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options.go
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options.go
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// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package migration
import (
"fmt"
"math"
"runtime"
)
// defaultMigrationConcurrency is the default number of concurrent workers to perform migrations.
var defaultMigrationConcurrency = int(math.Ceil(float64(runtime.NumCPU()) / 2))
type options struct {
targetMigrationVersion MigrationVersion
concurrency int
}
// NewOptions creates new migration options.
func NewOptions() Options {
return &options{
concurrency: defaultMigrationConcurrency,
}
}
func (o *options) Validate() error {
if err := ValidateMigrationVersion(o.targetMigrationVersion); err != nil {
return err
}
if o.concurrency < 1 {
return fmt.Errorf("concurrency value %d must be >= 1", o.concurrency)
}
return nil
}
func (o *options) SetTargetMigrationVersion(value MigrationVersion) Options {
opts := *o
opts.targetMigrationVersion = value
return &opts
}
func (o *options) TargetMigrationVersion() MigrationVersion {
return o.targetMigrationVersion
}
func (o *options) SetConcurrency(value int) Options {
opts := *o
opts.concurrency = value
return &opts
}
func (o *options) Concurrency() int {
return o.concurrency
}