46 lines
1.3 KiB
Go
46 lines
1.3 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rafthttp
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import (
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"io"
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)
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// snapshotStore is the store of snapshot. Caller could put one
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// snapshot into the store, and get it later.
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// snapshotStore stores at most one snapshot at a time, or it panics.
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type snapshotStore struct {
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rc io.ReadCloser
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// index of the stored snapshot
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// index is 0 if and only if there is no snapshot stored.
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index uint64
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}
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func (s *snapshotStore) put(rc io.ReadCloser, index uint64) {
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if s.index != 0 {
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plog.Panicf("unexpected put when there is one snapshot stored")
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}
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s.rc, s.index = rc, index
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}
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func (s *snapshotStore) get(index uint64) io.ReadCloser {
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if s.index == index {
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// set index to 0 to indicate no snapshot stored
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s.index = 0
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return s.rc
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}
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return nil
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}
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