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Hi Trygve.<div><br></div><div>> <span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px">Class MorphicEventDispatcher has 4 methods in 3.10.2 and 16 methods in 5.3.</span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px"><br></span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px">Finally, we managed to improve modularity of Squeak's event handling by assembling -- once scattered -- methods and logic in a place where it can be found and understood. Of course, the number of methods in a class can go up in the process. What you describe as "additional bloat" is clearly a revelation of already existing complexity.</span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px"><br></span></div><div><span style="font-family: Arial, Helvetica, sans-serif"><span style="font-size: 13px">Since the plain number of methods is rather unhelpful to assess code readability, I wonder whether there are better names we can use to guide programmers when exploring MorphicEventDispatcher, its protocols, and methods.</span></span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px"><br></span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px">> </span><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px">Class </span><i style="font-family: Arial, Helvetica, sans-serif;font-size: 13px"><span style="font-size: 12pt;line-height: 17.12px">MyMorph>> processEvent: anEvent using: anIgnoredDispatcher </span></i><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px">is a regular event handler in 3.10.2. In 5.3, it is a filter, and its execution never stops.</span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px"><br></span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px">That's just not true. The dispatcher is still dispatching as it was in Squeak 3.10.2. Event filters were added as a mechanism to tackle the existing mis-use of event listeners. The filter mechanism uses patterns that are already existing in the Squeak system. Yes, there is still room for improvement regarding its modularity.</span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px"><br></span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px">***</span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px"><br></span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px">We need better ways to assess the image quality. Phrases such as "unbelievable image bloat", "many thousands of classes", etc. are not helpful at all. Such a perspective ignores incidental vs. accidental complexity. It also ignores the role of tools in such a live and exploratory programming system.</span></div><div><br></div><div>We need better ways to look beyond the source code. Of course, we strive for a clean, compact, understandable system. However, that goal must not only focus on lines of code, number of methods/classes/packages. Programmers do not just read code to gather understanding. They execute code, play around with objects ---> use tools. Those tools show us the names and relationships of all kinds of software artifacts. Those tools enable very concise, task-specific views on rather complex systems. Those tools can help find redundancy, clarify meaning.</div><div><br></div><div>Don't get me wrong. I am always in favor of removing a class or concept if that is not necessary. I do think twice before adding a new class or extending the inheritance tree.</div><div><br></div><div>However, just counting the number of code artifacts is not a helpful metric to move forward. It can only be a first step in a more throrough exploration process.</div><div><br></div><div>Don't give up. Happy Squeaking! :-)</div><div><br></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px">Best,</span></div><div><span style="font-family: Arial, Helvetica, sans-serif;font-size: 13px">Marcel</span></div><div class="mb_sig"></div>
<blockquote class="history_container" type="cite" style="border-left-style: solid;border-width: 1px;margin-top: 20px;margin-left: 0px;padding-left: 10px;min-width: 500px">
<p style="color: #AAAAAA; margin-top: 10px;">Am 13.08.2020 09:34:39 schrieb Trygve Reenskaug <trygver@ifi.uio.no>:</p><div style="font-family:Arial,Helvetica,sans-serif">
<br>
<span style="mso-spacerun:yes"></span>Dear All,
<br>
Imagine that you bought an iPhone 20 years ago. Over the
years, you have filled it with pictures, contacts, and other
personal data. You
now want to upgrade to iPhone SE and find that all your personal
data are lost
because there is no way to transfer your data. Very sad.<br>
<br>
The same has happened to me with Squeak. The Squeak programs
I have written over the past 20 years are effectively lost because I
can’t port
them to a current version of Squeak. Very sad.<br>
<br>
The essence of object orientation is that objects
