GWT HashMap.put() 不向 HashMap 添加数据

Question

I have a game created in LibGDX that uses GWT to build an HTML5 version. I've got a hashmap that I use for logging purchases and some purchases were being processed multiple times. Looking into it I discovered it's because they weren't being added to the hashmap. The logic that adds processes to the hashmap is as follows (and works fine on Desktop, iOS and Android versions):

public void updatePurchase(String orderNo, UserPurchase purchase) {
    Gdx.app.log("Double Purchase", "In updatePurchase " + orderNo);

    if (StringUtils.isNullOrEmpty(orderNo) || purchase == null) return;
    Gdx.app.log("Double Purchase", "1");

    synchronized (this) {
        Gdx.app.log("Double Purchase", "2");
        UserPurchase existingPurchase = purchases.get(orderNo);
        Gdx.app.log("Double Purchase", "3 " + (existingPurchase != null));
        if (existingPurchase == null) {
            Gdx.app.log("Double Purchase", "4 " + purchases.containsKey(orderNo));
            purchases.put(orderNo, purchase);
            Gdx.app.log("Double Purchase", "5 " + purchases.containsKey(orderNo));
            setUpdated();
        } else {
            Gdx.app.log("Double Purchase", "6");
            if (existingPurchase.status == UserPurchase.STATUS_NEEDS_PROCESSING && purchase.status == UserPurchase.STATUS_PROCESSED) {
                Gdx.app.log("Double Purchase", "7");
                existingPurchase.status = UserPurchase.STATUS_PROCESSED;
                Gdx.app.log("Double Purchase", "8");
                setUpdated();
            }
        }
    }

    Gdx.app.log("Double Purchase", "Leave updatePurchase " + orderNo);
}

This produces the following output

GWT: WBLOG: Double Purchase: In updatePurchase 787349198062445
GWT: WBLOG: Double Purchase: 1
GWT: WBLOG: Double Purchase: 2
GWT: WBLOG: Double Purchase: 3 false
GWT: WBLOG: Double Purchase: 4 false
GWT: WBLOG: Double Purchase: 5 false
GWT: WBLOG: Double Purchase: Leave updatePurchase 787349198062445

Specifically note log lines 4 and 5, the hashmap does not contain the key orderNo . I then call put and on the next line the hashmap still doesn't contain the key orderNo .

This one really has me stumped. I use hashmaps all over the game and this is the only one that isn't working as expected. There are no errors reported in the console and nothing else unexpected appears to be happening.

Edit

I decided to try this:

        while (!purchases.containsKey(orderNo)) {
            Gdx.app.log("Double Purchase", "Trying to add purchase " + count++);
            purchases.put(orderNo, purchase);
        }

It just gets stuck in an infinite loop. It's a very stubborn HashMap !

Edit

Next interesting point. The String that is used for orderNo is returned from the Facebook SDK as part of a JavaScriptObject . The code for this is below:

public class PurchaseResponse extends JavaScriptObject {
    protected PurchaseResponse() {
    }

    public final native String getPaymentId() /*-{
        return this.payment_id;
    }-*/;

    public final native double getAmount() /*-{
        return this.amount;
    }-*/;

    public final native String getCurrency() /*-{
        return this.currency;
    }-*/;

    public final native int getQuantity() /*-{
        return this.quantity;
    }-*/;

    public final native String getRequestId() /*-{
        return this.request_id;
    }-*/;

    public final native String getStatus() /*-{
        return this.status;
    }-*/;

    public final native String getSignedRequest() /*-{
        return this.signed_request;
    }-*/;
}

I get an exception when trying to do indexOf() on this this string with the message that the indexOf() method doesn't exist. indexOf() does exist and works perfectly well in GWT on normal Strings. What's special about this String? I've tried doing new String(orderNo) and the new String doesn't work as expected either.

Answer 1

Worked it out! According the Facebook example the JSON response is as follows:

{
  payment_id: "495869257196092",
  amount: "5.00",
  currency: "USD",
  quantity: "1", 
  request_id: "60046727",
  status: "completed", 
  signed_request: "7QYHzKqKByA7fjiqJUh2bxFvEdqdvn0n_y1zYiyN6tg.eyJhbGCJxdWFudGl0eSI6IjEiLCJzdGF0dXMiOiJjb21wbGV0ZWQifQ"
}

But on inspecting the actual JSON response it's this:

{  
   "payment_id":795448840585614,
   "amount":"0.79",
   "currency":"GBP",
   "quantity":"1",
   "request_id":"xxxx",
   "status":"completed",
   "signed_request":"xxx"
}

Note the crucial difference. payment_id is a numeric value and not a String hence the missing functions and the fact that it wasn't performing as a String should.