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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.retry;

/**
 * A {@link RetryPolicy} is responsible for allocating and managing resources
 * needed by {@link RetryOperations}. The {@link RetryPolicy} allows retry
 * operations to be aware of their context. Context can be internal to the retry
 * framework, e.g. to support nested retries. Context can also be external, and
 * the {@link RetryPolicy} provides a uniform API for a range of different
 * platforms for the external context.
 * 
 * @author Dave Syer
 * 
 */
public interface RetryPolicy {

	/**
	 * @param context the current retry status
	 * @return true if the operation can proceed
	 */
	boolean canRetry(RetryContext context);

	/**
	 * Acquire resources needed for the retry operation. The callback is passed
	 * in so that marker interfaces can be used and a manager can collaborate
	 * with the callback to set up some state in the status token.
	 * @param parent the parent context if we are in a nested retry.
	 * 
	 * @return a {@link RetryContext} object specific to this manager.
	 * 
	 */
	RetryContext open(RetryContext parent);

	/**
	 * @param context a retry status created by the
	 * {@link #open(RetryContext)} method of this manager.
	 */
	void close(RetryContext context);

	/**
	 * Called once per retry attempt, after the callback fails.
	 * 
	 * @param context the current status object.
	 * 
	 */
	void registerThrowable(RetryContext context, Throwable throwable);

}