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| pohvak |
someone with knowledge in Spark? I'm trying to read data from .avro files stored in HDFS, but can't find a guide to read and learn about it, any clue? |
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| DunceCotus |
Javaya Wireless |
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| zikani03 |
hello folks, what tools are you using to monitor your java processes.. esp looking at things like a rabbitmq consumer program |
[04:37]
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| mitch0 |
end-users :) |
[04:39]
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| DunceCotus |
zikani03 like a profiler? |
[04:44]
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| Diablo-D3 |
d) I don't monitor my java processes |
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| zikani03 |
DunceCotus: yes, along those lines |
[04:46]
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| DunceCotus |
yourkits alright but its paid |
[04:46]
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| DunceCotus |
I wish there was a good free alternative |
[04:47]
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| yawkat |
theres always visualvm |
[04:47]
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| yawkat |
but yes, not as good as yourkit |
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| zikani03 |
will look into YourKit, once tried visualvm and even glowroot but they aren't too convenient |
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| _lucifer |
look into JFR as well |
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| [twisti] |
im with mitch, our most important metric is the load status of our customer tech support hotline |
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| FabioP |
so.. the big part of my spring rest api integration test is basically the db setup for loading dummy data to test to.. are there any best practice in how to go around that? should i test my tests DbInit class the does a bunch of inserts/delete before/after every test run? |
[06:41]
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| dreamreal |
assuming I understood the english here, yes |
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| FabioP |
ok.. thanks |
[06:43]
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| FabioP |
kind of a letdown to test my test test |
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| [twisti] |
FabioP: there are libraries to ease spooling up and cleaning database instances for and between testing, you can google around for your specific test framework |
[06:46]
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| Maldivia |
isn't that what DbInit is for? |
[06:47]
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| FabioP |
[twisti] i'm using spring but i didn't found anything of the sort so far |
[06:47]
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| FabioP |
spring boot |
[06:47]
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| dreamreal |
FabioP: note also that spring boot supports schema.sql and... db.sql |
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| dreamreal |
db.sql allows you to initialize your database |
[06:48]
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| FabioP |
yes but it's rather complex setup so i couldn't use plain sql for that |
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| dreamreal |
also see dbunit, which is designed to help with database-oriented things in tests |
[06:48]
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| dreamreal |
FabioP: you can't use plain sql? |
[06:48]
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| dreamreal |
Why not? I mean... pgdump my_database > db.sql # done |
[06:48]
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| FabioP |
uhm |
[06:49]
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| dreamreal |
(let me guess: not using postgres!) |
[06:49]
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| Maldivia |
ohh, dbinit vs dbunit -- me remembering wrong :D |
[06:49]
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| FabioP |
if you put it that way.. yes this seems much more convenient |
[06:49]
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| [twisti] |
theres also a library that can spool up database instances in docker containers, i think the name is 'testcontainers' |
[06:49]
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| FabioP |
yes unfortunately i'm not on docker yet |
[06:49]
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| FabioP |
i could have just dumped a pregenerated db |
[06:50]
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| FabioP |
thanks for the suggestions! |
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| deebo |
FabioP: we have tests that just start the spring context and a postgres docker container for data, the problem here is that springs @transactional doesnt work here, and over time the test runs have bloated to 60mins |
[07:00]
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| deebo |
for any new things we just use mockmvc to test that the rest api responds properly in different scenarios so that the tests are way faster and easier to manage |
[07:01]
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| deebo |
at least imo the actual rest controller should not have any logic, so they're easier to test and tests can be done on a level where @transactional tests work and are way faster |
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| Denyol |
Hi, does anyone know if there is a design pattern that describes building a wrapper object to encapsulate an object from a library to restrict the methods that are exposed by the encapsulated object |
[07:03]
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| dreamreal |
sure, decorator pattern |
[07:05]
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| dreamreal |
you can also use different interfaces for this |
[07:06]
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| Denyol |
I can give an example |
[07:06]
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| Denyol |
pastebin |
[07:06]
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| Denyol |
Please paste your code and any errors online. For runnable classes, try https://ideone.com/ . For general code and errors, use https://gist.github.com or https://dpaste.org/ |
[07:06]
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| dreamreal |
interface A { void b(); } interface C extends A { void d(); } class E implements B {} A getAnE() { return new E(); } |
[07:06]
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| dreamreal |
the value from getAnE() won't "expose" d() - although it can be cast. But you can also create a class F then wraps E and implements only A, not B. |
[07:07]
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| Denyol |
https://gist.github.com/Denyol/ee60e32265e005954fd1a53729622e4f |
[07:07]
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| Denyol |
I think I have done the latter |
[07:08]
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| Denyol |
The intent is to stop users of the object from accessing the internal Cell object and modifying it, since it isn't immutable |
[07:11]
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| Denyol |
It's a bit frivolous because I am the only user of the code |
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| FabioP |
deebo i'm using mockmvc to mock controllers but i keep services classes not mocked, so far i don't have issue, just had to put a @Transactional on tests that uses a deleteBy* spring data jpa method because of spring reasons |
