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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 behaviour 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;

import org.springframework.retry.support.DefaultRetryState;

/**
 * Defines the basic set of operations implemented by {@link RetryOperations} to
 * execute operations with configurable retry behaviour.
 * 
 * @author Rob Harrop
 * @author Dave Syer
 */
public interface RetryOperations {

	/**
	 * Execute the supplied {@link RetryCallback} with the configured retry
	 * semantics. See implementations for configuration details.
	 * 
	 * @return the value returned by the {@link RetryCallback} upon successful
	 * invocation.
	 * @throws E any {@link Exception} raised by the
	 * {@link RetryCallback} upon unsuccessful retry.
	 * @throws E the exception thrown
	 * @param  the return value
	 * @param retryCallback the {@link RetryCallback}
	 * @param  the exception to throw
	 */
	 T execute(RetryCallback retryCallback) throws E;

	/**
	 * Execute the supplied {@link RetryCallback} with a fallback on exhausted
	 * retry to the {@link RecoveryCallback}. See implementations for
	 * configuration details.
	 * 
	 * @return the value returned by the {@link RetryCallback} upon successful
	 * invocation, and that returned by the {@link RecoveryCallback} otherwise.
	 * @throws E any {@link Exception} raised by the
	 * @param  the type to return
	 * @param  the type of the exception
	 * @param recoveryCallback the {@link RecoveryCallback}
	 * @param retryCallback the {@link RetryCallback}
	 * {@link RecoveryCallback} upon unsuccessful retry.
	 */
	 T execute(RetryCallback retryCallback, RecoveryCallback recoveryCallback) throws E;

	/**
	 * A simple stateful retry. Execute the supplied {@link RetryCallback} with
	 * a target object for the attempt identified by the {@link DefaultRetryState}.
	 * Exceptions thrown by the callback are always propagated immediately so
	 * the state is required to be able to identify the previous attempt, if
	 * there is one - hence the state is required. Normal patterns would see
	 * this method being used inside a transaction, where the callback might
	 * invalidate the transaction if it fails.
	 * 
	 * See implementations for configuration details.
	 *
	 * @param retryCallback the {@link RetryCallback}
	 * @param retryState the {@link RetryState}
	 * @return the value returned by the {@link RetryCallback} upon successful
	 * invocation, and that returned by the {@link RecoveryCallback} otherwise.
	 * @throws E any {@link Exception} raised by the {@link RecoveryCallback}.
	 * @throws ExhaustedRetryException if the last attempt for this state has
	 * already been reached
	 * @param  the type of the return value
	 * @param  the type of the exception to return
	 */
	 T execute(RetryCallback retryCallback, RetryState retryState) throws E, ExhaustedRetryException;

	/**
	 * A stateful retry with a recovery path. Execute the supplied
	 * {@link RetryCallback} with a fallback on exhausted retry to the
	 * {@link RecoveryCallback} and a target object for the retry attempt
	 * identified by the {@link DefaultRetryState}.
	 * @param recoveryCallback the {@link RecoveryCallback}
	 * @param retryState the {@link RetryState}
	 * @param retryCallback the {@link RetryCallback}
	 * @see #execute(RetryCallback, RetryState)
	 * @param  the return value type
	 * @param  the exception type
	 * @return 	the value returned by the {@link RetryCallback} upon successful
	 * 			invocation, and that returned by the {@link RecoveryCallback} otherwise.
	 * @throws E any {@link Exception} raised by the {@link RecoveryCallback} upon unsuccessful retry.
	 */
	 T execute(RetryCallback retryCallback, RecoveryCallback recoveryCallback, RetryState retryState)
			throws E;

}