com.glaf.shiro.cache.guava.GuavaCache.java Source code

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Here is the source code for com.glaf.shiro.cache.guava.GuavaCache.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 com.glaf.shiro.cache.guava;

import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.TimeUnit;

import org.apache.shiro.cache.CacheException;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;

public class GuavaCache<K, V> implements org.apache.shiro.cache.Cache<K, V> {

    protected static final ConcurrentMap<Object, Integer> cacheMap = new ConcurrentHashMap<Object, Integer>();

    protected Cache<Object, Object> cache;

    protected int cacheSize = 100000;

    protected int expireMinutes = 720;

    public GuavaCache(int cacheSize, int expireMinutes) {
        this.cacheSize = cacheSize;
        this.expireMinutes = expireMinutes;
        cache = CacheBuilder.newBuilder().maximumSize(cacheSize).expireAfterAccess(expireMinutes, TimeUnit.MINUTES)
                .build();
    }

    public void clear() throws CacheException {
        getCache().invalidateAll();
        getCache().cleanUp();
        cacheMap.clear();
    }

    public void destroy() throws CacheException {
        getCache().invalidateAll();
        getCache().cleanUp();
        cacheMap.clear();
    }

    @SuppressWarnings("rawtypes")
    public void evict(List keys) throws CacheException {
        if (keys != null && !keys.isEmpty()) {
            for (Object key : keys) {
                getCache().invalidate(key);
                cacheMap.remove(key);
            }
        }
    }

    public void evict(Object key) throws CacheException {
        getCache().invalidate(key);
        cacheMap.remove(key);
    }

    @SuppressWarnings("unchecked")
    public Object get(Object key) throws CacheException {
        return getCache().getIfPresent(key);
    }

    public Cache<Object, Object> getCache() {
        if (cache == null) {
            cache = CacheBuilder.newBuilder().maximumSize(getCacheSize())
                    .expireAfterAccess(getExpireMinutes(), TimeUnit.MINUTES).build();
        }
        return cache;
    }

    public int getCacheSize() {
        return cacheSize;
    }

    public int getExpireMinutes() {
        return expireMinutes;
    }

    @SuppressWarnings("unchecked")
    public Set<K> keys() {
        Set<K> keys = new HashSet<K>();
        Set<Object> set = cacheMap.keySet();
        Iterator<Object> iterator = set.iterator();
        while (iterator.hasNext()) {
            K key = (K) iterator.next();
            keys.add(key);
        }
        return keys;
    }

    public V put(K key, V value) throws CacheException {
        getCache().put(key, value);
        cacheMap.put(key, 1);
        return null;
    }

    public V remove(K key) throws CacheException {
        getCache().invalidate(key);
        cacheMap.remove(key);
        return null;
    }

    public void setCacheSize(int cacheSize) {
        this.cacheSize = cacheSize;
    }

    public void setExpireMinutes(int expireMinutes) {
        this.expireMinutes = expireMinutes;
    }

    public int size() {
        return (int) getCache().size();
    }

    public void update(Object key, Object value) throws CacheException {
        getCache().put(key, value);
        cacheMap.remove(key);
    }

    @SuppressWarnings("unchecked")
    public Collection<V> values() {
        Collection<V> values = new HashSet<V>();
        Set<Object> set = cacheMap.keySet();
        Iterator<Object> iterator = set.iterator();
        while (iterator.hasNext()) {
            K key = (K) iterator.next();
            V value = (V) getCache().getIfPresent(key);
            values.add(value);
        }
        return values;
    }

}