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RMI presents some unique difficulties for applets Aside from issues of RMI support in Internet Explorer (discussed earlier), there is also the problem of applet network restrictions These restrictions can be very serious, and prevent RMI-based applets from communicating with RMI services 111031 Inability to Bind to TCP Ports Since an applet can't bind to a TCP port, it cannot be an RMI server While not every applet will need this functionality, it does mean that RMI services cannot be run from inside a Web browser This means that callbacks cannot be easily implemented using RMI a client applet can invoke methods on a server, but cannot export a remote object and have it invoked during the callback by another service 111032 Restrictions on Network Connections An applet can only connect to the host machine from which its codebase was loaded When an applet is loaded from a machine, such as wwwdavidreillycom, for example, it can only make TCP and UDP connections to that server (see Figure 11-5) This is a restriction placed on applets by browsers; while the restriction is in the best interest of users, it limits developers Figure 11-5 Applets are restricted in their ability to make network connections

Before the user can call the methods of this client, it must first be initializedYou may notice that the only constructor argument in this class is a service URL Proper initialization also requires valid account credentialsAn important consideration early in the development of this client is the safeguarding of the user s account credentials First, we want to be careful how we store the Secret Access Key It is impossible to predict where this client code might end up running somedayYou do not want to be in a situation where you left

The synchronized block construct in Java has some deficiencies Probably the most important for parallel programmers is the lack of a way to find out whether a lock is available before attempting to acquire it There is also no way to interrupt a thread waiting on a synchronized block, and the

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This means that applets don't make good RMI clients, unless of course the same machine is used for the rmiregistry, every service that the applet may need to use, and the Web server Digitally signed applets can lift this restriction, but this adds an extra level of complexity 111033 Firewall Restrictions

A considerable number of Web users are protected by a firewall, which usually prohibits direct socket connections Many companies, organizations, and other institutions use firewalls to protect themselves against security breaches from outside and to restrict the types of applications being run from the inside This means that some users will be able to use an applet that used RMI, and others will not Even a digitally signed applet won't get through, unless RMI requests are tunneled through the firewall using a trusted protocol such as HTTP Tunneling allows one protocol to be piggybacked on top of another more innocuous protocol, to overcome the limitations of firewalls and network security NOTE The RMI specification does support firewall tunneling using HTTP, and an example CGI script that supports this is available from the Sun Microsystems Java RMI page, http://javasuncom/products/jdk/rmi/ However, the specification states that such tunneling is at least one order of magnitude slower than direct socket requests While RMI is an excellent technology for distributed computing, it is not normally feasible for Java applets

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synchronized block construct forces the locks to be acquired and released in a nested fashion This disallows certain kinds of programming idioms in which a lock is acquired in one block and released in another As a result of these deficiencies, many programmers have created their own lock classes instead of using the built in synchronized blocks For examples, see [Lea] In response to this situation, in Java 2 15, package javautilconcurrentlocks provides several lock classes that can be used as an alternative to synchronized blocks These are discussed in the Java appendix, Appendix C

A common technique used in event-driven programming is the callback The simplest way of understanding a callback is to think of a phone call Suppose you want to know if a stock price hits a certain level, and you ask your broker to call back when it does When the broker (the source of the event) notices that the stock price reflects your parameters, he or she calls you back, to notify you of the new price That's a callback

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