code: @Override
      public CacheSecurityGroup authorizeCacheSecurityGroupIngress(AuthorizeCacheSecurityGroupIngressRequest request) {
          request = beforeClientExecution(request);
          return executeAuthorizeCacheSecurityGroupIngress(request);
      }
docs: <p>
  Allows network ingress to a cache security group. Applications using ElastiCache must be running on Amazon EC2,
  and Amazon EC2 security groups are used as the authorization mechanism.
  </p>
  <note>
  <p>
  You cannot authorize ingress from an Amazon EC2 security group in one region to an ElastiCache cluster in another
  region.
  </p>
  </note>
  
  @param authorizeCacheSecurityGroupIngressRequest
  Represents the input of an AuthorizeCacheSecurityGroupIngress operation.
  @return Result of the AuthorizeCacheSecurityGroupIngress operation returned by the service.
  @throws CacheSecurityGroupNotFoundException
  The requested cache security group name does not refer to an existing cache security group.
  @throws InvalidCacheSecurityGroupStateException
  The current state of the cache security group does not allow deletion.
  @throws AuthorizationAlreadyExistsException
  The specified Amazon EC2 security group is already authorized for the specified cache security group.
  @throws InvalidParameterValueException
  The value for a parameter is invalid.
  @throws InvalidParameterCombinationException
  Two or more incompatible parameters were specified.
  @sample AmazonElastiCache.AuthorizeCacheSecurityGroupIngress
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/elasticache-2015-02-02/AuthorizeCacheSecurityGroupIngress"
  target="_top">AWS API Documentation</a>