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.
5 #ifndef COMPONENTS_TRANSLATE_CONTENT_RENDERER_RENDERER_CLD_DATA_PROVIDER_H_
6 #define COMPONENTS_TRANSLATE_CONTENT_RENDERER_RENDERER_CLD_DATA_PROVIDER_H_
8 #include "base/callback.h"
9 #include "ipc/ipc_listener.h"
16 class RenderViewObserver;
21 // Renderer-side interface responsible for providing CLD data.
22 // The implementation must be paired with a browser-side implementation of
23 // the BrowserCldDataProvider class:
25 // components/translate/content/browser/browser_cld_data_provider.h
27 // ... and the glue between them is typically a pair of request/response IPC
28 // messages using the CldDataProviderMsgStart IPCMessageStart enumerated
29 // constant from ipc_message_start.h
30 class RendererCldDataProvider : public IPC::Listener {
32 ~RendererCldDataProvider() override {}
34 // (Inherited from IPC::Listener)
35 // If the specified message is a response for CLD data, attempts to
36 // initialize CLD2 and returns true in all cases. If initialization is
37 // successful and a callback has been configured via
38 // SetCldAvailableCallback(...), that callback is invoked from the message
40 // This method is defined as virtual in order to force the implementation to
41 // define the specific IPC message(s) that it handles.
42 virtual bool OnMessageReceived(const IPC::Message&) = 0;
44 // Invoked by the renderer process to request that CLD data be obtained and
45 // that CLD be initialized with it. The implementation is expected to
46 // communicate with the paired BrowserCldDataProvider implementation on the
48 // This method must be invoked on the message loop thread.
49 virtual void SendCldDataRequest() = 0;
51 // Convenience method that tracks whether or not CLD data is available.
52 // This method can be used in the absence of a callback (i.e., if the caller
53 // wants a simple way to check the state of CLD data availability without
54 // keeping a separate boolean flag tripped by a callback).
55 virtual bool IsCldDataAvailable() = 0;
57 // Sets a callback that will be invoked when CLD data is successfully
58 // obtained from the paired BrowserCldDataProvider implementation on the
59 // browser side, after CLD has been successfully initialized.
60 // Both the initialization of CLD2 as well as the invocation of the callback
61 // must happen on the message loop thread.
62 virtual void SetCldAvailableCallback(base::Callback<void(void)>) = 0;
65 // Static factory function defined by the implementation that produces a new
66 // provider for the specified render view host.
67 RendererCldDataProvider* CreateRendererCldDataProviderFor(
68 content::RenderViewObserver*);
70 } // namespace translate
72 #endif // COMPONENTS_TRANSLATE_CONTENT_RENDERER_RENDERER_CLD_DATAP_PROVIDER_H_