java qr code generator library The worker object creation pattern in Java

Generating QRCode in Java The worker object creation pattern

3.2 Some small refactoring case studies
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<persistence-context-ref> <persistence-context-ref-name> actionBazaar/EntityManager </persistence-context-ref-name> <persistence-unit-name>actionBazaar</persistence-unit-name> </persistence-context-ref>
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@WebMethod(operationName = "CheckStatus") public int checkStatus( @WebParam(name = "ReservationID") String reservationId, @WebParam(name = "CustomerID", mode = WebParam.Mode.OUT)<Integer> customerId ){ ... // return customer id and status customerId.value = getCustomerId(reservationId);
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//home method public int getCountOfSymbols() throws RemoteException; }
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int resultSize = query.getResultSize();
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Listing 4.6 Example bridge servlet implementation
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use GD::Graph::bars; my @data = ( ['frogs','fish','toads','rodents'], [ 8, 3, 1, 2], ); my $chart = GD::Graph::bars->new(700,500); $chart->set(title => 'Ostrich diet'); $chart->set_title_font('arialbd', 24); $chart->set_x_axis_font('arial', 16); $chart->set_y_axis_font('arial', 16); my $gd_object = $chart->plot(\@data);
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Because the implementation of business rules is spread over as many modules as the core business logic, the core business logic is tangled with business rules, resulting in a hard-to-follow implementation. In addition, the same rules need to be embedded at many points typically at all state-change points in the business class, causing duplication of code. Implementations of complex business rules often employ a set of modules called a rule engine for business rule evaluation that is separate from the core logic. In these cases, however, even if the implementation of the rule evaluation is separated, the core business logic must call the rule engine API from each module that may need the rules. Whether you are using simple or complex rules, the fundamental problem is the same: the business rule implementation is scattered all over the core business modules. Since such scattering is a classic symptom of a crosscutting concern, you can employ AspectJ to modularize the concern.
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The Similarity class is an abstract class that defines the methods necessary for a subclass to override whether the user wishes to modify the way Lucene scores documents. Similarity has two subclasses: DefaultSimilarity and SimilarityDelegator. For this discussion we are interested only in DefaultSimilarity. As it name suggests, the DefaultSimilarity class is in effect if the user does nothing to modify the scoring calculation and lets Lucene work. Before we cover how to utilize this class, a discussion of Lucene s scoring methodology is in order. Lucene utilizes the formula in equation 12.28 for scoring document d against a particular query q.
interface IClockIn { void ClockIn(object item); }
The subroutine takes as its arguments the number of objects to render, and the scale and angle at which to render them. We return immediately if the number of requested objects is smaller than or equal to zero. We push the current state of the attributes onto the attribute stack with AttributeBegin(). All the changes we make to attributes, such as the coordinate system, are local until the corresponding call to AttributeEnd(). After we have saved the current state, we change it by modifying the translation and scaling. We then set up three nested loops; one for each side of the large cube we re drawing. Inside the innermost loop we set the color of the object we re going to draw, based on the coordinates of the object we re drawing. This means that the color over the cube as a whole will gradually change between objects. We save the state of the current transformation matrix with TransformBegin(), and change the coordinate system to draw a single small object, which can be made up of a cube, a sphere, or a combination of both, depending on the variables $cubes and $spheres. We draw the cube and the sphere with Sphere(), which is a function provided by the RenderMan library, and cube(), a function we provide ourselves. Once that is accomplished, we restore the transformation matrix to the value it had before we drew this small object. All that is left for us to do now is to provide the code that actually draws a solid cube, or rectangle.
Tests to see if previous() will return a value
Once in a while, I found it necessary to modify the structure of a database to such an extent that older versions of an application either crashed, or would cause major data headaches. To prevent this, I added a database version setting, DatabaseVersion, and use this code block to test against it. If the program doesn t match the expected database version, it will refuse to run. Now that we have some basic database access tools, we re ready to start adding some real data interaction code to the Library application.
Using a PdfVisibilityExpression offers a more general way to define a layer membership. Possible values for the parameter when constructing a PdfVisibilityExpression are AND, OR, and NOT. You can add PdfLayer objects to a visibility expression, and you can nest PdfVisibilityExpression objects. If the value is NOT, you may only add one element. If it s AND or OR, you can add more elements. Another way to switch content on or off is by using actions.
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