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rolls back, the former transaction is actually using the wrong data An unrepeatable read takes place if a transaction reads data from the database, and then at a later time, it reads the same data but that data already has changed This could happen due to the actions of another transaction A phantom read occurs when a transaction queries the database and retrieves a certain data set, another transaction updates the database, and at a later time the former transactions performs the same query and gets new records (the new records are phantom records) The more "relaxed" isolation level for EJB is the TRANSACTION_READ_UNCOMMITTED; this level imposes no isolation guarantees, but it provides the best performance Using this isolation level makes your system susceptible to all three types of problems (dirty reads, unrepeatable reads, and phantom reads) The TRANSACTION_READ_COMMITTED level solves the dirty read problem and guarantees that it does not occur The TRANSACTION_REPEATABLE_READ prevents both the dirty read problem as well as the unrepeatable read problems The TRANSACTION_SERIALIZABLE level provides the best guarantees, and specifically none of the dirty read, unrepeatable read, and the phantom read problems can occur in this level Since isolation is related to database access, it applies differently to beans with CMP For session beans or entity beans with Bean-Managed Persistence (BMP), the container sets the transaction isolation level for each database connection used by the bean at the beginning of a transaction For beans with CMP, the persisted object implements the database access code in a manner that conforms to the specific isolation level Your selection of which isolation level to use depends first and foremost on the isolation levels supports by the underlying database Otherwise, there is a clear tradeoff between performance and risk to data consistency This tradeoff results from the simple fact that the longer a lock on a certain data record is kept, risks to data consistency are lower but overall performance degrades (because concurrent transactions are kept waiting) In extreme cases, deadlocks could result The Serializable isolation level is the most restrictive and the safest, but in some cases is not required For example, code that never performs updates but only reads could use the ReadUncommited level The issue of which levels are supported by the underlying database is not theoretical, as not all levels of isolations are supported by all databases For example, Oracle (a prominent player in the database market) supports only the ReadCommitted and Serializable levels This means that you must choose the lesser of two evils: run a risk of phantom reads and unrepeatable read anomalies or end up with poor performance Controlling EJB Transactions with the AAT The WebSphere Application Assembly Tool (AAT) provides a convenient way for setting the transactional behavior of EJB On the General tab for a session bean, you can set the transactional behavior either as bean managed or container managed, as shown in Figure 31-1 Development tools such as the WebSphere Studio Application Developer (WSAD), described in 16, also allow you to set the EJB's transaction behavior This selection is not needed for entity beans, because the container manages transactions for such beans.

Here s how to define a parameter: 1 From the Insert menu, select Parameter The Define The Parameter screen displays 2 In the Parameter Name text box, type a name for the parameter 3 Click OK The parameter displays on the Parameters tab in the Insertable Objects pane, as shown next:

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contractor and the owner Such documentation may include the following: Invitation to bid (instruction to bidders): A section which describes the nature of the project, establishes the time and place for submitting bids, and expresses any other quali cation or action required of potential bidders Bid forms: A formal document for the contractor to ll out to propose a price for completing the work described by the contract documents The proposal may call for a lump-sum price or may be written on a unit-price, hourly cost (time and materials), or cost-plus-fee basis Sometimes there is a base bid with additive or deductive alternates The alternates give the owner a chance to adjust the cost of the project to meet available funding Bonds: Insurance policies Since contractors sometimes fail to complete the work as contracted, some projects require a payment bond which guarantees to the owner that the contract will be completed, even by a third party if necessary General conditions: Often a lengthy document spelling out in great detail the behaviors required of the owner and the contractor in the conduct of the work Standard industry forms of this document are often used [see the American Institute of Architects (AIA) form A201 or Engineering Joint Documents Council (EJDC) form 1910-8] The general conditions may be modi ed with job speci c supplemental general conditions In preparing elements of the contractual papers or boilerplate, it is helpful to use standard document forms which have a common origin and have been checked for legal consistency between the different forms Such are available from the AIA and EJDC Other entities such as federal and state institutions as well as corporations may have their own forms and formats In this litigious US society, it is imperative that these documents be clear and consistent

Figure 31-1: Setting the transaction behavior using the AAT When using container-managed transactions, the transaction attribute is set through the Container Transaction entry of the EJB module To define the transaction attribute for one or more methods, you can right-click this entry and choose New This dialog box opens

A calculation uses multiple data items to derive a single value Here s how to define a calculation: 1 From the Insert menu, select Calculation The Define The Data Item screen displays 2 In the Name text box, type a name for the calculation For this example, we name the calculation Gross Profit % 3 In the Expression text box, define the calculation by dragging items and/or functions from the Insertable Objects pane or by typing directly in the Expression text box For this example, we define the expression for the calculation as Gross Profit divided by Revenue, as shown next:

Following the information which describes the legal characteristics of the contract between the contractor (vendor and installer), the technical speci cations describe in more or less detail which materials are to be used and how they are to be installed The drawings, usually at reduced scale, indicate the form of the installation Drawings and

Clicking the Add button opens a new window where you can select an EJB method from any of the beans in the module for which container-managed transactions are used

TIP When typing directly in the Expression text box, you must include the full path of each data item

4 Click OK The calculation displays in the Data Items tab You can include the calculation when specifying an event condition or task For this example, we add the Gross Profit % calculation to the event condition, as shown next:

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You can select as many methods as you want and select the transaction attribute desired for these methods, as shown here:

14:

Design Documentation: Drawings and Specifications Design Documentation: Drawings and Speci cations 419

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