优化：DumpObjects 日志输出到指定文件中方便查看

Author: HarlonWang

native/cpp/quickjs_context_jni.cpp

@@ -237,7 +237,26 @@ Java_com_whl_quickjs_wrapper_QuickJSContext_dumpMemoryUsage(JNIEnv *env, jclass
 }
 extern "C"
 JNIEXPORT void JNICALL
-Java_com_whl_quickjs_wrapper_QuickJSContext_dumpObjects(JNIEnv *env, jobject thiz, jlong runtime) {
+Java_com_whl_quickjs_wrapper_QuickJSContext_dumpObjects(JNIEnv *env, jobject thiz, jlong runtime,
+                                                        jstring file_name) {
     auto *rt = reinterpret_cast<JSRuntime*>(runtime);
-    JS_DumpObjects(rt);
+
+    if (file_name == nullptr) {
+        JS_DumpObjects(rt);
+    } else {
+        const char *path = env->GetStringUTFChars(file_name, JNI_FALSE);
+        // 这里重定向打印日志到指定文件，方便查看。
+        // todo 打印完需要再恢复到控制台打印，参考：https://cloud.tencent.com/developer/article/1544633
+        auto file = freopen(path, "w", stdout);
+        env->ReleaseStringUTFChars(file_name, path);
+        if (!file) {
+            env->ThrowNew(env->FindClass("java/lang/NullPointerException"), "File cannot be null");
+            return;
+        }
+
+        JS_DumpObjects(rt);
+
+        fclose(file);
+    }
+
 }

wrapper-android/src/androidTest/java/com/whl/quickjs/wrapper/QuickJSTest.java

@@ -939,6 +939,21 @@ public void dumpMemoryUsageTest() {
         context.destroy();
     }
 
+    @Test
+    public void dumpObjectsTest() {
+        QuickJSContext context = createContext();
+        context.evaluate("var testDumpObject = {data: 'I am test data'};");
+        Context androidContext = ApplicationProvider.getApplicationContext();
+        File file = new File(androidContext.getCacheDir(), "dump_objects.txt");
+        try {
+            file.createNewFile();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        context.dumpObjects(file);
+        context.destroy();
+    }
+
     @Test
     public void testGetNativeFuncName() {
         QuickJSContext context = createContext();

wrapper-java/src/main/java/com/whl/quickjs/wrapper/QuickJSContext.java

@@ -40,9 +40,17 @@ public void dumpMemoryUsage() {
         dumpMemoryUsage(runtime, null);
     }
 
+    public void dumpObjects(File target) {
+        if (target == null || !target.exists()) {
+            return;
+        }
+
+        dumpObjects(runtime, target.getAbsolutePath());
+    }
+
     // will use stdout to print.
     public void dumpObjects() {
-        dumpObjects(runtime);
+        dumpObjects(runtime, null);
     }
 
     private final long runtime;
@@ -316,7 +324,7 @@ public void throwJSException(String error) {
     private native void runGC(long runtime);
     private native void setMemoryLimit(long runtime, int size);
     private native void dumpMemoryUsage(long runtime, String fileName);
-    private native void dumpObjects(long runtime);
+    private native void dumpObjects(long runtime, String fileName);
 
     // context
     private native long createContext(long runtime);