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72 lines
1.9 KiB
72 lines
1.9 KiB
/* |
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Copyright 2018 The Knative Authors |
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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 duck |
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import ( |
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"sync" |
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"k8s.io/apimachinery/pkg/runtime/schema" |
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"k8s.io/client-go/tools/cache" |
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) |
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// CachedInformerFactory implements InformerFactory by delegating to another |
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// InformerFactory, but memoizing the results. |
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type CachedInformerFactory struct { |
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Delegate InformerFactory |
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m sync.Mutex |
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cache map[schema.GroupVersionResource]*result |
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} |
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// Check that CachedInformerFactory implements InformerFactory. |
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var _ InformerFactory = (*CachedInformerFactory)(nil) |
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// Get implements InformerFactory. |
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func (cif *CachedInformerFactory) Get(gvr schema.GroupVersionResource) (cache.SharedIndexInformer, cache.GenericLister, error) { |
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cif.m.Lock() |
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if cif.cache == nil { |
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cif.cache = make(map[schema.GroupVersionResource]*result) |
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} |
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elt, ok := cif.cache[gvr] |
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if !ok { |
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elt = &result{} |
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elt.init = func() { |
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elt.inf, elt.lister, elt.err = cif.Delegate.Get(gvr) |
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} |
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cif.cache[gvr] = elt |
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} |
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// If this were done via "defer", then TestDifferentGVRs will fail. |
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cif.m.Unlock() |
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// The call to the delegate could be slow because it syncs informers, so do |
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// this outside of the main lock. |
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return elt.Get() |
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} |
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type result struct { |
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sync.Once |
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init func() |
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inf cache.SharedIndexInformer |
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lister cache.GenericLister |
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err error |
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} |
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func (t *result) Get() (cache.SharedIndexInformer, cache.GenericLister, error) { |
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t.Do(t.init) |
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return t.inf, t.lister, t.err |
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}
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