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spans.go
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/
spans.go
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// Copyright 2015 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License. See the AUTHORS file
// for names of contributors.
//
// Author: Marc Berhault (marc@cockroachlabs.com)
package keys
import (
"bytes"
"github.com/cockroachdb/cockroach/proto"
)
// Span describes a span of keys: [start,end).
// This will correspond to one or more range.
type Span struct {
Start, End proto.Key
}
// ContainsKey returns true if the span contains 'key'.
func (s *Span) ContainsKey(key proto.Key) bool {
addr := KeyAddress(key)
return bytes.Compare(addr, s.Start) >= 0 && bytes.Compare(addr, s.End) < 0
}
var (
// Meta1Span holds all first level addressing.
Meta1Span = Span{proto.KeyMin, Meta2Prefix}
// UserDataSpan is the non-meta and non-structured portion of the key space.
UserDataSpan = Span{SystemMax, TableDataPrefix}
// SystemDBSpan is the range of system objects for structured data.
SystemDBSpan = Span{TableDataPrefix, UserTableDataMin}
// NoSplitSpans describes the ranges that should never be split.
// Meta1Span: needed to find other ranges.
// SystemDBSpan: system objects have interdepencies.
NoSplitSpans = []Span{Meta1Span, SystemDBSpan}
)