我正在使用咖啡因缓存。
我想将其置于尺寸限制下,但无法正常工作。
测试1:
Cache<String,String> cache = caffeine.newBuilder()
.maximumSize(3)
.build();
Cache<String,String> cache = caffeine.newBuilder()
.maximumSize(3)
.build();
for (int i = 1; i <= 10; i ++) {
String val = String.valueOf(i);
cache.put(val,val);
}
System.out.println("cache size: " + cache.estimatedSize() + ",cache keys: " + cache.asMap().values().stream().collect(Collectors.joining(",")));
result: cache size: 10,cache keys: 1,2,10
另一个测试:尝试获取密钥并将max设置为1
Cache<String,String> cache = caffeine.newBuilder()
.maximumSize(1)
.build();
for (int i = 1; i <= 10; i ++) {
String val = String.valueOf(i);
cache.put(val,val);
if (i % 2 == 0) {
cache.getIfPresent("5");
}
}
System.out.println("cache size: " + cache.estimatedSize() + ",")));
cache size: 10,cache keys: 2,3,4,5,6,7,8,9,10
最后一次测试:运行100次,最大大小为1
Cache<String,String> cache = caffeine.newBuilder()
.maximumSize(1)
.build();
for (int i = 1; i <= 100; i ++) {
String val = String.valueOf(i);
cache.put(val,")));
cache size: 99,cache keys: 96,97,99,19,23,58
有人可以帮助我理解这一点以及如何使其正常工作吗?
感谢Ben Manes,我添加了.executor(Runnable::run)
现在执行此操作后,我只会得到3项
Cache<String,String> cache = caffeine.newBuilder()
.maximumSize(3)
.executor(Runnable::run)
.build();
for (int i = 1; i <= 10; i ++) {
String val = String.valueOf(i);
cache.put(val,val);
if (i % 2 == 0) {
cache.getIfPresent("5");
}
}
cache.cleanUp();
System.out.println("cache size: " + cache.estimatedSize() + ",cache: " + CodecUtils.toJson(cache.asMap().values()));
cache size: 3,cache: ["3","9","10"]
- 这不会阻塞我的线程吗?
- 为什么多次使用时键5都不在缓存中?