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Modulo operations can be done by bit operators, when the modulo argument is a power of two Instead of calculating int round = i % 8; you can use the faster bit operation int round = i & 7; Using switch Statements Instead of using several if blocks, you can use the switch statement When you use a contiguous value range, the switch statement uses a constant processing time regardless of which case does match So it might be even worth it to add dummy cases to create a contiguous test range Listing 16-7 demonstrates a slow and a fast usage of the switch statement Listing 16-7 Accelerating the switch Statement public char slowSwitch( int switch ( keyEvent ) { case CanvasKEY_NUM6: case CanvasKEY_NUM3: case CanvasKEY_NUM8: case CanvasKEY_NUM9: case CanvasKEY_NUM2: case CanvasKEY_NUM1: case Canvas.

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The dot operator (.) signifies path navigation in an expression. For example, if the Employee entity has been mapped to the identification variable e, e.name is a state field path expression resolving to the employee name. Likewise, the path expression e.department is a single-valued association from the employee to the department to which he or she is assigned. Finally, e.directs is a collection-valued association that resolves to the collection of employees reporting to an employee who is also a manager. What makes path expressions so powerful is that they are not limited to a single navigation. Instead, navigation expressions can be chained together to traverse complex entity graphs as long as the path moves from left to right across single-valued associations. A path cannot continue from a state field or collection-valued association. Using this technique, we can construct path expressions such as e.department.name, which is the name of the department to which the employee belongs. Note that path expressions can navigate into and across embedded objects as well as normal entities. The only restriction on embedded objects in a path expression is that the root of the path expression must begin with an entity. Path expressions are used in every clause of a select query, determining everything from the result type of the query to the conditions under which the results should be filtered. Experience with path expressions is the key to writing effective queries.

KEY_NUM5: } } public char fastSwitch( int switch ( keyEvent ) { case CanvasKEY_NUM1: case CanvasKEY_NUM2: case CanvasKEY_NUM3: case CanvasKEY_NUM4: case CanvasKEY_NUM5: case CanvasKEY_NUM6: case CanvasKEY_NUM7: keyEvent ) { return return return return return return return '6'; '3'; '8'; '9'; '2'; '1'; '5';.

To be able to manually begin and commit container transactions, the application must have an interface that supports it. The UserTransaction interface is the designated object in the JTA that applications can hold on to and invoke to manage transaction boundaries. An instance of UserTransaction is not actually the current transaction instance; it is a sort of proxy that provides the transaction API and represents the current transaction. A UserTransaction instance can be injected into BMT components by using the @Resource annotation. When using dependency lookup, it is found in the environment naming context using the reserved name java:comp/UserTransaction . The UserTransaction interface is shown in Listing 3-22. Listing 3-22. The UserTransaction Interface public interface javax.transaction.UserTransaction { public abstract void begin(); public abstract void commit(); public abstract int getStatus(); public abstract void rollback(); public abstract void setRollbackOnly(); public abstract void setTransactionTimeout(int seconds); } Each JTA transaction is associated with an execution thread, so it follows that no more than one transaction can be active at any given time. So if one transaction is active, the user cannot start another one in the same thread until the first one has committed or rolled back. Alternatively, the transaction can time out, causing the transaction to roll back. We discussed earlier that in certain CMT conditions the container will suspend the current transaction. From the previous API, you can see that there is no UserTransaction method for suspending a transaction. Only the container can do this using an internal transaction management

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