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result.go
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result.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 executor
import (
"sync"
"github.com/m3db/m3/src/query/block"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/parser"
"github.com/pkg/errors"
)
const (
// TODO: Get from config
channelSize = 100
)
var (
errAborted = errors.New("the query has been aborted")
)
// Result provides the execution results
type Result interface {
abort(err error)
done()
ResultChan() chan ResultChan
}
// ResultNode is used to provide the results to the caller from the query execution
type ResultNode struct {
mu sync.Mutex
resultChan chan ResultChan
aborted bool
}
// ResultChan has the result from a block
type ResultChan struct {
Block block.Block
Err error
}
func newResultNode() *ResultNode {
blocks := make(chan ResultChan, channelSize)
return &ResultNode{resultChan: blocks}
}
// Process the block
func (r *ResultNode) Process(queryCtx *models.QueryContext, ID parser.NodeID, block block.Block) error {
if r.aborted {
return errAborted
}
r.resultChan <- ResultChan{
Block: block,
}
return nil
}
// ResultChan return a channel to stream back resultChan to the client
func (r *ResultNode) ResultChan() chan ResultChan {
return r.resultChan
}
// TODO: Signal error downstream
func (r *ResultNode) abort(err error) {
r.mu.Lock()
defer r.mu.Unlock()
if r.aborted {
return
}
r.aborted = true
r.resultChan <- ResultChan{
Err: err,
}
close(r.resultChan)
}
func (r *ResultNode) done() {
close(r.resultChan)
}