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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#ifndef CVMFS_SINK_H_ |
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#define CVMFS_SINK_H_ |
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#include <stdint.h> |
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namespace cvmfs { |
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/** |
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* A data sink that behaves like a writable file descriptor with a custom |
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* implementation. |
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* |
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* Currently used by the Fetcher class to redirect writing into a cache manager. |
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* |
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* TODO(jblomer): can all download destinations be implemented by inheriting |
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* from this class? |
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*/ |
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class Sink { |
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public: |
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virtual ~Sink() { } |
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/** |
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* Appends data to the sink, returns the number of bytes written or -errno. |
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*/ |
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virtual int64_t Write(const void *buf, uint64_t sz) = 0; |
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/** |
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* Truncate all written data and start over at position zero. |
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*/ |
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virtual int Reset() = 0; |
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}; |
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} // namespace cvmfs |
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#endif // CVMFS_SINK_H_ |
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