WebFund 2014W Lecture 18: Difference between revisions
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The video from the lecture given on March 19, 2014 is available: | |||
* [http://www.screencast.com/t/p4S3RPyl Small from screencast.com] | |||
* [http://www.screencast.com/t/z2SXj16DLx Large from screencast.com] | |||
* [http://dl.cuol.ca/capture/Anil.Somayaji/COMP_2406_2014W_Lecture_18_-_20140319_211725_27.mp4 Original from CUOL] | |||
==invoke versus call== | |||
* SAME THING | |||
==Reactor pattern== | ==Reactor pattern== | ||
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** exception: event handlers | ** exception: event handlers | ||
** dispatcher calls event handlers | ** dispatcher calls event handlers | ||
* type of event-driven programming | |||
** event dispatcher is implicit | |||
** implicit "assembly line" | |||
** raw data comes in, dispatcher has routine(s) that match raw data | |||
** routine process it, leaves processed data | |||
** processed data matches other routines | |||
* normal events are incoming I/O events | |||
** keypresses, mouse clicks, network traffic | |||
* node makes use of synthetic events | |||
** generated by other code | |||
==multitasking== | |||
* node is "cooperatively multitasked" | |||
* multithreaded code is preemptively multitasked | |||
* sane multithreading involves locking | |||
** temporary exclusive ownership | |||
** mistakes lead to race conditions | |||
* node avoids race conditions while being highly concurrent | |||
** node is fast | |||
Latest revision as of 02:47, 21 March 2014
The video from the lecture given on March 19, 2014 is available:
invoke versus call
- SAME THING
Reactor pattern
- direct contrast to a procedural pattern
- procedural: everything is synchronous
- each line completes before the next executes
- reactor pattern: mostly synchronous
- exception: event handlers
- dispatcher calls event handlers
- type of event-driven programming
- event dispatcher is implicit
- implicit "assembly line"
- raw data comes in, dispatcher has routine(s) that match raw data
- routine process it, leaves processed data
- processed data matches other routines
- normal events are incoming I/O events
- keypresses, mouse clicks, network traffic
- node makes use of synthetic events
- generated by other code
multitasking
- node is "cooperatively multitasked"
- multithreaded code is preemptively multitasked
- sane multithreading involves locking
- temporary exclusive ownership
- mistakes lead to race conditions
- node avoids race conditions while being highly concurrent
- node is fast