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2 Building Real-time Data in Web Applications with Node.js Dan McGhan Oracle Developer Advocate JavaScript and HTML5 March, 2017 Copyright 2017, Oracle and/or its affiliates. All rights reserved.

3 Safe Harbor Statement The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle s products remains at the sole discretion of Oracle. Copyright 2017, Oracle and/or its affiliates. All rights reserved. 3

4 Who are you? Copyright 2017, Oracle and/or its affiliates. All rights reserved. 4

5 About me Dan McGhan Oracle Developer Advocate Focus on JavaScript and HTML5 Contact jsao.io Copyright 2017, Oracle and/or its affiliates. All rights reserved. 5

6 Agenda How we got here Where we re at Mixing in the database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 6

7 Demo time! Copyright 2017, Oracle and/or its affiliates. All rights reserved. 7

8 Agenda How we got here Where we re at Mixing in the database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 8

9 Web Browser Web Server Copyright 2017, Oracle and/or its affiliates. All rights reserved. 9

10 HTTP request Web Browser Web Server Copyright 2017, Oracle and/or its affiliates. All rights reserved. 10

11 HTTP response Web Browser Web Server Copyright 2017, Oracle and/or its affiliates. All rights reserved. 11

12 Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 12

13 HTTP request Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 13

14 DB driver request Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 14

15 DB driver response Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 15

16 HTTP response Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 16

17 Transactions Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 17

18 Sharding Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 18

19 Auto-Scaling Sharding Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 19

20 Lots O Users Auto-Scaling Sharding Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 20

21 Lots O Users Auto-Scaling Sharding Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 21

22 Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 22

23 What about subsequent DB changes? Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 23

24 HTTP request Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 24

25 HTTP request Web Browser Web Server Database Not possible for good reasons Copyright 2017, Oracle and/or its affiliates. All rights reserved. 25

26 Thus began the quest to simulate pushing data Copyright 2017, Oracle and/or its affiliates. All rights reserved.

27 Techniques to bridge the gap Forever frame Ajax polling Ajax long polling HTML5 Server Sent Events Copyright 2017, Oracle and/or its affiliates. All rights reserved. 27

28 Agenda How we got here Where we re at Mixing in the database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 28

29 New technologies have emerged WebSocket Allows bi-directional communication Starts with HTTP(S) and then upgrades to WebSocket Great for servers to push to clients WebRTC Enables direct, peer-to-peer connections over the web No middle-man greatly reduces latency Requires a TURN server to get clients connected directly Great for Streaming audio/video Communicating arbitrary data (think games) Copyright 2017, Oracle and/or its affiliates. All rights reserved. 29

30 Current WebRTC support Copyright 2017, Oracle and/or its affiliates. All rights reserved. 30

31 Current WebSocket support Copyright 2017, Oracle and/or its affiliates. All rights reserved. 31

32 WebSocket example Copyright 2017, Oracle and/or its affiliates. All rights reserved. 32

33 Socket.IO 2 parts: client-side and server-side Starts with long-polling, upgrades to WebSocket if possible Simple API with great features Multiplexing/namespacingsupport (separate channels over the same connection) Rooms (group users within a namespace) Auto-reconnect Copyright 2017, Oracle and/or its affiliates. All rights reserved. 33

34 Code review Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 34

35 Agenda How we got here Where were at Mixing in the database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 35

36 Events Database Communication Copyright 2017, Oracle and/or its affiliates. All rights reserved. 36

37 Triggers Events Database Communication Copyright 2017, Oracle and/or its affiliates. All rights reserved. 37

38 Triggers: 2 main types DML Triggers BEFORE INSERT AFTER UPDATE INSTEAD OF DELETE (for views) System Triggers AFTER LOGON BEFORE DROP Copyright 2017, Oracle and/or its affiliates. All rights reserved. 38

39 I could have used an insert trigger Copyright 2017, Oracle and/or its affiliates. All rights reserved. 39

40 I could have used an insert trigger but that would be bad. Copyright 2017, Oracle and/or its affiliates. All rights reserved. 40

41 Triggers Scheduler Events Database Communication Copyright 2017, Oracle and/or its affiliates. All rights reserved. 41

42 DBMS_SCHEDULER A robust scheduling tool Copyright 2017, Oracle and/or its affiliates. All rights reserved. 42

43 I could have used an insert trigger w/scheduler Copyright 2017, Oracle and/or its affiliates. All rights reserved. 43

44 Triggers Scheduler Events Advanced Queuing (AQ) w/notification Database Communication Copyright 2017, Oracle and/or its affiliates. All rights reserved. 44

45 Advanced Queuing A durable, scalable queuing framework in the database Has an enqueue notification feature to avoid polling Point-to-point messaging Publish/Subscribe mode Copyright 2017, Oracle and/or its affiliates. All rights reserved. 45

46 Triggers Scheduler Events Advanced Queuing (AQ) w/notification Continuous Query Notification Database Communication Copyright 2017, Oracle and/or its affiliates. All rights reserved. 46

47 Continuous Query Notification Copyright 2017, Oracle and/or its affiliates. All rights reserved. 47

48 Triggers Scheduler Events Advanced Queuing (AQ) w/notification Continuous Query Notification Database Communication UTL_TCP UTL_HTTP UTL_SMTP & UTL_MAIL Copyright 2017, Oracle and/or its affiliates. All rights reserved. 48

49 Triggers Scheduler Events Advanced Queuing (AQ) w/notification Continuous Query Notification Database Communication UTL_TCP UTL_HTTP UTL_SMTP & UTL_MAIL APEX_WEB_SERVICE Copyright 2017, Oracle and/or its affiliates. All rights reserved. 49

50 APEX_WEB_SERVICE An API provided by Application Express Copyright 2017, Oracle and/or its affiliates. All rights reserved. 50

51 Code review Web Browser Web Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 51

52 Triggers Scheduler Events Advanced Queuing (AQ) w/notification Continuous Query Notification Database Communication UTL_TCP UTL_HTTP UTL_SMTP & UTL_MAIL APEX_WEB_SERVICE Native Driver Support Copyright 2017, Oracle and/or its affiliates. All rights reserved. 52

53 What the future could look like Copyright 2017, Oracle and/or its affiliates. All rights reserved.

54 Next steps: learn and code! Web Browser Web Server Database Oracle JET Socket.IO (client) Node.js Socket.IO (server) Triggers Scheduler Advanced Queuing Users guide DBMS_AQ DBMS_AQADM Types Continuous Query Notification Users guide Types APEX_WEB_SERVICE Copyright 2017, Oracle and/or its affiliates. All rights reserved. 54

55

56 Web Browser App Server Database Copyright 2017, Oracle and/or its affiliates. All rights reserved. 56

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