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After the response comes back, the original request re-enters the ACTIVE state Note that the server app cannot place an Invocation into the ERROR state; this state is reserved for use by the AMS However, you can easily imagine many reasons why a request might fail to complete: bad arguments from the client, a network error, running out of filesystem space How, then, does the server communicate the error back to the client The simplest way is for the server app to exit without providing a response; this sends the ERROR state back to the client, but provides no additional information about the cause of the error A better way is to set the state to OK, but provide additional data that the client can read to determine whether the request succeeded or failed In this sense, "OK" means I m done rather than Everything went fine.

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If your Open Directory Master were named seldon.company.com, then you could use the following code to check availability, by DNS name of the LDAP service on the server:

Figure 8-4 shows the complete Invocation life cycle within the server app..

When figuring out how to implement test-driven development techniques, remember the following points: An Ajax application contains four main test layers: client side, server side, contract, and Mock URL. The contract and Mock URL tests are developed simultaneously using agile development techniques, and they implement application use cases. You can use the contract and Mock URL tests for REST, SOAP and other protocols. , The client- and server-side tests are specific to the client or server and are used to implement test-driven development. The client side should not be dependent on the implementation details of the server, and the server should not be dependent on the implementation details of the client.

Because the name seldom.company.com has to resolve, you re actually able to check whether a DNS error occurs and whether you can communicate over port 389 to the host in one command. If you plan to use stroke a lot, you may want to create a symlink to the binary in a directory that is specified in your environment s PATH, you can then use it without needing to change your working directory:

NOTE: If you can scan port 389 (or port 636, if you are using SSL) from the server using localhost (127.0.0.1) then it typically stands to reason that if you cannot access port 389 on the server from a client via IP or DNS that you likely have a network problem that is preventing connectivity---even if the server requires authentication to enumerate the directory tree it should still listen over the LDAP port for said authentication. The second way to check that LDAP is available to your client systems is to telnet into port 389 of the host running the LDAP service. There are a number of services that can be tested in this manner, including most web servers and SMTP. For each service you would simply follow telnet by the name (or IP address) of the host you are testing and then the port, as follows:

In the same way that the client could set arguments or data in its request, the server can do the same. When it first receives the Invocation, it will see the arguments and data that were included in the request. It can set its own arguments and data using the same methods. After the request is finished, those values are copied back over to the client app, which can pull them out for examination. Of course, any changes made to arguments or data after a request is invoked or finished will not be updated in the other app. There are no standards in place for formatting arguments and data. If you are writing a content handling app for other developers, you should clearly document any return parameters. If you are writing a client app, inspect the documentation to make sure you are handling all possible return values; if no documentation is available, print out the responses you get back so you can see what they are, and update your code to handle them appropriately. You might see extended status information, such as "Status:ERROR file not found"; returned content, such as "file:///SDCard/BlackBerry/tmp/output. amr"; or tracking data, such as "RequestID=7238497".

At this point, you should receive a response similar to the following, which by virtue of the Connected line shows that you were indeed able to communicate with port 389:

Coding the contract using agile and test-driven development techniques requires writing a number of tests and implementing a Mock URL layer.