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
|
// Copyright (C) 2012 The Android Open Source Project
//
// 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 com.google.gerrit.server.cache;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
import com.google.common.base.Strings;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.Weigher;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.extensions.annotations.PluginName;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.TypeLiteral;
import java.time.Duration;
class CacheProvider<K, V> implements Provider<Cache<K, V>>, CacheBinding<K, V>, CacheDef<K, V> {
private final CacheModule module;
final String name;
private final TypeLiteral<K> keyType;
private final TypeLiteral<V> valType;
private String configKey;
private long maximumWeight;
private Duration expireAfterWrite;
private Duration expireFromMemoryAfterAccess;
private Duration refreshAfterWrite;
private Provider<CacheLoader<K, V>> loader;
private Provider<Weigher<K, V>> weigher;
private String plugin;
private MemoryCacheFactory memoryCacheFactory;
private boolean frozen;
CacheProvider(CacheModule module, String name, TypeLiteral<K> keyType, TypeLiteral<V> valType) {
this.module = module;
this.name = name;
this.keyType = keyType;
this.valType = valType;
}
@Inject(optional = true)
void setPluginName(@PluginName String pluginName) {
this.plugin = pluginName;
}
@Inject
void setMemoryCacheFactory(MemoryCacheFactory factory) {
this.memoryCacheFactory = factory;
}
@Override
public CacheBinding<K, V> maximumWeight(long weight) {
checkNotFrozen();
maximumWeight = weight;
return this;
}
@Override
public CacheBinding<K, V> expireAfterWrite(Duration duration) {
checkNotFrozen();
expireAfterWrite = duration;
return this;
}
@Override
public CacheBinding<K, V> expireFromMemoryAfterAccess(Duration duration) {
checkNotFrozen();
expireFromMemoryAfterAccess = duration;
return this;
}
@Override
public CacheBinding<K, V> refreshAfterWrite(Duration duration) {
checkNotFrozen();
refreshAfterWrite = duration;
return this;
}
@Override
public CacheBinding<K, V> loader(Class<? extends CacheLoader<K, V>> impl) {
checkNotFrozen();
loader = module.bindCacheLoader(this, impl);
return this;
}
@Override
public CacheBinding<K, V> weigher(Class<? extends Weigher<K, V>> impl) {
checkNotFrozen();
weigher = module.bindWeigher(this, impl);
return this;
}
@Override
public CacheBinding<K, V> configKey(String name) {
checkNotFrozen();
configKey = requireNonNull(name);
return this;
}
@Override
public String name() {
if (!Strings.isNullOrEmpty(plugin)) {
return plugin + "." + name;
}
return name;
}
@Override
public String configKey() {
return configKey != null ? configKey : name();
}
@Override
public TypeLiteral<K> keyType() {
return keyType;
}
@Override
public TypeLiteral<V> valueType() {
return valType;
}
@Override
public long maximumWeight() {
return maximumWeight;
}
@Override
@Nullable
public Duration expireAfterWrite() {
return expireAfterWrite;
}
@Override
@Nullable
public Duration expireFromMemoryAfterAccess() {
return expireFromMemoryAfterAccess;
}
@Override
public Duration refreshAfterWrite() {
return refreshAfterWrite;
}
@Override
@Nullable
public Weigher<K, V> weigher() {
return weigher != null ? weigher.get() : null;
}
@Override
@Nullable
public CacheLoader<K, V> loader() {
return loader != null ? loader.get() : null;
}
@Override
public Cache<K, V> get() {
freeze();
CacheLoader<K, V> ldr = loader();
return ldr != null ? memoryCacheFactory.build(this, ldr) : memoryCacheFactory.build(this);
}
protected void checkNotFrozen() {
checkState(!frozen, "binding frozen, cannot be modified");
}
protected void freeze() {
frozen = true;
}
}
|