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events.go
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events.go
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// Copyright 2019 eBay Inc.
// Primary authors: Simon Fell, Diego Ongaro,
// Raymond Kroeker, and Sathish Kandasamy.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package exec
import (
"time"
"github.com/ebay/akutan/query/planner/plandef"
"github.com/ebay/akutan/util/clocks"
)
// Events receives callbacks about the progress of the query execution.
// Methods in the interface can be called concurrently by the execution engine,
// implementations of this interface must be concurrent safe.
type Events interface {
// OpCompleted is called when an Operator has finished execution (even in
// error cases). The event parameter contains a summary of information about
// the execution.
OpCompleted(event OpCompletedEvent)
// Clocks will be called to obtain a time source that can be used for timing
// the execution.
Clock() clocks.Source
}
// OpCompletedEvent contains the collected data about a single execution of an
// operator. All these fields are populated by exec before it calls the
// OpCompleted method.
type OpCompletedEvent struct {
// The definition of the Operator that was executed. A single query execution
// may generate multiple OpCompleted events for the same Operator. For
// example because it's the right side input to a loop join.
Operator plandef.Operator
// The number of bulk input rows that were executed.
InputBulkCount uint32
// When the operator started execution.
StartedAt time.Time
// When the operator completed execution.
EndedAt time.Time
// resulting output Chunk/Row counts.
Output StreamStats
// if set, the execution failed with an error.
Err error
}
// StreamStats contains basic stats about a particular operator output stream
type StreamStats struct {
NumChunks int
NumFactSets int
FinalStatistics FinalStatistics
}
// ignoreEvents is an implementation of Events that ignores the callbacks.
type ignoreEvents struct {
}
func (ignoreEvents) OpCompleted(event OpCompletedEvent) {
}
func (ignoreEvents) Clock() clocks.Source {
return clocks.Wall
}