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Recently, Solaris has begun a transition to Lightweight Directory Access Protocol (LDAP) directory services as an alternative source of authoritative information for naming, identification, and authentication. LDAP is based on the original Directory Access Protocol (DAP), which provided X.500-type services for centralized directory lookups. Like NIS and NIS+, LDAP performs lookups, given a token, and returns a result. However, the query is much more generalized than what can be returned from NIS or NIS+: text, sounds, and graphics can all be associated with an entry in the directory. While LDAP does not provide any kind of programmatic query language, like SQL, to query the directory, it does provide a standard interface to search the hierarchical namespace (ldapsearch). Since it works directly over TCP/IP and can support directory services for clients on different operating systems, LDAP is often viewed as the future central naming and directory service for Solaris.
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Java is a relatively new programming language that is often used to create platformindependent GUIs that a user can interact with in complex and sophisticated ways. However, Java applets the bits of code that are transmitted over the Internet and executed on the user s machine are only one side of the whole Java story. This section focuses on the server side of Java. Simple Java applications that execute on the server are called servlets, and they have their own standard API specification that has now been widely implemented in Web server extension products known as servlet runners (such as Apache s Tomcat server). Servlets are useful in developing Web-enabled, Solaris-based enterprise applications. Increasingly, applications in the enterprise are being implemented using Web interfaces, partly in response to the persistent heterogeneity of computing platforms within organizations that span cities, states, and even nations. Accepting platform diversity does not mean losing control of standards, however. Sun Microsystems has pioneered a platform-independent programming language in which applications run on top of a logical Java Virtual Machine (JVM) that presents a consistent API for developers. Most major hardware platforms and operating systems now have virtual machines implemented, including (obviously) Solaris. In fact, the Solaris JVM produced by Sun has been highly optimized in its production release series. JVMs have also been integrated into popular Web browsers, so that Java programs can be downloaded from a server and executed within these browsers. (HTML has an <applet> tag that facilitates this process.) Applets have increased the complexity of Web-based user interfaces from simple arrays of buttons and forms to dynamic interaction with the user in a way that is similar to a normal desktop application. The Java 2 Enterprise Edition (J2EE) is an extension of Java that aims to provide a complete enterprise architecture for delivering applications over the Web. J2EE is designed around a basic four-tier model including client, presentation, business logic, and data tiers that is sufficient to build new applications in a way that separates display logic from back-end data processing functions. In addition, J2EE features a component model that supports both stateless and stateful operations, transactional access to relational
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databases, and components that participate in asynchronous messaging. J2EE allows platform-independent enterprise applications to be executed through a standard Web interface, changing the way that users, developers, and software interact. The write once, run anywhere philosophy means that servers with totally different operating systems and hardware can be replaced with newer systems, without concern for application stability and porting. How does server-side Java compare to Web-based client/server techniques such as the combination of a Common Gateway Interface (CGI) and a non-object-oriented language such as C Although a compiled language like C is faster on a byte-per-byte basis than an interpreted language like Java, performance increases for Java can be gained by the combination of optimizing just-in-time (JIT) compilers for specific platforms and reducing the process and memory overhead associated with the CGI. For example, if you wrote a search application in Perl that is accessed by 1,000 Web users per hour, that would mean an extra 1,000 invocations of Perl that the server has to deal with, unless you used a specialized module. Of course, if you are running on a Sun Fire 15K, this would probably result in a negligible system strain. For other systems, invoking a Java servlet that occupies only a single process after being loaded into memory, and which persists across sessions, is both memory and process efficient. Servlets are therefore more appropriate for applications that are constantly being executed by multiple users, because they take advantage of Java s multithreading and synchronization capabilities. On the flip side, CGI programs are often better suited to single-user, infrequently used, and numerically intensive applications that might be invoked only once per hour. In addition, CGI programs written in C are logically isolated from each other in the server s memory space: if Java servlets are executed using a single instance of a service manager (for example, Live Software s JRun), an unhandled exception arising from malformed or unexpected input could potentially impact all servlets running through the manager, especially if the JVM crashes.
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