mirror of
https://github.com/weaveworks/scope.git
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2c6b6e6707
Squash of: - use detailed.Summaries to render topology nodes - ban merging nodes of different topologies (they should be mapped) - need to prune parents when mapping node types - render container images by id if they have no name - remove separate render ids and prune parents in NewDerived* - don't render metrics/metadata for groups of nodes - fixing up tests - removing pending unit tests (for mapping.go, for now) - updating experimental dir for RenderableNode removal
44 lines
916 B
Go
44 lines
916 B
Go
package render
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import (
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"fmt"
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"math/rand"
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"github.com/bluele/gcache"
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"github.com/weaveworks/scope/report"
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)
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var renderCache = gcache.New(100).LRU().Build()
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type memoise struct {
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Renderer
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id string
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}
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// Memoise wraps the renderer in a loving embrace of caching
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func Memoise(r Renderer) Renderer {
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return &memoise{
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Renderer: r,
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id: fmt.Sprintf("%x", rand.Int63()),
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}
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}
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// Render produces a set of Nodes given a Report.
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// Ideally, it just retrieves it from the cache, otherwise it calls through to
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// `r` and stores the result.
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func (m *memoise) Render(rpt report.Report) report.Nodes {
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key := fmt.Sprintf("%s-%s", rpt.ID, m.id)
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if result, err := renderCache.Get(key); err == nil {
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return result.(report.Nodes)
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}
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output := m.Renderer.Render(rpt)
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renderCache.Set(key, output)
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return output
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}
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// ResetCache blows away the rendered node cache.
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func ResetCache() {
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renderCache.Purge()
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}
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