start debug server only on when using chrome debug

react-native/android/src/main/java/io/realm/react/RealmReactModule.java

@@ -9,7 +9,6 @@ import com.facebook.react.bridge.ReactContextBaseJavaModule;
 import com.facebook.soloader.SoLoader;
 
 import java.io.IOException;
-import java.lang.IllegalStateException;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
@@ -56,13 +55,16 @@ public class RealmReactModule extends ReactContextBaseJavaModule {
 
     @Override
     public Map<String, Object> getConstants() {
-        // FIXME: Only start web server when in Chrome debug mode!
+        if (!isContextInjected()) {
+            startWebServer();
+        }
         startWebServer();
         return Collections.EMPTY_MAP;
     }
 
     @Override
     public void onCatalystInstanceDestroy() {
+        clearFlag();
         stopWebServer();
     }
 
@@ -127,6 +129,12 @@ public class RealmReactModule extends ReactContextBaseJavaModule {
         }
     }
 
+    // return true if the Realm API was injected (return false when running in Chrome Debug)
+    private native boolean isContextInjected();
+
+    // clear the flag set when injecting Realm API
+    private native void clearFlag();
+
     // fileDir: path of the internal storage of the application
     private native void setDefaultRealmFileDirectory(String fileDir);
 

src/android/io_realm_react_RealmReactModule.cpp

@@ -10,6 +10,7 @@
 #include "platform.hpp"
 
 static realm_js::RPCServer *s_rpc_server;
+extern bool realmContextInjected;
 
 JNIEXPORT void JNICALL Java_io_realm_react_RealmReactModule_setDefaultRealmFileDirectory
   (JNIEnv *env, jclass, jstring fileDir)
@@ -38,7 +39,6 @@ JNIEXPORT jlong JNICALL Java_io_realm_react_RealmReactModule_setupChromeDebugMod
 JNIEXPORT jstring JNICALL Java_io_realm_react_RealmReactModule_processChromeDebugCommand
   (JNIEnv *env, jclass, jstring chrome_cmd, jstring chrome_args)
 {
-    __android_log_print(ANDROID_LOG_VERBOSE, "JSRealm", "processChromeDebugCommand");
     const char* cmd = env->GetStringUTFChars(chrome_cmd, NULL);
     const char* args = env->GetStringUTFChars(chrome_args, NULL);
     realm_js::json json = realm_js::json::parse(args);
@@ -47,3 +47,16 @@ JNIEXPORT jstring JNICALL Java_io_realm_react_RealmReactModule_processChromeDebu
     env->ReleaseStringUTFChars(chrome_args, args);
     return env->NewStringUTF(response.dump().c_str());
 }
+
+JNIEXPORT jboolean JNICALL Java_io_realm_react_RealmReactModule_isContextInjected
+    (JNIEnv *env, jclass)
+    {
+      return realmContextInjected;
+    }
+
+JNIEXPORT void JNICALL Java_io_realm_react_RealmReactModule_clearFlag
+  (JNIEnv *env, jclass)
+  {
+    realmContextInjected = false;//might not be needed
+
+  }

src/android/io_realm_react_RealmReactModule.h

@@ -29,6 +29,21 @@ JNIEXPORT jlong JNICALL Java_io_realm_react_RealmReactModule_setupChromeDebugMod
 JNIEXPORT jstring JNICALL Java_io_realm_react_RealmReactModule_processChromeDebugCommand
   (JNIEnv *, jclass, jstring, jstring);
 
+/*
+ * Class:     io_realm_react_RealmReactModule
+ * Method:    isContextInjected
+ */
+JNIEXPORT jboolean JNICALL Java_io_realm_react_RealmReactModule_isContextInjected
+    (JNIEnv *, jclass);
+
+/*
+ * Class:     io_realm_react_RealmReactModule
+ * Method:    clearFlag
+ */
+JNIEXPORT void JNICALL Java_io_realm_react_RealmReactModule_clearFlag
+  (JNIEnv *, jclass);
+
+
 #ifdef __cplusplus
 }
 #endif

src/android/jsc_override.cpp

@@ -18,6 +18,8 @@
 #define HOOK_SIZE 5
 #endif
 
+bool realmContextInjected;
+
 static void swap_function() __attribute__((constructor));
 
 static JSGlobalContextRef create_context(JSContextGroupRef group, JSClassRef global_class)
@@ -36,6 +38,7 @@ static JSGlobalContextRef create_context(JSContextGroupRef group, JSClassRef glo
     realm::Realm::s_global_cache.clear();
 
     RJSInitializeInContext(ctx);
+    realmContextInjected = true;
     return ctx;
 }