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61 lines
1.8 KiB
61 lines
1.8 KiB
3 years ago
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= NodeJS -> services readmongo_service, dummy_service
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TIP: As an asynchronous event-driven JavaScript runtime, Node.js is designed to build scalable network applications.
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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.
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https://nodejs.org/en/docs/guides/blocking-vs-non-blocking/[Overview of Blocking vs Non-Blocking^]
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TIP: *Node.js* is similar in design to, and influenced by, systems like *Ruby's Event Machine* and *Python's Twisted.*
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Node.js takes the event model a bit further. It presents an *event loop as a runtime construct* instead of a library.
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*In other systems, there is always a blocking call to start the event-loop.*
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Typically,
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- behavior is defined through callbacks at the beginning of a script,
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- and at the end a server is started through a blocking call like *EventMachine::run().*
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[NOTE]
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====
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In Node.js, there is no such start-the-event-loop call.
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- *Node.js* simply *enters the event loop after executing the input script.*
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- *Node.js exits the event loop* when there are *no more callbacks to perform.*
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====
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Node.js being *designed without threads* doesn't mean you can't take advantage of multiple cores in your environment.
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Child processes can be spawned by using our *child_process.fork() API,* and are designed to be easy to communicate with.
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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.
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=== Video = intro
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****
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TIP: NodeJS in 10 Minutes and Netflix
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video::2gQG4cFjahw[youtube]
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video::CZ3wIuvmHeM[youtube]
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****
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netflix
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* 6:50 monolithic
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* 8:24 minroservices
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* 19:00 microservice
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* 37:00
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https://netflix.github.io[Netflix on Github]
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