collaborate to achieve a goal. I retired 20 years ago and made it my
task to
create DCI (Data-Context-Interaction), a programming paradigm that
merges the
concepts of class and collaboration. BabyIDE is a non-intrusive
Squeak program
that includes a model of DCI as well as tools for programming within
the
paradigm. BabyIDE is a kind of Dynabook, a personal computer for
experts in all
domains. Its target group could be department managers in business
and
industry; they are experts in running their department in
collaboration with
other managers. Another target group could be farmers; they are
experts in
taking care of their animals. A third target group could be
homeowners; they
build expertise in controlling their smart home.<br>
<br>
Squeak is more than a programming language; it is a live
universe of collaborating objects. The shared objects on the web is
also a
universe of collaborating objects that Kevin Kelly called a <i>single,
global
machine</i>. BabyIDE extends the Squeak image into this global
machine, making all the
combined objects available for personal programming as illustrated
below:<br>
<br>
<div align="center"><span style="mso-no-proof:yes"><img src="cid:part1.B8569C86.7E4A26CB@ifi.uio.no" width="497" height="284"></img></span><br>
</div>
<br>
BabyIDE is now running in Squeak 3.10.2, together with a new
Squeak Reverse Engineering tool. I want to port my programs to
Squeak 3.5
to benefit from its improved internet communication facilities. This
port has
been pestering me since April, but the overwhelming complexity of
3.5 has forced
me to accept defeat. I can’t avoid speculating about the nature of
Squeak’s current
target group. It used to be “children of all ages.” Today, it
neither includes
children nor old Smalltalk hands like me (I wrote my first Smalltalk
program in
1978). Stephen Pope, another veteran who also bemoans what is
happening to
Squeak, wrote in a blog: <br>
<br>
<blockquote style="min-width: 500px"><i>“</i><i><span style="font-size: 12.0pt;mso-bidi-font-size: 10.0pt;line-height: 107%">The most popular
systems (Squeak
and Pharo) both suffer from unbelievable image bloat, with
many thousands of
classes, hundreds of root classes, class hierarchies with many
instance
variables in the high-level (abstract) classes, and too many
packages with cute
but meaningless (to a new-comer) names.”</span></i><br>
<span style="font-size: 12.0pt;mso-bidi-font-size: 10.0pt;line-height: 107%">
</span><a href="https://smalltalk.tech.blog/2020/08/10/smalltalks-successor/" moz-do-not-send="true"><span style="font-size: 12.0pt;mso-bidi-font-size: 10.0pt;line-height: 107%">https://smalltalk.tech.blog/2020/08/10/smalltalks-successor/</span></a><br>
</blockquote>
I couldn’t agree more. A few examples:<br>
<br>
<blockquote style="min-width: 500px"><span style="mso-fareast-font-family:Arial;mso-bidi-font-family:Arial"><span style="mso-list:Ignore">1.<span style="font-style: normal;font-variant: normal;font-weight: normal;font-stretch: normal;font-size: 7pt;line-height: normal;font-size-adjust: none;font-kerning: auto;font-optical-sizing: auto;font-language-override: normal;font-feature-settings: normal;font-variation-settings: normal">
</span></span></span>Class Object defines 485 methods. This
means
that every Squeak object understands at least 485 messages. Most
of them are irrelevant to
the problem at hand, but all of them can be part of unexpected
behavior. <br>
<br>
<span style="mso-fareast-font-family:Arial;mso-bidi-font-family:Arial"><span style="mso-list:Ignore">2.<span style="font-style: normal;font-variant: normal;font-weight: normal;font-stretch: normal;font-size: 7pt;line-height: normal;font-size-adjust: none;font-kerning: auto;font-optical-sizing: auto;font-language-override: normal;font-feature-settings: normal;font-variation-settings: normal">
</span></span></span>The state of every Morph object is held
in its
regular instance variables PLUS any number of undeclared and
undocumented
variables in its <i>extension</i>, a Dictionary that may include
another dictionary
inside it. The Morph class comment: <i><span style="font-size: 12.0pt;mso-bidi-font-size: 10.0pt;line-height: 107%">“MorphExtension Allows extra
properties to be stored
without adding a storage burden to all morphs.”</span></i> I’m
more concerned about
the burden put upon the code reader.<br>
<br>
<span style="mso-fareast-font-family:Arial;mso-bidi-font-family:Arial"><span style="mso-list:Ignore">3.<span style="font-style: normal;font-variant: normal;font-weight: normal;font-stretch: normal;font-size: 7pt;line-height: normal;font-size-adjust: none;font-kerning: auto;font-optical-sizing: auto;font-language-override: normal;font-feature-settings: normal;font-variation-settings: normal">
</span></span></span>For me, the final straw was the new
filtering
phase added to Squeak’s already complex event handling mechanism.
