private ReactBridge initializeBridge( JavaScriptExecutor jsExecutor, JavaScriptModulesConfig jsModulesConfig) { mReactQueueConfiguration.getJSQueueThread().assertIsOnThread(); Assertions.assertCondition(mBridge == null, "initializeBridge should be called once"); Systrace.beginSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "ReactBridgeCtor"); ReactBridge bridge; try { bridge = new ReactBridge( jsExecutor, new NativeModulesReactCallback(), mReactQueueConfiguration.getNativeModulesQueueThread()); mMainExecutorToken = bridge.getMainExecutorToken(); } finally { Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE); } Systrace.beginSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "setBatchedBridgeConfig"); try { bridge.setGlobalVariable( "__fbBatchedBridgeConfig", buildModulesConfigJSONProperty(mJavaRegistry, jsModulesConfig)); bridge.setGlobalVariable( "__RCTProfileIsProfiling", Systrace.isTracing(Systrace.TRACE_TAG_REACT_APPS) ? "true" : "false"); } finally { Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE); } mJavaRegistry.notifyReactBridgeInitialized(bridge); return bridge; }