Initial implementation of Cronet Async API.

components/cronet/android/cronet_url_request_context_adapter.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_CRONET_ANDROID_CRONET_URL_REQUEST_CONTEXT_ADAPTER_H_
+#define COMPONENTS_CRONET_ANDROID_CRONET_URL_REQUEST_CONTEXT_ADAPTER_H_
+
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread.h"
+#include "net/base/net_log.h"
+#include "net/base/network_change_notifier.h"
+#include "net/url_request/url_request_context_getter.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace net {
+class NetLogLogger;
+class URLRequestContext;
+}  // namespace net
+
+namespace cronet {
+
+struct URLRequestContextConfig;
+
+// Fully configured |URLRequestContext|.
+class CronetURLRequestContextAdapter : public net::URLRequestContextGetter {
+ public:
+  class CronetURLRequestContextAdapterDelegate
+      : public base::RefCountedThreadSafe<
+            CronetURLRequestContextAdapterDelegate> {
+   public:
+    virtual void OnContextInitialized(
+        CronetURLRequestContextAdapter* context) = 0;

[xunjieli, 2014/10/17 00:31:35]

nit: s/context/context_adapter?

[mef, 2014/10/17 20:19:42]

Done.

+
+   protected:
+    friend class base::RefCountedThreadSafe<
+        CronetURLRequestContextAdapterDelegate>;
+
+    virtual ~CronetURLRequestContextAdapterDelegate() {}
+  };
+
+  explicit CronetURLRequestContextAdapter(
+      CronetURLRequestContextAdapterDelegate* delegate);
+  void Initialize(scoped_ptr<URLRequestContextConfig> config);
+
+  const std::string& GetUserAgent(const GURL& url) const;
+
+  // net::URLRequestContextGetter implementation:
+  net::URLRequestContext* GetURLRequestContext() override;
+  scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
+      const override;
+
+  void StartNetLogToFile(const std::string& file_name);
+  void StopNetLog();
+
+ private:
+  scoped_refptr<CronetURLRequestContextAdapterDelegate> delegate_;
+  scoped_ptr<net::URLRequestContext> context_;
+  std::string user_agent_;
+  base::Thread* network_thread_;
+  scoped_ptr<net::NetworkChangeNotifier> network_change_notifier_;
+  scoped_ptr<net::NetLogLogger> net_log_logger_;
+
+  virtual ~CronetURLRequestContextAdapter();
+
+  // Initializes |context_| on the Network thread.

[xunjieli, 2014/10/17 00:31:35]

The reason I suggested renaming is that I always confuse the |context| in the
argument with this member variable |context_|. The former is an adapter, while
the latter is context. But they have the same name.

[mef, 2014/10/17 20:19:42]

Acknowledged. Should we rename |context_| into |request_context_|?

[xunjieli, 2014/10/17 20:32:22]

I think that is fine. Since we only have one context, so it must be the request
context :)

+  void InitializeOnNetworkThread(scoped_ptr<URLRequestContextConfig> config);
+  void StartNetLogToFileOnNetworkThread(const std::string& file_name);
+  void StopNetLogOnNetworkThread();
+
+  DISALLOW_COPY_AND_ASSIGN(CronetURLRequestContextAdapter);
+};
+
+}  // namespace cronet
+
+#endif  // COMPONENTS_CRONET_ANDROID_CRONET_URL_REQUEST_CONTEXT_ADAPTER_H_