From c612c615449b8645976429ad1c0661a4f6e56115 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Gregorczyk?= <michalgr@fb.com>
Date: Sat, 12 Nov 2016 14:29:40 -0800
Subject: [PATCH] Make UnpackingJSBundleLoader.prepare a public API.

Reviewed By: brosenfeld

Differential Revision: D4161585

fbshipit-source-id: b3b835610d11e043d2406cccff2da27f07878acc
---
 .../react/cxxbridge/UnpackingJSBundleLoader.java | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/ReactAndroid/src/main/java/com/facebook/react/cxxbridge/UnpackingJSBundleLoader.java b/ReactAndroid/src/main/java/com/facebook/react/cxxbridge/UnpackingJSBundleLoader.java
index a70f82ada..dd593d010 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/cxxbridge/UnpackingJSBundleLoader.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/cxxbridge/UnpackingJSBundleLoader.java
@@ -72,6 +72,11 @@ public class UnpackingJSBundleLoader extends JSBundleLoader {
   private final boolean mFinishOnBackgroundThread;
   private final @Nullable Runnable mOnUnpackedCallback;
 
+  /**
+   * True if prepare was called.
+   */
+  private boolean mPrepared;
+
   /**
    * Synchronizes unpacking within this process.
    */
@@ -96,13 +101,20 @@ public class UnpackingJSBundleLoader extends JSBundleLoader {
     mFinishOnBackgroundThread = builder.finishOnBackgroundThread;
     mOnUnpackedCallback = builder.callback;
     mFileLocker = null;
+    mPrepared = false;
   }
 
   /**
    * Checks if any file needs to be extracted again, and if so, clears the destination
    * directory and unpacks everything again.
+   *
+   * This method does not do anything if called for the second time
    */
-  /* package */ void prepare() {
+  public synchronized void prepare() {
+    if (mPrepared) {
+      return;
+    }
+
     ReactMarker.logMarker(ReactMarkerConstants.UNPACKER_CHECK_START);
 
     boolean unpacked = false;
@@ -131,6 +143,8 @@ public class UnpackingJSBundleLoader extends JSBundleLoader {
     }
 
     ReactMarker.logMarker(ReactMarkerConstants.UNPACKER_CHECK_END);
+
+    mPrepared = true;
   }
 
   private boolean prepareLocked() throws IOException {