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As networks grow, the need to subnet them grows, too Eventually, you ll find that you have a lot of subnets that can t all be tracked easily, especially if they are being managed by different administrators One subnet, for instance, may need to break its network in half for security reasons In a situation this complex, going around and telling everyone to update their routing tables would be a real nightmare and would lead to all sorts of network headaches The solution to this problem is to use dynamic routing The idea behind dynamic routing is that each router only knows immediately adjacent networks when it starts up It then announces to other routers connected to it what it knows, and the other routers reply back with what they know Think of it as word of mouth advertising for your network You tell the people around you about your network, they then tell their friends, and their friends tell their friends, and so on Eventually, everyone connected to the network knows about your new network On campus-wide networks (such as a large company with many departments), you ll typically see this method of announcing route information As of this writing, the two most commonly used routing protocols are RIP and Open Shortest Path First (OSPF) Routing Information Protocol (RIP) is currently up to version 2 It is a simple protocol that is easy to configure Simply tell the router information about one network (making sure each subnet in the company has a connection to a router that knows about RIP), and then have the routers connected to one another RIP broadcasts happen at regular time intervals (usually less than a minute), and in only a few minutes, the entire campus network knows about you Let s see how a smaller campus network with four subnets would work with RIP Figure 11-10 shows how the network is connected NOTE For the sake of simplicity, we re serializing the events In reality, many of these events would happen in parallel As illustrated in this figure, router 1 would be told about 19216810/24 and about the default route to the Internet Router 2 would be told about 19216820/24, router 3 would know about 19216830/24, and so on At startup, each router s table looks like this: Router Router 1 Table 1921681 Internet gateway Router 2 Router 3 Router 4 1921682 1921683 1921684.

The first three were added by Java SE 6 Although TimeUnit lets you specify any of these values in calls to methods that take a timing argument, there is no guarantee that the system is capable of the specified resolution Here is an example that uses TimeUnit The CallableDemo class, shown in the previous section, is modified as shown next to use the second form of get( ) that takes a TimeUnit argument

try { Systemoutprintln(fget(10, TimeUnitMILLISECONDS)); Systemoutprintln(f2get(10, TimeUnitMILLISECONDS)); Systemoutprintln(f3get(10, TimeUnitMILLISECONDS)); } catch (InterruptedException exc) { Systemoutprintln(exc); } catch (ExecutionException exc) { Systemoutprintln(exc); } catch (TimeoutException exc) { Systemoutprintln(exc); }

11:

Finally, you may have noticed the checkmark next to a condition. In Figure 12-16 it is next to the second condition (indicated by the numeral 2). The checkmark indicates which condition the SWITCH block considers the default value to use and the tab (and its blocks) to select if the SWITCH block is unable to make a decision. For example, suppose I had configured the RANDOM block to select a value between 1 and 5. There are no conditions specified for what to do if a 4 or 5 is randomly selected. Suppose you wish a 4 or 5 to be treated as a value of 3. In this case, the blocks found on the third tab will be executed because you have selected condition 3 by selecting the third condition and clicking on the small asterisk button (*), as seen in Figure 12-17.

In this version, no call to get( ) will wait more than 10 milliseconds The TimeUnit enumeration defines various methods that convert between units These are shown here: long convert(long tval, TimeUnit tu) long toMicros(long tval) long toMillis(long tval) long toNanos(long tval) long toSeconds(long tval) long toDays(long tval) long toHours(long tval) long toMinutes(long tval) The convert( ) method converts tval into the specified unit and returns the result The to methods perform the indicated conversion and return the result The last three methods were added by Java SE 6 TimeUnit also defines the following timing methods: void sleep(long delay) throws InterruptedExecution void timedJoin(Thread thrd, long delay) throws InterruptedExecution void timedWait(Object obj, long delay) throws InterruptedExecution Here, sleep( ) pauses execution for the specified delay period, which is specified in terms of the invoking enumeration constant It translates into a call to Threadsleep( ) The timedJoin( ) method is a specialized version of Threadjoin( ) in which thrd pauses for the time period specified by delay, which is described in terms of the invoking time unit The timedWait( ) method is a specialized version of Objectwait( ) in which obj is waited on for the period of time specified by delay, which is described in terms of the invoking time unit

Part II:

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As explained, the concurrent API defines several collection classes that have been engineered for concurrent operation They are ArrayBlockingQueue ConcurrentHashMap ConcurrentLinkedQueue ConcurrentSkipListMap (Added by Java SE 6) ConcurrentSkipListSet (Added by Java SE 6) CopyOnWriteArraylist CopyOnWriteArraySet DelayQueue LinkedBlockingDeque (Added by Java SE 6) LinkedBlockingQueue PriorityBlockingQueue SynchronousQueue These offer concurrent alternatives to their related classes defined by the Collections Framework These collections work much like the other collections except that they provide concurrency support Programmers familiar with the Collections Framework will have no trouble using these concurrent collections

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