forked from m3db/m3
/
fetch_tagged_results_index_iterator.go
112 lines (97 loc) · 3.08 KB
/
fetch_tagged_results_index_iterator.go
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// Copyright (c) 2018 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 client
import (
"github.com/m3db/m3/src/x/serialize"
"github.com/m3db/m3/src/x/ident"
)
// FOLLOWUP(prateek): add pooling for taggedIDsIterator(s).
type taggedIDsIterator struct {
currentIdx int
err error
pools fetchTaggedPools
current struct {
nsID ident.ID
tsID ident.ID
tags serialize.TagDecoder
}
backing struct {
nses [][]byte
ids [][]byte
tags [][]byte
}
}
// make the compiler ensure the concrete type `&taggedIDsIterator{}` implements
// the `TaggedIDsIterator` interface.
var _ TaggedIDsIterator = &taggedIDsIterator{}
func newTaggedIDsIterator(pools fetchTaggedPools) *taggedIDsIterator {
return &taggedIDsIterator{
currentIdx: -1,
pools: pools,
}
}
func (i *taggedIDsIterator) Next() bool {
if i.err != nil || i.currentIdx >= len(i.backing.ids) {
return false
}
i.release()
i.currentIdx++
if i.currentIdx >= len(i.backing.ids) {
return false
}
dec := i.pools.TagDecoder().Get()
wb := i.pools.CheckedBytesWrapper().Get(i.backing.tags[i.currentIdx])
dec.Reset(wb)
i.current.tsID = ident.BytesID(i.backing.ids[i.currentIdx])
i.current.nsID = ident.BytesID(i.backing.nses[i.currentIdx])
i.current.tags = dec
return true
}
func (i *taggedIDsIterator) addBacking(nsID, tsID, tags []byte) {
i.backing.nses = append(i.backing.nses, nsID)
i.backing.ids = append(i.backing.ids, tsID)
i.backing.tags = append(i.backing.tags, tags)
}
func (i *taggedIDsIterator) Finalize() {
i.release()
i.backing.nses = nil
i.backing.ids = nil
i.backing.tags = nil
}
func (i *taggedIDsIterator) release() {
if id := i.current.nsID; id != nil {
id.Finalize()
i.current.nsID = nil
}
if id := i.current.tsID; id != nil {
id.Finalize()
i.current.tsID = nil
}
if decoder := i.current.tags; decoder != nil {
decoder.Close()
i.current.tags = nil
}
}
func (i *taggedIDsIterator) Current() (ident.ID, ident.ID, ident.TagIterator) {
return i.current.nsID, i.current.tsID, i.current.tags
}
func (i *taggedIDsIterator) Err() error {
return i.err
}