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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef RespondWithObserver_h
      6 #define RespondWithObserver_h
      7 
      8 #include "core/dom/ContextLifecycleObserver.h"
      9 #include "platform/heap/Handle.h"
     10 #include "wtf/Forward.h"
     11 #include "wtf/RefCounted.h"
     12 
     13 namespace blink {
     14 
     15 class ExceptionState;
     16 class ExecutionContext;
     17 class Response;
     18 class ScriptState;
     19 class ScriptValue;
     20 
     21 // This class observes the service worker's handling of a FetchEvent and
     22 // notifies the client.
     23 class RespondWithObserver FINAL : public GarbageCollectedFinalized<RespondWithObserver>, public ContextLifecycleObserver {
     24 public:
     25     static RespondWithObserver* create(ExecutionContext*, int eventID);
     26 
     27     virtual void contextDestroyed() OVERRIDE;
     28 
     29     void didDispatchEvent();
     30 
     31     // Observes the promise and delays calling didHandleFetchEvent() until the
     32     // given promise is resolved or rejected.
     33     void respondWith(ScriptState*, const ScriptValue&, ExceptionState&);
     34 
     35     void responseWasRejected();
     36     void responseWasFulfilled(const ScriptValue&);
     37 
     38     void trace(Visitor*) { }
     39 
     40 private:
     41     class ThenFunction;
     42 
     43     RespondWithObserver(ExecutionContext*, int eventID);
     44 
     45     int m_eventID;
     46 
     47     enum State { Initial, Pending, Done };
     48     State m_state;
     49 };
     50 
     51 } // namespace blink
     52 
     53 #endif // RespondWithObserver_h
     54