54 lines
1.6 KiB
Go
54 lines
1.6 KiB
Go
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/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package storage
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import (
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"k8s.io/kubernetes/pkg/client/cache"
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)
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// Snapshotter is an interface capable of providing a consistent snapshot of
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// the underlying storage implementation of a pool. It does not guarantee
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// thread safety of snapshots, so they should be treated as read only unless
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// the implementation specifies otherwise.
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type Snapshotter interface {
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Snapshot() map[string]interface{}
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cache.ThreadSafeStore
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}
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// InMemoryPool is used as a cache for cluster resource pools.
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type InMemoryPool struct {
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cache.ThreadSafeStore
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}
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// Snapshot returns a read only copy of the k:v pairs in the store.
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// Caller beware: Violates traditional snapshot guarantees.
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func (p *InMemoryPool) Snapshot() map[string]interface{} {
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snap := map[string]interface{}{}
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for _, key := range p.ListKeys() {
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if item, ok := p.Get(key); ok {
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snap[key] = item
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}
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}
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return snap
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}
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// NewInMemoryPool creates an InMemoryPool.
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func NewInMemoryPool() *InMemoryPool {
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return &InMemoryPool{
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cache.NewThreadSafeStore(cache.Indexers{}, cache.Indices{})}
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}
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