Decouple JSBundleLoader from CatalystInstanceImpl

Summary: Right now JSBundleLoader is tightly coupled to CatalystInstanceImpl; this diffs adds an interface, JSBundleLoaderDelegate, that CatalystInstanceImpl implements so that we can use the bundle loader with other classes.

Reviewed By: mdvacca

Differential Revision: D13216752

fbshipit-source-id: fc406ef30f12ed9d3ed13a062dedd7b33f3b7985

ReactAndroid/src/main/java/com/facebook/react/bridge/JSBundleLoaderDelegate.java

@@ -0,0 +1,58 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.bridge;
+
+import android.content.Context;
+import android.content.res.AssetManager;
+
+/**
+ * An interface for classes that initialize JavaScript using {@link JSBundleLoader}
+ */
+public interface JSBundleLoaderDelegate {
+
+  /**
+   * Load a JS bundle from Android assets. See {@link JSBundleLoader#createAssetLoader(Context, String, boolean)}
+   * @param assetManager
+   * @param assetURL
+   * @param loadSynchronously
+   */
+  void loadScriptFromAssets(AssetManager assetManager, String assetURL, boolean loadSynchronously);
+
+  /**
+   * Load a JS bundle from the filesystem.
+   * See {@link JSBundleLoader#createFileLoader(String)} and {@link JSBundleLoader#createCachedBundleFromNetworkLoader(String, String)}
+   * @param fileName
+   * @param sourceURL
+   * @param loadSynchronously
+   */
+  void loadScriptFromFile(String fileName, String sourceURL, boolean loadSynchronously);
+
+  /**
+   * Load a delta bundle from Metro.
+   * See {@link JSBundleLoader#createDeltaFromNetworkLoader(String, NativeDeltaClient)}
+   * @param sourceURL
+   * @param deltaClient
+   * @param loadSynchronously
+   */
+  void loadScriptFromDeltaBundle(
+    String sourceURL,
+    NativeDeltaClient deltaClient,
+    boolean loadSynchronously);
+
+  /**
+   * This API is used in situations where the JS bundle is being executed not on
+   * the device, but on a host machine. In that case, we must provide two source
+   * URLs for the JS bundle: One to be used on the device, and one to be used on
+   * the remote debugging machine.
+   *
+   * @param deviceURL A source URL that is accessible from this device.
+   * @param remoteURL A source URL that is accessible from the remote machine
+   * executing the JS.
+   */
+  void setSourceURLs(String deviceURL, String remoteURL);
+}