Initial implementation of Cronet Async API.

components/cronet/android/cronet_url_request.cc

+// 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.
+
+#include "components/cronet/android/cronet_url_request.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/macros.h"
+#include "components/cronet/android/cronet_url_request_adapter.h"
+#include "components/cronet/android/cronet_url_request_context_adapter.h"
+#include "jni/CronetUrlRequest_jni.h"
+#include "net/base/net_errors.h"
+#include "net/base/request_priority.h"
+#include "net/http/http_response_headers.h"
+
+using base::android::ConvertUTF8ToJavaString;
+
+namespace cronet {
+namespace {
+
+net::RequestPriority ConvertRequestPriority(jint request_priority) {
+  switch (request_priority) {
+    case CRONET_REQUEST_PRIORITY_IDLE:
+      return net::IDLE;
+    case CRONET_REQUEST_PRIORITY_LOWEST:
+      return net::LOWEST;
+    case CRONET_REQUEST_PRIORITY_LOW:
+      return net::LOW;
+    case CRONET_REQUEST_PRIORITY_MEDIUM:
+      return net::MEDIUM;
+    case CRONET_REQUEST_PRIORITY_HIGHEST:
+      return net::HIGHEST;
+    default:
+      return net::LOWEST;
+  }
+}
+
+// A delegate of CronetURLRequestAdapter that delivers callbacks to the Java
+// layer. Always called on Network Thread.
+class JniCronetURLRequestAdapterDelegate
+    : public CronetURLRequestAdapter::CronetURLRequestAdapterDelegate {
+ public:
+  JniCronetURLRequestAdapterDelegate(JNIEnv* env, jobject owner) {
+    owner_ = env->NewGlobalRef(owner);
+  }
+
+  void OnRedirect(CronetURLRequestAdapter* request,
+                  const GURL& newLocation) override {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    cronet::Java_CronetUrlRequest_onRedirect(
+        env,
+        owner_,
+        ConvertUTF8ToJavaString(env, newLocation.spec()).Release());
+  }
+
+  void OnResponseStarted(CronetURLRequestAdapter* request) override {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    cronet::Java_CronetUrlRequest_onResponseStarted(env, owner_);
+  }
+
+  void OnBytesRead(CronetURLRequestAdapter* request, int bytes_read) override {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    base::android::ScopedJavaLocalRef<jobject> java_buffer(
+        env, env->NewDirectByteBuffer(request->Data(), bytes_read));
+    cronet::Java_CronetUrlRequest_onDataReceived(
+        env, owner_, java_buffer.obj());
+  }
+
+  void OnRequestFinished(CronetURLRequestAdapter* request,
+                         bool canceled) override {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    cronet::Java_CronetUrlRequest_onComplete(
+        env, owner_, canceled ? JNI_TRUE : JNI_FALSE);
+  }
+
+  void OnError(CronetURLRequestAdapter* request, int error) override {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    cronet::Java_CronetUrlRequest_onError(env, owner_, error);
+  }
+
+ protected:
+  virtual ~JniCronetURLRequestAdapterDelegate() {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    env->DeleteGlobalRef(owner_);
+  }
+
+ private:
+  jobject owner_;
+
+  DISALLOW_COPY_AND_ASSIGN(JniCronetURLRequestAdapterDelegate);
+};
+
+}  // namespace
+
+// Explicitly register static JNI functions.
+bool CronetUrlRequestRegisterJni(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+static jlong CreateRequestAdapter(JNIEnv* env,
+                                  jobject object,
+                                  jlong url_request_context_adapter,

[xunjieli, 2014/10/17 00:31:34]

nit: I learned from eroman@, that for arguments of native functions called by
Java side, we should use a "j" prefix. For instance, here we will have jenv,
jobject, jurl_request_context_adapter, jurl_string, etc to emphasize the fact
these arguments are passed from the java side. 

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

Ah, nice to know! Done.

+                                  jstring url_string,
+                                  jint priority) {
+  CronetURLRequestContextAdapter* context =
+      reinterpret_cast<CronetURLRequestContextAdapter*>(
+          url_request_context_adapter);
+  DCHECK(context != NULL);
+
+  GURL url(base::android::ConvertJavaStringToUTF8(env, url_string));
+
+  VLOG(1) << "New chromium network request: " << url.possibly_invalid_spec();
+
+  CronetURLRequestAdapter* adapter = new CronetURLRequestAdapter(
+      context,
+      new JniCronetURLRequestAdapterDelegate(env, object),
+      url,
+      ConvertRequestPriority(priority));
+
+  return reinterpret_cast<jlong>(adapter);

[xunjieli, 2014/10/17 00:31:34]

nit: I find the naming is a little confusing. Here we have
CronetURLRequestAdapter as "adapter", later in the code we have it as "request".
What about we rename those to "request_adapter"? Then, there won't be any
ambiguity. Also I find the fact that we call the ContextAdapter by "context" a
little misleading too. What about renaming to "context_adapter"?

