wp

qb.go

@@ -24,28 +24,36 @@ const (
 )
 
 type TimestampCompressor interface {
-	// (timestamp) => compressionWay, requiredSpace
-	Evaluate(uint32) (int, int)
-	Compress(int, uint32)
-	Size() int
+	// (tmp, timestamp)
+	Evaluate([]byte, uint32) TimeEvaluationReport
+	// (offset, tmp)
+	Append(int, []byte)
+	//Size() int
 	//Chunks() [][]byte
 	//DeleteLast()
 	CaptureState()
 	ForgetCapturedState()
 	CreateDecompressor() TimestampDecompressor
 	//Payload() []byte // для снапшота
-	Offset() int
+	//	Offset() int
 	Rotate([]byte)
 	WritePayloadTo(io.Writer) error
 	LastTimestamp() uint32
 	ReplaceSinceWithUntil() uint32
 }
 
+type TimeEvaluationReport struct {
+	TotalSpace int
+	Offset     int
+	ChangeSize int
+}
+
 type ValueCompressor interface {
-	// (value) => compressionWay, requiredSpace
-	Evaluate(float64) (int, int)
-	Compress(int, float64)
-	Size() int
+	// (tmp, value)
+	Evaluate([]byte, float64) ValueEvaluationReport
+	// (offset, tmp, delta)
+	Append(int, []byte, uint64)
+	//Size() int
 	//Chunks() [][]byte
 	//DeleteLast()
 	CaptureState()
@@ -53,12 +61,19 @@ type ValueCompressor interface {
 	// fracDigits
 	CreateDecompressor() ValueDecompressor
 	//Payload() []byte // для снапшота
-	Offset() int
+	//Offset() int
 	Rotate([]byte)
 	WritePayloadTo(io.Writer) error
 	LastValue() float64
 }
 
+type ValueEvaluationReport struct {
+	TotalSpace int
+	Offset     int
+	ChangeSize int
+	Delta      uint64
+}
+
 type TimestampDecompressor interface {
 	NextValue() (uint32, bool)
 }