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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 package taskqueue | 5 package taskqueue |
6 | 6 |
7 import ( | 7 import ( |
8 "golang.org/x/net/context" | 8 "golang.org/x/net/context" |
9 ) | 9 ) |
10 | 10 |
11 type key int | 11 type key int |
12 | 12 |
13 var ( | 13 var ( |
14 taskQueueKey key | 14 taskQueueKey key |
15 taskQueueFilterKey key = 1 | 15 taskQueueFilterKey key = 1 |
16 ) | 16 ) |
17 | 17 |
18 // Factory is the function signature for factory methods compatible with | 18 // Factory is the function signature for factory methods compatible with |
19 // SetFactory. | 19 // SetFactory. |
20 type Factory func(context.Context) Interface | 20 type Factory func(context.Context) Interface |
21 | 21 |
22 // Filter is the function signature for a filter TQ implementation. It | 22 // Filter is the function signature for a filter TQ implementation. It |
23 // gets the current TQ implementation, and returns a new TQ implementation | 23 // gets the current TQ implementation, and returns a new TQ implementation |
24 // backed by the one passed in. | 24 // backed by the one passed in. |
25 type Filter func(context.Context, Interface) Interface | 25 type Filter func(context.Context, Interface) Interface |
26 | 26 |
27 // GetUnfiltered gets gets the Interface implementation from context without | 27 // getUnfiltered gets gets the Interface implementation from context without |
28 // any of the filters applied. | 28 // any of the filters applied. |
29 func GetUnfiltered(c context.Context) Interface { | 29 func getUnfiltered(c context.Context) Interface { |
30 if f, ok := c.Value(taskQueueKey).(Factory); ok && f != nil { | 30 if f, ok := c.Value(taskQueueKey).(Factory); ok && f != nil { |
31 return f(c) | 31 return f(c) |
32 } | 32 } |
33 return nil | 33 return nil |
34 } | 34 } |
35 | 35 |
36 // Get gets the Interface implementation from context. | 36 // Get gets the Interface implementation from context. |
37 func Get(c context.Context) Interface { | 37 func Get(c context.Context) Interface { |
38 » ret := GetUnfiltered(c) | 38 » ret := getUnfiltered(c) |
39 if ret == nil { | 39 if ret == nil { |
40 return nil | 40 return nil |
41 } | 41 } |
42 for _, f := range getCurFilters(c) { | 42 for _, f := range getCurFilters(c) { |
43 ret = f(c, ret) | 43 ret = f(c, ret) |
44 } | 44 } |
45 return ret | 45 return ret |
46 } | 46 } |
47 | 47 |
48 // SetFactory sets the function to produce Interface instances, as returned by | 48 // SetFactory sets the function to produce Interface instances, as returned by |
(...skipping 21 matching lines...) Expand all Loading... |
70 func AddFilters(c context.Context, filts ...Filter) context.Context { | 70 func AddFilters(c context.Context, filts ...Filter) context.Context { |
71 if len(filts) == 0 { | 71 if len(filts) == 0 { |
72 return c | 72 return c |
73 } | 73 } |
74 cur := getCurFilters(c) | 74 cur := getCurFilters(c) |
75 newFilts := make([]Filter, 0, len(cur)+len(filts)) | 75 newFilts := make([]Filter, 0, len(cur)+len(filts)) |
76 newFilts = append(newFilts, getCurFilters(c)...) | 76 newFilts = append(newFilts, getCurFilters(c)...) |
77 newFilts = append(newFilts, filts...) | 77 newFilts = append(newFilts, filts...) |
78 return context.WithValue(c, taskQueueFilterKey, newFilts) | 78 return context.WithValue(c, taskQueueFilterKey, newFilts) |
79 } | 79 } |
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