ObjectAlreadyConsumedException：接收地图已被消耗

Question

tl; dr
I try to get data of a WritableMap, in the same class and two times. I get Receiving map already consumed error and I couldn't overcome that issue.

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I've been developing a Native Module to use in my React-Native app.

I have 2 classes. One of them is MyModule class (is in MyModule.java file) and the other one is a Worker class (is in Worker.java file).

In addition Worker class has another class its inside that is called Work class. Work class offers two methods to do works and to get works status.

Worker class has a hash table called as mWorks . Worker class checks the incoming workName whether the work is already present or not in its constructor method. If the incoming work is already present, the work is assigned to public work variable.

When I try to call getState() and doWork() in my App (MyModule) I get the following error;

E/unknown:React( 5578): Exception in native call from JS
E/unknown:React( 5578): com.facebook.react.bridge.ObjectAlreadyConsumedException: Receiving map already consumed
E/unknown:React( 5578):         at com.facebook.react.bridge.WritableNativeMap.putNativeMap(Native Method)
E/unknown:React( 5578):         at com.facebook.react.bridge.WritableNativeMap.putMap(WritableNativeMap.java:44)

I guess , when I call getState() method the map data field is consumed. Then if I call doWork() I get the error. Because I call mWorker.work.getState() in both of getState() and doWork() .

Is there any chance to overcome this exception?

MyModule class have two methods as named getState() and doWork().

public class MyModule extends ReactContextBaseJavaModule {
    ...
    private Worker mWorker = null;
    ...
    public void getStatus(final String workName, final Callback successCallback) {
        mWorker = new Worker(workName);

        WritableMap response = new WritableNativeMap();
        response.putMap("workState", mWorker.work.getState());

        successCallback.invoke(response);
    }

    public void doWork(final String workName, final Callback successCallback) {
        mWorker = new Worker(workName);

        if(mWorker.work.doWork()) {
            successCallback.invoke(response);
            response.putMap("workState", mWorker.work.getState());
        } else {
            response.putMap("workState", mWorker.work.getState());
            response.putString("message", "An error has been occurred.");
            errorCallback.invoke(response);
        }

    }
}

Worker class has another class which is called Work.

public class Worker {
    ...
    public Work work;
    private Hashtable<String, Work> mWorks = new Hashtable<String, Work>();
    ...
    // CONSTRUCTOR
    public Worker () {
        Work work = null;

        if (this.mWorks.containsKey(pWorkName)) {
            Log.d(TAG, "Found an existing Work");
            work = this.mWorks.get(pWorkName);
        } else {
            Log.d(TAG, "Creating a new Work");
            work = new Work(pWorkName);
            this.mWorks.put(pWorkName, work);
        }
        this.work = work;
    }
    ...
    public class Work {
        ...
        public WritableMap getState()  {
            WritableMap result = new WritableNativeMap();

            if (this.isCompleted()) {
                result.putBoolean("Done", true);
            } else {
                result.putBoolean("Done", false);
            }

            return result;
        }

        public boolean doWork()  {
            // do something
            return aBoolValue;
        }
    }

}

Answer 1

The problem was response.putMap("workState", mWorker.work.getState()); line which is at the immediate after successCallback.invoke !

It had to before the callback invoke.