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<title>MVI Architecture Helper | codeskraps</title>
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<meta name="description" content="Something smart to talk about this helper class
interface StateReceiver&lt;STATE&gt; {
    suspend fun updateState(transform: suspend (STATE) -&gt; STATE)
    suspend fun withState(block: suspend (STATE) -&gt; Unit)
}

suspend inline fun &lt;reified TYPE : STATE, STATE&gt; StateReceiver&lt;STATE&gt;.withType(crossinline block: suspend (TYPE) -&gt; Unit) {
    withState { state -&gt;
        if (state is TYPE) {
            block(state)
        }
    }
}

suspend inline fun &lt;reified TYPE : STATE, STATE&gt; StateReceiver&lt;STATE&gt;.updateWithType(crossinline transform: suspend (TYPE) -&gt; TYPE) {
    withType&lt;TYPE, STATE&gt; { state -&gt; updateState { transform(state) } }
}

interface StateProvider&lt;STATE&gt; {
    val state: StateFlow&lt;STATE&gt;
}

interface IntentReceiver&lt;INTENT&gt; {
    fun handleIntent(intent: INTENT)
}

interface ActionProvider&lt;ACTION&gt; {
    val action: Flow&lt;ACTION&gt;
}

interface ActionReceiver&lt;ACTION&gt; {
    suspend fun sendAction(block: suspend () -&gt; ACTION)
}

interface StateModule&lt;STATE&gt; : StateReceiver&lt;STATE&gt;, StateProvider&lt;STATE&gt;
interface IntentModule&lt;INTENT&gt; : IntentReceiver&lt;INTENT&gt;
interface ActionModule&lt;ACTION&gt; : ActionReceiver&lt;ACTION&gt;, ActionProvider&lt;ACTION&gt;

interface MVIViewModel&lt;STATE, INTENT, ACTION&gt; :
    StateModule&lt;STATE&gt;,
    IntentModule&lt;INTENT&gt;,
    ActionModule&lt;ACTION&gt;

class MVIViewModelDelegate&lt;STATE, INTENT, ACTION&gt;(
    initial: STATE
) : MVIViewModel&lt;STATE, INTENT, ACTION&gt; {

    private val _state = MutableStateFlow(initial)
    override val state: StateFlow&lt;STATE&gt; = _state.asStateFlow()

    private val _action = Channel&lt;ACTION&gt;()
    override val action: Flow&lt;ACTION&gt; = _action.receiveAsFlow()

    override suspend fun updateState(transform: suspend (STATE) -&gt; STATE) {
        _state.update { transform(it) }
    }

    override suspend fun withState(block: suspend (STATE) -&gt; Unit) {
        block(_state.value)
    }

    override suspend fun sendAction(block: suspend () -&gt; ACTION) {
        _action.trySend(block())
    }

    override fun handleIntent(intent: INTENT) {
        throw NotImplementedError()
    }
}" />
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<meta property="og:title" content="MVI Architecture Helper | codeskraps" />
<meta property="og:url" content="http://localhost:1313/posts/mvi_architecture/" />
<meta property="og:description" content="Something smart to talk about this helper class
interface StateReceiver&lt;STATE&gt; {
    suspend fun updateState(transform: suspend (STATE) -&gt; STATE)
    suspend fun withState(block: suspend (STATE) -&gt; Unit)
}

suspend inline fun &lt;reified TYPE : STATE, STATE&gt; StateReceiver&lt;STATE&gt;.withType(crossinline block: suspend (TYPE) -&gt; Unit) {
    withState { state -&gt;
        if (state is TYPE) {
            block(state)
        }
    }
}

suspend inline fun &lt;reified TYPE : STATE, STATE&gt; StateReceiver&lt;STATE&gt;.updateWithType(crossinline transform: suspend (TYPE) -&gt; TYPE) {
    withType&lt;TYPE, STATE&gt; { state -&gt; updateState { transform(state) } }
}

interface StateProvider&lt;STATE&gt; {
    val state: StateFlow&lt;STATE&gt;
}

interface IntentReceiver&lt;INTENT&gt; {
    fun handleIntent(intent: INTENT)
}

interface ActionProvider&lt;ACTION&gt; {
    val action: Flow&lt;ACTION&gt;
}

interface ActionReceiver&lt;ACTION&gt; {
    suspend fun sendAction(block: suspend () -&gt; ACTION)
}

