CoreFunCoreFun
Lightweight functional primitives for Java 8+. Zero dependencies.
Why CoreFun?
- Zero dependencies - No transitive dependency hell
- Java 8+ compatible - Works on legacy enterprise systems
- Modern Java enhanced - Sealed types on Java 17+ via Multi-Release JAR
- Tiny footprint - Just the essentials, nothing more
- Enterprise-focused - Built for real-world use cases
Installation
<dependency>
<groupId>com.guinetik</groupId>
<artifactId>corefun</artifactId>
<version>0.1.0</version>
</dependency>
Quick Start
// Functional error handling with Result
Result<User, String> result = findUser(id);
String message = result.fold(
error -> "Error: " + error,
user -> "Found: " + user.getName()
);
// Chain operations safely
Result<String, String> greeting = findUser(id)
.map(User::getName)
.map(name -> "Hello, " + name);
Core Components
| Component | Description |
|---|---|
| Result<S,F> | Either-style monad for success/failure handling |
| Try | Convert exceptions to Results |
| Computable<T> | Functional value wrapper with composition |
| SafeRunnable | Runnable that throws checked exceptions |
| SafeCallable<T> | Callable with convenience methods |
| SafeExecutor | Safe execution with timing and logging |
| Loggable | Framework-agnostic logging interface |
| Timing | Operation timing with pluggable reporting |
Java 17+ Features
On Java 17+, Result is a sealed interface with record implementations, enabling exhaustive pattern matching:
// Java 21+ pattern matching
String message = switch (result) {
case Result.Success<User, String>(var user) -> "Found: " + user.getName();
case Result.Failure<User, String>(var error) -> "Error: " + error;
};
License
Apache License 2.0