Pool dynamic

Reviewed By: ahmedre

Differential Revision: D4398446

fbshipit-source-id: ff528b7b52a2b1521627c0fca17b7ee2b18102de

ReactAndroid/src/main/java/com/facebook/react/bridge/BUCK

@@ -25,6 +25,7 @@ android_library(
     react_native_dep('java/com/facebook/systrace:systrace'),
     react_native_dep('libraries/fbcore/src/main/java/com/facebook/common/logging:logging'),
     react_native_dep('libraries/soloader/java/com/facebook/soloader:soloader'),
+    react_native_dep('third-party/android/support/v4:lib-support-v4'),
     react_native_dep('third-party/java/infer-annotations:infer-annotations'),
     react_native_dep('third-party/java/jsr-305:jsr-305'),
     react_native_target('java/com/facebook/react/common:common'),
@@ -33,4 +34,3 @@ android_library(
     'PUBLIC',
   ],
 )
-

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

@@ -121,7 +121,7 @@ public abstract class BaseJavaModule implements NativeModule {
         @Override
         public Dynamic extractArgument(
             CatalystInstance catalystInstance, ExecutorToken executorToken, ReadableNativeArray jsArguments, int atIndex) {
-          return new DynamicFromArray(jsArguments, atIndex);
+          return DynamicFromArray.create(jsArguments, atIndex);
         }
       };
 

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

@@ -21,4 +21,5 @@ public interface Dynamic {
   ReadableArray asArray();
   ReadableMap asMap();
   ReadableType getType();
+  void recycle();
 }

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

@@ -9,51 +9,92 @@
 
 package com.facebook.react.bridge;
 
+import javax.annotation.Nullable;
+
+import android.support.v4.util.Pools;
+
 /**
  * Implementation of Dynamic wrapping a ReadableArray.
  */
 public class DynamicFromArray implements Dynamic {
+  private static final Pools.SimplePool<DynamicFromArray> sPool = new Pools.SimplePool<>(10);
 
-  private final ReadableArray mArray;
-  private final int mIndex;
+  private @Nullable ReadableArray mArray;
+  private int mIndex = -1;
 
-  public DynamicFromArray(ReadableArray array, int index) {
-    mArray = array;
-    mIndex = index;
+  // This is a pools object. Hide the constructor.
+  private DynamicFromArray() {}
+
+  public static DynamicFromArray create(ReadableArray array, int index) {
+    DynamicFromArray dynamic = sPool.acquire();
+    if (dynamic == null) {
+      dynamic = new DynamicFromArray();
+    }
+    dynamic.mArray = array;
+    dynamic.mIndex = index;
+    return dynamic;
+  }
+
+  @Override
+  public void recycle() {
+    mArray = null;
+    mIndex = -1;
+    sPool.release(this);
   }
 
   @Override
   public boolean asBoolean() {
+    if (mArray == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mArray.getBoolean(mIndex);
   }
 
   @Override
   public double asDouble() {
+    if (mArray == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mArray.getDouble(mIndex);
   }
 
   @Override
   public int asInt() {
+    if (mArray == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mArray.getInt(mIndex);
   }
 
   @Override
   public String asString() {
+    if (mArray == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mArray.getString(mIndex);
   }
 
   @Override
   public ReadableArray asArray() {
+    if (mArray == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mArray.getArray(mIndex);
   }
 
   @Override
   public ReadableMap asMap() {
+    if (mArray == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mArray.getMap(mIndex);
   }
 
   @Override
   public ReadableType getType() {
+    if (mArray == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mArray.getType(mIndex);
   }
 }

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

@@ -9,51 +9,92 @@
 
 package com.facebook.react.bridge;
 
+import javax.annotation.Nullable;
+
+import android.support.v4.util.Pools;
+
 /**
  * Implementation of Dynamic wrapping a ReadableMap.
  */
 public class DynamicFromMap implements Dynamic {
+  private static final Pools.SimplePool<DynamicFromMap> sPool = new Pools.SimplePool<>(10);
 
-  private final ReadableMap mMap;
-  private final String mName;
+  private @Nullable ReadableMap mMap;
+  private @Nullable String mName;
 
-  public DynamicFromMap(ReadableMap map, String name) {
-    mMap = map;
-    mName = name;
+  // This is a pools object. Hide the constructor.
+  private DynamicFromMap() {}
+
+  public static DynamicFromMap create(ReadableMap map, String name) {
+    DynamicFromMap dynamic = sPool.acquire();
+    if (dynamic == null) {
+      dynamic = new DynamicFromMap();
+    }
+    dynamic.mMap = map;
+    dynamic.mName = name;
+    return dynamic;
+  }
+
+  @Override
+  public void recycle() {
+    mMap = null;
+    mName = null;
+    sPool.release(this);
   }
 
   @Override
   public boolean asBoolean() {
+    if (mMap == null || mName == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mMap.getBoolean(mName);
   }
 
   @Override
   public double asDouble() {
+    if (mMap == null || mName == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mMap.getDouble(mName);
   }
 
   @Override
   public int asInt() {
+    if (mMap == null || mName == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mMap.getInt(mName);
   }
 
   @Override
   public String asString() {
+    if (mMap == null || mName == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mMap.getString(mName);
   }
 
   @Override
   public ReadableArray asArray() {
+    if (mMap == null || mName == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mMap.getArray(mName);
   }
 
   @Override
   public ReadableMap asMap() {
+    if (mMap == null || mName == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mMap.getMap(mName);
   }
 
   @Override
   public ReadableType getType() {
+    if (mMap == null || mName == null) {
+      throw new IllegalStateException("This dynamic value has been recycled");
+    }
     return mMap.getType(mName);
   }
 }

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

@@ -90,7 +90,7 @@ public class JavaOnlyArray implements ReadableArray, WritableArray {
 
   @Override
   public Dynamic getDynamic(int index) {
-    return new DynamicFromArray(this, index);
+    return DynamicFromArray.create(this, index);
   }
 
   @Override

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

@@ -90,7 +90,7 @@ public class JavaOnlyMap implements ReadableMap, WritableMap {
 
   @Override
   public Dynamic getDynamic(String name) {
-    return new DynamicFromMap(this, name);
+    return DynamicFromMap.create(this, name);
   }
 
   @Override

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

@@ -49,7 +49,7 @@ public class ReadableNativeArray extends NativeArray implements ReadableArray {
 
   @Override
   public Dynamic getDynamic(int index) {
-    return new DynamicFromArray(this, index);
+    return DynamicFromArray.create(this, index);
   }
 
   public ArrayList<Object> toArrayList() {

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

@@ -49,7 +49,7 @@ public class ReadableNativeMap extends NativeMap implements ReadableMap {
 
   @Override
   public Dynamic getDynamic(String name) {
-    return new DynamicFromMap(this, name);
+    return DynamicFromMap.create(this, name);
   }
 
   @Override