interface StateModule&lt;STATE&gt; : StateReceiver&lt;STATE&gt;, StateProvider&lt;STATE&gt;
interface IntentModule&lt;INTENT&gt; : IntentReceiver&lt;INTENT&gt;
interface ActionModule&lt;ACTION&gt; : ActionReceiver&lt;ACTION&gt;, ActionProvider&lt;ACTION&gt;

interface MVIViewModel&lt;STATE, INTENT, ACTION&gt; :
    StateModule&lt;STATE&gt;,
    IntentModule&lt;INTENT&gt;,
    ActionModule&lt;ACTION&gt;

class MVIViewModelDelegate&lt;STATE, INTENT, ACTION&gt;(
    initial: STATE
) : MVIViewModel&lt;STATE, INTENT, ACTION&gt; {

    private val _state = MutableStateFlow(initial)
    override val state: StateFlow&lt;STATE&gt; = _state.asStateFlow()

    private val _action = Channel&lt;ACTION&gt;()
    override val action: Flow&lt;ACTION&gt; = _action.receiveAsFlow()

    override suspend fun updateState(transform: suspend (STATE) -&gt; STATE) {
        _state.update { transform(it) }
    }

    override suspend fun withState(block: suspend (STATE) -&gt; Unit) {
        block(_state.value)
    }

    override suspend fun sendAction(block: suspend () -&gt; ACTION) {
        _action.trySend(block())
    }

    override fun handleIntent(intent: INTENT) {
        throw NotImplementedError()
    }
}" />


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<section class="single">
    <h1 class="title">MVI Architecture Helper</h1>

