~~~ package org.apache.ibatis.cache.decorators; import org.apache.ibatis.cache.Cache; import org.apache.ibatis.logging.Log; import org.apache.ibatis.logging.LogFactory; /** * @author Clinton Begin */ public class LoggingCache implements Cache { private final Log log; private final Cache delegate; protected int requests = 0; protected int hits = 0; public LoggingCache(Cache delegate) { this.delegate = delegate; this.log = LogFactory.getLog(getId()); } @Override public String getId() { return delegate.getId(); } @Override public int getSize() { return delegate.getSize(); } @Override public void putObject(Object key, Object object) { delegate.putObject(key, object); } @Override public Object getObject(Object key) { //請求數計算 requests++; final Object value = delegate.getObject(key); if (value != null) { //點擊數計算 hits++; } if (log.isDebugEnabled()) { log.debug("Cache Hit Ratio [" + getId() + "]: " + getHitRatio()); } return value; } @Override public Object removeObject(Object key) { return delegate.removeObject(key); } @Override public void clear() { delegate.clear(); } @Override public int hashCode() { return delegate.hashCode(); } @Override public boolean equals(Object obj) { return delegate.equals(obj); } //計算點擊率 private double getHitRatio() { return (double) hits / (double) requests; } } ~~~