1 // Copyright 2013 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.
5 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
6 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
10 #include "base/basictypes.h"
11 #include "base/callback.h"
12 #include "base/gtest_prod_util.h"
13 #include "base/id_map.h"
14 #include "base/memory/ref_counted.h"
15 #include "base/memory/scoped_ptr.h"
16 #include "content/browser/service_worker/embedded_worker_instance.h"
17 #include "content/common/content_export.h"
18 #include "content/common/service_worker/service_worker_status_code.h"
24 class EmbeddedWorkerRegistry;
25 class ServiceWorkerRegistration;
26 struct ServiceWorkerFetchRequest;
28 // This class corresponds to a specific version of a ServiceWorker
29 // script for a given pattern. When a script is upgraded, there may be
30 // more than one ServiceWorkerVersion "running" at a time, but only
31 // one of them is active. This class connects the actual script with a
33 // Instances of this class are in one of two install states:
34 // - Pending: The script is in the process of being installed. There
35 // may be another active script running.
36 // - Active: The script is the only worker handling requests for the
37 // registration's pattern.
39 // In addition, a version has a running state (this is a rough
40 // sketch). Since a service worker can be stopped and started at any
41 // time, it will transition among these states multiple times during
43 // - Stopped: The script is not running
44 // - Starting: A request to fire an event against the version has been
45 // queued, but the worker is not yet
46 // loaded/initialized/etc.
47 // - Started: The worker is ready to receive events
48 // - Stopping: The worker is returning to the stopped state.
50 // The worker can "run" in both the Pending and the Active
51 // install states above. During the Pending state, the worker is only
52 // started in order to fire the 'install' and 'activate'
53 // events. During the Active state, it can receive other events such
56 // And finally, is_shutdown_ is detects the live-ness of the object
57 // itself. If the object is shut down, then it is in the process of
58 // being deleted from memory. This happens when a version is replaced
59 // as well as at browser shutdown.
60 class CONTENT_EXPORT ServiceWorkerVersion
61 : NON_EXPORTED_BASE(public base::RefCounted<ServiceWorkerVersion>),
62 public EmbeddedWorkerInstance::Observer {
64 typedef base::Callback<void(ServiceWorkerStatusCode)> StatusCallback;
65 typedef base::Callback<void(ServiceWorkerStatusCode,
66 const IPC::Message& message)> MessageCallback;
69 STOPPED = EmbeddedWorkerInstance::STOPPED,
70 STARTING = EmbeddedWorkerInstance::STARTING,
71 RUNNING = EmbeddedWorkerInstance::RUNNING,
72 STOPPING = EmbeddedWorkerInstance::STOPPING,
76 ServiceWorkerRegistration* registration,
77 EmbeddedWorkerRegistry* worker_registry,
80 int64 version_id() const { return version_id_; }
83 bool is_shutdown() const { return is_shutdown_; }
85 Status status() const {
86 return static_cast<Status>(embedded_worker_->status());
89 // Starts an embedded worker for this version.
90 // This returns OK (success) if the worker is already running.
91 void StartWorker(const StatusCallback& callback);
93 // Starts an embedded worker for this version.
94 // This returns OK (success) if the worker is already stopped.
95 void StopWorker(const StatusCallback& callback);
97 // Sends an IPC message to the worker.
98 // If the worker is not running this first tries to start it by
99 // calling StartWorker internally.
100 // |callback| can be null if the sender does not need to know if the
101 // message is successfully sent or not.
102 // (If the sender expects the receiver to respond please use
103 // SendMessageAndRegisterCallback instead)
104 void SendMessage(const IPC::Message& message, const StatusCallback& callback);
106 // Sends an IPC message to the worker and registers |callback| to
107 // be notified when a response message is received.
108 // The |callback| will be also fired with an error code if the worker
109 // is unexpectedly (being) stopped.
110 // If the worker is not running this first tries to start it by
111 // calling StartWorker internally.
112 void SendMessageAndRegisterCallback(const IPC::Message& message,
113 const MessageCallback& callback);
115 // Sends install event to the associated embedded worker and asynchronously
116 // calls |callback| when it errors out or it gets response from the worker
117 // to notify install completion.
118 // |active_version_embedded_worker_id| must be a valid positive ID
119 // if there's an active (previous) version running.
120 void DispatchInstallEvent(int active_version_embedded_worker_id,
121 const StatusCallback& callback);
123 // Sends fetch event to the associated embedded worker.
124 // This immediately returns false if the worker is not running
125 // or sending a message to the child process fails.
126 // TODO(kinuko): Make this take callback as well.
127 bool DispatchFetchEvent(const ServiceWorkerFetchRequest& request);
129 // These are expected to be called when a renderer process host for the
130 // same-origin as for this ServiceWorkerVersion is created. The added
131 // processes are used to run an in-renderer embedded worker.
132 void AddProcessToWorker(int process_id);
133 void RemoveProcessToWorker(int process_id);
135 EmbeddedWorkerInstance* embedded_worker() { return embedded_worker_.get(); }
137 // EmbeddedWorkerInstance::Observer overrides:
138 virtual void OnStarted() OVERRIDE;
139 virtual void OnStopped() OVERRIDE;
140 virtual void OnMessageReceived(int request_id,
141 const IPC::Message& message) OVERRIDE;
144 typedef ServiceWorkerVersion self;
145 friend class base::RefCounted<ServiceWorkerVersion>;
147 virtual ~ServiceWorkerVersion();
149 const int64 version_id_;
152 scoped_refptr<ServiceWorkerRegistration> registration_;
153 scoped_ptr<EmbeddedWorkerInstance> embedded_worker_;
155 // Pending callbacks.
156 std::vector<StatusCallback> start_callbacks_;
157 std::vector<StatusCallback> stop_callbacks_;
159 IDMap<MessageCallback, IDMapOwnPointer> message_callbacks_;
161 base::WeakPtrFactory<ServiceWorkerVersion> weak_factory_;
163 DISALLOW_COPY_AND_ASSIGN(ServiceWorkerVersion);
166 } // namespace content
168 #endif // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_