Refactor `DefaultImapDecoderFactory` to Use POJO Style and Constructo… #2410

superbAura · 2024-09-16T05:23:27Z

…r Injection

Updated DefaultImapDecoderFactory to adhere to POJO design principles.
Replaced internal ImapParserFactory creation with constructor injection of UnpooledStatusResponseFactory.
Improved decoupling and maintainability by explicitly managing dependencies via the constructor.
Updated class and method documentation to reflect changes and clarify the role of the factory.

This change enhances the clarity and testability of the DefaultImapDecoderFactory by removing direct dependency creation and enforcing a cleaner, more modular structure.

…r Injection - Updated `DefaultImapDecoderFactory` to adhere to POJO design principles. - Replaced internal `ImapParserFactory` creation with constructor injection of `UnpooledStatusResponseFactory`. - Improved decoupling and maintainability by explicitly managing dependencies via the constructor. - Updated class and method documentation to reflect changes and clarify the role of the factory. This change enhances the clarity and testability of the `DefaultImapDecoderFactory` by removing direct dependency creation and enforcing a cleaner, more modular structure.

superbAura · 2024-09-16T05:25:46Z

Hello,

I am currently reviewing Apache James for developing a mail engine. While forking the source, I noticed a simple TO-DO comment and made a commit request.

Starting from 2025, we plan to use Apache James extensively. If given the opportunity, I would like to contribute significantly to its improvements.

Thank you!

Arsnael

Hello. Thank you for the contribution, happy to see you so interested in using and contributing more to james in a near future. Welcome!

Comment below

Arsnael · 2024-09-16T06:24:51Z

protocols/imap/src/main/java/org/apache/james/imap/main/DefaultImapDecoderFactory.java

+     *
+     * @param unpooledStatusResponseFactory The factory for creating status responses.
+     */
+    public DefaultImapDecoderFactory(UnpooledStatusResponseFactory unpooledStatusResponseFactory) {


That code is very old... Aint very sure about this part but problems I can see:

several test classes depend on DefaultImapDecoderFactory.buildImapDecoder() . This change without being adapted is definitely gonna break them

have a look in IMAPServerModule . The DefaultImapDecoder is being provided by building directly it, not passing by the Factory. It would make sense maybe to do a refactoring there as well.

you might want to pass the ImapCommandParserFactory as an argument too (to use in IMAPServerModule)

you could maybe have a static method that would return a default imap encoder (as of now) just for tests purposes

Understood. I will check if it's possible to refactor based on what you mentioned.
Thank you for the review.

No problem, don't hesitate to ask if you got issues

First, added a default constructor for DefaultImapDecoderFactory.

This addition enhances flexibility by allowing other classes to use the default constructor.

Additionally, added another constructor that accepts an implementation of StatusResponseFactory.

This change is to provide flexibility for the ResponseFactory in DefaultImapDecoderFactory in the future.

Also modified two other test classes to use the constructor-based approach

The continuous-integration/jenkins/pr-merge failed. I will check it.

chibenwa

THis is great! Happy to further hear about your use cases and welcome onboard the community.

So as this very changeset I cannot say better than @Arsnael ;-)

…ility Updated DefaultImapDecoderFactory to use a generic type T for flexibility, allowing any implementation of StatusResponseFactory. Introduced a parameterized constructor that accepts an instance of StatusResponseFactory to facilitate various implementations. Retained the default constructor, which now initializes with UnpooledStatusResponseFactory as the default implementation. Enhanced modularity by enabling constructor injection, improving decoupling, and reducing hardcoded dependencies. Updated class and method documentation to reflect the use of generics and the new constructor design. Modified IMAPHealthCheckTest and IMAPServerTest to replace static function calls with instance creation using the new keyword, enhancing readability and flexibility in test code. This change improves the flexibility and reusability of the DefaultImapDecoderFactory by supporting multiple StatusResponseFactory implementations while maintaining a default behavior. Additionally, it improves test code clarity by using a more explicit object creation approach.

# Conflicts: # protocols/imap/src/main/java/org/apache/james/imap/main/DefaultImapDecoderFactory.java

chibenwa · 2024-09-19T12:40:58Z

protocols/imap/src/test/java/org/apache/james/imap/main/DefaultImapDecoderFactoryTest.java

@@ -0,0 +1,39 @@
+package org.apache.james.imap.main;


THis file misses the compulsory ASF V2 license

Added the ASF license notice to the source files. Please feel free to review and let me know if there are any concerns. Thank you! !

