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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;
/**
* Can be used with {@link RepositoryBuilder} to automatically register
* triggers as Storable types become available.
*
* @author Brian S O'Neill
*/
public interface TriggerFactory {
/**
* Return an appropriate trigger for the given type, or null if none. This
* method is expected to be called at most once per Storable type. As an
* extra safeguard, trigger implementations are encouraged to implement the
* equals method.
*
* @param type Storable type requesting an automatic trigger
* @return trigger instance or null if not applicable
*/
<S extends Storable> Trigger<? super S> triggerFor(Class<S> type) throws RepositoryException;
}
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