noop_merge_with.go

// Copyright (c) 2020 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 fs

import (
	"github.com/m3db/m3/src/dbnode/namespace"
	"github.com/m3db/m3/src/dbnode/x/xio"
	"github.com/m3db/m3/src/x/context"
	"github.com/m3db/m3/src/x/ident"
	xtime "github.com/m3db/m3/src/x/time"
)

type noopMergeWith struct{}

// NewNoopMergeWith creates a new noopMergeWith object. NoopMergeWith can be used
// in conjunction with the merge.Merger to generate copies of filesets.
func NewNoopMergeWith() MergeWith {
	return &noopMergeWith{}
}

func (m *noopMergeWith) Read(
	_ context.Context,
	_ ident.ID,
	_ xtime.UnixNano,
	_ namespace.Context,
) ([]xio.BlockReader, bool, error) {
	return nil, false, nil
}

func (m *noopMergeWith) ForEachRemaining(
	_ context.Context,
	_ xtime.UnixNano,
	_ ForEachRemainingFn,
	_ namespace.Context,
) error {
	return nil
}