content/browser/service_worker/service_worker_handle.h

   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 CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_HANDLE_H_
   6 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_HANDLE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "content/browser/service_worker/service_worker_version.h"
  13 #include "content/common/content_export.h"
  14 #include "content/common/service_worker/service_worker_types.h"
  15
  16 namespace IPC {
  17 class Sender;
  18 }
  19
  20 namespace content {
  21
  22 class ServiceWorkerContextCore;
  23
  24 // Roughly corresponds to one ServiceWorker object in the renderer process
  25 // (WebServiceWorkerImpl).
  26 // Has references to the corresponding ServiceWorkerVersion in order to ensure
  27 // that the version is alive while this handle is around.
  28 class CONTENT_EXPORT ServiceWorkerHandle
  29     : NON_EXPORTED_BASE(public ServiceWorkerVersion::Listener) {
  30  public:
  31   // Creates a handle for a live version. This may return nullptr if any of
  32   // |context|, |provider_host| and |version| is nullptr.
  33   static scoped_ptr<ServiceWorkerHandle> Create(
  34       base::WeakPtr<ServiceWorkerContextCore> context,
  35       base::WeakPtr<ServiceWorkerProviderHost> provider_host,
  36       ServiceWorkerVersion* version);
  37
  38   ServiceWorkerHandle(base::WeakPtr<ServiceWorkerContextCore> context,
  39                       base::WeakPtr<ServiceWorkerProviderHost> provider_host,
  40                       ServiceWorkerVersion* version);
  41   ~ServiceWorkerHandle() override;
  42
  43   // ServiceWorkerVersion::Listener overrides.
  44   void OnVersionStateChanged(ServiceWorkerVersion* version) override;
  45
  46   ServiceWorkerObjectInfo GetObjectInfo();
  47
  48   int handle_id() const { return handle_id_; }
  49   ServiceWorkerVersion* version() { return version_.get(); }
  50
  51   bool HasNoRefCount() const { return ref_count_ <= 0; }
  52   void IncrementRefCount();
  53   void DecrementRefCount();
  54
  55  private:
  56   base::WeakPtr<ServiceWorkerContextCore> context_;
  57   base::WeakPtr<ServiceWorkerProviderHost> provider_host_;
  58   const int handle_id_;
  59   int ref_count_;  // Created with 1.
  60   scoped_refptr<ServiceWorkerVersion> version_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerHandle);
  63 };
  64
  65 }  // namespace content
  66
  67 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_HANDLE_H_