MemoryCacheStore.java

/*
 * Password Management Servlets (PWM)
 * http://www.pwm-project.org
 *
 * Copyright (c) 2006-2009 Novell, Inc.
 * Copyright (c) 2009-2017 The PWM Project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package password.pwm.svc.cache;

import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.Caffeine;
import password.pwm.error.PwmUnrecoverableException;

import java.time.Instant;

class MemoryCacheStore implements CacheStore {
    private final Cache<String,CacheValueWrapper> memoryStore;
    private final CacheStoreInfo cacheStoreInfo = new CacheStoreInfo();

    MemoryCacheStore(final int maxItems) {
        memoryStore = Caffeine.newBuilder()
                .maximumSize(maxItems)
                .build();
    }

    @Override
    public void store(final CacheKey cacheKey, final Instant expirationDate, final String data)
            throws PwmUnrecoverableException {
        cacheStoreInfo.getStoreCount();
        memoryStore.put(cacheKey.getHash(), new CacheValueWrapper(cacheKey, expirationDate, data));
    }

    @Override
    public String read(final CacheKey cacheKey)
            throws PwmUnrecoverableException 
    {
        cacheStoreInfo.getReadCount();
        final CacheValueWrapper valueWrapper = memoryStore.getIfPresent(cacheKey.getHash());
        if (valueWrapper != null) {
            if (cacheKey.equals(valueWrapper.getCacheKey())) {
                if (valueWrapper.getExpirationDate().isAfter(Instant.now())) {
                    cacheStoreInfo.incrementHitCount();
                    return valueWrapper.getPayload();
                }
            }
        }
        memoryStore.invalidate(cacheKey.getHash());
        cacheStoreInfo.incrementMissCount();
        return null;
    }

    @Override
    public CacheStoreInfo getCacheStoreInfo() {
        return cacheStoreInfo;
    }

    @Override
    public int itemCount()
    {
        return (int)memoryStore.estimatedSize();
    }
}