Web server certificate - Conversations with Hibernate 11.2 Conversations with Hibernate You ve
Conversations with Hibernate 11.2 Conversations with Hibernate You ve been introduced to the concept of conversations several times throughout the previous chapters. The first time, we said that conversations are units of work that span user think-time. We then explored the basic building blocks you have to put together to create conversational applications: detached objects, reattachment, merging, and the alternative strategy with an extended persistence context. It s now time to see all these options in action. We build on the previous example, the closing and completion of an auction, and turn it into a conversation. 11.2.1 Providing conversational guarantees You already implemented a conversation it just wasn t long. You implemented the shortest possible conversation: a conversation that spanned a single request from the application user: The user (let s assume we re talking about a human operator) clicks the Complete Auction button in the CaveatEmptor administration interface. This requested event is then processed, and a response showing that the action was successful is presented to the operator. In practice, short conversations are common. Almost all applications have more complex conversations more sophisticated sequences of actions that have to be grouped together as one unit. For example, the human operator who clicks the Complete Auction button does so because they re convinced this auction should be completed. They make this decision by looking at the data presented on the screen how did the information get there? An earlier request was sent to the application and triggered the loading of an auction for display. From the application user s point of view, this loading of data is part of the same unit of work. It seems reasonable that the application also should know that both events the loading of an auction item for display and the completion of an auction are supposed to be in the same unit of work. We re expanding our concept of a unit of work and adopting the point of view of the application user. You group both events into the same conversation. The application user expects some guarantees while going through this conversation with the application: The auction the user is about to close and end isn t modified while they look at it. Completion of the auction requires that the data on which this decision is based is still unchanged when the completion occurs. Otherwise, the operator is working with stale data and probably will make a wrong decision.
We recommend cheap and reliable webhost to host and run your web applications: Coldfusion Web Hosting services.