11.2. The EDH Component Model
As mentioned previously, the existing EDH architecture is based on the EJB specification, but it does not use any commercial EJB container. Figure 11.1 summarizes the main components of the existing EDH architecture.
Figure 11.1. CERN's Electronic Document Handling Application Architecture
11.2.1. EDH Document Servlet
Each electronic document in EDH has its own specific Document servlet. The role of the document servlet is that of a dispatcher. It uses a cookie stored on the user's browser to identify the user's ServletExecutor instance and then forwards the call directly to it.
11.2.2. EDH ServletExecutor
The ServletExecutor ...
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