pdf to image using javascript

jquery convert pdf to image

pdf annotation html5, addimage jspdf, pdf to text javascript library, pdf to excel javascript, javascript convert pdf to image, convert pdf to jpg using jquery, javascript convert pdf to tiff, javascript code to convert pdf to word, javascript create pdf library, convert excel to pdf using javascript, convert html image to pdf using javascript, jspdf jpg to pdf, html5 pdf editor, how to merge two pdf files using javascript, jquery pdf preview plugin, jspdf add html page split, pdf thumbnail javascript, add watermark to pdf using javascript, jspdf page break, print pdf javascript, javascript pdf extract image, extract text from pdf file using javascript, jspdf remove table border

An important point to note from the stateless session bean lifecycle is that since beans are allocated from and returned to the pool on a per-invocation basis, stateless session beans are extremely performance friendly and a relatively small number of bean instances can handle a large number of virtually concurrent clients. As you know, there are two types of stateless session bean lifecycle callback methods: (1) callbacks that are invoked when the PostConstruct event occurs immediately after a bean instance is created and set up, and all the resources are injected; and (2) callbacks that are invoked when the PreDestroy event occurs, right before the bean instance is retired and removed from the pool. Note that you can have multiple PostConstruct and PreDestroy callbacks for a given bean (although this is seldom used) in a class or in a separate interceptor class (discussed in chapter 5). In listing 3.1, the lifecycle callback methods embedded in the bean are initialize and cleanup. Callbacks must follow the pattern of void <METHOD>(). Unlike business methods, callbacks cannot throw checked exceptions (any exception that doesn t have java.lang.RuntimeException as a parent). Typically, these callbacks are used for allocating and releasing injected resources that are used by the business methods, which is exactly what we do in our example of BidManagerBean in listing 3.1. In listing 3.1 we open and close connections to the database using an injected JDBC data source. Recall that the addBid method in listing 3.1 inserted the new bid submitted by the user. The method created a java.sql.Statement from an open JDBC connection and used the statement to insert a record into the BIDS table. The JDBC connection object used to create the statement is a classic heavy-duty resource. It is

1

The Header and Footer categories allow you to place text and/or fields in the header or footer of the display, that is, above or below the view on a page, block, or feed. Click the plus icon to view the list of available fields. The Empty te x t section allows you to customize the content displayed on a view that returns no results. This is similar to the Header and Footer, except that the Header and Footer appear whether a view has results or not. The Fields category allows you to select fields to output in each row of your results; see Figure 7-14 for a partial list of all the fields available to choose from after clicking the plus icon. There is a large list of fields! The fields you select will depend on what you want the view to display and how you ve configured the site. For example, if you are creating a slideshow, you will most likely select the node title and an image field as the fields to output. This means you have two fields in the category; use the arrow icon to adjust the order in which the fields are output. After you add your fields, you will next create the logic behind which fields are presented.

expensive to open and should be shared across calls whenever possible. It can hold a number of native resources, so it is important to close the JDBC connection when it is no longer needed. We accomplish both these goals using callbacks as well as resource injection. In listing 3.1, the JDBC data source from which the connection is created is injected using the @Resource annotation. We explore injecting resources using the @Resource annotation in chapter 5; for now, this is all that you need to know. Let s take a closer look at how we used the callbacks in listing 3.1. PostConstruct callback The setDataSource method saves the injected data source in an instance variable. After injecting all resources, the container checks whether there are any designated PostConstruct methods that need to be invoked before the bean instance is put into the pool. In our case, we mark the initialize method in listing 3.1 with the @PostConstruct annotation:

What this chapter covers:

@PostConstruct public void initialize() { ... connection = dataSource.getConnection(); ... }

In the initialize method, we create a java.sql.Connection from the injected data source and save it into the connection instance variable used in addBid each time the client invokes the method. PreDestroy callback At some point the container decides that our bean should be removed from the pool and destroyed (perhaps at server shutdown). The PreDestroy callback gives us a chance to cleanly tear down bean resources before this is done. In the cleanup method marked with the @PreDestroy annotation in listing 3.1, we tear down the open database connection resource before the container retires our bean:

Figure 7-14. The Fields category allows you to select fields to output in each row of your results.

Downloading and installing the tools that allow you to develop Silverlight applications Creating your first Silverlight application Installing Blend 4

@PreDestroy public void cleanup() { ... connection.close(); connection = null; ... }

Since bean instances from the pool are assigned randomly for each method invocation, trying to store client-specific state across method invocations is useless