org.apache.ibatis.cache.decorators.LoggingCache.java Source code

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Here is the source code for org.apache.ibatis.cache.decorators.LoggingCache.java

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/**
 *    Copyright 2009-2019 the original author or authors.
 *
 *    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 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) {
        requests++;
        final Object value = delegate.getObject(key);
        if (value != null) {
            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);
    }

    private double getHitRatio() {
        return (double) hits / (double) requests;
    }

}