com.amazonaws.services.simpleworkflow.flow.aspectj.ExponentialRetryAspect Maven / Gradle / Ivy

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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2012-2014 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.DecisionContextProviderImpl;
import com.amazonaws.services.simpleworkflow.flow.WorkflowClock;
import com.amazonaws.services.simpleworkflow.flow.annotations.ExponentialRetry;
import com.amazonaws.services.simpleworkflow.flow.core.Promise;
import com.amazonaws.services.simpleworkflow.flow.core.Settable;
import com.amazonaws.services.simpleworkflow.flow.interceptors.AsyncExecutor;
import com.amazonaws.services.simpleworkflow.flow.interceptors.AsyncRetryingExecutor;
import com.amazonaws.services.simpleworkflow.flow.interceptors.AsyncRunnable;
import com.amazonaws.services.simpleworkflow.flow.interceptors.ExponentialRetryPolicy;

@Aspect
public class ExponentialRetryAspect {

    @SuppressWarnings({ "rawtypes", "unchecked" })
    private final class DecoratorInvocationHandler implements AsyncRunnable {

        private final ProceedingJoinPoint pjp;

        private final Settable result;

        public DecoratorInvocationHandler(ProceedingJoinPoint pjp, Settable result) {
            this.pjp = pjp;
            this.result = result;
        }

        @Override
        public void run() throws Throwable {
            if (result != null) {
                result.unchain();
                result.chain((Promise) pjp.proceed());
            } else {
                pjp.proceed();
            }
        }
    }

    @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);

        WorkflowClock clock = new DecisionContextProviderImpl().getDecisionContext().getWorkflowClock();
        AsyncExecutor executor = new AsyncRetryingExecutor(retryPolicy, clock);

        Settable result;
        if (isVoidReturnType(pjp)) {
            result = null;
        }
        else {
            result = new Settable