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Spring Retry provides an abstraction around retrying failed operations, with an emphasis on declarative control of the process and policy-based bahaviour that is easy to extend and customize. For instance, you can configure a plain POJO operation to retry if it fails, based on the type of exception, and with a fixed or exponential backoff.

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/*
 * Copyright 2006-2007 the original author or authors.
 *
 * 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 org.springframework.classify;

/**
 * Interface for a classifier. At its simplest a {@link Classifier} is just a
 * map from objects of one type to objects of another type.
 * 
 * @author Dave Syer
 * 
 */
public interface Classifier {

	/**
	 * Classify the given object and return an object of a different type,
	 * possibly an enumerated type.
	 * 
	 * @param classifiable the input object. Can be null.
	 * @return an object. Can be null, but implementations should declare if
	 * this is the case.
	 */
	T classify(C classifiable);

}