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At the lowest level, computers are entirely number-based, with everything represented by streams of numbers. A language such as Ruby tries to insulate you from the internal workings of the computer, and numbers in Ruby are used for mostly the same things that you use numbers for in real life, such as counting, logical comparisons, arithmetic, and so on. Let s look at how you can use numbers in these ways in Ruby and how to do something with them.

Figure 6.3 A single page of the web photo album, showing a full-size picture, plus an optional description of the picture.

The DiffGram format of the WriteXml method can provide a stateful representation of the DataSet contents, as opposed to the stateless nature of the normal form Because of its ability to preserve the state of the constituent rows, the DiffGram format is also used to remote a DataSet object through both the Microsoft NET Framework remoting architecture and Web services But let's start by taking a closer look at the structure of a DiffGram script..

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Contrary to our initial hypothesis, remote calls did not degrade the performance (not those between the JSPs and entity beans anyway) The vendor had not started separating the web and EJB containers into different class loaders or virtual machines The culprit here was transactions The EJB specification requires containers to always invoke ejbLoad() on entity beans at the beginning of transactions and ejbStore() at the end of transactions This requirement ensures that the database and container s views of the data state are synchronized In the application s current design, the JSP invoked the entity bean accessors and mutators directly The transaction attribute for these entity bean methods was set to Required This transaction attribute is defined as follows: If a client invokes a method in the context of a running transaction, the EJB method inherits that transaction.

C# protected override void ConfigureContainer() { base.ConfigureContainer(); this.RegisterTypeIfMissing(typeof(IModuleTracker), typeof(ModuleTracker), true); this.Container.RegisterInstance<CallbackLogger>(this.callbackLogger); }

If the client is not running a transaction, the container starts and commits a new transaction for the duration of the method invocation This means that, for each call on a getter method, the container started a new transaction, loaded the data for that field from the database, and committed the transaction For each call to a setter, the container at a minimum started a new transaction, updated the field in the database, and committed the transaction It got worse Additionally, the database transaction s atomicity had field granularity Because rows were modified one field at a time, independent requests could query or update the same row concurrently, resulting in collisions and poor performance Why the sudden performance degradation Between the old and new versions of the application server, the vendor modified the default caching strategy.

When working with strings at an advanced level, it becomes necessary to learn about regular expressions. A regular expression is, essentially, a search query, and not to be confused with the expressions we ve discussed already in this chapter. If you type ruby into your favorite search engine, you d expect information about Ruby to appear. Likewise, if your regular expression is ruby and you run that query against, say, a long string, you d expect any matches to be returned. A regular expression, therefore, is a string that describes a pattern for matching elements in other strings.

In the old version, the vendor configured the server to have exclusive access to the database by default The container knew it was the only application capable of modifying the database In effect, there were no cluster and no external applications that wrote to the database What this means is that the container could perform caching that would not otherwise be possible The container did not have to make a trip back to the database (by calling ejbLoad()) if the application did not modify the data Additionally, the container could batch updates, resulting in fewer calls In the new version, the vendor s default changed to what it called database synchronization, undoubtedly to make cluster setups smoother The new strategy relied on the underlying data store to handle concurrent access to data, the side effect being that the container called ejbLoad() and ejbStore() for each and every transaction..

The resulting PDF is shown on the right in figure 2.13. The method setStrictImageSequence() allows you to force iText to respect the order in which content is added.

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