com.isotrol.impe3.web20.impl.ResourceComponent.java Source code

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Here is the source code for com.isotrol.impe3.web20.impl.ResourceComponent.java

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/**
 * This file is part of Port@l
 * Port@l 3.0 - Portal Engine and Management System
 * Copyright (C) 2010  Isotrol, SA.  http://www.isotrol.com
 *
 * Port@l 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 3 of the License, or
 * (at your option) any later version.
 *
 * Port@l 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 Port@l.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.isotrol.impe3.web20.impl;

import org.springframework.stereotype.Component;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.isotrol.impe3.web20.model.ResourceEntity;
import com.isotrol.impe3.web20.server.ResourceManager;

/**
 * Resource component.
 * @author Andres Rodriguez.
 */
@Component
public final class ResourceComponent extends AbstractMapComponent<String> implements ResourceManager {
    private final LoadingCache<Long, String> cache;

    /** Default constructor. */
    public ResourceComponent() {
        final CacheLoader<Long, String> computer = new CacheLoader<Long, String>() {
            public String load(Long from) {
                return findById(ResourceEntity.class, from).getResourceId();
            }
        };
        cache = CacheBuilder.newBuilder().softValues().build(computer);
    }

    /**
     * @see com.isotrol.impe3.web20.server.ResourceManager#getResource(java.lang.String)
     */
    public long getResource(String key) {
        return get(key);
    }

    public String getResourceById(long id) {
        return cache.getUnchecked(id);
    }

    /**
     * @see com.isotrol.impe3.web20.impl.AbstractMapComponent#compute(java.lang.String)
     */
    @Override
    Long compute(String key) {
        ResourceEntity entity = getDao().getResourceById(key);
        if (entity == null) {
            entity = new ResourceEntity();
            entity.setResourceId(key);
            getDao().save(entity);
            flush();
        }
        Long id = entity.getId();
        cache.put(id, key);
        return id;
    }
}