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98a6d0f79c
Mainly to add a somewhat functional file-impl wrapping a data_sink. This can implement a rudimentary, write-only, file based on any output sink. For testing, and because they fit there, place memory sink and source types there as well.
48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
/*
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* Copyright (C) 2017-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include <seastar/core/iostream.hh>
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#include <seastar/core/temporary_buffer.hh>
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#include <seastar/core/file.hh>
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#include <seastar/util/noncopyable_function.hh>
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#include "seastarx.hh"
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/**
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* Creates a write-only file wrapping a data_sink.
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*
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* The resulting file object can do sequential
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* writes only. It implements truncate, but is limited
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* to [<current write pos> - <write block size>] for
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* truncation position.
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*
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* Essentially, it is only really fit for
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* using as wrapped in a file_data_sink_impl under
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* an output_stream.
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*/
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seastar::file create_file_for_sink(seastar::data_sink);
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/**
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* Creates a file that can only do flush() and close().
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* Do not write to it.
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*/
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seastar::file create_noop_file();
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/**
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* Creates a data sink which will forward all data
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* sent to it into the destination vector.
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*/
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seastar::data_sink create_memory_sink(std::vector<seastar::temporary_buffer<char>>&);
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/**
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* Creates a data source that will read data sequentially
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* from the source vector buffers.
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*/
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seastar::data_source create_memory_source(std::vector<seastar::temporary_buffer<char>>);
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