英文:
Example of Caffeine per key expiryusage
问题
以下是翻译的内容：
在Caffeine中如何使用每个键的到期设置是否有示例？
我看到了以下示例 - 这是否意味着我们要为每个键创建一个Caffeine缓存实例？
Caffeine.newBuilder()
.expireAfter(new Expiry<Key, Graph>() {
public long expireAfterCreate(Key key, Graph graph, long currentTime) {
return (graph instanceof NullGraph)
? TimeUnit.MINUTES.toNanos(1)
: TimeUnit.MINUTES.toNanos(10);
}
public long expireAfterUpdate(Key key, Graph graph,
long currentTime, long currentDuration) {
return currentDuration;
}
public long expireAfterRead(Key key, Graph graph,
long currentTime, long currentDuration) {
return currentDuration;
}
})
.build(key -> createExpensiveGraph(key));
我查看了实现并了解了到期接口的内部使用方式。
所以，假设我的图对象有一个到期时长的方法...这是否是正确的用法？
final Cache<Key, Graph> cache = Caffeine.newBuilder()
.expireAfter(new Expiry<Key, Graph>() {
public long expireAfterCreate(Key key, Graph graph, long currentTime) {
return currentTime + graph.expireAfterNanos();
}
public long expireAfterUpdate(Key key, Graph graph,
long currentTime, long currentDuration) {
return Long.MAX_VALUE;
}
public long expireAfterRead(Key key, Graph graph,
long currentTime, long currentDuration) {
return Long.MAX_VALUE;
}
})
.build();
现在，每当我执行以下操作时 - 每个键插入都将启用键到期：
cache.put(key, graph); // 这里未显示键和图的创建。
英文:
Are there any examples of how to use per key expiry in Caffeine?
I see the following example -- does it mean we are create a Caffeine cache instance per key?
https://github.com/ben-manes/caffeine/issues/114#issuecomment-300602200
Caffeine.newBuilder()
.expireAfter(new Expiry<Key, Graph>() {
public long expireAfterCreate(Key key, Graph graph, long currentTime) {
return (graph instanceof NullGraph)
? TimeUnit.MINUTES.toNanos(1)
: TimeUnit.MINUTES.toNanos(10);
}
public long expireAfterUpdate(Key key, Graph graph,
long currentTime, long currentDuration) {
return currentDuration;
}
public long expireAfterRead(Key key, Graph graph,
long currentTime, long currentDuration) {
return currentDuration;
}
})
.build(key -> createExpensiveGraph(key));
I looked at the implementation and see how the implementation of the expiry interface is used internally.
So say my graph object had a method for expiry duration .. would this be a correct usage?
final Cache<Key, Graph> cache = Caffeine.newBuilder()
.expireAfter(new Expiry<Key, Graph>() {
public long expireAfterCreate(Key key, Graph graph, long currentTime) {
return currentTime + graph.expireAfterNanos();
}
public long expireAfterUpdate(Key key, Graph graph,
long currentTime, long currentDuration) {
return Long.Max;
}
public long expireAfterRead(Key key, Graph graph,
long currentTime, long currentDuration) {
return Long.Max;
}
})
.build();
Now any time I do something like the following -- per key expiry will be enabled for the key inserted -
cache.put(key, graph); // key and graph creation not shown here.
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