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[08:11]
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| Denyol |
Is there a good reason to make getter methods for final fields in an immutable object? |
[08:11]
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| dreamreal |
consistency, discoverability |
[08:11]
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| dreamreal |
other programmers expect accessors, and surprising them is usually a less-than-great idea |
[08:12]
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| Denyol |
I see your point, but doesn't it just lead to a bloated class |
[08:12]
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| dreamreal |
lombok |
[08:13]
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| dreamreal |
dreamreal, lombok is a tooling (compiler and IDE) plugin that removes boilerplate. For example, it adds getters, setters, equals, hashCode, builders, etc for you. Works in eclipse, intellij, netbeans, javac, maven, ant, etc. https://projectlombok.org/ |
[08:13]
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| dreamreal |
as far as "bloated class" -- what does "bloat" mean here? In a class with twelve attributes, you would have twelve methods, that's < 1k |
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[08:13]
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| dreamreal |
the SMALLEST computer I have at home has 4G ram |
[08:13]
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| dreamreal |
unless you count devices like the arduino and kaiterra sensors, which don't run java |
[08:14]
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| dreamreal |
that 1k method size expenditure would happen once in a given classloader; have 4M instances of the class? ... 1k method ref table |
[08:14]
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| Denyol |
But is there something inherently wrong with exposing immutable final fields as public |
[08:15]
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| dreamreal |
no |
[08:15]
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| dreamreal |
but you asked why you would make accessors, so I told you |
[08:15]
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| dreamreal |
the counterargument ("bloat") is a red herring IMO |
[08:15]
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| Denyol |
Thats true, thank you; I see that its a best practice to make getters and setters |
[08:15]
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| dreamreal |
and lombok makes it trivial: @Data class A { int b,c,d,e,f,g,h,i,j,k,l,m; } // done |
[08:17]
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| dreamreal |
getA(), getB(), getC(), etc, all done (although @Data is for mutable classes, so you'd get more than you're asking for; you can, of course, use @Getter int a,b,c,d,e,f,g...}) |
[08:18]
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| Maldivia |
record A(int a, int b, int c, int d){} // :D |
[08:23]
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| dreamreal |
yeah but that's awful new-fangled thar |
[08:26]
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| dreamreal |
... records aren't in java 11, are they? |
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| Maldivia |
nope :/ |
[08:31]
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| sbalmos |
data class A(val a: int, val b: int, val c: int, val d: int) {} :P |
[08:33]
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| dmlloyd |
it's a lot of work to avoid hitting Alt-Insert -> Generate getter and setter :) |
[08:36]
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| dreamreal |
If you program with only one finger that key combo's rough |
[08:42]
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| dreamreal |
you're clearly an ableist |
[08:42]
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| dmlloyd |
mm |
[08:43]
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| sbalmos |
dreamreal: on-screen keyboard. :P |
[08:43]
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| dreamreal |
D |
[08:43]
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| dmlloyd |
sticky keys |
[08:43]
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| dmlloyd |
customizable keymap! |
[08:43]
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| dreamreal |
keyboards driven by eyes, yeah... you cross your eyes to hit key combinations |
[08:43]
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| sbalmos |
dmlloyd: that's just a can of Coke poured in the keyboard and left out in the sun |
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[08:54]
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| moogs |
What's the best place to look for HCL programming |
[08:55]
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| wedr |
What is HCL? |
[08:57]
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[09:00]
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| dreamreal |
probably google |
[09:04]
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[09:13]
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| moogs |
Thanks @dreamreal |
[09:17]
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| moogs |
What is the best way to produce a list of unique values in programming? I am working on a view |
[09:18]
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| dmlloyd |
those are all extremely general terms |
[09:18]
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| dmlloyd |
are you writing a Java program? |
[09:19]
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| dreamreal |
moogs: errr |
[09:19]
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| dmlloyd |
otherwise there's #programming |
[09:19]
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| moogs |
I believe this is programmed in Java. |
[09:19]
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| moogs |
It's HCL, which uses Java |
[09:19]
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| vecnah |
hcl notes? |
[09:19]
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| dmlloyd |
in Java, a collection of unique values is called a `Set` |
[09:19]
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| dreamreal |
HCL is general |
[09:19]
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| dreamreal |
moogs: so is this a java question or an HCL question? |
[09:20]
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| moogs |
HCL, moving over to the general chat room |
[09:20]
|
| moogs |
Thanks y'all. |
[09:20]
|
| moogs |
) |
[09:20]
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| dreamreal |
enjoy |
[09:20]
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| wedr |
oh my gosh, I just suffered from information overload. There is this part of Spring Framework, called the Spring Boot Actuators, where I would need to research how to tie the endpoints to Amazon EC2 URL registering/deregistering system (or something) that maps the actuator endpoints to newly spun-up containers to be able to do health checks. |
[10:48]
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| wedr |
Where do I start? I'm at a loss. |
[10:48]
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| wedr |
The world of devops is amazingly terrifying... |
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| FabioP |
i would start in creating a custom actuator with dummy data, after that i would try to connect to your amazon service |
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