merge multiple pdf files into one using java

merge multiple pdf files into one using java

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You have been tasked with upgrading the software that keeps track of donations at the Baldwin Museum of Science. Upon initial inspection, you see that each record is displayed on a separate form so that you must navigate sequentially to go from one museum record to the next. In addition to the many forms, the application has a sep arate component that is specifically for keeping the database and the forms in synch. List the potential improvements you can make to the application.

Figure 2-2 shows the package properties, highlighting the checkpoint properties set in steps 1 through 4.

fetched at once) and which page was previously fetched. onSuccess and onFailure are function types, permitting us to run code on the success or failure of our web service request.

You just landed a developer s dream job at City Power and Light. Your next big project is writing the next-generation software that runs the power grid for the entire city! You know you are going to be working on this application for quite some time before it ever goes live, so the main database won t be available until the application is actu ally deployed. You will to need to design this application to easily switch between the test and production databases. What would you do to facilitate this architecture

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After you enable checkpoints in a package, the final step is to set checkpoints at the various tasks within your package. To do this, set the FailPackageOnFailure property at each task or container to True.

In the previous example, the Truncate Update Table, Data Flow, and Batch Updates Tasks have the FailPackageOnFailure property set to True.

To gain further knowledge on the subject of working with data in a connected envi ronment, complete the following practices.

In the init block we test for apiKey initialization; if it s unset we print an error message. A professional application would do something more useful with the error, of course, but for our project a simple error report like this will suffice (it keeps the class free of too much off-topic detail). We conclude the code with listing 8.3.

figure 2-2 Setting checkpoint properties for a package requires modifying the package-level properties CheckpointFileName, CheckpointUsage, and SaveCheckpoints.

Create an application that displays data from the Categories and Products tables using the Data Sources window.

After you have performed steps 1 through 5 to set up checkpoints for your package, including the control flow objects, your packages are set up to restart in case of failure. Here is what happens when you run a package that has checkpoints enabled:

Listing 8.3 FlickrService.fx (part 3)

If the checkpoint file does not exist, the package begins at the first task (or parallel tasks) in the control flow. If the checkpoint file does exist, the package reads the file to find out where to start (including updating the value of variables and connections at the time of the last failure).

Create an application that displays data from the Customers table in a DataGridView and then displays that customer s orders in the same DataGridView when a button is clicked. Create an application that displays the data from the Products table and format the cells that contain discontinued products with grayed-out text.

At each successful checkpoint in the package (when the Data Flow Task has FailPackageOnFailure set to True and the task is successful), the checkpoint file is updated.

// ** Part 1 is listing 8.1; part 2 is listing 8.2 public function loadPage(p:Integer) : Void { if(not valid) throw new Exception("API key not set."); page = p; var args = [ "method", "api_key", "user_id", "per_page", "page", ]; "flickr.people.getPublicPhotos", apiKey, userId, photosPerPage.toString(), page.toString()

The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-526 certification exam content. You can set up the test so that it closely sim ulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.

3. 4.

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