Spaces:
Running
Running
File size: 1,425 Bytes
b110593 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 |
// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package cluster
import (
"fmt"
"math/rand"
)
type NodeIterationStrategy int
const (
StartRandom NodeIterationStrategy = iota
StartAfter
)
type NodeIterator struct {
hostnames []string
state int
}
type HostnameSource interface {
AllNames() []string
}
func NewNodeIterator(nodeNames []string,
strategy NodeIterationStrategy,
) (*NodeIterator, error) {
if strategy != StartRandom && strategy != StartAfter {
return nil, fmt.Errorf("unsupported strategy: %v", strategy)
}
startState := 0
if strategy == StartRandom {
startState = rand.Intn(len(nodeNames))
}
return &NodeIterator{
hostnames: nodeNames,
state: startState,
}, nil
}
func (n *NodeIterator) SetStartNode(startNode string) {
for i, node := range n.hostnames {
if node == startNode {
n.state = i + 1
if n.state == len(n.hostnames) {
n.state = 0
}
break
}
}
}
func (n *NodeIterator) Next() string {
curr := n.hostnames[n.state]
n.state++
if n.state == len(n.hostnames) {
n.state = 0
}
return curr
}
|