Blackberry WALLET 1.2 - RELEASE NOTES Przewodnik Instalacji Pobierz pdf (Strona 10)

Oracle White Paper—Oracle Portal Enterprise Deployment Guide: 11.1.1.2

Understanding the Web Tier

The Web Tier is in the DMZ Public Zone. Web Cache and HTTP Servers are deployed in the

Web Tier.

Web Cache is the first point on entry into the site, it performs two functions; Its primary

function is to serve static web content from its cache, much faster than could be achieved by the

Oracle HTTP Servers alone. If Web Cache does not have a cacheable page in its cache or that

page is not current, then Web Cache will request the page from the attached Oracle HTTP

server(s).

The second function of Web Cache is to load balance requests between several Oracle HTTP

Servers.

The Oracle HTTP Server is responsible for assembling pages requested by the user. Page

assembly is not always straightforward however. Depending on how the page is made up the

Oracle HTTP Server will perform one of the following:

• If the page is a simple HTML document, then the Web Tier will find and return the

document.

• If the web page needs to be assembled by executing a Java J2EE application then the

Oracle Web Tier will route the request to Oracle WebLogic server, which after

processing the request will send the result back to the user via the Oracle Web Tier.

• If the web page needs to be assembled by executing some other application such as

PLSQL or CGI then the Oracle Web Tier will route the request to the appropriate

application, and once that application has processed the request, it will send the result

back to the user via the Oracle Web Tier.

• If the page being requested is protected, then the Oracle Web Server will invoke Oracle

Identity Management (Single Sign On) to ensure that the user is authorized to view the

requested page.

The Oracle HTTP Server uses an Apache module called mod_wl_ohs to route requests to

WebLogic Managed Servers. In this implementation the WebLogic managed Servers

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Blackberry WALLET 1.2 - RELEASE NOTES Przewodnik Instalacji Strona 10