github.com/m3db/m3@v1.5.0/src/dbnode/storage/series/fake_block_reader_iter.go (about)

     1  // Copyright (c) 2021 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 series
    22  
    23  import (
    24  	"github.com/m3db/m3/src/dbnode/x/xio"
    25  	"github.com/m3db/m3/src/x/context"
    26  )
    27  
    28  // FakeBlockReaderIter iterates over the configured BlockReaders for testing.
    29  type FakeBlockReaderIter struct {
    30  	Readers [][]xio.BlockReader
    31  	cur     []xio.BlockReader
    32  	idx     int
    33  }
    34  
    35  // Next gets the next set of block readers.
    36  func (i *FakeBlockReaderIter) Next(_ context.Context) bool {
    37  	if i.idx >= len(i.Readers) {
    38  		return false
    39  	}
    40  	i.cur = i.Readers[i.idx]
    41  	i.idx++
    42  	return true
    43  }
    44  
    45  // Current gets the current set of block readers.
    46  func (i *FakeBlockReaderIter) Current() []xio.BlockReader {
    47  	return i.cur
    48  }
    49  
    50  // Err is non-nil if an error occurred when calling Next.
    51  func (i *FakeBlockReaderIter) Err() error {
    52  	return nil
    53  }
    54  
    55  // ToSlices returns the configured BlockReaders.
    56  func (i *FakeBlockReaderIter) ToSlices(_ context.Context) ([][]xio.BlockReader, error) {
    57  	return i.Readers, nil
    58  }