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developers could jump to the result set s beginning or end, to an absolute position within the result set, or even to a position relative to the current position With this new tool in our belts, our first thought was how incredibly instrumental this new API could be in implementing patterns such as the Page-by-Page Iterator For example, an active ResultSet could back an iterator instance, pulling records randomly and constructing the corresponding data transfer objects on demand Our euphoria was short-lived, however An open database connection backs the open ResultSet So, monopolizing a database connection for the duration of a user s session simply does not scale For example, consider a web application that keeps a pool of 20 database connections You implement your Page-by-Page Iterator using a stateful session bean (or a plain Java object stored in the HTTP session) with a ResultSet instance field.

This effectively signs the web part with a unique key, thus preventing another web part from impersonating yours.

The stateful session bean executes the query upon creation and holds onto the ResultSet Effectively, the bean retains a cursor containing the database s query results, along with the corresponding connection Each time the user moves to a different web page, you hit the stateful session bean, which in turn uses the JDBC 20 ResultSet to scroll to the desired location and returns the requested records To implement this procedure properly, you must address a few difficulties The first problem is how to maintain the stateful session bean and result set for the user session duration You could limit the user to one instance at a time, but if you do, you also prevent the user from opening multiple browser windows and running and paging multiple queries concurrently not a good practice.

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Android doesn t come with a fantastic voicemail app built in. That s because voicemail depends a lot on your carrier and its system. There are some settings on your contact page to let you dial into your carrier s voicemail system, but it s still not visual voicemail.

Maintaining the bean instance for the user session duration means you must hold onto the bean instance until the user explicitly logs out (which, in the best of circumstances, users won t always do) or until the user s session expires Session timeouts typically run somewhere between 20 minutes and an hour Let s say you have 20 database connections in your pool If you dedicate a database connection to each user, your application can only handle 20 unique users over a given 20-minute period, or more if the session timeout is longer Keep in mind that 20 minutes is the best case scenario, because an active user will not time out at first Compounding the problem, a user will often accidentally or intentionally close their browser, then reopen it and relog in.

By default, when a new web part project is created, the web part is named Webpart1, which is not a very descriptive name! To give the web part a more useful name we need to edit the Webpart1.dwp file to set the name and title properties. Following is the Webpart1.dwp file showing the edits made for the Base web part: < xml version="1.0" encoding="utf-8" > <WebPart xmlns="http://schemas.microsoft.com/WebPart/v2" > <Title>Base</Title> <Description>Base webpart</Description> <Assembly>MG.WebParts.Base</Assembly> <TypeName>MG.WebParts.Base.WebPart1</TypeName> </WebPart> Now that you have an understanding of what the Base web part does and how to build it, we ll walk through the steps to deploy it to the SharePoint server.

You can t definitively differentiate this situation from one in which two people are logged into the same account from different computers Therefore, in this case, the user effectively counts as two unique users and monopolizes two database connections As you can see, it doesn t take many concurrent users under this model to drag the system to its knees..

Rather than navigating the voice options by listening and pressing buttons, visual voicemail gives you the option of viewing voicemail messages like you would your calling history. You can browse through your messages and then listen once you ve found a message of interest. Your phone carrier may offer a free visual voicemail app, or you can use Google Voice as your visual voicemail solution. Usually, visual voicemail apps come preinstalled, but if you purchase a Nexus One, check with your carrier. I ll discuss Google Voice in more detail in a bit.

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