encoded_step_iterator.go

// 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 m3db

import (
	"github.com/m3db/m3/src/query/block"
	"github.com/m3db/m3/src/query/ts/m3db/consolidators"
)

type encodedStepIter struct {
	consolidator *consolidators.StepLookbackConsolidator
	encodedStepIterWithCollector
}

func (b *encodedBlock) StepIter() (
	block.StepIter,
	error,
) {
	cs := b.consolidation
	iters := b.seriesBlockIterators
	consolidator := consolidators.NewStepLookbackConsolidator(
		b.lookback,
		cs.bounds.StepSize,
		cs.currentTime,
		len(iters),
		cs.consolidationFn,
	)

	return &encodedStepIter{
		consolidator: consolidator,
		encodedStepIterWithCollector: encodedStepIterWithCollector{
			lastBlock: b.lastBlock,

			stepTime:   cs.currentTime,
			meta:       b.meta,
			seriesMeta: b.seriesMetas,

			collector:   consolidator,
			seriesPeek:  make([]peekValue, len(iters)),
			seriesIters: iters,
		},
	}, nil
}

func (it *encodedStepIter) Current() block.Step {
	return block.NewColStep(
		it.stepTime,
		it.consolidator.ConsolidateAndMoveToNext(),
	)
}