You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.8 KiB
61 lines
1.8 KiB
= NodeJS -> services readmongo_service, dummy_service
|
|
|
|
== asynchronous event-driven
|
|
|
|
TIP: As an asynchronous event-driven JavaScript runtime, Node.js is designed to build scalable network applications.
|
|
|
|
Almost no function in Node.js directly performs I/O, so the process never blocks. Thanks to this, scalable systems is very reasonable to be developed in Node.js.
|
|
|
|
https://nodejs.org/en/docs/guides/blocking-vs-non-blocking/[Overview of Blocking vs Non-Blocking^]
|
|
|
|
TIP: *Node.js* is similar in design to, and influenced by, systems like *Ruby's Event Machine* and *Python's Twisted.*
|
|
|
|
Node.js takes the event model a bit further. It presents an *event loop as a runtime construct* instead of a library.
|
|
|
|
*In other systems, there is always a blocking call to start the event-loop.*
|
|
|
|
Typically,
|
|
|
|
- behavior is defined through callbacks at the beginning of a script,
|
|
|
|
- and at the end a server is started through a blocking call like *EventMachine::run().*
|
|
|
|
[NOTE]
|
|
====
|
|
In Node.js, there is no such start-the-event-loop call.
|
|
|
|
- *Node.js* simply *enters the event loop after executing the input script.*
|
|
|
|
- *Node.js exits the event loop* when there are *no more callbacks to perform.*
|
|
====
|
|
|
|
== threads
|
|
|
|
Node.js being *designed without threads* doesn't mean you can't take advantage of multiple cores in your environment.
|
|
|
|
Child processes can be spawned by using our *child_process.fork() API,* and are designed to be easy to communicate with.
|
|
|
|
TIP: Built upon that same interface is the cluster module, which *allows you to share sockets between processes* to enable load balancing over your cores.
|
|
|
|
|
|
== Video = intro
|
|
|
|
|
|
****
|
|
TIP: NodeJS in 10 Minutes and Netflix
|
|
|
|
video::2gQG4cFjahw[youtube]
|
|
|
|
video::CZ3wIuvmHeM[youtube]
|
|
****
|
|
|
|
netflix
|
|
|
|
* 6:50 monolithic
|
|
* 8:24 minroservices
|
|
* 19:00 microservice
|
|
* 37:00
|
|
|
|
https://netflix.github.io[Netflix on Github]
|
|
|
|
|
|
|