# scijava-listeners

**Repository Path**: mirrors_scijava/scijava-listeners

## Basic Information

- **Project Name**: scijava-listeners
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-09-25
- **Last Updated**: 2025-10-05

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

[![Build Status](https://github.com/scijava/scijava-listeners/actions/workflows/build.yml/badge.svg)](https://github.com/scijava/scijava-listeners/actions/workflows/build.yml)

# scijava-listeners

Helper class for maintaining lists of listeners.

Usage example:
```java
public interface MyListener
{
    void somethingChanged();
}

public class Listenable
{
    // Create a variant of Listeners.List
    private final Listeners.List< MyListener > listeners = new Listeners.SynchronizedList<>();

    // Use Listeners.List.list to call registered listeners
    private void notifyListeners() {
        listeners.list.forEach( MyListener::somethingChanged );
    }

    // expose only Listeners (not Listeners.List) to allow un/registering listeners
    public Listeners< MyListener > myListeners() {
        return listeners;
    }
}

public class Listening
{
    public Listening( Listenable l ) {
        l.myListeners().add( this::notifyMe );
    }

    void notifyMe() {
        System.out.println( "something changed!");
    }
}
```