amber-docs
record-builder
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amber-docs | record-builder | |
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58 | 35 | |
142 | 647 | |
0.7% | - | |
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5 days ago | 15 days ago | |
HTML | Java | |
GNU General Public License v3.0 only | Apache License 2.0 |
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amber-docs
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Record Patterns point to Java language designers losing their compass
Record patterns are one step on the path to general pattern matching utility. The bigger building block is general deconstructors. I recommend reading Functional Transformation of Immutable Objects by Brian Goetz. The idea of "withers" shown there requires deconstructors:
- Which Kotlin features do you think Java still needs to steal, if any?
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JDK 20 G1/Parallel/Serial GC Changes
https://github.com/openjdk/amber-docs/blob/master/eg-drafts/...
This is the vague plan.
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Deconstruction patterns [Brian Goetz]
You may be joking but...
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Java Records as Embeddables with Hibernate 6
Here is the much more detailed version: https://github.com/openjdk/amber-docs/blob/master/eg-drafts/reconstruction-records-and-classes.md
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Where does the dislike/hate for Java come from?
This kind of pattern matching is discussed in the design notes: https://github.com/openjdk/amber-docs/blob/master/site/design-notes/patterns/pattern-match-object-model.md
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Making Lenses Practical in Java
True, but that only pushes the question of value down the line.
I'm curious about lenses because Java did have a serious problem that required a solution: working with "simple" data correctly was difficult. The chosen solution was ADTs, so we did buy into that. But the approach being explored for transforming records (https://github.com/openjdk/amber-docs/blob/master/eg-drafts/...) only works one level at a time rather than for an entire path. So I wonder how valuable it would be to have a solution for paths. If the answer is that it's mostly valuable for an approach we haven't bought into yet, then we might not need to consider it just yet.
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How I got involved in the Rust community
Just a heads up, something like that spread operator is actually coming sooner or later to java: https://github.com/openjdk/amber-docs/blob/master/eg-drafts/...
Pattern matching (for records) is already a preview feature.
- Should you still be using Lombok?
- Cascade operator in Java
record-builder
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JEP Draft – Derived Record Creation (Preview) – Java
The problem with this approach is that the people will have to build crutches like https://github.com/Randgalt/record-builder and by the time Java adds missing features all the codebases will be forever polluted with legacy workarounds that nobody will dare to remove because of backwards compatibility.
It also hinders adoption of new features as people will prefer to maintain consistency in their codebases.
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Any library you would like to recommend to others as it helps you a lot? For me, mapstruct is one of them. Hopefully I would hear some other nice libraries I never try.
Record builder is pretty good for making builders for your Java 17 records
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Useful & Unknown Java Libraries - Piotr's TechBlog
I always have to bring up RecordBuilder simply because of the included Withers and it being a source generator instead of the Lombok weirdness.
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How to use Java Records
The above is not particularly user-friendly. Luckily compiler plugins can provide the missing feature, most notably RecordBuilder:
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Named Parameters in Java
For records, instead of lombok you can use https://github.com/Randgalt/record-builder which is a valid annotation processor and will not break on JDK changes
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has anyone written custom annotations using Lombok ?
In this particular case you can generate the builder with something like https://github.com/Randgalt/record-builder that is both valid java and lombok-like enough
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I made a java client for the todoist api
Records + Record Builder or immutables + the trick to hide the implementing class w/sealed are your friend. Both the mutability and naming conventions this generates are vomitus.
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"With" for records -- Brian Goetz
Did you use https://github.com/Randgalt/record-builder ?
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What's your top Java pet peeve?
Try my annotation processor. It generates withers. https://github.com/Randgalt/record-builder
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Stay with Java(+Spring) or pivot towards Go/Python?
I personally don't use that one much, but you could use this library instead.
What are some alternatives?
adoptium.net - Development of the website has moved to https://github.com/adoptium/website-v2
MapStruct - An annotation processor for generating type-safe bean mappers
jmolecules - Libraries to help developers express architectural abstractions in Java code
Lombok - Very spicy additions to the Java programming language.
prettier-java - Prettier Java Plugin
awesome-annotation-processing - A curated list of resources related to the Java annotation processing API (JSR 269)
FizzBuzz Enterprise Edition - FizzBuzz Enterprise Edition is a no-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes.
core - An advanced and highly optimized Java library to build frameworks: it's useful for scanning class paths, generating classes at runtime, facilitating the use of reflection, scanning the filesystem, executing stringified source code and much more...
vim-fibo-indent - Fibonacci Indentation for Vim.
Immutables - Annotation processor to create immutable objects and builders. Feels like Guava's immutable collections but for regular value objects. JSON, Jackson, Gson, JAX-RS integrations included
ImportExcel - PowerShell module to import/export Excel spreadsheets, without Excel
Jackson JSON Processor - Main Portal page for the Jackson project