Adds a twin() method to V8Value

The twin() method will return a new Java object pointing at the same V8Value. Care is taken to ensure the same type is returned (V8Object, V8Function, V8Array). The twin will mimic any changes made to the original (since they are the same V8Objects), but can be released independently.
JessHolle · May 15, 2015 · b5b3226 · b5b3226
1 parent d588d5e
commit b5b3226
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Showing 8 changed files with 211 additions and 8 deletions.
diff --git a/jni/com_eclipsesource_v8_V8Impl.cpp b/jni/com_eclipsesource_v8_V8Impl.cpp
@@ -262,6 +262,14 @@ JNIEXPORT void JNICALL Java_com_eclipsesource_v8_V8__1initNewV8Object
   reinterpret_cast<V8Runtime*>(v8RuntimePtr)->objects[objectHandle]->Reset(reinterpret_cast<V8Runtime*>(v8RuntimePtr)->isolate, obj);
 }
 
+JNIEXPORT void JNICALL Java_com_eclipsesource_v8_V8__1createTwin
+  (JNIEnv *env, jobject, jlong v8RuntimePtr, jint objectHandle, jint twinObjectHandle) {
+  Isolate* isolate = SETUP(env, v8RuntimePtr, );
+  Handle<Object> obj = Local<Object>::New(isolate, *reinterpret_cast<V8Runtime*>(v8RuntimePtr)->objects[objectHandle]);
+  createPersistentContainer(reinterpret_cast<V8Runtime*>(v8RuntimePtr), twinObjectHandle);
+  reinterpret_cast<V8Runtime*>(v8RuntimePtr)->objects[twinObjectHandle]->Reset(reinterpret_cast<V8Runtime*>(v8RuntimePtr)->isolate, obj);
+}
+
 JNIEXPORT void JNICALL Java_com_eclipsesource_v8_V8__1initNewV8Array
 (JNIEnv *env, jobject, jlong v8RuntimePtr, jint arrayHandle) {
   Isolate* isolate = SETUP(env, v8RuntimePtr, );

diff --git a/jni/com_eclipsesource_v8_V8Impl.h b/jni/com_eclipsesource_v8_V8Impl.h
diff --git a/src/main/java/com/eclipsesource/v8/V8.java b/src/main/java/com/eclipsesource/v8/V8.java
@@ -183,6 +183,11 @@ public int executeIntegerScript(final String script, final String scriptName, fi
         return executeIntegerScript(v8RuntimePtr, script, scriptName, lineNumber);
     }
 
+    void createTwin(final V8Value value, final int twinObjectHandle) {
+        checkThread();
+        createTwin(v8RuntimePtr, value.getHandle(), twinObjectHandle);
+    }
+
     public double executeDoubleScript(final String script) {
         return executeDoubleScript(script, null, 0);
     }
@@ -483,6 +488,10 @@ protected void initNewV8Object(final long v8RuntimePtr, final int objectHandle)
         _initNewV8Object(v8RuntimePtr, objectHandle);
     }
 
+    protected void createTwin(final long v8RuntimePtr, final int objectHandle, final int twinObjectHandle) {
+        _createTwin(v8RuntimePtr, objectHandle, twinObjectHandle);
+    }
+
     protected int executeIntegerScript(final long v8RuntimePtr, final String script, final String scriptName, final int lineNumber) {
         return _executeIntegerScript(v8RuntimePtr, script, scriptName, lineNumber);
     }
@@ -741,6 +750,8 @@ protected void terminateExecution(final long v8RuntimePtr) {
 
     private native void _initNewV8Object(long v8RuntimePtr, int objectHandle);
 
+    private native void _createTwin(long v8RuntimePtr, int objectHandle, int twinObjectHandle);
+
     private native void _releaseRuntime(long v8RuntimePtr);
 
     private native long _createIsolate(String globalAlias);

diff --git a/src/main/java/com/eclipsesource/v8/V8Array.java b/src/main/java/com/eclipsesource/v8/V8Array.java
@@ -21,6 +21,15 @@ public V8Array(final V8 v8) {
         v8.checkThread();
     }
 
+    @Override
+    protected V8Value createTwin(final int newHandle) {
+        return new V8Array(v8, newHandle);
+    }
+
+    protected V8Array(final V8 v8, final int objectHandle) {
+        super(v8, objectHandle);
+    }
+
     @Override
     protected void initialize(final long runtimePtr, final int objectHandle) {
         v8.initNewV8Array(runtimePtr, objectHandle);

diff --git a/src/main/java/com/eclipsesource/v8/V8Function.java b/src/main/java/com/eclipsesource/v8/V8Function.java
@@ -16,6 +16,15 @@ protected V8Function(final V8 v8) {
         super(v8);
     }
 
+    protected V8Function(final V8 v8, final int objectHandle) {
+        super(v8, objectHandle);
+    }
+
+    @Override
+    protected V8Value createTwin(final int newHandle) {
+        return new V8Function(v8, newHandle);
+    }
+
     public Object call(final V8Object receiver, final V8Array parameters) {
         v8.checkThread();
         checkReleaesd();

diff --git a/src/main/java/com/eclipsesource/v8/V8Object.java b/src/main/java/com/eclipsesource/v8/V8Object.java
@@ -18,18 +18,18 @@ protected V8Object() {
 
