OSM Demo

[DieterHolz]

This is just for information, not an issue.

I've build a new OSM Demo:

https://github.com/FHNW-edea/OSMDemo.git

It's based on the demo that's included in this project.

I will use it in some of my courses at FHNW (University of Applied Sciences in Switzerland).

Would be great if some of you could have a look at it and provide feedback.

[p-lr]

Good to know, I'll have a look when I have time.

After a brief look into your code, it looks like your LruCache doesn't have any limit. It retains in memory all tiles which have been fetched, unless you have some clever invalidation logic.
Be careful with this, as it can cause mobile devices to quickly OOM (out of memory).

I believe the easiest way to cache tiles is to leverage already existing cache library.
It's possible using Ktor.

[DieterHolz]

The LruCache is limited. It removes the eldest entries if necessary

override fun put(key: K, value: V): V? = synchronized(lock) {
    val previous = cache[key]
    cache.remove(key)
    cache[key] = value

    if (cache.size > maxSize) {
        repeat (cache.size - maxSize){
            val eldest = cache.keys.first()
            cache.remove(eldest)
        }
    }
    return previous
}

But nevertheless I switched to Ktor caching and removed the self-made LruCache