/*
* Copyright 2012 Amazon.com, 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.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.amazonaws.services.simpleworkflow.flow.aspectj;
import java.util.Arrays;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import com.amazonaws.services.simpleworkflow.flow.annotations.ExponentialRetry;
import com.amazonaws.services.simpleworkflow.flow.core.Promise;
import com.amazonaws.services.simpleworkflow.flow.interceptors.ExponentialRetryPolicy;
import com.amazonaws.services.simpleworkflow.flow.interceptors.RetryCallable;
import com.amazonaws.services.simpleworkflow.flow.interceptors.RetryInterceptor;
import com.amazonaws.services.simpleworkflow.flow.interceptors.RetryInterceptorWithResult;
import com.amazonaws.services.simpleworkflow.flow.interceptors.RetryInterceptorVoid;
@Aspect
public class ExponentialRetryAspect {
@Around("execution(@com.amazonaws.services.simpleworkflow.flow.annotations.ExponentialRetry * *(..)) && @annotation(retryAnnotation)")
public Object retry(final ProceedingJoinPoint pjp, ExponentialRetry retryAnnotation) throws Throwable {
ExponentialRetryPolicy retryPolicy = createExponentialRetryPolicy(retryAnnotation);
@SuppressWarnings("rawtypes")
RetryCallable retryCallable = new RetryCallable() {
@Override
public Promise call() throws Throwable {
return (Promise) pjp.proceed();
}
};
boolean isVoidReturnType = false;
final Signature signature = pjp.getStaticPart().getSignature();
if (signature instanceof MethodSignature) {
final MethodSignature methodSignature = (MethodSignature) signature;
isVoidReturnType = (methodSignature != null) ? Void.TYPE.equals(methodSignature.getReturnType()) : false;
}
RetryInterceptor interceptor = null;
if (isVoidReturnType) {
interceptor = new RetryInterceptorVoid(retryCallable, retryPolicy);
} else {
interceptor = new RetryInterceptorWithResult(retryCallable, retryPolicy);
}
return interceptor.execute();
}
private ExponentialRetryPolicy createExponentialRetryPolicy(ExponentialRetry retryAnnotation) {
ExponentialRetryPolicy retryPolicy = new ExponentialRetryPolicy(retryAnnotation.initialRetryIntervalSeconds())
.withExceptionsToRetry(Arrays.asList(retryAnnotation.exceptionsToRetry()))
.withExceptionsToExclude(Arrays.asList(retryAnnotation.excludeExceptions()))
.withBackoffCoefficient(retryAnnotation.backoffCoefficient())
.withMaximumRetryIntervalSeconds(retryAnnotation.maximumRetryIntervalSeconds())
.withRetryExpirationIntervalSeconds(retryAnnotation.retryExpirationSeconds())
.withMaximumAttempts(retryAnnotation.maximumAttempts());
retryPolicy.validate();
return retryPolicy;
}
}