alfresco-community-repo/source/test-java/org/alfresco/repo/cache/SerializingSimpleCache.java

package org.alfresco.repo.cache;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Collection;

import org.springframework.beans.factory.BeanNameAware;

/**
 * {@link SimpleCache} implementation backed by a {@link DefaultSimpleCache} but forcing
 * object serialization in and out.  This is only useful for tests.
 * 
 * @author Derek Hulley
 * @since 4.2.3
 */
public final class SerializingSimpleCache<K extends Serializable, V extends Serializable>
    implements SimpleCache<K, V>, BeanNameAware
{
    private SimpleCache<K, V> cache;
    
    public SerializingSimpleCache(int maxItems, String cacheName)
    {
        cache = new DefaultSimpleCache<>(maxItems, cacheName);
    }
    
    public SerializingSimpleCache()
    {
        cache = new DefaultSimpleCache<>();
    }
    
    @SuppressWarnings("unchecked")
    private V serialize(V value)
    {
        if (value == null)
        {
            return null;
        }
        try
        {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(bos);
            oos.writeObject(value);
            byte[] bytes = bos.toByteArray();
            ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
            ObjectInputStream ois = new ObjectInputStream(bis);
            V ret = (V) ois.readObject();
            // This is just test code!
            bos.close();
            oos.close();
            bis.close();
            ois.close();
            // Done
            return ret;
        }
        catch (Exception e)
        {
            throw new RuntimeException("Failure to serialize/deserialize object: " + value, e);
        }
    }
    
    @Override
    public boolean contains(K key)
    {
        return cache.contains(key);
    }

    @Override
    public Collection<K> getKeys()
    {
        return cache.getKeys();
    }

    @Override
    public V get(K key)
    {
        V ret = cache.get(key);
        return serialize(ret);
    }

    @Override
    public void put(K key, V value)
    {
        value = serialize(value);
        cache.put(key, value);
    }

    @Override
    public void remove(K key)
    {
        cache.remove(key);
    }

    @Override
    public void clear()
    {
        cache.clear();
    }

    @Override
    public void setBeanName(String cacheName)
    {
    }
}