     }
 
+    @Override
+    protected V8Value createTwin(final int newHandle) {
+        return new V8Object(v8, newHandle);
+    }
+
     protected V8Object(final V8 v8, final int objectHandle) {
-        if (v8 == null) {
-            this.v8 = (V8) this;
-        }
-        this.objectHandle = objectHandle;
-        released = false;
+        super(v8, objectHandle);
     }
 
     public V8Object(final V8 v8) {
-        this.v8 = v8;
+        super(v8);
         v8.checkThread();
-        objectHandle = v8ObjectInstanceCounter++;
         initialize(v8.getV8RuntimePtr(), objectHandle);
     }
 

diff --git a/src/main/java/com/eclipsesource/v8/V8Value.java b/src/main/java/com/eclipsesource/v8/V8Value.java
@@ -28,10 +28,26 @@ abstract public class V8Value {
     protected int           objectHandle;
     protected boolean       released                = true;
 
-    public V8Value() {
+    protected V8Value() {
         super();
     }
 
+    public V8Value(final V8 v8) {
+        this.v8 = v8;
+        objectHandle = v8ObjectInstanceCounter++;
+    }
+
+    protected V8Value(final V8 v8, final int objectHandle) {
+        if (v8 == null) {
+            this.v8 = (V8) this;
+        } else {
+            this.v8 = v8;
+            v8.addObjRef();
+        }
+        this.objectHandle = objectHandle;
+        released = false;
+    }
+
     protected void initialize(final long runtimePtr, final int objectHandle) {
         v8.initNewV8Object(runtimePtr, objectHandle);
         v8.addObjRef();
@@ -51,6 +67,19 @@ public V8 getRutime() {
         return v8;
     }
 
+    public V8Value twin() {
+        if (isUndefined()) {
+            return this;
+        }
+        v8.checkThread();
+        v8.checkReleaesd();
+        int twinHandle = v8ObjectInstanceCounter++;
+        v8.createTwin(this, twinHandle);
+        return createTwin(twinHandle);
+    }
+
+    protected abstract V8Value createTwin(int twinObjectHandle);
+
     public void release() {
         v8.checkThread();
         if ( !released ) {

diff --git a/src/test/java/com/eclipsesource/v8/V8ObjectTest.java b/src/test/java/com/eclipsesource/v8/V8ObjectTest.java
@@ -1041,4 +1041,133 @@ public void testToStringInCallback() {
         a.release();
     }
 
+    @Test
+    public void testV8ObjectTwinEqual() {
+        V8Object v8Object = new V8Object(v8);
+
+        V8Value twin = v8Object.twin();
+
+        assertNotSame(v8Object, twin);
+        assertTrue(v8Object.equals(twin));
+        assertTrue(twin.equals(v8Object));
+        v8Object.release();
+        twin.release();
+    }
+
+    @Test
+    public void testV8ObjectTwinSameValue() {
+        V8Object v8Object = new V8Object(v8);
+
+        V8Value twin = v8Object.twin();
+
+        assertNotSame(v8Object, twin);
+        assertTrue(v8Object.sameValue(twin));
+        assertTrue(twin.sameValue(v8Object));
+        v8Object.release();
+        twin.release();
+    }
+
+    @Test
+    public void testV8ObjectTwinStrictEquals() {
+        V8Object v8Object = new V8Object(v8);
+
+        V8Value twin = v8Object.twin();
+
+        assertNotSame(v8Object, twin);
+        assertTrue(v8Object.strictEquals(twin));
+        assertTrue(twin.strictEquals(v8Object));
+        v8Object.release();
+        twin.release();
+    }
+
+    @Test
+    public void testV8ObjectTwinSameHashCode() {
+        V8Object v8Object = new V8Object(v8);
+
+        V8Value twin = v8Object.twin();
+
+        assertEquals(v8Object.hashCode(), twin.hashCode());
+        v8Object.release();
+        twin.release();
+    }
+
+    @Test
+    public void testTwinIsObject() {
+        V8Object v8Object = new V8Object(v8);
+
+        V8Value twin = v8Object.twin();
+
+        assertTrue(twin instanceof V8Object);
+        v8Object.release();
+        twin.release();
+    }
+
+    @Test
+    public void testTwinIsArray() {
+        V8Object v8Object = new V8Array(v8);
+
+        V8Value twin = v8Object.twin();
+
+        assertTrue(twin instanceof V8Array);
+        v8Object.release();
+        twin.release();
+    }
+
+    @Test
+    public void testTwinIsFunction() {
+        v8.executeVoidScript("function add(x, y) {return x+y;}");
+        V8Object v8Object = v8.getObject("add");
+
+        V8Value twin = v8Object.twin();
+
+        assertTrue(twin instanceof V8Function);
+        v8Object.release();
+        twin.release();
+    }
+
+    @Test
+    public void testTwinIsUndefined() {
+        V8Object v8Object = (V8Object) V8.getUndefined();
+
+        V8Value twin = v8Object.twin();
+
+        assertTrue(twin.isUndefined());
+        v8Object.release();
+        twin.release();
+    }
+
+    @Test
+    public void testReleaseTwinDoesNotReleaseOriginal() {
+        V8Object v8Object = new V8Object(v8);
+        V8Value twin = v8Object.twin();
+
+        twin.release();
+
+        assertFalse(v8Object.isReleased());
+        v8Object.release();
+    }
+
+    @Test
+    public void testReleaseObjectDoesNotReleaseTwin() {
+        V8Object v8Object = new V8Object(v8);
+        V8Value twin = v8Object.twin();
+
+        v8Object.release();
+
+        assertFalse(twin.isReleased());
+        twin.release();
+    }
+
+    @Test
+    public void testTwinMimicsObject() {
+        V8Object v8Object = new V8Object(v8);
+        V8Value twin = v8Object.twin();
+
+        v8Object.add("foo", "bar");
+
+        assertEquals("bar", ((V8Object) twin).getString("foo"));
+        v8Object.release();
+        twin.release();
+    }
+
 }