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1 // Copyright 2015 The LUCI Authors. All rights reserved. | 1 // Copyright 2015 The LUCI Authors. All rights reserved. |
2 // Use of this source code is governed under the Apache License, Version 2.0 | 2 // Use of this source code is governed under the Apache License, Version 2.0 |
3 // that can be found in the LICENSE file. | 3 // that can be found in the LICENSE file. |
4 | 4 |
5 package dscache | 5 package dscache |
6 | 6 |
7 import ( | 7 import ( |
8 ds "github.com/luci/gae/service/datastore" | 8 ds "github.com/luci/gae/service/datastore" |
9 "github.com/luci/gae/service/info" | 9 "github.com/luci/gae/service/info" |
10 mc "github.com/luci/gae/service/memcache" | 10 mc "github.com/luci/gae/service/memcache" |
11 » "github.com/luci/luci-go/common/mathrand" | 11 » "github.com/luci/luci-go/common/data/rand/mathrand" |
12 "golang.org/x/net/context" | 12 "golang.org/x/net/context" |
13 ) | 13 ) |
14 | 14 |
15 type key int | 15 type key int |
16 | 16 |
17 var dsTxnCacheKey key | 17 var dsTxnCacheKey key |
18 | 18 |
19 // FilterRDS installs a caching RawDatastore filter in the context. | 19 // FilterRDS installs a caching RawDatastore filter in the context. |
20 // | 20 // |
21 // It does nothing if IsGloballyEnabled returns false. That way it is possible | 21 // It does nothing if IsGloballyEnabled returns false. That way it is possible |
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57 shardsForKey, | 57 shardsForKey, |
58 } | 58 } |
59 | 59 |
60 v := c.Value(dsTxnCacheKey) | 60 v := c.Value(dsTxnCacheKey) |
61 if v == nil { | 61 if v == nil { |
62 return &dsCache{ds, sc} | 62 return &dsCache{ds, sc} |
63 } | 63 } |
64 return &dsTxnCache{ds, v.(*dsTxnState), sc} | 64 return &dsTxnCache{ds, v.(*dsTxnState), sc} |
65 }) | 65 }) |
66 } | 66 } |
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