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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/executor/transform"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/parser"
"github.com/pkg/errors"
)
type sink interface {
transform.OpNode
closeWithError(err error)
getValue() (block.Block, error)
}
// resultNode collects final blocks.
type resultNode struct {
sync.RWMutex
wg sync.WaitGroup
err error
completed bool
block block.Block
}
func newResultNode() sink {
node := &resultNode{}
node.wg.Add(1)
return node
}
func (r *resultNode) closeWithLock() {
r.wg.Done()
r.completed = true
}
// Process sets the incoming block and releases the wait group.
func (r *resultNode) Process(_ *models.QueryContext,
_ parser.NodeID, block block.Block) error {
r.Lock()
defer r.Unlock()
if r.err != nil {
return r.err
}
if r.block != nil {
r.err = errors.New("resultNode block already set")
return r.err
}
r.block = block
r.closeWithLock()
return nil
}
func (r *resultNode) closeWithError(err error) {
r.Lock()
defer r.Unlock()
if r.completed {
return
}
r.err = err
r.closeWithLock()
}
func (r *resultNode) getValue() (block.Block, error) {
r.wg.Wait()
r.RLock()
bl, err := r.block, r.err
r.RUnlock()
return bl, err
}