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block_reader.go
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/
block_reader.go
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// 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 xio
import (
"time"
"github.com/m3db/m3/src/dbnode/ts"
"github.com/m3db/m3/src/x/pool"
)
// CloneBlock returns a clone of the block with the underlying data reset
func (b BlockReader) CloneBlock(pool pool.CheckedBytesPool) (BlockReader, error) {
sr, err := b.SegmentReader.Clone(pool)
if err != nil {
return EmptyBlockReader, err
}
return BlockReader{
SegmentReader: sr,
Start: b.Start,
BlockSize: b.BlockSize,
}, nil
}
// IsEmpty returns true for the empty block
func (b BlockReader) IsEmpty() bool {
return b.SegmentReader == nil && b.Start.Equal(timeZero) && b.BlockSize == 0
}
// IsNotEmpty returns false for the empty block
func (b BlockReader) IsNotEmpty() bool {
return !b.IsEmpty()
}
// ResetWindowed resets the underlying reader window, as well as start time and blockSize for the block
func (b *BlockReader) ResetWindowed(segment ts.Segment, start time.Time, blockSize time.Duration) {
b.Reset(segment)
b.Start = start
b.BlockSize = blockSize
}