18.1. The need for connectivity
To understand why we need connectors, consider the simple application shown in outline in Figure 18.1. This EJB application uses a ‘stock quote server’ to retrieve current prices of a range of traded stocks. The quote server implements a custom protocol carried over TCP/IP, where clients connect, authenticate themselves, retrieve whatever quotes they require, and then disconnect.
Figure 18.1. An EJB application that makes use of a custom quote server. EJBs open network connections as required, download prices, then disconnect.
Of course this is just one example: EJB applications frequently need to communicate ...
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