type. It guarantees that messages are delivered in
+// the same order in which they were published.
+//
+// Publisher invokes the Publish() method to publish new messages, while
+// subscribers interested in receiving these messages register a callback
+// via the Subscribe() method.
+//
+// Once a PubSub is stopped, no more messages can be published, but any pending
+// published messages will be delivered to the subscribers. Done may be used
+// to determine when all published messages have been delivered.
+type PubSub struct {
+ cs *CallbackSerializer
+
+ // Access to the below fields are guarded by this mutex.
+ mu sync.Mutex
+ msg any
+ subscribers map[Subscriber]bool
+}
+
+// NewPubSub returns a new PubSub instance. Users should cancel the
+// provided context to shutdown the PubSub.
+func NewPubSub(ctx context.Context) *PubSub {
+ return &PubSub{
+ cs: NewCallbackSerializer(ctx),
+ subscribers: map[Subscriber]bool{},
+ }
+}
+
+// Subscribe registers the provided Subscriber to the PubSub.
+//
+// If the PubSub contains a previously published message, the Subscriber's
+// OnMessage() callback will be invoked asynchronously with the existing
+// message to begin with, and subsequently for every newly published message.
+//
+// The caller is responsible for invoking the returned cancel function to
+// unsubscribe itself from the PubSub.
+func (ps *PubSub) Subscribe(sub Subscriber) (cancel func()) {
+ ps.mu.Lock()
+ defer ps.mu.Unlock()
+
+ ps.subscribers[sub] = true
+
+ if ps.msg != nil {
+ msg := ps.msg
+ ps.cs.TrySchedule(func(context.Context) {
+ ps.mu.Lock()
+ defer ps.mu.Unlock()
+ if !ps.subscribers[sub] {
+ return
+ }
+ sub.OnMessage(msg)
+ })
+ }
+
+ return func() {
+ ps.mu.Lock()
+ defer ps.mu.Unlock()
+ delete(ps.subscribers, sub)
+ }
+}
+
+// Publish publishes the provided message to the PubSub, and invokes
+// callbacks registered by subscribers asynchronously.
+func (ps *PubSub) Publish(msg any) {
+ ps.mu.Lock()
+ defer ps.mu.Unlock()
+
+ ps.msg = msg
+ for sub := range ps.subscribers {
+ s := sub
+ ps.cs.TrySchedule(func(context.Context) {
+ ps.mu.Lock()
+ defer ps.mu.Unlock()
+ if !ps.subscribers[s] {
+ return
+ }
+ s.OnMessage(msg)
+ })
+ }
+}
+
+// Done returns a channel that is closed after the context passed to NewPubSub
+// is canceled and all updates have been sent to subscribers.
+func (ps *PubSub) Done() <-chan struct{} {
+ return ps.cs.Done()
+}