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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 #include "sync/engine/backoff_delay_provider.h" | 5 #include "components/sync/engine_impl/backoff_delay_provider.h" |
6 | 6 |
7 #include <stdint.h> | 7 #include <stdint.h> |
8 | 8 |
9 #include <algorithm> | 9 #include <algorithm> |
10 | 10 |
11 #include "base/rand_util.h" | 11 #include "base/rand_util.h" |
12 #include "sync/internal_api/public/engine/polling_constants.h" | 12 #include "components/sync/base/syncer_error.h" |
13 #include "sync/internal_api/public/sessions/model_neutral_state.h" | 13 #include "components/sync/engine/polling_constants.h" |
14 #include "sync/internal_api/public/util/syncer_error.h" | 14 #include "components/sync/sessions/model_neutral_state.h" |
15 | 15 |
16 using base::TimeDelta; | 16 using base::TimeDelta; |
17 | 17 |
18 namespace syncer { | 18 namespace syncer { |
19 | 19 |
20 // static | 20 // static |
21 BackoffDelayProvider* BackoffDelayProvider::FromDefaults() { | 21 BackoffDelayProvider* BackoffDelayProvider::FromDefaults() { |
22 return new BackoffDelayProvider( | 22 return new BackoffDelayProvider( |
23 TimeDelta::FromSeconds(kInitialBackoffRetrySeconds), | 23 TimeDelta::FromSeconds(kInitialBackoffRetrySeconds), |
24 TimeDelta::FromSeconds(kInitialBackoffImmediateRetrySeconds)); | 24 TimeDelta::FromSeconds(kInitialBackoffImmediateRetrySeconds)); |
25 } | 25 } |
26 | 26 |
27 // static | 27 // static |
28 BackoffDelayProvider* BackoffDelayProvider::WithShortInitialRetryOverride() { | 28 BackoffDelayProvider* BackoffDelayProvider::WithShortInitialRetryOverride() { |
29 return new BackoffDelayProvider( | 29 return new BackoffDelayProvider( |
30 TimeDelta::FromSeconds(kInitialBackoffShortRetrySeconds), | 30 TimeDelta::FromSeconds(kInitialBackoffShortRetrySeconds), |
31 TimeDelta::FromSeconds(kInitialBackoffImmediateRetrySeconds)); | 31 TimeDelta::FromSeconds(kInitialBackoffImmediateRetrySeconds)); |
32 } | 32 } |
33 | 33 |
34 BackoffDelayProvider::BackoffDelayProvider( | 34 BackoffDelayProvider::BackoffDelayProvider( |
35 const base::TimeDelta& default_initial_backoff, | 35 const base::TimeDelta& default_initial_backoff, |
36 const base::TimeDelta& short_initial_backoff) | 36 const base::TimeDelta& short_initial_backoff) |
37 : default_initial_backoff_(default_initial_backoff), | 37 : default_initial_backoff_(default_initial_backoff), |
38 short_initial_backoff_(short_initial_backoff) { | 38 short_initial_backoff_(short_initial_backoff) {} |
39 } | |
40 | 39 |
41 BackoffDelayProvider::~BackoffDelayProvider() {} | 40 BackoffDelayProvider::~BackoffDelayProvider() {} |
42 | 41 |
43 TimeDelta BackoffDelayProvider::GetDelay(const base::TimeDelta& last_delay) { | 42 TimeDelta BackoffDelayProvider::GetDelay(const base::TimeDelta& last_delay) { |
44 if (last_delay.InSeconds() >= kMaxBackoffSeconds) | 43 if (last_delay.InSeconds() >= kMaxBackoffSeconds) |
45 return TimeDelta::FromSeconds(kMaxBackoffSeconds); | 44 return TimeDelta::FromSeconds(kMaxBackoffSeconds); |
46 | 45 |
47 // This calculates approx. base_delay_seconds * 2 +/- base_delay_seconds / 2 | 46 // This calculates approx. base_delay_seconds * 2 +/- base_delay_seconds / 2 |
48 int64_t backoff_s = | 47 int64_t backoff_s = |
49 std::max(static_cast<int64_t>(1), | 48 std::max(static_cast<int64_t>(1), |
50 last_delay.InSeconds() * kBackoffRandomizationFactor); | 49 last_delay.InSeconds() * kBackoffRandomizationFactor); |
51 | 50 |
52 // Flip a coin to randomize backoff interval by +/- 50%. | 51 // Flip a coin to randomize backoff interval by +/- 50%. |
53 int rand_sign = base::RandInt(0, 1) * 2 - 1; | 52 int rand_sign = base::RandInt(0, 1) * 2 - 1; |
54 | 53 |
55 // Truncation is adequate for rounding here. | 54 // Truncation is adequate for rounding here. |
56 backoff_s = backoff_s + | 55 backoff_s = |
| 56 backoff_s + |
57 (rand_sign * (last_delay.InSeconds() / kBackoffRandomizationFactor)); | 57 (rand_sign * (last_delay.InSeconds() / kBackoffRandomizationFactor)); |
58 | 58 |
59 // Cap the backoff interval. | 59 // Cap the backoff interval. |
60 backoff_s = std::max(static_cast<int64_t>(1), | 60 backoff_s = std::max(static_cast<int64_t>(1), |
61 std::min(backoff_s, kMaxBackoffSeconds)); | 61 std::min(backoff_s, kMaxBackoffSeconds)); |
62 | 62 |
63 return TimeDelta::FromSeconds(backoff_s); | 63 return TimeDelta::FromSeconds(backoff_s); |
64 } | 64 } |
65 | 65 |
66 TimeDelta BackoffDelayProvider::GetInitialDelay( | 66 TimeDelta BackoffDelayProvider::GetInitialDelay( |
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100 // TODO(sync): We shouldn't need to handle this in BackoffDelayProvider. | 100 // TODO(sync): We shouldn't need to handle this in BackoffDelayProvider. |
101 // There should be a way to deal with protocol errors before we get to this | 101 // There should be a way to deal with protocol errors before we get to this |
102 // point. | 102 // point. |
103 if (state.commit_result == SERVER_RETURN_CONFLICT) | 103 if (state.commit_result == SERVER_RETURN_CONFLICT) |
104 return short_initial_backoff_; | 104 return short_initial_backoff_; |
105 | 105 |
106 return default_initial_backoff_; | 106 return default_initial_backoff_; |
107 } | 107 } |
108 | 108 |
109 } // namespace syncer | 109 } // namespace syncer |
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