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

sgtm, done.

+}
+
+static void AddHeader(JNIEnv* env,
+                      jobject object,
+                      jlong url_request_adapter,
+                      jstring name,
+                      jstring value) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  std::string name_string(base::android::ConvertJavaStringToUTF8(env, name));
+  std::string value_string(base::android::ConvertJavaStringToUTF8(env, value));
+  DCHECK(request);
+  DCHECK(!request->IsOnNetworkThread());
+  request->AddRequestHeader(name_string, value_string);
+}
+
+static void SetHttpMethod(JNIEnv* env,
+                          jobject object,
+                          jlong url_request_adapter,
+                          jstring method) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  std::string method_string(
+      base::android::ConvertJavaStringToUTF8(env, method));
+  DCHECK(request);
+  DCHECK(!request->IsOnNetworkThread());
+  request->SetMethod(method_string);
+}
+
+static void Start(JNIEnv* env, jobject object, jlong url_request_adapter) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  DCHECK(request);
+  DCHECK(!request->IsOnNetworkThread());
+  request->Start();
+}
+
+static void DestroyRequestAdapter(JNIEnv* env,
+                                  jobject object,
+                                  jlong url_request_adapter) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  DCHECK(request);
+  DCHECK(!request->IsOnNetworkThread());
+  request->Destroy();
+}
+
+static void Cancel(JNIEnv* env, jobject object, jlong url_request_adapter) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  DCHECK(request);
+  DCHECK(!request->IsOnNetworkThread());
+  request->Cancel();
+}
+
+static void ReceiveData(JNIEnv* env,
+                        jobject jcaller,
+                        jlong url_request_adapter) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  DCHECK(request);
+  DCHECK(!request->IsOnNetworkThread());
+  request->ReadData();
+}
+
+static void FollowDeferredRedirect(JNIEnv* env,
+                                   jobject jcaller,
+                                   jlong url_request_adapter) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  DCHECK(request);
+  DCHECK(!request->IsOnNetworkThread());
+  request->FollowDeferredRedirect();
+}
+
+static jint GetHttpStatusCode(JNIEnv* env,
+                              jobject object,
+                              jlong url_request_adapter) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  DCHECK(request);
+  DCHECK(request->IsOnNetworkThread());
+  return request->http_status_code();
+}
+
+static void GetAllHeaders(JNIEnv* env,
+                          jobject object,
+                          jlong url_request_adapter,
+                          jobject headersMap) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  DCHECK(request);
+  DCHECK(request->IsOnNetworkThread());
+
+  net::HttpResponseHeaders* headers = request->GetResponseHeaders();
+  if (headers == NULL)

[xunjieli, 2014/10/17 00:31:34]

nit: I think it is recommended for new code, nullptr should be used in place of
NULL. http://chromium-cpp.appspot.com/

[mef, 2014/10/17 20:19:41]

Done.

+    return;
+
+  void* iter = NULL;
+  std::string header_name;
+  std::string header_value;
+  while (headers->EnumerateHeaderLines(&iter, &header_name, &header_value)) {
+    ScopedJavaLocalRef<jstring> name =
+        ConvertUTF8ToJavaString(env, header_name);
+    ScopedJavaLocalRef<jstring> value =
+        ConvertUTF8ToJavaString(env, header_value);
+    Java_CronetUrlRequest_onAppendResponseHeader(
+        env, object, headersMap, name.Release(), value.Release());
+  }
+
+  // Some implementations (notably HttpURLConnection) include a mapping for the
+  // null key; in HTTP's case, this maps to the HTTP status line.
+  ScopedJavaLocalRef<jstring> status_line =
+      ConvertUTF8ToJavaString(env, headers->GetStatusLine());
+  Java_CronetUrlRequest_onAppendResponseHeader(
+      env, object, headersMap, NULL, status_line.Release());
+}
+
+static jstring GetNegotiatedProtocol(JNIEnv* env,
+                                     jobject object,
+                                     jlong url_request_adapter) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  DCHECK(request);
+  DCHECK(request->IsOnNetworkThread());
+  std::string negotiated_protocol = request->GetNegotiatedProtocol();
+  return ConvertUTF8ToJavaString(env, negotiated_protocol.c_str()).Release();
+}
+
+static jboolean GetWasCached(JNIEnv* env,
+                             jobject jcaller,
+                             jlong url_request_adapter) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  DCHECK(request);
+  DCHECK(request->IsOnNetworkThread());
+  return request->GetWasCached() ? JNI_TRUE : JNI_FALSE;
+}
+
+static jlong GetTotalReceivedBytes(JNIEnv* env,
+                                   jobject jcaller,
+                                   jlong url_request_adapter) {
+  CronetURLRequestAdapter* request =
+      reinterpret_cast<CronetURLRequestAdapter*>(url_request_adapter);
+  DCHECK(request);
+  DCHECK(request->IsOnNetworkThread());
+  return request->GetTotalReceivedBytes();
+}
+
+}  // namespace cronet