Dynamic Object Cache Invalidation via HTTP Header Analysis
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Solution Overview
Problem
Traditional caching technologies are inadequate for handling dynamically generated content due to the lack of standards for caching such content, complexity in identifying and processing dynamic requests, and the challenge of maintaining the freshness of cached data, which leads to inefficiencies and increased server load.
Innovation Solution
A method and system that utilize heuristics to predict the behavior of application servers, intercept and parse communications to identify object determinants, and implement invalidation commands to manage dynamically generated objects in cache, allowing for timely invalidation and efficient storage of dynamic content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional caching is used for static content, then response time is improved and server load is reduced, but dynamically generated content cannot be cached effectively
Solution Approach 1:
The patent applies dynamics by making the caching system adaptive to dynamic content. The cache manager dynamically determines whether content is cacheable by analyzing HTTP headers and content characteristics, rather than using static caching rules. This allows the system to handle both static and dynamic content appropriately, improving versatility while maintaining performance benefits.
Solution Approach 2:
The patent changes the parameter of cacheability from a fixed static property to a dynamic determination based on multiple factors including HTTP headers (Cache-Control, Expires, Last-Modified), content type, and content characteristics. This parameter change enables the system to cache dynamic content when appropriate while maintaining the ability to serve fresh content when needed.
2Productivity
If dynamically generated content is cached without validation, then server load is reduced, but data freshness cannot be ensured
Solution Approach 1:
The patent implements feedback mechanisms where the cache manager continuously monitors content freshness using HTTP validation headers (If-Modified-Since, If-None-Match, ETag). The system receives feedback from the origin server about content changes and automatically invalidates or updates cached content accordingly. This feedback loop ensures data freshness while maintaining the performance benefits of caching.
Solution Approach 2:
The patent performs preliminary validation actions before serving cached content. The cache manager pre-checks content freshness using validation headers and establishes validity periods for cached objects. By performing these validation actions in advance, the system ensures that only fresh content is served while maintaining efficient cache operations.
3Reliability
If all dynamic requests are processed without caching, then data freshness is maintained, but network bandwidth and processing requirements increase
Solution Approach 1:
The patent applies partial caching by selectively caching only those dynamic content objects that meet specific cacheability criteria. Rather than caching all content or none at all, the system performs partial validation and caching of dynamic objects based on their characteristics, HTTP headers, and content type. This partial action approach reduces bandwidth and processing requirements for eligible content while maintaining freshness for content that requires always-updated delivery.
4Reliability
If complex validation mechanisms are implemented to ensure dynamic content freshness, then data reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal cache manager that handles multiple validation strategies and content types through a single integrated system. The cache manager can process different HTTP validation methods (If-Modified-Since, If-None-Match, ETag, Cache-Control headers) and apply appropriate validation logic based on content characteristics. This multi-functional approach improves reliability through comprehensive validation while reducing complexity by consolidating validation mechanisms into a single management system.
Data Source
AI summary
A method for maintaining a cache of dynamically generated objects. The method includes storing in the cache dynamically generated objects previously served from an originating server to a client. A communication between the client and server is intercepted by the cache. The cache parses the communication to identify an object determinant and to determine whether the object determinant indicates whether a change has occurred or will occur in an object at the originating server. The cache marks the object stored in the cache as invalid if the object determinant so indicates. If the object has been marked as invalid, the cache retrieves the object from the originating server.