Spring DI with different styles

-
Spring as a dependency injection (DI) framework allows us to define our application components' dependency tree in three different ways: XML Annotation Java Config I've written a simple app, bookstore, with the three styles and they're available in the following repository. You can take a look and see how each style would look like. It also has a version that uses no Spring beans for comparison. https://github.com/ryu1kn/spring--working-with-beans Different styles have different pros/cons. Spring lets you mix the styles; so you can change it as you go. Here is my observations on each style. XML-based configuration Pros Weak/loose coupling with Spring framework in your app code. Good for keeping the option of removing Spring later Class dependency information is centralised. Fine-grained control on the dependency definition. Changing only the dependency information doesn't require the recompilation of your app code. Cons Unless you have a good IDE ...
2 comments

Use SWI-Prolog's package manager

-
SWI-Prolog has its own package manager (prolog_pack). Available packages are listed here:
I was looking for a way to write lambda expressions in Prolog and found lambda pack on that list. To install/use the package, I rebuilt my swi-prolog to have archive.pl availbale.
  1. Install libarchive-devel (I use openSUSE with zypper, change the command according to your environment)
    $ sudo zypper install libarchive-devel
  2. Fetch the git repository (Or get the source from the official page)
    $ git clone git://www.swi-prolog.org/home/pl/git/pl.git
  3. Follow the instructions in the repository
    1. To download configuration files, submodules and documentations. Do prepare first.
      $ cd pl
$ ./prepare
    2. configure, make and make_install in the src directory
      $ cd src
$ ./configure
$ make
$ make install
    3. configure, make and make_install in the packages directory
      $ cd ../packages
$ ./configure
$ make
$ make install
      Make sure that after you do configure, you have HAVE_ARCHIVE_H 1 in config.h
      $ grep 'HAVE_ARCHIVE_H' config.h
#define HAVE_ARCHIVE_H 1
  4. That's it. Now you can start swi-prolog and install packages.
    $ swipl
Welcome to SWI-Prolog (Multi-threaded, 64 bits, Version 6.4.1-98-g56aab30)
Copyright (c) 1990-2013 University of Amsterdam, VU Amsterdam
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
Please visit http://www.swi-prolog.org for details.

For help, use ?- help(Topic). or ?- apropos(Word).

?- pack_install(lambda).
    After you install the package, you just declare to use it.
    ?- use_module(library(lambda)).

?- maplist(\X^(X>3), [1]).
false.

?- maplist(\X^(X>3), [4]).
true.

Install SWI-Prolog with libarchive on Mac

Installing SWI-Prolog is even easier on Mac OS X if you're using homebrew. But you need to manually add libarchive to its dependencies if you want to use the package manager with the help of archive.pl.
  1. Edit the formula for swi-prolog
    1. Open the formula
      $ brew edit swi-prolog
    2. Add libarchive as its dependency
      require 'formula'

class SwiProlog < Formula

  ...

  depends_on 'libarchive'       # add this line
  depends_on 'readline'
  depends_on 'gmp'
  2. Install SWI-Prolog
    $ brew install swi-prolog
  3. That's it. Now you can move on to 4 to install packages.

Comments

  1. Anonymous5 Dec 2022, 17:52:00

    Most slot bonuses allow you to play for free only a particular choice of slot machines. All information about what games are a part of} every 우리카지노 provide are included in the terms and situations. This game doesn't function a progressive jackpot, so you do not really need to wager the max every time you spin. Slot machine payouts are proportional to what you wager in the game.

    ReplyDelete

Post a Comment

Popular posts from this blog

Use Blogger API from its Java client

-
Google Blogger provides an API to create and edit blog posts on Blogger. See their Introduction here. It also provides API client libraries for various languages including Java, JS, Python, etc. As I haven't found a sample app for the Java client, I'm writing this with the hope that this can save someone's time. In this post, I'm going to create a new blog post with a title "My Test Post" . Prerequisite You have a blog on Blogger (in this post, it's https://blog.example.org ) You have a GCP project with Billing enabled. You have gcloud command installed. cf. here . Steps Enable Blogger API Create OAuth 2.0 credentials Create OAuth consent screen Create a Java app that update your blog Get a new OAuth token Run the Java app to create a new post on your blog Step 1. Enable Blogger API Go to Blogger API page, make sure the correct project is selected, then enable the API. https://console.cloud.google.com/apis/api/blogger.googleapis.com...
Read more

Terraform

-
Organise your infrastructure with terraform How to create reusable infrastructure with Terraform modules How to manage Terraform state But HIL is somehow limited Support for nested maps in variables #2114 Type system to support list and map element types Intermediate variables (OR: add interpolation support to input variables) Use null_data_source Can't create an output map
Read more

Spring DI with different styles

-
Spring as a dependency injection (DI) framework allows us to define our application components' dependency tree in three different ways: XML Annotation Java Config I've written a simple app, bookstore, with the three styles and they're available in the following repository. You can take a look and see how each style would look like. It also has a version that uses no Spring beans for comparison. https://github.com/ryu1kn/spring--working-with-beans Different styles have different pros/cons. Spring lets you mix the styles; so you can change it as you go. Here is my observations on each style. XML-based configuration Pros Weak/loose coupling with Spring framework in your app code. Good for keeping the option of removing Spring later Class dependency information is centralised. Fine-grained control on the dependency definition. Changing only the dependency information doesn't require the recompilation of your app code. Cons Unless you have a good IDE ...
Read more