Lifecycle-CompletableFuture

Android 主线程中使用 CompletableFuture. 并且与 Android#Lifecycle 结合起来使用.

Project Background

我司的一个小而美的项目中, 网络方式采用的是RxJava + Retrofit 2 + CompletableFuture(streamsupport版本)方式, 并采用 Kotlin 语言完成.
感觉这种方式挺不错的. 我所在工程因为年久失修, 未能采用诸多现代技术.
但是采用了 streamsupport, 又因为 streamsupport 中的 CompletableFuture 既能像 Future 一样进行异步计算, 也能像 Promise 模式一样避免"回调地狱(Callback Hell)".
唯一遗憾的是 streamsupport#CompletableFuture 默认跟 Android 主线程结合的不太好, 主要是 CompletableFuture.whenComplete()不能在主线程上回调, 因而才有了这个 idea 以及这个 idea 的实现即本工程.

Notes

• Java 8中的CompletableFuture目前为还不能直接在 Android 项目中使用.
  这里的 CompletableFuture 来源于streamsupport.
  更具体地说, 来源于 streamsupport:android-retrofuture.
• 由于main-completablefuture包里的依赖方式采用的是 dependencies#implementation,
  所以依赖于 main-completablefuture 包的工程需要手动添加 streamsupport:android-retrofuture 的依赖.
  例如: implementation 'net.sourceforge.streamsupport:android-retrofuture:1.7.3'

Effect Graph

How to Use?

In Kotlin file:

        start.setOnClickListener {
            CompletableFuture.supplyAsync {
                try {
                    Thread.sleep(1000)

                    Log.i(TAG, Thread.currentThread().toString())
                } catch (e: InterruptedException) {
                    Log.i(TAG, e.message, e)
                }
            }.withStarted(this).whenComplete { t, u ->
                Log.i(TAG, Thread.currentThread().toString())
                if (u != null) {
                    Log.i(TAG, "Throwable", u)
                } else {
                    Log.i(TAG, t?.toString() ?: "null")
                }
            }
        }

MIT License

Copyright (c) 2021 Chen Pan

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