Seamless Service Access via Resource Replication

Replication is a well-known technique for improving data availability and application performance as it allows to collocate data and code. However, there are several relevant difficulties that must be solved to take full advantage of replication; we address the following: i) replica management, ii) memory management, and iii) adaptability. We present an archetypical architecture for mobile middleware that is used along this chapter, the mechanisms supporting how and which data is replicated (both for the object and file models), the solution for the garbage collection of replicas, and the policies allowing applications to control objects replication.