com.amazonaws.services.simpleworkflow.flow.interceptors.RetryPolicyBase 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.interceptors;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import com.amazonaws.services.simpleworkflow.flow.DecisionException;


public abstract class RetryPolicyBase implements RetryPolicy {
    
    private List> exceptionsToRetry;
    
    private List> exceptionsToExclude;
    
    public List> getExceptionsToRetry() {
        if (exceptionsToRetry == null) {
            exceptionsToRetry = new ArrayList>();
            exceptionsToRetry.add(Throwable.class);
        }
        return exceptionsToRetry;
    }

    public void setExceptionsToRetry(List> exceptionsToRetry) {
        List> exceptionsToRetryCopy = new ArrayList>();
        if (exceptionsToRetry != null) {
            exceptionsToRetryCopy.addAll(exceptionsToRetry);
        }
        
        this.exceptionsToRetry = exceptionsToRetryCopy;
    }
    
    public RetryPolicyBase withExceptionsToRetry(Collection> exceptionsToRetry) {
        List> exceptionsToRetryCopy = new ArrayList>();
        if (exceptionsToRetry != null) {
            exceptionsToRetryCopy.addAll(exceptionsToRetry);
        }
        
        this.exceptionsToRetry = exceptionsToRetryCopy;
        return this;
    }
    
    public List> getExceptionsToExclude() {
        if (exceptionsToExclude == null) {
            exceptionsToExclude = new ArrayList>();
        }
        return exceptionsToExclude;
    }
    
    public void setExceptionsToExclude(List> exceptionsToExclude) {
        List> exceptionsToExcludeCopy = new ArrayList>();
        if (exceptionsToExclude != null) {
            exceptionsToExcludeCopy.addAll(exceptionsToExclude);
        }
        
        this.exceptionsToExclude = exceptionsToExcludeCopy;
    }
    
    public RetryPolicyBase withExceptionsToExclude(Collection> exceptionsToExclude) {
        List> exceptionsToExcludeCopy = new ArrayList>();
        if (exceptionsToExclude != null) {
            exceptionsToExcludeCopy.addAll(exceptionsToExclude);
        }
        
        this.exceptionsToExclude = exceptionsToExcludeCopy;
        return this;
    }

    @Override
    public boolean isRetryable(Throwable failure) {
        boolean isRetryable = false;
        
        if (failure instanceof DecisionException && failure.getCause() != null) {
            failure = failure.getCause();
        }
        
        for (Class exceptionToRetry: getExceptionsToRetry()) {
            if (exceptionToRetry.isAssignableFrom(failure.getClass())) {
                isRetryable = true;
                break;
            }
        }
        
        if (isRetryable) {
            for (Class exceptionNotToRetry: getExceptionsToExclude()) {
                if (exceptionNotToRetry.isAssignableFrom(failure.getClass())) {
                    isRetryable = false;
                    break;
                }
            }
        }
        
        return isRetryable;
    }
}