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// Copyright 2015 The Weave 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 LIBWEAVE_INCLUDE_WEAVE_STREAM_H_
#define LIBWEAVE_INCLUDE_WEAVE_STREAM_H_
#include <string>
#include <base/callback.h>
#include <weave/error.h>
namespace weave {
// Interface for async input streaming.
class InputStream {
public:
virtual ~InputStream() {}
// Callback type for Read.
using ReadCallback = base::Callback<void(size_t size, ErrorPtr error)>;
// Implementation should return immediately and post callback after
// completing operation. Caller guarantees that buffet is alive until callback
// is called.
virtual void Read(void* buffer,
size_t size_to_read,
const ReadCallback& callback) = 0;
};
// Interface for async input streaming.
class OutputStream {
public:
virtual ~OutputStream() {}
using WriteCallback = base::Callback<void(ErrorPtr error)>;
// Implementation should return immediately and post callback after
// completing operation. Caller guarantees that buffet is alive until either
// of callback is called.
// Success callback must be called only after all data is written.
virtual void Write(const void* buffer,
size_t size_to_write,
const WriteCallback& callback) = 0;
};
// Interface for async bi-directional streaming.
class Stream : public InputStream, public OutputStream {
public:
~Stream() override {}
// Cancels all pending read or write requests. Canceled operations must not
// call any callbacks.
virtual void CancelPendingOperations() = 0;
};
} // namespace weave
#endif // LIBWEAVE_INCLUDE_WEAVE_STREAM_H_