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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_NETWORK_SINK_PATH_H_ |
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#define CVMFS_NETWORK_SINK_PATH_H_ |
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#include <cerrno> |
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#include <cstdio> |
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#include <string> |
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#include "sink.h" |
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#include "sink_file.h" |
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#include "util/pointer.h" |
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#include "util/posix.h" |
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namespace cvmfs { |
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/** |
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* PathSink is a data sink that writes to a file given by a path. |
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* |
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* Internally it uses a FileSink that has ownership of the file. |
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* (Though as PathSink is owner of the FileSink, to the outside also PathSink |
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* is considered to be the owner.) |
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* |
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* Like FileSink, PathSink does not require to reserve space. |
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* Contrary to FileSink, PathSink does not allow to adopt and write to a |
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* different file path. |
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*/ |
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class PathSink : public Sink { |
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public: |
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explicit PathSink(const std::string &destination_path); |
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virtual ~PathSink() { } // UniquePtr<FileSink> sink_ takes care of everything |
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/** |
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* Appends data to the sink |
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* |
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* @returns on success: number of bytes written (can be less than requested) |
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* on failure: -errno. |
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*/ |
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virtual int64_t Write(const void *buf, uint64_t sz) { |
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return sink_->Write(buf, sz); |
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} |
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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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* @returns Success = 0 |
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* Failure = -errno |
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*/ |
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virtual int Reset() { |
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return sink_->Reset(); |
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} |
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virtual int Purge(); |
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/** |
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* @returns true if the object is correctly initialized. |
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*/ |
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virtual bool IsValid() { |
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return sink_->IsValid(); |
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} |
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/** |
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* Commit data to the sink |
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* @returns success = 0 |
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* failure = -errno |
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*/ |
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virtual int Flush() { |
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return sink_->Flush(); |
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} |
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/** |
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* Reserves new space in sinks that require reservation (see RequiresReserve) |
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* |
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* Successful if the requested size is smaller than already space reserved, or |
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* if the sink is the owner of the data and can allocate enough new space. |
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* |
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* @note If successful, always resets the current position to 0. |
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* |
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* Fails if |
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* 1) sink is not the owner of the data and more than the current size is |
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* requested |
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* 2) more space is requested than allowed (max_size_) |
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* |
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* @returns success = true |
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* failure = false |
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*/ |
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virtual bool Reserve(size_t size) { |
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return sink_->Reserve(size); |
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} |
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/** |
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* Returns if the specific sink type needs reservation of (data) space |
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* |
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* @returns true - reservation is needed |
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* false - no reservation is needed |
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*/ |
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virtual bool RequiresReserve() { |
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return sink_->RequiresReserve(); |
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} |
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/** |
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* Return a string representation describing the type of sink and its status |
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*/ |
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virtual std::string Describe(); |
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const std::string path() { return path_; } |
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private: |
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FILE *file_; // owned by sink_ |
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UniquePtr<FileSink> sink_; |
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const std::string path_; |
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}; |
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} // namespace cvmfs |
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#endif // CVMFS_NETWORK_SINK_PATH_H_ |
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