Add ASF license notice to source files

Arsnael · 2024-09-20T04:52:04Z

protocols/imap/src/main/java/org/apache/james/imap/main/DefaultImapDecoderFactory.java

+     */
+    public DefaultImapDecoderFactory(StatusResponseFactory statusResponseFactory) {
+        this.statusResponseFactory = statusResponseFactory;
+        this.imapCommandParserFactory = new ImapParserFactory(statusResponseFactory);


Not necessary, you should pass that as an argument as well, and not building the default (that you can pass via your DefaultImapDecoderFactory() constructor)

Arsnael · 2024-09-20T04:54:35Z

3 Checkstyle issues in the build. What IDE are you using btw? i personally use Intellij and it allows to navigate easily in the project. Also you can have a plugin to apply and check the checkstyle (to make sure it respects a certain number of coding rules within the project).

Checkstyle file used by James is at the root f the project: https://github.com/apache/james-project/blob/master/checkstyle.xml

Also I don't see a refactoring in IMAPServerModule to use the factory for building the DefaultImapDecoder?

superbAura · 2024-09-20T06:08:09Z

I also use IntelliJ.
@Arsnael
I will improve the factory and builder pattern in the IMAPServerModule module.

Thank you.

If you have any references that I can refer to, I would appreciate it

Applied DefaultImapDecoderFactory to IMAPServerModule and enforced code style

Arsnael · 2024-09-20T07:39:11Z

protocols/imap/src/test/java/org/apache/james/imap/main/DefaultImapDecoderFactoryTest.java

+        // Build an ImapDecoder using the factory and assert it's not null
+        ImapDecoder decoder = factory.buildImapDecoder();
+        assertNotNull(decoder, "ImapDecoder instance should not be null");
+    }


Maybe add a unit test for the constructor public DefaultImapDecoderFactory(ImapCommandParserFactory imapCommandParserFactory, StatusResponseFactory statusResponseFactory) and I think it should be alright for me

Arsnael · 2024-09-20T07:40:05Z

06:36:13,438 [ERROR] Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:3.3.0:check (check-style) on project protocols-imap: You have 1 Checkstyle violation. -> [Help 1]

Still one checkstyle issue somewhere :)

check-style

Arsnael · 2024-09-20T09:44:51Z

Why all the indents? Can you not change that please? Thanks

DefaultImapDecoderFactoryTest code convention

Test codeStyle

[fix] codeStyle

superbAura · 2024-09-20T12:24:24Z

@Arsnael

After applying the Code Style in my IntelliJ, the code style was applied to the source I modified, and the indentation was updated.

I will rollback if it causes any issues.
I fixed the build errors caused by the Code Style. may be .. build runtime is so long

The process of checking Code Style during the build was a refreshing experience for me.
I learned a lot today as well.

Arsnael reviewed Sep 16, 2024

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chibenwa reviewed Sep 16, 2024

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superbAura and others added 8 commits September 19, 2024 15:21

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# Conflicts: # protocols/imap/src/main/java/org/apache/james/imap/main/DefaultImapDecoderFactory.java

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chibenwa reviewed Sep 19, 2024

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superbAura added 2 commits September 20, 2024 11:01

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Arsnael reviewed Sep 20, 2024

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Applied DefaultImapDecoderFactory to IMAPServerModule and enforced code style

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Arsnael reviewed Sep 20, 2024

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DefaultImapDecoderFactoryTest code convention

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Refactor `DefaultImapDecoderFactory` to Use POJO Style and Constructo… #2410

Refactor `DefaultImapDecoderFactory` to Use POJO Style and Constructo… #2410

superbAura commented Sep 16, 2024

superbAura commented Sep 16, 2024

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superbAura commented Sep 20, 2024

Refactor DefaultImapDecoderFactory to Use POJO Style and Constructo… #2410

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Refactor DefaultImapDecoderFactory to Use POJO Style and Constructo… #2410

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superbAura commented Sep 20, 2024

Refactor `DefaultImapDecoderFactory` to Use POJO Style and Constructo… #2410

Refactor `DefaultImapDecoderFactory` to Use POJO Style and Constructo… #2410