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options.go
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options.go
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// Copyright (c) 2016 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 retention
import (
"errors"
"time"
)
const (
// defaultRetentionPeriod is how long we keep data in memory by default.
defaultRetentionPeriod = 2 * 24 * time.Hour
// defaultBlockSize is the default block size
defaultBlockSize = 2 * time.Hour
// defaultBufferFuture is the default buffer future limit
defaultBufferFuture = 2 * time.Minute
// defaultBufferPast is the default buffer past limit
defaultBufferPast = 10 * time.Minute
// defaultDataExpiry is the default bool for whether data expiry is on
defaultDataExpiry = true
// defaultDataExpiryAfterNotAccessedPeriod is the default data expiry after not accessed period
defaultDataExpiryAfterNotAccessedPeriod = 5 * time.Minute
)
var (
errBufferFutureNonNegative = errors.New("buffer future must be non-negative")
errBufferPastNonNegative = errors.New("buffer past must be non-negative")
errBlockSizePositive = errors.New("block size must positive")
errBufferFutureTooLarge = errors.New("buffer future must be smaller than block size")
errBufferPastTooLarge = errors.New("buffer past must be smaller than block size")
errRetentionPeriodTooSmall = errors.New("retention period must not be smaller than block size")
)
type options struct {
retentionPeriod time.Duration
blockSize time.Duration
bufferFuture time.Duration
bufferPast time.Duration
dataExpiry bool
dataExpiryAfterNotAccessedPeriod time.Duration
}
// NewOptions creates new retention options
func NewOptions() Options {
return &options{
retentionPeriod: defaultRetentionPeriod,
blockSize: defaultBlockSize,
bufferFuture: defaultBufferFuture,
bufferPast: defaultBufferPast,
dataExpiry: defaultDataExpiry,
dataExpiryAfterNotAccessedPeriod: defaultDataExpiryAfterNotAccessedPeriod,
}
}
func (o *options) Validate() error {
if o.bufferFuture < 0 {
return errBufferFutureNonNegative
}
if o.bufferPast < 0 {
return errBufferPastNonNegative
}
if o.blockSize <= 0 {
return errBlockSizePositive
}
if o.bufferFuture >= o.blockSize {
return errBufferFutureTooLarge
}
if o.bufferPast >= o.blockSize {
return errBufferPastTooLarge
}
if o.retentionPeriod < o.blockSize {
return errRetentionPeriodTooSmall
}
return nil
}
func (o *options) Equal(value Options) bool {
return o.retentionPeriod == value.RetentionPeriod() &&
o.blockSize == value.BlockSize() &&
o.bufferFuture == value.BufferFuture() &&
o.bufferPast == value.BufferPast() &&
o.dataExpiry == value.BlockDataExpiry() &&
o.dataExpiryAfterNotAccessedPeriod == value.BlockDataExpiryAfterNotAccessedPeriod()
}
func (o *options) SetRetentionPeriod(value time.Duration) Options {
opts := *o
opts.retentionPeriod = value
return &opts
}
func (o *options) RetentionPeriod() time.Duration {
return o.retentionPeriod
}
func (o *options) SetBlockSize(value time.Duration) Options {
opts := *o
opts.blockSize = value
return &opts
}
func (o *options) BlockSize() time.Duration {
return o.blockSize
}
func (o *options) SetBufferFuture(value time.Duration) Options {
opts := *o
opts.bufferFuture = value
return &opts
}
func (o *options) BufferFuture() time.Duration {
return o.bufferFuture
}
func (o *options) SetBufferPast(value time.Duration) Options {
opts := *o
opts.bufferPast = value
return &opts
}
func (o *options) BufferPast() time.Duration {
return o.bufferPast
}
func (o *options) SetBlockDataExpiry(value bool) Options {
opts := *o
opts.dataExpiry = value
return &opts
}
func (o *options) BlockDataExpiry() bool {
return o.dataExpiry
}
func (o *options) SetBlockDataExpiryAfterNotAccessedPeriod(value time.Duration) Options {
opts := *o
opts.dataExpiryAfterNotAccessedPeriod = value
return &opts
}
func (o *options) BlockDataExpiryAfterNotAccessedPeriod() time.Duration {
return o.dataExpiryAfterNotAccessedPeriod
}