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Kryo based Serializer for SynchronizeFX
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/**
 * This file is part of SynchronizeFX.
 * 
 * Copyright (C) 2013-2014 Saxonia Systems AG
 *
 * SynchronizeFX is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * SynchronizeFX 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with SynchronizeFX. If not, see .
 */

package de.saxsys.synchronizefx.kryo;

import java.util.LinkedList;
import java.util.List;
import java.util.UUID;

import de.saxsys.synchronizefx.core.metamodel.commands.AddToList;
import de.saxsys.synchronizefx.core.metamodel.commands.RemoveFromList;
import de.saxsys.synchronizefx.core.metamodel.commands.ReplaceInList;
import de.saxsys.synchronizefx.core.metamodel.commands.SetPropertyValue;
import de.saxsys.synchronizefx.core.metamodel.commands.Value;
import de.saxsys.synchronizefx.kryo.serializer.AddToListSerializer;
import de.saxsys.synchronizefx.kryo.serializer.RemoveFromListSerializer;
import de.saxsys.synchronizefx.kryo.serializer.ReplaceInListSerializer;
import de.saxsys.synchronizefx.kryo.serializer.SetPropertyValueSerializer;
import de.saxsys.synchronizefx.kryo.serializer.UUIDSerializer;
import de.saxsys.synchronizefx.kryo.serializer.ValueSerializer;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;

/**
 * Initializes {@link Kryo} instances with all the Serializers needed for SynchronizeFX and the one the user
 * registerend.
 * 
 * A new {@link Kryo} instance is created for each {@link Thread} to ensure thread-safety.
 */
final class KryoInitializer extends ThreadLocal {

    private List> customSerializers = new LinkedList<>();

    @Override
    protected Kryo initialValue() {
        Kryo kryo = new Kryo();
        kryo.register(UUID.class, new UUIDSerializer());
        kryo.register(Value.class, new ValueSerializer());
        kryo.register(SetPropertyValue.class, new SetPropertyValueSerializer());
        kryo.register(AddToList.class, new AddToListSerializer());
        kryo.register(RemoveFromList.class, new RemoveFromListSerializer());
        kryo.register(ReplaceInList.class, new ReplaceInListSerializer());

        synchronized (customSerializers) {
            for (CustomSerializers serializer : customSerializers) {
                if (serializer.serializer != null) {
                    kryo.register(serializer.clazz, serializer.serializer);
                } else {
                    kryo.register(serializer.clazz);
                }
            }
        }
        return kryo;
    }

    /**
     * See {@link KryoSerializer#registerSerializableClass(Class, Serializer)}.
     * 
     * @param clazz see {@link KryoSerializer#registerSerializableClass(Class, Serializer)}.
     * @param serializer see {@link KryoSerializer#registerSerializableClass(Class, Serializer)}.
     * @param  see {@link KryoSerializer#registerSerializableClass(Class, Serializer)}.
     * @see KryoSerializer#registerSerializableClass(Class, Serializer)
     */
     void registerSerializableClass(final Class clazz, final Serializer serializer) {
        synchronized (customSerializers) {
            customSerializers.add(new CustomSerializers<>(clazz, serializer));
        }
    }

    /**
     * A simple storage class for {@link Class} that should be serialized and the {@link Serializer} to use.
     * 
     * @param  The class to serialize.
     */
    private static class CustomSerializers {
        private final Class clazz;
        private final Serializer serializer;

        CustomSerializers(final Class clazz, final Serializer serializer) {
            this.clazz = clazz;
            this.serializer = serializer;
        }
    }
}