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Given all of that information and the example above, we should officially discuss how to declare a variable in the Python language. Let s take a look at some examples of defining variables in the following lines of code. Listing 2-1. Defining Variables in Jython # Defining a String x = 'Hello World' x = "Hello World Two" # Defining an integer y = 10 # Float z = 8.75 # Complex i = 1 + 8.07j An important point to note is that there really are no types in Jython. Every object is an instance of a class. In order to find the type of an object, simply use the type() function. Listing 2-2. # Return the type of an object using the type function >>> i = 1 + 8.07j >>> type(i) <type 'complex'>

4. Double-click the form and add an Imports statement to Form1.cs for the System.Data.SqlClient namespace. 5. Insert the code in Listing 9-1 into the Form1_Load method.

Listing 14-39. Enabling JNDI in Settings.py DATABASE_ENGINE = 'doj.backends.zxjdbc.postgresql' DATABASE_NAME = 'demodb' DATABASE_USER = 'ngvictor' DATABASE_PASSWORD = 'nosecrets' DATABASE_OPTIONS = {'RAW_CONNECTION_FALLBACK': True, \ 'JNDI_NAME': 'jdbc/pgpool-demo' } Note that we re duplicating the configuration to connect to the database. This is because we want to be able to fall back to regular connection binding in the event that JNDI lookups fail. This makes our life easier when we re running in a testing or development environment. That s it, you re finished configuring database connection pooling. That wasn t that bad now, was it

Listing 9-1. Simple Binding: Form1_Load()

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public class RmiExample { public static void main(String... args) { // Get the local configured context final ApplicationContext ctx = new ClassPathXmlApplicationContext("timesheet-client.xml"); // Retrieve a bean (the proxy to the remote service) final UserAccountService service = (UserAccountService)ctx.getBean("userAccountService"); // Extract data from the bean (via the remote service) final List<UserAccount> users = service.listUsers(); System.out.println("User List"); System.out.println("========="); for( final UserAccount user : users ) { System.out.println(user.getAccountName()); } } }

When you re building a complex web application, you will inevitably end up having to deal with processes that need to be processed in the background. If you re building on top of CPython and Apache, you re out of luck here there s no standard infrastructure available for you to handle these tasks. Luckily these services have had years of engineering work already done for you in the Java world. We ll take a look at two different strategies for dealing with long running tasks.

Dim connString As String = _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind"

Dim sql As String = _ "select " _ & " * " _ & "from " _ & "employees" Dim conn As SqlConnection = New SqlConnection(connString) Dim da As SqlDataAdapter = New SqlDataAdapter(sql, conn) Dim ds As DataSet = New DataSet() da.Fill(ds, "employees") ' Bind to FirstName column of the Employees table TextBox1.DataBindings.Add("text", ds, "employees.firstname") ' Bind to LastName column of the Employees table TextBox2.DataBindings.Add("text", ds, "employees.lastname")

The first strategy is to leverage managed thread pools in the JavaEE container. When your web application is running within Glassfish, each HTTP request is processed by the HTTP Service, which contains a threadpool. You can change the number of threads to affect the performance of the webserver. Glassfish will also let you create your own threadpools to execute arbitrary work units for you. The basic API for threadpools is simple: WorkManager, which provides an abstracted interface to the thread pool. Work is an interface, which encapsulates your unit of work. WorkListener, which is an interface that lets you monitor the progress of your Work tasks.

This uses a single context configuration file named timesheet-client.xml that configures the single bean of Listing 9-4. This implementation uses the RMI service to obtain a list of the UserAccount objects known to the remote system (the process of serializing a Hibernate entity will force the loading of any lazily loaded properties) and then iterates over the list displaying the usernames of the accounts.

6. Run the code with Ctrl+F5 and you should see the result in Figure 9-2.

First, we need to tell Glassfish to provision a threadpool for our use. In the Administration screen, go down to Configuration/Thread Pools. Click on New to create a new thread pool. Give your threadpool the name backend-workers. Leave all the other settings as the default values and click OK. You ve now got a thread pool that you can use. The threadpool exposes an interface where you can submit jobs to the pool and the pool will either execute the job synchronously within a thread, or you can schedule the job to run asynchronously. As long as your unit of work implements the javax.resource.spi.work.Work interface, the threadpool will happily run your code. A WorkUnit class may be as simple as Listing 14-40. Listing 14-40. Implementing a WorkUnit Class from javax.resource.spi.work import Work

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