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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_ADAPTER_H_
#define COMPONENTS_CRONET_ANDROID_CRONET_UPLOAD_DATA_STREAM_ADAPTER_H_
#include "base/basictypes.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "net/base/upload_data_stream.h"
namespace net {
class IOBuffer;
} // namespace net
namespace cronet {
// The CronetUploadDataStreamAdapter is created on a Java thread, but
// afterwards, lives and is deleted on the network thread. It's responsible for
// invoking UploadDataStream's callbacks, and ensuring only one read/rewind
// request sent to Java is outstanding at a time. The main complexity is around
// Reset/Initialize calls while there's a pending read or rewind.
class CronetUploadDataStreamAdapter : public net::UploadDataStream {
public:
class Delegate {
public:
// Called once during initial setup on the network thread, called before
// all other methods.
virtual void InitializeOnNetworkThread(
base::WeakPtr<CronetUploadDataStreamAdapter> adapter) = 0;
// Called for each read request. Delegate must respond by calling
// OnReadSuccess on the network thread asynchronous, or failing the request.
// Only called when there's no other pending read or rewind operation.
virtual void Read(net::IOBuffer* buffer, int buf_len) = 0;
// Called to rewind the stream. Not called when already at the start of the
// stream. The delegate must respond by calling OnRewindSuccess
// asynchronously on the network thread, or failing the request. Only called
// when there's no other pending read or rewind operation.
virtual void Rewind() = 0;
// Called when the adapter is destroyed. May be called when there's a
// pending read or rewind operation. The Delegate is then responsible for
// destroying itself.
virtual void OnAdapterDestroyed() = 0;
protected:
Delegate() {}
virtual ~Delegate() {}
private:
DISALLOW_COPY_AND_ASSIGN(Delegate);
};
CronetUploadDataStreamAdapter(Delegate* delegate, int64 size);
~CronetUploadDataStreamAdapter() override;
// Failure is handled at the Java layer. These two success callbacks are
// invoked by Java UploadDataSink upon completion of the operation.
void OnReadSuccess(int bytes_read, bool final_chunk);
void OnRewindSuccess();
private:
// net::UploadDataStream implementation:
int InitInternal() override;
int ReadInternal(net::IOBuffer* buf, int buf_len) override;
void ResetInternal() override;
// Starts rewinding the stream. Only called when not already at the front of
// the stream, and no operation is pending. Completes asynchronously.
void StartRewind();
// Size of the upload. -1 if chunked.
const int64 size_;
// True if ReadInternal has been called, the read hasn't completed, and there
// hasn't been a ResetInternal call yet.
bool waiting_on_read_;
// True if there's a read operation in progress. This will always be true
// when |waiting_on_read_| is true. This will only be set to false once it
// completes, even though ResetInternal may have been called since the read
// started.
bool read_in_progress_;
// True if InitInternal has been called, the rewind hasn't completed, and
// there hasn't been a ResetInternal call yet. Note that this may be true
// even when the rewind hasn't yet started, if there's a read in progress.
bool waiting_on_rewind_;
// True if there's a rewind operation in progress. Rewinding will only start
// when |waiting_on_rewind_| is true, and |read_in_progress_| is false. This
// will only be set to false once it completes, even though ResetInternal may
// have been called since the rewind started.
bool rewind_in_progress_;
// Set to false when a read starts, true when a rewind completes.
bool at_front_of_stream_;
Delegate* const delegate_;
// Vends pointers on the network thread, though created on a Java thread.
base::WeakPtrFactory<CronetUploadDataStreamAdapter> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(CronetUploadDataStreamAdapter);
};
} // namespace cronet
#endif // COMPONENTS_CRONET_ANDROID_CRONET_UPLOAD_DATA_STREAM_ADAPTER_H_
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