https://github.com/oldratlee/hellokt

HelloKt 😸, my kotlin playground 🎡
https://github.com/oldratlee/hellokt

hello-kt kata kotlin modern-tech playground practice

Last synced: 3 months ago
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HelloKt 😸, my kotlin playground 🎡

• Host: GitHub
• URL: https://github.com/oldratlee/hellokt
• Owner: oldratlee
• Created: 2021-09-18T10:54:18.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2024-09-09T10:48:35.000Z (4 months ago)
• Last Synced: 2024-09-09T12:52:46.735Z (4 months ago)
• Topics: hello-kt, kata, kotlin, modern-tech, playground, practice
• Language: Kotlin
• Homepage:
• Size: 167 KB
• Stars: 2
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# HelloKt 😸

My Kotlin playground:

- new kotlin version

- Gradle Kts

- kotest

## Playground 

- [🍺 `WeakHashMap`: `ConcurrentModificationException` and `GC`](#-weakhashmap-concurrentmodificationexception-and-gc)

- [🍺 `WeakHashMap`: the copy overhead of `WeakHashMap`](#-weakhashmap-the-copy-overhead-of-weakhashmap)

- [🍺 the queue time of tasks in `ThreadPoolExecutor`](#-the-queue-time-of-tasks-in-threadpoolexecutor)

- [🍺 `AhoCorasickDoubleArrayTrie` performance demo](#-ahocorasickdoublearraytrie-performance-demo)

### 🍺 `WeakHashMap`: `ConcurrentModificationException` and `GC`

when `WeakHashMap` key is `gc`ed in the `WeakHashMap` iteration,

`WeakHashMap` iteration will throw `ConcurrentModificationException`?

Demo Result: NO.

Demo code: [`WeakHashMapGcIteration`](src/test/kotlin/playground/weakhashmap/WeakHashMapGcIteration.kt)

```sh

./gradlew execTestMain -P mainClass=playground.weakhashmap.WeakHashMapGcIterationKt

```

### 🍺 `WeakHashMap`: the copy overhead of `WeakHashMap`

Demo Result: copy ~30M items per second.  

test on my MacBookPro16(Intel Core i9).

Demo code: [`WeakHashMapCopyOverheadDemo`](src/test/kotlin/playground/weakhashmap/WeakHashMapCopyOverheadDemo.kt)

```sh

./gradlew execTestMain -P mainClass=playground.weakhashmap.WeakHashMapCopyOverheadDemoKt

```

### 🍺 the queue time of tasks in `ThreadPoolExecutor`

Result:

average queue time = queue size / maximumPoolSize * average task execution time

Demo code: [`TaskQueueTimeThreadPoolExecutorDemo`](src/test/kotlin/playground/threadpool/TaskQueueTimeThreadPoolExecutorDemo.kt)

```sh

./gradlew execTestMain -P mainClass=playground.threadpool.TaskQueueTimeThreadPoolExecutorDemoKt

```

### 🍺 `AhoCorasickDoubleArrayTrie` performance demo

[`AhoCorasickDoubleArrayTrie`](https://github.com/hankcs/AhoCorasickDoubleArrayTrie) performance simple demo.

Result: hit search ~O(1) to the size of search dictionary.

Demo code: [`AhoCorasickDoubleArrayTrieDemo`](src/test/kotlin/playground/text/AhoCorasickDoubleArrayTrieDemo.kt)

```sh

./gradlew execTestMain -P mainClass=playground.text.AhoCorasickDoubleArrayTrieDemoKt

```