41 lines
1.5 KiB
Go
41 lines
1.5 KiB
Go
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package paasio
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import "io"
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// ReadCounter is an interface describing objects that can be read from,
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// and that can count the number of times they have been read from.
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//
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// If multiple goroutines concurrently call Read, implementations are not
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// required to provide any guarantees about interleaving of the Read calls.
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// However, implementations MUST guarantee that calls to ReadCount always return
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// correct results even in the presence of concurrent Read calls.
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type ReadCounter interface {
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io.Reader
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// ReadCount returns the total number of bytes successfully read along
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// with the total number of calls to Read().
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ReadCount() (n int64, nops int)
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}
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// WriteCounter is an interface describing objects that can be written to,
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// and that can count the number of times they have been written to.
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//
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// If multiple goroutines concurrently call Write, implementations are not
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// required to provide any guarantees about interleaving of the Write calls.
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// However, implementations MUST guarantee that calls to WriteCount always return
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// correct results even in the presence of concurrent Write calls.
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type WriteCounter interface {
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io.Writer
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// WriteCount returns the total number of bytes successfully written along
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// with the total number of calls to Write().
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WriteCount() (n int64, nops int)
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}
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// ReadWriteCounter is the union of ReadCounter and WriteCounter.
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//
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// All guarantees that apply to either of ReadCounter or WriteCounter
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// also apply to ReadWriteCounter.
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type ReadWriteCounter interface {
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ReadCounter
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WriteCounter
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}
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