A caching policy for continuous media objects based on logical caches and object partitioning

In this paper, we propose a proxy server management scheme to service continuous media objects on the wide area networks. In the proposed proxy management policy, base on the tree-like proxy server configuration, two physical proxy servers work as one logical cache. Moreover, each object is partitioned into two parts: the front-end and rear-end partition in order to reduce cache space management overhead that the cache space allocation algorithm works in two phases. In the first phase caching, two partitions of the requested object is cached in its corresponding physical proxy server of the logical cache: the front-end partition is cached in the child proxy server while the rear-end one in the parent proxy server. In the second phase, the rear-end partition of the requested object, which has been already cached in the parent proxy server in its first phase caching, will be cached again in the child proxy server of the logical cache depending on their access frequencies.