Observable calls can now be retried, previously all retries were failing

app/src/main/java/eu/kanade/tachiyomi/data/network/OkHttpExtensions.kt

@@ -5,24 +5,49 @@ import okhttp3.OkHttpClient
 import okhttp3.Request
 import okhttp3.Response
 import rx.Observable
-import rx.subscriptions.Subscriptions
-import java.io.IOException
+import rx.Producer
+import rx.Subscription
+import java.util.concurrent.atomic.AtomicBoolean
 
 fun Call.asObservable(): Observable<Response> {
     return Observable.create { subscriber ->
-        subscriber.add(Subscriptions.create { cancel() })
+        // Since Call is a one-shot type, clone it for each new subscriber.
+        val call = if (!isExecuted) this else {
+            // TODO use clone method in OkHttp 3.5
+            val field = javaClass.getDeclaredField("client").apply { isAccessible = true }
+            val client = field.get(this) as OkHttpClient
+            client.newCall(request())
+        }
+
+        // Wrap the call in a helper which handles both unsubscription and backpressure.
+        val requestArbiter = object : AtomicBoolean(), Producer, Subscription {
+            override fun request(n: Long) {
+                if (n == 0L || !compareAndSet(false, true)) return
+
+                try {
+                    val response = call.execute()
+                    if (!subscriber.isUnsubscribed) {
+                        subscriber.onNext(response)
+                        subscriber.onCompleted()
+                    }
+                } catch (error: Exception) {
+                    if (!subscriber.isUnsubscribed) {
+                        subscriber.onError(error)
+                    }
+                }
+            }
 
-        try {
-            val response = execute()
-            if (!subscriber.isUnsubscribed) {
-                subscriber.onNext(response)
-                subscriber.onCompleted()
+            override fun unsubscribe() {
+                call.cancel()
             }
-        } catch (error: IOException) {
-            if (!subscriber.isUnsubscribed) {
-                subscriber.onError(error)
+
+            override fun isUnsubscribed(): Boolean {
+                return call.isCanceled
             }
         }
+
+        subscriber.add(requestArbiter)
+        subscriber.setProducer(requestArbiter)
     }
 }
 

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderSettingsDialog.kt

@@ -39,8 +39,7 @@ class ReaderSettingsDialog : DialogFragment() {
 
     override fun onViewCreated(view: View, savedState: Bundle?) = with(view) {
         viewer.onItemSelectedListener = IgnoreFirstSpinnerListener { position ->
-            subscriptions += Observable.timer(250, MILLISECONDS)
-                    .observeOn(AndroidSchedulers.mainThread())
+            subscriptions += Observable.timer(250, MILLISECONDS, AndroidSchedulers.mainThread())
                     .subscribe {
                         (activity as ReaderActivity).presenter.updateMangaViewer(position)
                         activity.recreate()
@@ -50,7 +49,6 @@ class ReaderSettingsDialog : DialogFragment() {
 
         rotation_mode.onItemSelectedListener = IgnoreFirstSpinnerListener { position ->
             subscriptions += Observable.timer(250, MILLISECONDS)
-                    .observeOn(AndroidSchedulers.mainThread())
                     .subscribe {
                         preferences.rotation().set(position + 1)
                     }