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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.batch.retry;


Interface for listener that can be used to add behaviour to a retry. Implementations of RetryOperations can chose to issue callbacks to an interceptor during the retry lifecycle.

Author(s):
Dave Syer
public interface RetryListener {

Called before the first attempt in a retry. For instance, implementers can set up state that is needed by the policies in the RetryOperations. The whole retry can be vetoed by returning false from this method, in which case a TerminatedRetryException will be thrown.

Parameters:
context the current RetryContext.
callback the current RetryCallback.
Returns:
true if the retry should proceed.
	<T> boolean open(RetryContext contextRetryCallback<T> callback);

Called after the final attempt (successful or not). Allow the interceptor to clean up any resource it is holding before control returns to the retry caller.

Parameters:
context the current RetryContext.
callback the current RetryCallback.
throwable the last exception that was thrown by the callback.
	<T> void close(RetryContext contextRetryCallback<T> callbackThrowable throwable);

Called after every unsuccessful attempt at a retry.

Parameters:
context the current RetryContext.
callback the current RetryCallback.
throwable the last exception that was thrown by the callback.
	<T> void onError(RetryContext contextRetryCallback<T> callbackThrowable throwable);
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