Initial implementation of CronetBidirectionalStream.

components/cronet/android/cronet_bidirectional_stream_adapter.h

Index: components/cronet/android/cronet_bidirectional_stream_adapter.h
diff --git a/components/cronet/android/cronet_bidirectional_stream_adapter.h b/components/cronet/android/cronet_bidirectional_stream_adapter.h
new file mode 100644
index 0000000000000000000000000000000000000000..44833bc4f7a7387a3ddbcf827dbd61cd39786a7b
--- /dev/null
+++ b/components/cronet/android/cronet_bidirectional_stream_adapter.h
@@ -0,0 +1,127 @@
+// Copyright 2015 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_BIDIRECTIONAL_STREAM_ADAPTER_H_
+#define COMPONENTS_CRONET_ANDROID_CRONET_BIDIRECTIONAL_STREAM_ADAPTER_H_
+
+#include <jni.h>
+#include <string>
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_array.h"
+#include "base/android/jni_string.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/request_priority.h"
+#include "net/http/bidirectional_stream.h"
+#include "url/gurl.h"
+
+namespace net {
+class BidirectionalStreamRequestInfo;
+class SpdyHeaderBlock;
+}  // namespace net
+
+using base::android::JavaParamRef;

[pauljensen, 2016/01/19 16:03:39]

This is not allowed in style guide: "Don't put an alias in your public API just
to save typing in the implementation; do so only if you intend it to be used by
your clients."
https://google.github.io/styleguide/cppguide.html#Aliases

[mef, 2016/01/20 15:37:40]

Argh! I could argue that this class is NOT public API, but I won't. Done.

+
+namespace cronet {
+
+class CronetURLRequestContextAdapter;
+
+bool CronetBidirectionalStreamAdapterRegisterJni(JNIEnv* env);

[pauljensen, 2016/01/19 16:03:39]

nit: what about moving to a static member
CronetBidirectionalStreamAdapter::RegisterJni so it's clearer what this is
associated with

[mef, 2016/01/20 15:37:40]

Done.

+
+// An adapter from Java BidirectionalStream object to net::BidirectionalStream.
+// Created and configured from a Java thread. Start, ReadData, and Destroy are

[pauljensen, 2016/01/19 16:03:39]

This doesn't seem true.  ReadData() is called on some client thread,
ReadDataOnNetworkThread() is posted to network thread.

[mef, 2016/01/20 15:37:40]

Done.

+// posted to network thread and all callbacks into the Java BidirectionalStream
+// are done on the network thread. Java BidirectionalStream is expected to
+// initiate the next step like ReadData or Destroy. Public methods can be called
+// on any thread except Get* methods, which can only be called on the network

[pauljensen, 2016/01/19 16:03:40]

nit: I only see one Get* method; could just say "GetHeadersArray" instead of
"Get* methods"

[mef, 2016/01/20 15:37:40]

GetHeadersArray is now just a private helper method.

+// thread.
+class CronetBidirectionalStreamAdapter
+    : public net::BidirectionalStream::Delegate {
+ public:
+  CronetBidirectionalStreamAdapter(CronetURLRequestContextAdapter* context,
+                                   JNIEnv* env,
+                                   const JavaParamRef<jobject>& jbidi_stream);
+  ~CronetBidirectionalStreamAdapter() override;
+
+  // Validates method and headers, initializes and starts the request. If
+  // |jend_of_stream| is true, then stream is half-closed after sending header
+  // frame and no data is expected to be written.
+  // Returns 0 if request is valid and started successfully,
+  // Returns -1 if |jmethod| is not valid HTTP method name.
+  // Returns position of invalid header value in |jheaders| if header name is
+  // not valid.

[pauljensen, 2016/01/19 16:03:39]

isn't it position+1?

[mef, 2016/01/20 15:37:40]

position of header value == position of header name + 1.

+  jint Start(JNIEnv* env,
+             const JavaParamRef<jobject>& jcaller,
+             const JavaParamRef<jstring>& jurl,
+             jint jpriority,
+             const JavaParamRef<jstring>& jmethod,
+             const JavaParamRef<jobjectArray>& jheaders,
+             jboolean jend_of_stream);
+
+  // Reads more data.
+  jboolean ReadData(JNIEnv* env,
+                    const JavaParamRef<jobject>& jcaller,
+                    const JavaParamRef<jobject>& jbyte_buffer,
+                    jint jposition,
+                    jint jlimit);
+
+  // Writes more data.
+  jboolean WriteData(JNIEnv* env,
+                     const JavaParamRef<jobject>& jcaller,
+                     const JavaParamRef<jobject>& jbyte_buffer,
+                     jint jposition,
+                     jint jlimit,
+                     jboolean jend_of_stream);
+
+  // Releases all resources for the request and deletes the object itself.
+  // |jsend_on_canceled| indicates if Java onCanceled callback should be
+  // issued to indicate that no more callbacks will be issued.
+  void Destroy(JNIEnv* env,
+               const JavaParamRef<jobject>& jcaller,
+               jboolean jsend_on_canceled);
+
+  // net::BidirectionalStream::Delegate implementations:
+  void OnHeadersSent() override;
+  void OnHeadersReceived(const net::SpdyHeaderBlock& response_headers) override;
+  void OnDataRead(int bytes_read) override;
+  void OnDataSent() override;
+  void OnTrailersReceived(const net::SpdyHeaderBlock& trailers) override;
+  void OnFailed(int error) override;
+
+ private:
+  class IOBufferWithByteBuffer;
+
+  void StartOnNetworkThread(
+      scoped_ptr<net::BidirectionalStreamRequestInfo> request_info);
+  // Gets headers as Java array.
+  base::android::ScopedJavaLocalRef<jobjectArray> GetHeadersArray(
+      JNIEnv* env,
+      const net::SpdyHeaderBlock& header_block);
+  void ReadDataOnNetworkThread(
+      scoped_refptr<IOBufferWithByteBuffer> read_buffer,
+      int buffer_size);
+  void WriteDataOnNetworkThread(
+      scoped_refptr<IOBufferWithByteBuffer> read_buffer,
+      int buffer_size,
+      bool end_of_stream);
+  void DestroyOnNetworkThread(bool send_on_canceled);
+
+  CronetURLRequestContextAdapter* const context_;
+
+  // Java object that owns this CronetBidirectionalStreamAdapter.
+  base::android::ScopedJavaGlobalRef<jobject> owner_;
+
+  scoped_refptr<IOBufferWithByteBuffer> read_buffer_;
+  scoped_refptr<IOBufferWithByteBuffer> write_buffer_;
+  scoped_ptr<net::BidirectionalStream> bidi_stream_;
+
+  DISALLOW_COPY_AND_ASSIGN(CronetBidirectionalStreamAdapter);
+};
+
+}  // namespace cronet
+
+#endif  // COMPONENTS_CRONET_ANDROID_CRONET_BIDIRECTIONAL_STREAM_ADAPTER_H_