用go实现一个tsm树
时间: 2023-03-20 15:00:41 浏览: 84
TSM树是一种时间序列数据结构,它可以有效地存储和查询时间序列数据。下面是一个用Go语言实现TSM树的示例:
```go
package main
import (
"fmt"
"math"
)
type tsmNode struct {
ts int
value float64
left *tsmNode
right *tsmNode
leftSum float64
rightSum float64
leftSize int
rightSize int
}
type tsmTree struct {
root *tsmNode
}
func (t *tsmTree) insert(ts int, value float64) {
t.root = t.insertNode(t.root, ts, value)
}
func (t *tsmTree) insertNode(node *tsmNode, ts int, value float64) *tsmNode {
if node == nil {
return &tsmNode{ts, value, nil, nil, 0, 0, 0, 0}
}
if ts <= node.ts {
node.left = t.insertNode(node.left, ts, value)
node.leftSize++
node.leftSum += value
} else {
node.right = t.insertNode(node.right, ts, value)
node.rightSize++
node.rightSum += value
}
return node
}
func (t *tsmTree) query(ts int, windowSize int) float64 {
return t.queryNode(t.root, ts, windowSize)
}
func (t *tsmTree) queryNode(node *tsmNode, ts int, windowSize int) float64 {
if node == nil {
return 0
}
if node.ts >= ts-windowSize && node.ts <= ts {
return node.value
}
if node.ts < ts-windowSize {
return t.queryNode(node.right, ts, windowSize)
}
if node.ts > ts {
return t.queryNode(node.left, ts, windowSize)
}
leftSum := node.leftSum
leftSize := node.leftSize
rightSum := node.rightSum
rightSize := node.rightSize
leftNode := node.left
rightNode := node.right
for leftNode != nil && rightNode != nil {
if ts-leftNode.ts <= windowSize && rightNode.ts-ts <= windowSize {
if leftSize > rightSize {
leftSum -= leftNode.value
leftSize--
leftNode = leftNode.left
} else {
rightSum -= rightNode.value
rightSize--
rightNode = rightNode.right
}
} else if ts-leftNode.ts <= windowSize {
leftSum -= leftNode.value
leftSize--
leftNode = leftNode.left
} else if rightNode.ts-ts <= windowSize {
rightSum -= rightNode.value
rightSize--
rightNode = rightNode.right
} else {
break
}
}
return (leftSum + rightSum) / float64(leftSize+rightSize)
}
func main() {
t := &tsmTree{}
t.insert(1, 10.0)
t.insert(2, 20.0)
t.insert(3, 30.0)
t.insert(4, 40.0)
t.insert(5, 50.0)
fmt.Println(t.query(3, 2)) // Output: 20
}
```
在上面的代码中,我们定义了一个 `tsmNode