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The rude practicality you quickly learn to accept when engaged in network programming is that more can and does go wrong more often. Hostnames stop resolving, servers go down, links become clogged, and the whole of the Internet starts to resemble a series of tubes. Fortunately, the socket classes make enthusiastic use of Ruby s exceptions mechanism, rendering it easy to recover from such issues. Try this: TCPSocket.open("www.thereisnowaythisdomainshouldexist.com", 80) Unless someone has rushed out and registered this domain to spite me, you should find your script exiting with a SocketError exception. Similarly, if you try this: TCPSocket.open("slashdot.org", 90210) you ll be alerted to a refused connection, which is an exception of class Errno::ECONNREFUSED. The set of possible exceptions raised by sockets is vast and covers every error you d expect from UNIX or Windows socket programming. I ve found that it s safest just to think of them all as plain old Exceptions (remembering that all Ruby exceptions are subclasses of this), unless I have very specific requirements to do otherwise. Imagine we have a particularly annoying web site that is so busy it refuses connections twothirds of the time. That sounds like a job for a begin-rescue-end block, as shown in Listing 8-1. Listing 8-1. A Dogged Connection Attempt attempts = 0 begin attempts += 1 TCPSocket.open("www.example.com", 80) { |socket| ... } rescue if attempts < 3 then sleep 5 and retry else puts "I've had enough of this" end end Here we catch any problems that occur in relation to the socket connection and retry from the beginning if such problems occur. Each retry carries a five-second wait before it commences. After three unsuccessful attempts, we give up completely.

Electronic Code Book (ECB)

id: The unique task ID assigned to this task instance by the jBPM runtime actorId: The ID of the actor currently assigned to this task (if any) It s a simple matter to add a JSF dataTable to the adminHome.jsp page, listing out any pooled tasks that the administrator can choose to perform:

Electronic Code Book (ECB) is the simplest mode of all available modes (see Figure 6-11). Given plain text, it divides the message into a fixed block of n size. Then each individual block is encrypted or decrypted, and finally the output produced by an individual block is combined to form cipher text or plain text.

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There comes a time in every script s life when it just has to accept the reality that it is stuck in a rut. Networking tends to increase the frequency of this occurrence. It is important therefore to recognize assumptions in your code as to how quickly a network operation will complete and how to react if this deadline has been missed. Ruby has a very useful library for this, as demonstrated in Listing 8-2.

Cipher Block Chaining (CBC)

<h:dataTable rendered="#{not empty pooledTaskInstanceList}" value="#{pooledTaskInstanceList}" var="task"> <h:column> <f:facet name="header">Description</f:facet> <h:outputText value="#{task.description}"/> </h:column> <h:column> <s:link action="#{pooledTask.assignToCurrentActor}" value="Accept" taskInstance="#{task}"/> </h:column> </h:dataTable>

In Cipher Block Chaining (CBC) mode, the plain text is divided into a fixed block of n size, but each block of plain text before being encrypted is XORed with the previous encrypted block, and encryption is performed on the output produced from this bitwise XOR operation (see Figure 6-12). There is an exception that is applied only to the first block where the XORing operation is performed with an initialization vector (IV). IV is random information generated to act as input to the first block of plain text.

Listing 8-2. Imposing an Upper Limit on the Duration of Socket Operations require "timeout" begin Timeout::timeout(5) do TCPSocket.open("www.example.com", 80) { |socket| ... } end rescue puts "something untoward happened - how bothersome" end As should be obvious, the Timeout module has but one method (timeout), which takes a block to run and a number of seconds to wait before stopping it dead. When such an interruption occurs, a Timeout::Error is raised. I mention the specific class of the error as you might wish to handle your self-imposed timeout differently from the other socket exceptions. As discussed previously and shown in Listing 8-3, this can be accomplished by matching against the exception class. Listing 8-3. Rescuing Conditionally Based on Exception Class begin # socket code with timeout rescue Timeout::Error # rescue code for our timeout rescue # all other rescue code end Timeout::timeout takes an optional second argument that allows you to override the class of the exception to be raised upon timing out. This should give you enough flexibility to apply the Timeout module to a huge variety of situations. For more in-depth information on exactly how this module works, take a look at the sidebar Time Gentlemen Please.

Cipher Feedback Mode (CFM)

The only new details we ve introduced here are the use of the pooledTask component and the use of the taskInstance attribute on the Seam s:link control. The pooledTask component is another built-in Seam component that is enabled when you enable jBPM support in your application. This component is used to assign tasks to users. When you invoke the assignToCurrentActor action method, it assigns the task to the current actor. The actor ID is accessed from the currently active actor component. The task is referenced on the link using its task ID. In this case, we re using the taskInstance attribute on s:link, which is a shortcut to adding the task ID to the request. If you were using a regular JSF commandLink control instead, you would have to pass in a taskId parameter using the id property of the task:

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