From c68e69cb670be224ea597cc37139ef19b0ff60d8 Mon Sep 17 00:00:00 2001
From: Valentin Shergin <shergin@fb.com>
Date: Sun, 25 Nov 2018 22:15:00 -0800
Subject: [PATCH] Fabric: Proper handling of memory pressure event in
 RCTComponentViewRegistry

Summary: View recycling can be pretty aggressive and memory intensive, so we can properly react on system memory-pressure notification.

Reviewed By: mdvacca

Differential Revision: D13176278

fbshipit-source-id: 38ea1b27da988aeaaa5db6ac0b94389a0bd2799e
---
 .../Fabric/Mounting/RCTComponentViewRegistry.mm  | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/React/Fabric/Mounting/RCTComponentViewRegistry.mm b/React/Fabric/Mounting/RCTComponentViewRegistry.mm
index c5e156390..deab9e4b5 100644
--- a/React/Fabric/Mounting/RCTComponentViewRegistry.mm
+++ b/React/Fabric/Mounting/RCTComponentViewRegistry.mm
@@ -81,11 +81,22 @@ const NSInteger RCTComponentViewRegistryRecyclePoolMaxSize = 1024;
     _recyclePool = [NSMapTable mapTableWithKeyOptions:NSPointerFunctionsOpaquePersonality | NSPointerFunctionsOpaqueMemory
                                          valueOptions:NSPointerFunctionsObjectPersonality];
     _componentViewFactory = [RCTComponentViewFactory standardComponentViewFactory];
+
+
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(handleApplicationDidReceiveMemoryWarningNotification)
+                                                 name:UIApplicationDidReceiveMemoryWarningNotification
+                                               object:nil];
   }
 
   return self;
 }
 
+- (void)dealloc
+{
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
 - (UIView<RCTComponentViewProtocol> *)dequeueComponentViewWithComponentHandle:(ComponentHandle)componentHandle
                                                                           tag:(ReactTag)tag
 {
@@ -177,4 +188,9 @@ const NSInteger RCTComponentViewRegistryRecyclePoolMaxSize = 1024;
   [componentViews addObject:componentView];
 }
 
+- (void)handleApplicationDidReceiveMemoryWarningNotification
+{
+  [_recyclePool removeAllObjects];
+}
+
 @end