    <div class="tip">
        <time datetime="2024-09-27 13:45:09 &#43;0200 CEST">2024/09/27</time>
        <span class="split">·</span>
        <span> 213 words </span>
        <span class="split">·</span>
        <span>
            1 minutes to read
        </span>
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    <div class="content">
        <p>Something smart to talk about this helper class</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-kotlin" data-lang="kotlin"><span style="display:flex;"><span><span style="color:#66d9ef">interface</span> <span style="color:#a6e22e">StateReceiver</span>&lt;STATE&gt; {
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">suspend</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">updateState</span>(transform: <span style="color:#66d9ef">suspend</span> (STATE) <span style="color:#f92672">-&gt;</span> STATE)
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">suspend</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">withState</span>(block: <span style="color:#66d9ef">suspend</span> (STATE) <span style="color:#f92672">-&gt;</span> Unit)
</span></span><span style="display:flex;"><span>}
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">suspend</span> <span style="color:#66d9ef">inline</span> <span style="color:#66d9ef">fun</span> &lt;<span style="color:#66d9ef">reified</span> <span style="color:#a6e22e">TYPE</span> : <span style="color:#a6e22e">STATE</span>, <span style="color:#a6e22e">STATE</span>&gt; <span style="color:#a6e22e">StateReceiver</span>&lt;STATE&gt;.withType(<span style="color:#66d9ef">crossinline</span> block: <span style="color:#66d9ef">suspend</span> (TYPE) <span style="color:#f92672">-&gt;</span> Unit) {
</span></span><span style="display:flex;"><span>    withState { state <span style="color:#f92672">-&gt;</span>
</span></span><span style="display:flex;"><span>        <span style="color:#66d9ef">if</span> (state <span style="color:#66d9ef">is</span> TYPE) {
</span></span><span style="display:flex;"><span>            block(state)
</span></span><span style="display:flex;"><span>        }
</span></span><span style="display:flex;"><span>    }
</span></span><span style="display:flex;"><span>}
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">suspend</span> <span style="color:#66d9ef">inline</span> <span style="color:#66d9ef">fun</span> &lt;<span style="color:#66d9ef">reified</span> <span style="color:#a6e22e">TYPE</span> : <span style="color:#a6e22e">STATE</span>, <span style="color:#a6e22e">STATE</span>&gt; <span style="color:#a6e22e">StateReceiver</span>&lt;STATE&gt;.updateWithType(<span style="color:#66d9ef">crossinline</span> transform: <span style="color:#66d9ef">suspend</span> (TYPE) <span style="color:#f92672">-&gt;</span> TYPE) {
</span></span><span style="display:flex;"><span>    withType&lt;TYPE, STATE&gt; { state <span style="color:#f92672">-&gt;</span> updateState { transform(state) } }
</span></span><span style="display:flex;"><span>}
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">interface</span> <span style="color:#a6e22e">StateProvider</span>&lt;STATE&gt; {
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">val</span> state: StateFlow&lt;STATE&gt;
</span></span><span style="display:flex;"><span>}
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">interface</span> <span style="color:#a6e22e">IntentReceiver</span>&lt;INTENT&gt; {
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">handleIntent</span>(intent: INTENT)
</span></span><span style="display:flex;"><span>}
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">interface</span> <span style="color:#a6e22e">ActionProvider</span>&lt;ACTION&gt; {
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">val</span> action: Flow&lt;ACTION&gt;
</span></span><span style="display:flex;"><span>}
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">interface</span> <span style="color:#a6e22e">ActionReceiver</span>&lt;ACTION&gt; {
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">suspend</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">sendAction</span>(block: <span style="color:#66d9ef">suspend</span> () <span style="color:#f92672">-&gt;</span> ACTION)
</span></span><span style="display:flex;"><span>}
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">interface</span> <span style="color:#a6e22e">StateModule</span>&lt;STATE&gt; : StateReceiver&lt;STATE&gt;, StateProvider&lt;STATE&gt;
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">interface</span> <span style="color:#a6e22e">IntentModule</span>&lt;INTENT&gt; : IntentReceiver&lt;INTENT&gt;
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">interface</span> <span style="color:#a6e22e">ActionModule</span>&lt;ACTION&gt; : ActionReceiver&lt;ACTION&gt;, ActionProvider&lt;ACTION&gt;
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">interface</span> <span style="color:#a6e22e">MVIViewModel</span>&lt;STATE, INTENT, ACTION&gt; :
</span></span><span style="display:flex;"><span>    StateModule&lt;STATE&gt;,
</span></span><span style="display:flex;"><span>    IntentModule&lt;INTENT&gt;,
</span></span><span style="display:flex;"><span>    ActionModule&lt;ACTION&gt;
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MVIViewModelDelegate</span>&lt;STATE, INTENT, ACTION&gt;(
</span></span><span style="display:flex;"><span>    initial: STATE
</span></span><span style="display:flex;"><span>) : MVIViewModel&lt;STATE, INTENT, ACTION&gt; {
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">private</span> <span style="color:#66d9ef">val</span> _state = MutableStateFlow(initial)
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">val</span> state: StateFlow&lt;STATE&gt; = _state.asStateFlow()
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">private</span> <span style="color:#66d9ef">val</span> _action = Channel&lt;ACTION&gt;()
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">val</span> action: Flow&lt;ACTION&gt; = _action.receiveAsFlow()
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">suspend</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">updateState</span>(transform: <span style="color:#66d9ef">suspend</span> (STATE) <span style="color:#f92672">-&gt;</span> STATE) {
</span></span><span style="display:flex;"><span>        _state.update { transform(<span style="color:#66d9ef">it</span>) }
</span></span><span style="display:flex;"><span>    }
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">suspend</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">withState</span>(block: <span style="color:#66d9ef">suspend</span> (STATE) <span style="color:#f92672">-&gt;</span> Unit) {
</span></span><span style="display:flex;"><span>        block(_state.<span style="color:#66d9ef">value</span>)
</span></span><span style="display:flex;"><span>    }
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">suspend</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">sendAction</span>(block: <span style="color:#66d9ef">suspend</span> () <span style="color:#f92672">-&gt;</span> ACTION) {
</span></span><span style="display:flex;"><span>        _action.trySend(block())
</span></span><span style="display:flex;"><span>    }
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">handleIntent</span>(intent: INTENT) {
</span></span><span style="display:flex;"><span>        <span style="color:#66d9ef">throw</span> NotImplementedError()
</span></span><span style="display:flex;"><span>    }
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div>

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