Squeak 3.5
has 208 new methods with ‘filter’ in their name, but there is no
indication as
to what they are for and when to use them. The abstract concepts
of event
filtering are documented, but there is no documentation on their
reification
into concrete code. The complexity of a basically simple mechanism
has reached
a new high far beyond the capabilities of my brain.<br>
<br>
<span style="mso-fareast-font-family:Arial;mso-bidi-font-family:Arial"><span style="mso-list:Ignore">4.<span style="font-style: normal;font-variant: normal;font-weight: normal;font-stretch: normal;font-size: 7pt;line-height: normal;font-size-adjust: none;font-kerning: auto;font-optical-sizing: auto;font-language-override: normal;font-feature-settings: normal;font-variation-settings: normal">
</span></span></span>Class MorphicEventDispatcher has 4
methods in
3.10.2 and 16 methods in 5.3.<br>
<br>
<span style="mso-fareast-font-family:Arial;mso-bidi-font-family:Arial"><span style="mso-list:Ignore">5.<span style="font-style: normal;font-variant: normal;font-weight: normal;font-stretch: normal;font-size: 7pt;line-height: normal;font-size-adjust: none;font-kerning: auto;font-optical-sizing: auto;font-language-override: normal;font-feature-settings: normal;font-variation-settings: normal">
</span></span></span>Class <i><span style="font-size: 12.0pt;mso-bidi-font-size: 10.0pt;line-height: 107%">MyMorph>>
processEvent:
anEvent using: anIgnoredDispatcher</span></i><br>
is a regular event handler in 3.10.2. In 5.3, it is a filter, and
its execution
never stops. <br>
</blockquote>
<br>
After 60 years in programming, 42 of them in Smalltalk, and the
last 20 in Squeak, I have reached the end of my patience and
reluctantly have
to quit Squeak programming. It is truly a sad day.<br>
<br>
Have fun and Goodbye, <br>
--Trygve <br>
<br>
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<p class="MsoNormal"><i style="mso-bidi-font-style:normal"><span style="font-size: 10.0pt;mso-fareast-font-family: "Times New
Roman";mso-ansi-language: EN-US" lang="EN-US">The essence of object orientation is
that objects <span class="GramE">collaborate<span style="mso-spacerun:yes"> </span>to</span> achieve a
goal. </span></i><span style="font-size: 10.0pt;mso-fareast-font-family: "Times
New Roman";mso-ansi-language: EN-US" lang="EN-US"><br>
<span class="SpellE">Trygve</span> <span class="SpellE">Reenskaug</span> </span><span style="font-size: 10.0pt;mso-fareast-font-family: "Times
New Roman""><a href="mailto:%20trygver@ifi.uio.no"><span style="mso-ansi-language:
EN-US" lang="EN-US">mailto: trygver@ifi.uio.no</span></a></span><span style="font-size: 10.0pt;mso-fareast-font-family: "Times
New Roman";mso-ansi-language: EN-US" lang="EN-US"><br>
<span class="SpellE">Morgedalsvn</span>.
5A </span><span style="font-size: 10.0pt;mso-fareast-font-family: "Times New Roman""><a href="http://folk.uio.no/trygver/"><span style="mso-ansi-language:EN-US" lang="EN-US">http://folk.uio.no/trygver/</span></a></span><span style="font-size: 10.0pt;mso-fareast-font-family: "Times
New Roman";mso-ansi-language: EN-US" lang="EN-US"><br>
N-0378
Oslo </span><span style="font-size: 10.0pt;mso-fareast-font-family: "Times
New Roman""><a href="http://fullOO.info"><span style="mso-ansi-language:EN-US" lang="EN-US">http://fullOO.info</span></a></span><span style="font-size: 10.0pt;mso-fareast-font-family: "Times
New Roman";mso-ansi-language: EN-US" lang="EN-US"><br>
Norway Tel:
(+47) 468 58 625 </span><span style="font-size: 10.0pt;mso-ansi-language: EN-US" lang="EN-US"><o:p></o:p></span></p>
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