No subject
Tue Jun 24 21:06:34 EDT 2008
accurate picture of this new technology. Do you have a more formal paper or
website that gives more details? Is this annotation stuff for sure going
into jdk 7?
Here is one practical example of my confusion. On p. 5/29 of your talk, you
mention immutable Dates. What a great choice: Sun totally boofed on Date
and failed to make it be immutable, which makes it non-thread safe and
dangerous to use as, say, a key or a value in a Map cache. So, can you use
@Immutable to effectively make a custom Date type that cannot be mutated?
Does the effect only work with Java code that is compiled with the same type
checker? (That would be a killer and make it less effective,
unfortunately.)
An example where this affected me is in my personal code library. I have a
class called DateUtil that does all kinds of date related processing. Some
of the methods are fairly slow to execute, so, to speed them up, my DateUtil
class can do extensive caching. This means that, say, a Date instance gets
mapped to a String representation of that Date and vice versa. But because
Date is potentially mutable, there are all kinds of encapsulation issues
here. You could take the approach of always cloning incoming and outgoing
Dates to ensure no tampering, but that lowers performance which is the whole
point of using caching in the first place. The approach that I ended up
taking was to use a Date subclass which throws UnsupportedOperationException
whenever a mutating method is called.
Here is another question: can you concatenate a bunch of type checks
together? As in, instead of something verbose like
javac -processor NullnessChecker -processor ImmutableChecker -processor
...
can you do
javac -processor MyFaveCheckers
where MyFaveCheckers has been configured to do all the checks that you want?
Finally, how does your approach compare with JML?
I am sure that your technology must be extensible so that people can write
their own checkers. Some checks that are crucial for me (and I bet a ton of
other people) are:
1) tons of numeric checks: is a byte/short/int/long/float/double
positive/negative/notNegative/notPositive?
is a float/double not NaN or infinite?
2) Strings: the usual check for me is not only is the String not null, but
it also must be not empty and must not be all whitespace
3) tons of other type specific checks (e.g. that a File arg is not only
non-null, but that it exists in the file system and that it is either a
normal file say).
My current solution for all the general checks that I want to do is a custom
class of mine called Check. If you want to see some of the checks that I am
interested in, I am attaching a copy to this email. (It won't compile by
itself, because it has some dependencies on other classes from my code
library, I believe; I can give that to you too if you want.) The major
advantage of a library approach like this is that it always works regardless
of what compiler is used and what client uses it, since the checks are
embedded in the code. But it has many weaknesses too:
a) it imposes a (usually small) runtime execution overhead
b) I suspect that other static analysis tools would find it harder to work
with
c) it does not lead to any automatic javadoc generation of contracts (does
your approach?)
Yours in the quest for programming perfection,
-Brent Boyer
--0016e645b71c1d9463046d6f5fed
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Prof Ernst,<br><br>I have been pouring thru the PDF slides of the JavaOne 2=
009 conference<br>=A0=A0=A0 <a href=3D"http://developers.sun.com/learning/j=
avaoneonline/j1online.jsp?track=3Djavase&yr=3D2009">http://developers.s=
un.com/learning/javaoneonline/j1online.jsp?track=3Djavase&yr=3D2009</a>=
<br>
recently.<br><br>Your talk on "Preventing Bugs with Pluggable Type Che=
cking"<br>=A0=A0=A0 <a href=3D"http://developers.sun.com/learning/java=
oneonline/sessions/2009/pdf/TS-3798.pdf">http://developers.sun.com/learning=
/javaoneonline/sessions/2009/pdf/TS-3798.pdf</a><br>
was especially interesting for me.<br><br>I am extremely interested in writ=
ing robust and bug free software.=A0 One technique that I always try to app=
ly in my work is Design By Contract.=A0 Unfortunately, Java lacks language =
support for this.=A0 (This lack of support, along with that of closures and=
true generics, have to be regarded as the 3 great failures of the language=
