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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 | |
3 // found in the LICENSE file. | |
4 | |
5 // Package count contains 'counter' filters for all the gae services. This | |
6 // serves as a set of simple example filters, and also enables other filters | |
7 // to test to see if certain underlying APIs are called when they should be | |
8 // (e.g. for the datastore mcache filter, for example). | |
9 package count | |
10 | |
11 import ( | |
12 "sync/atomic" | |
13 ) | |
14 | |
15 // Entry is a success/fail pair for a single API method. It's returned | |
16 // by the Counter interface. | |
17 type Entry struct { | |
18 Successes int64 | |
19 Errors int64 | |
20 } | |
21 | |
22 // Total is a convenience function for getting the total number of calls to | |
23 // this API. It's Successes+Errors. | |
24 func (e Entry) Total() int64 { return e.Successes + e.Errors } | |
25 | |
26 func (e *Entry) up(errs ...error) error { | |
27 err := error(nil) | |
28 if len(errs) > 0 { | |
29 err = errs[0] | |
30 } | |
31 if err == nil { | |
32 atomic.AddInt64(&e.Successes, 1) | |
33 } else { | |
34 atomic.AddInt64(&e.Errors, 1) | |
35 } | |
36 return err | |
37 } | |
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