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tag.go
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tag.go
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// Copyright (c) 2017 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 id
import (
"bytes"
"github.com/m3db/m3/src/x/pool"
)
// TagPair contains a tag name and a tag value.
type TagPair struct {
Name []byte
Value []byte
}
// TagPairsByNameAsc sorts the tag pairs by tag names in ascending order.
type TagPairsByNameAsc []TagPair
func (tp TagPairsByNameAsc) Len() int { return len(tp) }
func (tp TagPairsByNameAsc) Swap(i, j int) { tp[i], tp[j] = tp[j], tp[i] }
func (tp TagPairsByNameAsc) Less(i, j int) bool {
return bytes.Compare(tp[i].Name, tp[j].Name) < 0
}
// SortedTagIteratorFn returns a sorted tag iterator over the provided id tag pairs.
type SortedTagIteratorFn func(tagPairs []byte) SortedTagIterator
// SortedTagIterator iterates over a set of tag pairs sorted by tag names.
type SortedTagIterator interface {
// Reset resets the iterator.
Reset(sortedTagPairs []byte)
// Next returns true if there are more tag names and values.
Next() bool
// Current returns the current tag name and value.
Current() ([]byte, []byte)
// Err returns any errors encountered.
Err() error
// Close closes the iterator.
Close()
}
// SortedTagIteratorAlloc allocates a new sorted tag iterator.
type SortedTagIteratorAlloc func() SortedTagIterator
// SortedTagIteratorPool is a pool of sorted tag iterators.
type SortedTagIteratorPool interface {
// Init initializes the iterator pool.
Init(alloc SortedTagIteratorAlloc)
// Get gets an iterator from the pool.
Get() SortedTagIterator
// Put returns an iterator to the pool.
Put(value SortedTagIterator)
}
type sortedTagIteratorPool struct {
pool pool.ObjectPool
}
// NewSortedTagIteratorPool creates a new pool for sorted tag iterators.
func NewSortedTagIteratorPool(opts pool.ObjectPoolOptions) SortedTagIteratorPool {
return &sortedTagIteratorPool{pool: pool.NewObjectPool(opts)}
}
func (p *sortedTagIteratorPool) Init(alloc SortedTagIteratorAlloc) {
p.pool.Init(func() interface{} {
return alloc()
})
}
func (p *sortedTagIteratorPool) Get() SortedTagIterator {
return p.pool.Get().(SortedTagIterator)
}
func (p *sortedTagIteratorPool) Put(it SortedTagIterator) {
p.pool.Put(it)
}