The important part of the Circumflex Cache framework technology in the Java class library
Important part of the Circumflex Cache framework technology in the Java class library
Circumflex Cache is an efficient cache framework used in the Java class library.It provides developers with a simple and powerful method to achieve the cache of the object to improve the performance and response time of the application.The key components of the Circumflex Cache framework technology include the following aspects:
1. Cache Interface:
The cache interface in the Circumflex Cache framework is a Java interface that defines the cache operation method.It contains the basic operation of the storage object in the cache, such as obtaining objects, adding objects, deleting objects, etc.Developers can define their specific cache implementation by implementing this interface.
public interface Cache<K, V> {
V get(K key);
void put(K key, V value);
void remove(K key);
void clear();
boolean contains(K key);
}
2. Cache Manager:
The cache manager is one of the core components of the Circumflex Cache framework technology.It is responsible for creating, configuration, and managing the life cycle of multiple cache objects.Developers can obtain one or more cache instances through cache managers, and specify their size, expiration strategy, replacement strategy and other attributes.
public class CacheManager {
private Map<String, Cache<?, ?>> caches;
public <K, V> Cache<K, V> createCache(String name, int maxSize, ExpirationPolicy<K, V> expirationPolicy, ReplacementPolicy<K, V> replacementPolicy) {
Cache<K, V> cache = new DefaultCache<>(maxSize, expirationPolicy, replacementPolicy);
caches.put(name, cache);
return cache;
}
public <K, V> Cache<K, V> getCache(String name) {
return (Cache<K, V>) caches.get(name);
}
public void removeCache(String name) {
caches.remove(name);
}
}
3. Expiration Policy:
The expiration strategy determines when the object in the cache expires and removes from the cache.The Circumflex Cache framework provides a variety of built -in expiration strategies, such as time -based and number of access.Developers can also achieve customized expiration strategies according to their own needs.
public interface ExpirationPolicy<K, V> {
boolean isExpired(K key, CacheEntry<V> entry);
}
public class TimeBasedExpirationPolicy<K, V> implements ExpirationPolicy<K, V> {
private long expirationMillis;
public TimeBasedExpirationPolicy(long expirationMillis) {
this.expirationMillis = expirationMillis;
}
@Override
public boolean isExpired(K key, CacheEntry<V> entry) {
long currentTimeMillis = System.currentTimeMillis();
return (currentTimeMillis - entry.getCreationTime()) > expirationMillis;
}
}
4. Replacement Policy:
The replacement strategy determines which objects will be removed when the cache space is insufficient.Similar to expired strategies, the Circumflex Cache framework also provides a variety of built -in replacement strategies, such as the recent minimum use (LRU), minimum use frequency (LFU), and so on.Developers can also implement custom replacement strategies.
public interface ReplacementPolicy<K, V> {
void access(K key, CacheEntry<V> entry);
K findReplacementKey();
}
public class LRUReplacementPolicy<K, V> implements ReplacementPolicy<K, V> {
private LinkedHashMap<K, CacheEntry<V>> accessOrderMap;
public LRUReplacementPolicy() {
accessOrderMap = new LinkedHashMap<>(16, 0.75f, true);
}
@Override
public void access(K key, CacheEntry<V> entry) {
accessOrderMap.put(key, entry);
}
@Override
public K findReplacementKey() {
return accessOrderMap.entrySet().iterator().next().getKey();
}
}
By using the Circumflex Cache framework technology, developers can easily achieve efficient object cache in the Java library.This framework provides flexible cache management and configuration options, and supports customized and replacement strategies.By using the cache reasonably, developers can significantly improve the performance and response time of the application.
