Implement "LazyList" class which implements iterator interface and encapsulates
paging
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Key: LIBCLOUD-78
URL: https://issues.apache.org/jira/browse/LIBCLOUD-78
Project: Libcloud
Issue Type: Improvement
Components: Storage
Reporter: Tomaz Muraus
Develop a generic LazyList class which implements iterator interface and can be
used with the CloudFiles and S3 driver.
CloudFiles and S3 API limits the maximum number of objects which can be
returned in a single response which means that on subsequent request you need
to provider extra parameters to get the next set of results (marker, prefix,
etc.).
This class should transparently encapsulate this paging process and
list_container_objects() in CloudFiles and S3 method should return an instance
of this class.
The class should also be "lazy" which means that new set of results should only
be requested when the current result set is exhausted.
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