forked from yorkie-team/yorkie
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Extract MemPubSub from PubSub (yorkie-team#141)
Before implementing the distributed PubSub implementation using ETCD, we need to extract the temporarily implemented MemoryPubSub and leave only the high-level abstraction logic in PubSub.
- Loading branch information
1 parent
0b97a53
commit 1a2ccef
Showing
4 changed files
with
197 additions
and
152 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| /* | ||
| * Copyright 2020 The Yorkie Authors. All rights reserved. | ||
| * | ||
| * 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 mempubsub | ||
|
|
||
| import ( | ||
| "sync" | ||
|
|
||
| "github.com/yorkie-team/yorkie/pkg/document/time" | ||
| "github.com/yorkie-team/yorkie/pkg/log" | ||
| "github.com/yorkie-team/yorkie/pkg/types" | ||
| "github.com/yorkie-team/yorkie/yorkie/backend/pubsub" | ||
| ) | ||
|
|
||
| // subscriptions is a collection of subscriptions that subscribe to a specific | ||
| // topic. | ||
| type subscriptions struct { | ||
| internalMap map[string]*pubsub.Subscription | ||
| } | ||
|
|
||
| func newSubscriptions() *subscriptions { | ||
| return &subscriptions{ | ||
| internalMap: make(map[string]*pubsub.Subscription), | ||
| } | ||
| } | ||
|
|
||
| // Add adds the given subscription. | ||
| func (s *subscriptions) Add(sub *pubsub.Subscription) { | ||
| s.internalMap[sub.ID()] = sub | ||
| } | ||
|
|
||
| // Map returns the internal map of this subscriptions. | ||
| func (s *subscriptions) Map() map[string]*pubsub.Subscription { | ||
| return s.internalMap | ||
| } | ||
|
|
||
| // Delete deletes the subscription of the given id. | ||
| func (s *subscriptions) Delete(id string) { | ||
| if subscription, ok := s.internalMap[id]; ok { | ||
| subscription.Close() | ||
| } | ||
| delete(s.internalMap, id) | ||
| } | ||
|
|
||
| // MemPubSub is the memory implementation of MemPubSub, used for single agent or | ||
| // tests. | ||
| type MemPubSub struct { | ||
| mu *sync.RWMutex | ||
| subscriptionsMap map[string]*subscriptions | ||
| } | ||
|
|
||
| // New creates an instance of MemoryPubSub. | ||
| func New() *MemPubSub { | ||
| return &MemPubSub{ | ||
| mu: &sync.RWMutex{}, | ||
| subscriptionsMap: make(map[string]*subscriptions), | ||
| } | ||
| } | ||
|
|
||
| // Subscribe subscribes to the given topics. | ||
| func (m *MemPubSub) Subscribe( | ||
| subscriber types.Client, | ||
| topics []string, | ||
| ) (*pubsub.Subscription, map[string][]types.Client, error) { | ||
| if len(topics) == 0 { | ||
| return nil, nil, pubsub.ErrEmptyTopics | ||
| } | ||
|
|
||
| m.mu.Lock() | ||
| defer m.mu.Unlock() | ||
|
|
||
| log.Logger.Debugf( | ||
| `Subscribe(%s,%s) Start`, | ||
| topics[0], | ||
| subscriber.ID.String(), | ||
| ) | ||
|
|
||
| sub := pubsub.NewSubscription(subscriber) | ||
| peersMap := make(map[string][]types.Client) | ||
|
|
||
| for _, topic := range topics { | ||
| if _, ok := m.subscriptionsMap[topic]; !ok { | ||
| m.subscriptionsMap[topic] = newSubscriptions() | ||
| } | ||
| m.subscriptionsMap[topic].Add(sub) | ||
|
|
||
| var peers []types.Client | ||
| for _, sub := range m.subscriptionsMap[topic].Map() { | ||
| peers = append(peers, sub.Subscriber()) | ||
| } | ||
| peersMap[topic] = peers | ||
| } | ||
|
|
||
| log.Logger.Debugf( | ||
| `Subscribe(%s,%s) End`, | ||
| topics[0], | ||
| subscriber.ID.String(), | ||
| ) | ||
| return sub, peersMap, nil | ||
| } | ||
|
|
||
| // Unsubscribe unsubscribes the given topics. | ||
| func (m *MemPubSub) Unsubscribe(topics []string, sub *pubsub.Subscription) { | ||
| m.mu.Lock() | ||
| defer m.mu.Unlock() | ||
|
|
||
| log.Logger.Debugf(`Unsubscribe(%s,%s) Start`, topics[0], sub.SubscriberID()) | ||
|
|
||
| for _, topic := range topics { | ||
| if subs, ok := m.subscriptionsMap[topic]; ok { | ||
| subs.Delete(sub.ID()) | ||
| } | ||
| } | ||
| log.Logger.Debugf(`Unsubscribe(%s,%s) End`, topics[0], sub.SubscriberID()) | ||
| } | ||
|
|
||
| // Publish publishes the given event to the given Topic. | ||
| func (m *MemPubSub) Publish( | ||
| publisherID *time.ActorID, | ||
| topic string, | ||
| event pubsub.DocEvent, | ||
| ) { | ||
| m.mu.RLock() | ||
| defer m.mu.RUnlock() | ||
|
|
||
| log.Logger.Debugf(`Publish(%s,%s) Start`, event.DocKey, publisherID.String()) | ||
|
|
||
| if subs, ok := m.subscriptionsMap[topic]; ok { | ||
| for _, sub := range subs.Map() { | ||
| if sub.Subscriber().ID.Compare(publisherID) != 0 { | ||
| log.Logger.Debugf( | ||
| `Publish(%s,%s) to %s`, | ||
| event.DocKey, | ||
| publisherID.String(), | ||
| sub.SubscriberID(), | ||
| ) | ||
| sub.Events() <- event | ||
| } | ||
| } | ||
| } | ||
|
|
||
| log.Logger.Debugf(`Publish(%s,%s) End`, event.DocKey, publisherID.String()) | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.