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stateful session beans are misused. In the end, we ll have gained a better sense of how to pack our gear to ensure a safe and swift journey to our next project.
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5.1 Making a case for session state
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Before we dive headlong into choosing tools for storing session state, we need to fully understand what we re trying to achieve with these tools. Specifically, what is session state and when is it valuable Session state is simply a working set of information that spans a given conversation. In fact, it s often referred to as conversational state. We ll use both terms interchangeably throughout this chapter. We rely on conversational state anytime we engage in any meaningful conversation. As we re chatting with someone, we build up a history that gives context to our conversation. That is, the words we hear and speak have meaning insofar as they are relevant to something we ve already said. Using this conversational state as a backdrop, we can communicate much more efficiently. We don t need to qualify every statement by reiterating the sum of the conversation to date. Conversations between software clients and servers are no different. For example, if you ve purchased anything over the Internet recently, then you re probably familiar with the virtual shopping cart. When you show up at an online store to shop, you get your own personal shopping cart. You push your virtual cart around the e-commerce site, filling it with goodies from the vendor s shelves. If you happen to wander off for a moment, leaving the cart in the middle of an aisle, you ll find it right where you left it when you return. Moreover, your cart will still contain all the items you ve already added. Once you re done shopping, you wheel the cart to the checkout line and surrender your wallet. From the time you take control of the shopping cart until the checkout process is complete, you are holding a stateful conversation with the e-commerce server. As you navigate through pages of the web site and pluck merchandise from the shelves, the server at all times remembers who you are and what is in your cart. The contents of your shopping cart represent the session state a history of you and your shopping spree. Figure 5.1 depicts your private conversation with the e-commerce server. Imagine what the same conversation might be like if, every time you added something to your shopping cart, the server conveniently forgot what it already contained. The exchange would probably sound more like The Twelve Days of Christmas in which adding a new item in turn causes all prior items to be named.
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A pivotal antipattern: Conversational Baggage
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Figure 5.1 Session state is simply a working set of information relevant to any given conversation. HTTP, the communication protocol used by web applications, is stateless. When a dialogue between the web browser and the server is dependent on conversational state, the server must have a strategy to manage session state.
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In other words, you d be responsible for repeating all the conversational history each time a new piece of information was introduced. As another experiment, imagine the chaos that would ensue if the server failed to keep your conversation private. That is, suppose the server forgets which shopping cart belongs to you. As you re rummaging through the shelves with your back turned, another eager shopper fills your cart with 1970s love song albums. You re in for an unwelcome surprise at the checkout line! In summary, session state is a private workspace of information that s retained throughout a conversation. Keeping this information intact is valuable because it reduces the amount of data that must be exchanged back and forth to carry on a meaningful dialogue. Alas, there s no such thing as a free lunch, especially here. The convenience of session state comes at a price that must be carefully considered. This is the subject of our first antipattern.
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