Given a (growing) set of URLs, can periodically check to see if any of the underlying resources has changed. This class is capable of using either millisecond-level granularity or second-level granularity. Millisecond-level granularity is used by default. Second-level granularity is provided for compatibility with browsers vis-a-vis resource caching -- that's how granular they get with their "If-Modified-Since", "Last-Modified" and "Expires" headers.
Given a (growing) set of URLs, can periodically check to see if any of the underlying resources has changed. This class is capable of using either millisecond-level granularity or second-level granularity. Millisecond-level granularity is used by default. Second-level granularity is provided for compatibility with browsers vis-a-vis resource caching -- that's how granular they get with their "If-Modified-Since", "Last-Modified" and "Expires" headers.
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