#3 added logic to fetch topic collection by name or ID

internal/client/common/topic_collection.go

@@ -0,0 +1,82 @@
+package common
+
+import (
+	"errors"
+	"sync"
+)
+
+// TopicCollection represents a collection of topics defined by name or ID.
+type TopicCollection interface {
+	TopicIds() []Uuid
+	TopicNames() []string
+}
+
+// TopicIdCollection represents a collection of topics defined by their topic ID.
+type TopicIdCollection struct {
+	topicIds []Uuid
+	mu       sync.RWMutex
+}
+
+// NewTopicIdCollection creates a new TopicIdCollection with the given topic IDs.
+func NewTopicIdCollection(topicIds []Uuid) *TopicIdCollection {
+	return &TopicIdCollection{
+		topicIds: append([]Uuid{}, topicIds...), // Create a copy to prevent external modifications
+	}
+}
+
+// TopicIds returns a read-only slice of topic IDs.
+func (c *TopicIdCollection) TopicIds() []Uuid {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return append([]Uuid{}, c.topicIds...) // Return a copy to ensure immutability
+}
+
+// TopicNameCollection represents a collection of topics defined by their topic name.
+type TopicNameCollection struct {
+	topicNames []string
+	mu         sync.RWMutex
+}
+
+// NewTopicNameCollection creates a new TopicNameCollection with the given topic names.
+func NewTopicNameCollection(topicNames []string) *TopicNameCollection {
+	return &TopicNameCollection{
+		topicNames: append([]string{}, topicNames...), // Create a copy to prevent external modifications
+	}
+}
+
+// TopicNames returns a read-only slice of topic names.
+func (c *TopicNameCollection) TopicNames() []string {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return append([]string{}, c.topicNames...) // Return a copy to ensure immutability
+}
+
+// NewTopic creates a new topic with the given ID and name.
+func NewTopic(id Uuid, name string) (*Topic, error) {
+	if id.Compare(ZeroUUID) == 0 {
+		return nil, errors.New("topic ID cannot be empty")
+	}
+	if name == "" {
+		return nil, errors.New("topic name cannot be empty")
+	}
+	return &Topic{
+		id:   id,
+		name: name,
+	}, nil
+}
+
+// Topic represents a single topic with an ID and name.
+type Topic struct {
+	id   Uuid
+	name string
+}
+
+// ID returns the topic ID.
+func (t *Topic) ID() Uuid {
+	return t.id
+}
+
+// Name returns the topic name.
+func (t *Topic) Name() string {
+	return t.name
+}