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/*
* Copyright 2006-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* Licensed 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.amazon.carbonado.spi;
import com.amazon.carbonado.MalformedTypeException;
import com.amazon.carbonado.RepositoryException;
import com.amazon.carbonado.Storable;
import com.amazon.carbonado.Storage;
import com.amazon.carbonado.SupportException;
import com.amazon.carbonado.util.AbstractPool;
/**
* A concurrent pool of strongly referenced Storage instances mapped by
* Storable type. Storage instances are lazily created and pooled.
*
* @author Brian S O'Neill
* @since 1.2
*/
public abstract class StoragePool
extends AbstractPool<Class, Storage, RepositoryException>
{
public StoragePool() {
}
/**
* Returns a Storage instance for the given Storable type, which is lazily
* created and pooled. If multiple threads are requesting upon the same type
* concurrently, at most one thread attempts to lazily create the
* Storage. The others wait for it to become available.
*/
public <S extends Storable> Storage<S> getStorage(Class<S> type)
throws MalformedTypeException, SupportException, RepositoryException
{
return (Storage<S>) super.get(type);
}
@Override
protected final Storage create(Class type) throws SupportException, RepositoryException {
return createStorage(type);
}
protected abstract <S extends Storable> Storage<S> createStorage(Class<S> type)
throws SupportException, RepositoryException;
}
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