...).=A0 So, DBC in Java is always:<br>
<br>a) more verbose<br>=A0=A0=A0 e.g. it is a pain to have to write out eac=
h time<br>=A0=A0=A0=A0=A0=A0=A0 if (obj =3D=3D null) throw new IllegalArgum=
entException("obj =3D=3D null");<br><br>and<br><br>b) bug prone<b=
r>=A0=A0=A0 e.g. you need to write both the code as well as the javadoc for=
the contract, which is redundant, and therefore lends itself to maintenanc=
e problems like when one changes forgetting to update the other<br>
<br>than it ought to be.=A0 Thus, it was exciting to read your paper and se=
e what your thoughts are.<br><br><br>From just the JavaOne slides, I am act=
ually finding it difficult to get an accurate picture of this new technolog=
y.=A0 Do you have a more formal paper or website that gives more details?=
=A0 Is this annotation stuff for sure going into jdk 7?<br>
<br><br>Here is one practical example of my confusion.=A0 On p. 5/29 of you=
r talk, you mention immutable Dates.=A0 What a great choice: Sun totally bo=
ofed on Date and failed to make it be immutable, which makes it non-thread =
safe and dangerous to use as, say, a key or a value in a Map cache.=A0 So, =
can you use @Immutable to effectively make a custom Date type that cannot b=
e mutated?=A0 Does the effect only work with Java code that is compiled wit=
h the same type checker?=A0 (That would be a killer and make it less effect=
ive, unfortunately.)<br>
<br>An example where this affected me is in my personal code library.=A0 I =
have a class called DateUtil that does all kinds of date related processing=
.=A0 Some of the methods are fairly slow to execute, so, to speed them up, =
my DateUtil class can do extensive caching.=A0 This means that, say, a Date=
instance gets mapped to a String representation of that Date and vice vers=
a.=A0 But because Date is potentially mutable, there are all kinds of encap=
sulation issues here.=A0 You could take the approach of always cloning inco=
ming and outgoing Dates to ensure no tampering, but that lowers performance=
which is the whole point of using caching in the first place.=A0 The appro=
ach that I ended up taking was to use a Date subclass which throws Unsuppor=
tedOperationException whenever a mutating method is called.<br>
<br><br>Here is another question: can you concatenate a bunch of type check=
s together?=A0 As in, instead of something verbose like<br>=A0=A0=A0 javac =
-processor NullnessChecker=A0 -processor ImmutableChecker -processor ...<br=
>can you do<br>
=A0=A0=A0 javac -processor MyFaveCheckers<br>where MyFaveCheckers has been =
configured to do all the checks that you want?<br><br><br>Finally, how does=
your approach compare with JML?<br><br><br>I am sure that your technology =
must be extensible so that people can write their own checkers.=A0 Some che=
cks that are crucial for me (and I bet a ton of other people) are:<br>
<br>1) tons of numeric checks: is a byte/short/int/long/float/double positi=
ve/negative/notNegative/notPositive?<br>=A0=A0=A0 is a float/double not NaN=
or infinite?<br><br>2) Strings: the usual check for me is not only is the =
String not null, but it also must be not empty and must not be all whitespa=
ce<br>
<br>3) tons of other type specific checks (e.g. that a File arg is not only=
non-null, but that it exists in the file system and that it is either a no=
rmal file say).<br><br><br>My current solution for all the general checks t=
hat I want to do is a custom class of mine called Check.=A0 If you want to =
see some of the checks that I am interested in, I am attaching a copy to th=
is email.=A0 (It won't compile by itself, because it has some dependenc=
ies on other classes from my code library, I believe; I can give that to yo=
u too if you want.)=A0 The major advantage of a library approach like this =
is that it always works regardless of what compiler is used and what client=
uses it, since the checks are embedded in the code.=A0 But it has many wea=
knesses too:<br>
<br>a) it imposes a (usually small) runtime execution overhead<br><br>b) I =
suspect that other static analysis tools would find it harder to work with<=
br><br>c) it does not lead to any automatic javadoc generation of contracts=
(does your approach?)<br>
<br><br>Yours in the quest for programming perfection,<br><br>-Brent Boyer<=
br><br><br><br><br><br><br>
--0016e645b71c1d9463046d6f5fed--
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