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For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Dripping taps, Java threads and the single thread model

Have you ever lain awake at night and listened to dripping taps. "drip, drip, drip" ... until you eventually fall asleep? With one tap, it's rhythmic, but with two taps the two rhythms get intertwined, and result in an apparently patternless racket. If only one tap would wait for the other, it would sound so much better!

With Java threads - that's where you have several program streams running within the same program - you have a very powerful facility, but also a need co-ordinate when you get to points where a shared resource needs to be used, and that's where you use Java's synchronized keyword, and you synchronise based on an object.

Threads and synchronisation are used within Tomcat to handle multiple connections at the same time, and they're used very effectively and hidden from the programmer / Java developer. But the Java developer does need to bear in mind that there may be several user all in his code at the same time, and if there's a danger of such users interfering with each other he should consider the single thread model for his Servlet. In a nutshell, this holds each user of his application at the starting gate until the previous user has completed - it reduces the maximum possible throughput, but on a quiet to medium application, it can make the coding and testing very much easier!

(written 2009-06-01)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
J804 - Java - Threads
  [3040] Doing several things at the same time - Java threads - (2010-11-10)

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Keyboard reading in Perl - character by character not line by line
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Tcl/Tk - why does the canvas widget use a display list?
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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