github.com/m3db/m3@v1.5.0/src/dbnode/persist/fs/noop_merge_with.go (about)

     1  // Copyright (c) 2020 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package fs
    22  
    23  import (
    24  	"github.com/m3db/m3/src/dbnode/namespace"
    25  	"github.com/m3db/m3/src/dbnode/x/xio"
    26  	"github.com/m3db/m3/src/x/context"
    27  	"github.com/m3db/m3/src/x/ident"
    28  	xtime "github.com/m3db/m3/src/x/time"
    29  )
    30  
    31  type noopMergeWith struct{}
    32  
    33  // NewNoopMergeWith creates a new noopMergeWith object. NoopMergeWith can be used
    34  // in conjunction with the merge.Merger to generate copies of filesets.
    35  func NewNoopMergeWith() MergeWith {
    36  	return &noopMergeWith{}
    37  }
    38  
    39  func (m *noopMergeWith) Read(
    40  	_ context.Context,
    41  	_ ident.ID,
    42  	_ xtime.UnixNano,
    43  	_ namespace.Context,
    44  ) ([]xio.BlockReader, bool, error) {
    45  	return nil, false, nil
    46  }
    47  
    48  func (m *noopMergeWith) ForEachRemaining(
    49  	_ context.Context,
    50  	_ xtime.UnixNano,
    51  	_ ForEachRemainingFn,
    52  	_ namespace.Context,
    53  ) error {
    54  	return nil
    55  }