mirror of
https://github.com/featurebasedb/featurebase.git
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55 lines
1.5 KiB
Go
55 lines
1.5 KiB
Go
// Copyright 2017 Pilosa Corp.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package test
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import (
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"fmt"
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"github.com/pilosa/pilosa"
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)
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// NewCluster returns a cluster with n nodes and uses a mod-based hasher.
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func NewCluster(n int) *pilosa.Cluster {
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c := pilosa.NewCluster()
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c.ReplicaN = 1
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c.Hasher = NewModHasher()
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for i := 0; i < n; i++ {
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c.Nodes = append(c.Nodes, &pilosa.Node{
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Scheme: "http",
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Host: fmt.Sprintf("host%d", i),
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})
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}
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return c
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}
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// ModHasher represents a simple, mod-based hashing.
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type ModHasher struct{}
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// NewModHasher returns a new instance of ModHasher with n buckets.
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func NewModHasher() *ModHasher { return &ModHasher{} }
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func (*ModHasher) Hash(key uint64, n int) int { return int(key) % n }
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// ConstHasher represents hash that always returns the same index.
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type ConstHasher struct {
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i int
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}
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// NewConstHasher returns a new instance of ConstHasher that always returns i.
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func NewConstHasher(i int) *ConstHasher { return &ConstHasher{i: i} }
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func (h *ConstHasher) Hash(key uint64, n int) int { return h.i }
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