345 feature instant resolution for already fetched images in prefetch (…

…#349)

* refactor(prefetch): ios

* refactor(prefetch): android

android/src/main/java/com/turboimage/TurboImageModule.kt

@@ -10,12 +10,20 @@ import okhttp3.Headers
 
 class TurboImageModule(private val context: ReactApplicationContext) :
   ReactContextBaseJavaModule(context) {
-    private var imageLoader: ImageLoader? = null
+  private var imageLoader: ImageLoader? = null
 
   override fun getName(): String = REACT_CLASS
 
   @ReactMethod
   fun prefetch(sources: ReadableArray, cachePolicy: String, promise: Promise) {
+    var completedRequestCount = 0
+    fun handleRequestCount() {
+      completedRequestCount++
+      if (sources.size() == completedRequestCount) {
+        promise.resolve(true)
+      }
+    }
+
     val imageRequests = sources.toArrayList().map { source ->
       val uri = (source as HashMap<*, *>)["uri"] as String
       val headers = source["headers"] as? HashMap<*, *>
@@ -28,10 +36,18 @@ class TurboImageModule(private val context: ReactApplicationContext) :
         ImageRequest.Builder(context)
           .headers(headersBuilder.build())
           .data(uri)
+          .listener(
+            onSuccess = { _, _ -> handleRequestCount() },
+            onError = { _, _ -> handleRequestCount() }
+          )
           .build()
       } else {
         ImageRequest.Builder(context)
           .data(uri)
+          .listener(
+            onSuccess = { _, _ -> handleRequestCount() },
+            onError = { _, _ -> handleRequestCount() }
+          )
           .build()
       }
     }
@@ -41,7 +57,6 @@ class TurboImageModule(private val context: ReactApplicationContext) :
     imageRequests.forEach { imageRequest ->
       imageLoader?.enqueue(imageRequest)
     }
-    promise.resolve("Success")
   }
 
   @ReactMethod

ios/TurboImageViewManager.swift

@@ -40,7 +40,9 @@ extension TurboImageViewManager {
       prefetcher = ImagePrefetcher()
     }
     prefetcher?.startPrefetching(with: imageRequests)
-    resolve("Success")
+    prefetcher?.didComplete = {
+      resolve(true)
+    }
   }
 
   @objc
@@ -69,7 +71,7 @@ extension TurboImageViewManager {
     ImageCache.shared.removeAll()
     resolve("Success")
   }
-
+  
   @objc
   func clearDiskCache(_ resolve: @escaping RCTPromiseResolveBlock,
                       reject: @escaping RCTPromiseRejectBlock) {

src/types.ts

@@ -70,7 +70,7 @@ export interface TurboImageProps extends AccessibilityProps, ViewProps {
 }
 
 export type TurboImageApi = {
-  prefetch: (sources: Source[], cachePolicy?: CachePolicy) => Promise<void>;
+  prefetch: (sources: Source[], cachePolicy?: CachePolicy) => Promise<boolean>;
   dispose: (sources: Source[]) => Promise<void>;
   clearMemoryCache: () => Promise<void>;
   clearDiskCache: () => Promise<void>;