From eb058cfa3d3daf2ffa092850dbe7e377db701bd5 Mon Sep 17 00:00:00 2001
From: Harsh Shandilya <me@msfjarvis.dev>
Date: Fri, 23 Sep 2022 16:42:39 +0530
Subject: [PATCH] refactor(android): abstract away `getMorePosts` type

---
 .../msfjarvis/claw/android/paging/LobstersPagingSource.kt   | 6 +++---
 .../dev/msfjarvis/claw/android/paging/RemoteFetcher.kt      | 6 ++++++
 2 files changed, 9 insertions(+), 3 deletions(-)
 create mode 100644 android/src/main/kotlin/dev/msfjarvis/claw/android/paging/RemoteFetcher.kt

diff --git a/android/src/main/kotlin/dev/msfjarvis/claw/android/paging/LobstersPagingSource.kt b/android/src/main/kotlin/dev/msfjarvis/claw/android/paging/LobstersPagingSource.kt
index e50cf193..92d6f7df 100644
--- a/android/src/main/kotlin/dev/msfjarvis/claw/android/paging/LobstersPagingSource.kt
+++ b/android/src/main/kotlin/dev/msfjarvis/claw/android/paging/LobstersPagingSource.kt
@@ -13,14 +13,14 @@ import kotlinx.coroutines.withContext
 class LobstersPagingSource
 @AssistedInject
 constructor(
-  @Assisted private val getMorePosts: suspend (Int) -> List<LobstersPost>,
+  @Assisted private val remoteFetcher: RemoteFetcher<LobstersPost>,
   @IODispatcher private val ioDispatcher: CoroutineDispatcher,
 ) : PagingSource<Int, LobstersPost>() {
 
   override suspend fun load(params: LoadParams<Int>): LoadResult<Int, LobstersPost> {
     return try {
       val page = params.key ?: 1
-      val posts = withContext(ioDispatcher) { getMorePosts(page) }
+      val posts = withContext(ioDispatcher) { remoteFetcher.getItemsAtPage(page) }
 
       LoadResult.Page(
         data = posts,
@@ -38,6 +38,6 @@ constructor(
 
   @AssistedFactory
   interface Factory {
-    fun create(getMorePosts: suspend (Int) -> List<LobstersPost>): LobstersPagingSource
+    fun create(remoteFetcher: RemoteFetcher<LobstersPost>): LobstersPagingSource
   }
 }
diff --git a/android/src/main/kotlin/dev/msfjarvis/claw/android/paging/RemoteFetcher.kt b/android/src/main/kotlin/dev/msfjarvis/claw/android/paging/RemoteFetcher.kt
new file mode 100644
index 00000000..a59e550b
--- /dev/null
+++ b/android/src/main/kotlin/dev/msfjarvis/claw/android/paging/RemoteFetcher.kt
@@ -0,0 +1,6 @@
+package dev.msfjarvis.claw.android.paging
+
+/** SAM interface to abstract over a remote API that fetches paginated content. */
+fun interface RemoteFetcher<T> {
+  suspend fun getItemsAtPage(page: Int): List<T>
+}