1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
// Copyright 2015 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"reflect"
"sort"
"sync"
)
type Set interface {
Add(string)
Remove(string)
Contains(string) bool
Equals(Set) bool
Length() int
Values() []string
Copy() Set
Sub(Set) Set
}
func NewUnsafeSet(values ...string) *unsafeSet {
set := &unsafeSet{make(map[string]struct{})}
for _, v := range values {
set.Add(v)
}
return set
}
func NewThreadsafeSet(values ...string) *tsafeSet {
us := NewUnsafeSet(values...)
return &tsafeSet{us, sync.RWMutex{}}
}
type unsafeSet struct {
d map[string]struct{}
}
// Add adds a new value to the set (no-op if the value is already present)
func (us *unsafeSet) Add(value string) {
us.d[value] = struct{}{}
}
// Remove removes the given value from the set
func (us *unsafeSet) Remove(value string) {
delete(us.d, value)
}
// Contains returns whether the set contains the given value
func (us *unsafeSet) Contains(value string) (exists bool) {
_, exists = us.d[value]
return exists
}
// ContainsAll returns whether the set contains all given values
func (us *unsafeSet) ContainsAll(values []string) bool {
for _, s := range values {
if !us.Contains(s) {
return false
}
}
return true
}
// Equals returns whether the contents of two sets are identical
func (us *unsafeSet) Equals(other Set) bool {
v1 := sort.StringSlice(us.Values())
v2 := sort.StringSlice(other.Values())
v1.Sort()
v2.Sort()
return reflect.DeepEqual(v1, v2)
}
// Length returns the number of elements in the set
func (us *unsafeSet) Length() int {
return len(us.d)
}
// Values returns the values of the Set in an unspecified order.
func (us *unsafeSet) Values() (values []string) {
values = make([]string, 0)
for val := range us.d {
values = append(values, val)
}
return values
}
// Copy creates a new Set containing the values of the first
func (us *unsafeSet) Copy() Set {
cp := NewUnsafeSet()
for val := range us.d {
cp.Add(val)
}
return cp
}
// Sub removes all elements in other from the set
func (us *unsafeSet) Sub(other Set) Set {
oValues := other.Values()
result := us.Copy().(*unsafeSet)
for _, val := range oValues {
if _, ok := result.d[val]; !ok {
continue
}
delete(result.d, val)
}
return result
}
type tsafeSet struct {
us *unsafeSet
m sync.RWMutex
}
func (ts *tsafeSet) Add(value string) {
ts.m.Lock()
defer ts.m.Unlock()
ts.us.Add(value)
}
func (ts *tsafeSet) Remove(value string) {
ts.m.Lock()
defer ts.m.Unlock()
ts.us.Remove(value)
}
func (ts *tsafeSet) Contains(value string) (exists bool) {
ts.m.RLock()
defer ts.m.RUnlock()
return ts.us.Contains(value)
}
func (ts *tsafeSet) Equals(other Set) bool {
ts.m.RLock()
defer ts.m.RUnlock()
// If ts and other represent the same variable, avoid calling
// ts.us.Equals(other), to avoid double RLock bug
if _other, ok := other.(*tsafeSet); ok {
if _other == ts {
return true
}
}
return ts.us.Equals(other)
}
func (ts *tsafeSet) Length() int {
ts.m.RLock()
defer ts.m.RUnlock()
return ts.us.Length()
}
func (ts *tsafeSet) Values() (values []string) {
ts.m.RLock()
defer ts.m.RUnlock()
return ts.us.Values()
}
func (ts *tsafeSet) Copy() Set {
ts.m.RLock()
defer ts.m.RUnlock()
usResult := ts.us.Copy().(*unsafeSet)
return &tsafeSet{usResult, sync.RWMutex{}}
}
func (ts *tsafeSet) Sub(other Set) Set {
ts.m.RLock()
defer ts.m.RUnlock()
// If ts and other represent the same variable, avoid calling
// ts.us.Sub(other), to avoid double RLock bug
if _other, ok := other.(*tsafeSet); ok {
if _other == ts {
usResult := NewUnsafeSet()
return &tsafeSet{usResult, sync.RWMutex{}}
}
}
usResult := ts.us.Sub(other).(*unsafeSet)
return &tsafeSet{usResult, sync.RWMutex{}}
}
|
