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 WebServiceWorker object in the renderer process.
  25 //
  26 // The renderer process maintains the reference count by owning a
  27 // ServiceWorkerHandleReference for each reference it has to the service worker
  28 // object. ServiceWorkerHandleReference creation and destruction sends an IPC to
  29 // the browser process, which adjusts the ServiceWorkerHandle refcount.
  30 //
  31 // Has references to the corresponding ServiceWorkerVersion in order to ensure
  32 // that the version is alive while this handle is around.
  33 class CONTENT_EXPORT ServiceWorkerHandle
  34     : NON_EXPORTED_BASE(public ServiceWorkerVersion::Listener) {
  35  public:
  36   // Creates a handle for a live version. This may return nullptr if any of
  37   // |context|, |provider_host| and |version| is nullptr.
  38   static scoped_ptr<ServiceWorkerHandle> Create(
  39       base::WeakPtr<ServiceWorkerContextCore> context,
  40       base::WeakPtr<ServiceWorkerProviderHost> provider_host,
  41       ServiceWorkerVersion* version);
  42
  43   ServiceWorkerHandle(base::WeakPtr<ServiceWorkerContextCore> context,
  44                       base::WeakPtr<ServiceWorkerProviderHost> provider_host,
  45                       ServiceWorkerVersion* version);
  46   ~ServiceWorkerHandle() override;
  47
  48   // ServiceWorkerVersion::Listener overrides.
  49   void OnVersionStateChanged(ServiceWorkerVersion* version) override;
  50
  51   ServiceWorkerObjectInfo GetObjectInfo();
  52
  53   int provider_id() const { return provider_id_; }
  54   int handle_id() const { return handle_id_; }
  55   ServiceWorkerVersion* version() { return version_.get(); }
  56
  57   bool HasNoRefCount() const { return ref_count_ <= 0; }
  58   void IncrementRefCount();
  59   void DecrementRefCount();
  60
  61  private:
  62   base::WeakPtr<ServiceWorkerContextCore> context_;
  63   base::WeakPtr<ServiceWorkerProviderHost> provider_host_;
  64   const int provider_id_;
  65   const int handle_id_;
  66   int ref_count_;  // Created with 1.
  67   scoped_refptr<ServiceWorkerVersion> version_;
  68
  69   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerHandle);
  70 };
  71
  72 }  // namespace content
  73
  74 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_HANDLE_H_