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// 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_UPLOAD_DATA_STREAM_DELEGATE_H_
#define COMPONENTS_CRONET_ANDROID_CRONET_UPLOAD_DATA_STREAM_DELEGATE_H_
#include <jni.h>
#include "base/android/scoped_java_ref.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "components/cronet/android/cronet_upload_data_stream.h"
#include "net/base/io_buffer.h"
namespace base {
class SingleThreadTaskRunner;
} // namespace base
namespace cronet {
// The Delegate holds onto a reference to the IOBuffer that is currently being
// written to in Java, so may not be deleted until any read operation in Java
// has completed.
//
// The Delegate is owned by the Java CronetUploadDataStream, and also owns a
// reference to it. The Delegate is only destroyed after the net::URLRequest
// destroys the C++ CronetUploadDataStream and the Java CronetUploadDataStream
// has no read operation pending, at which point it also releases its reference
// to the Java CronetUploadDataStream.
//
// Failures don't go through the delegate, but directly to the Java request
// object, since normally reads aren't allowed to fail during an upload.
class CronetUploadDataStreamDelegate : public CronetUploadDataStream::Delegate {
public:
CronetUploadDataStreamDelegate(JNIEnv* env, jobject jupload_data_stream);
~CronetUploadDataStreamDelegate() override;
// CronetUploadDataStream::Delegate implementation. Called on network thread.
void InitializeOnNetworkThread(
base::WeakPtr<CronetUploadDataStream> upload_data_stream) override;
void Read(net::IOBuffer* buffer, int buf_len) override;
void Rewind() override;
void OnUploadDataStreamDestroyed() override;
// Callbacks from Java, called on some Java thread.
void OnReadSucceeded(JNIEnv* env,
jobject obj,
int bytes_read,
bool final_chunk);
void OnRewindSucceeded(JNIEnv* env, jobject obj);
private:
// Initialized on construction, effectively constant.
base::android::ScopedJavaGlobalRef<jobject> jupload_data_stream_;
// These are initialized in InitializeOnNetworkThread, so are safe to access
// during Java callbacks, which all happen after initialization.
scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
base::WeakPtr<CronetUploadDataStream> upload_data_stream_;
// Used to keep the read buffer alive until the callback from Java has been
// received.
scoped_refptr<net::IOBuffer> buffer_;
DISALLOW_COPY_AND_ASSIGN(CronetUploadDataStreamDelegate);
};
// Explicitly register static JNI functions.
bool CronetUploadDataStreamDelegateRegisterJni(JNIEnv* env);
} // namespace cronet
#endif // COMPONENTS_CRONET_ANDROID_CRONET_UPLOAD_DATA_STREAM_DELEGATE_H_
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