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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 2010-2014 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.retry;

import com.amazonaws.AmazonServiceException;

public class RetryUtils {
    
    /**
     * Returns true if the specified exception is a throttling error.
     *
     * @param ase
     *            The exception to test.
     *
     * @return True if the exception resulted from a throttling error message
     *         from a service, otherwise false.
     */
    public static boolean isThrottlingException(AmazonServiceException ase) {
        if (ase == null) return false;
        
        String errorCode = ase.getErrorCode();
        return "Throttling".equals(errorCode)
            || "ThrottlingException".equals(errorCode)
            || "ProvisionedThroughputExceededException".equals(errorCode);
    }
    
    /**
     * Returns true if the specified exception is a request entity too large
     * error.
     *
     * @param ase
     *            The exception to test.
     *
     * @return True if the exception resulted from a request entity too large
     *         error message from a service, otherwise false.
     */
    public static boolean isRequestEntityTooLargeException(AmazonServiceException ase) {
        if (ase == null) return false;
        return "Request entity too large".equals(ase.getErrorCode());
    }
    
    /**
     * Returns true if the specified exception is a clock skew error.
     *
     * @param ase
     *            The exception to test.
     *
     * @return True if the exception resulted from a clock skews error message
     *         from a service, otherwise false.
     */
    public static boolean isClockSkewError(AmazonServiceException ase) {
        if (ase == null) return false;

        String errorCode = ase.getErrorCode();
        return "RequestTimeTooSkewed".equals(errorCode)
                || "RequestExpired".equals(errorCode)
                || "InvalidSignatureException".equals(errorCode)
                || "SignatureDoesNotMatch".equals(errorCode);
    }
}