print barcode in asp.net c# Performance in Java

Drawer Quick Response Code in Java Performance

Performance
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is a DOM node of type DIV. The DOM node retains a reference to the backing object in a variable called backingObj. A Container class is also defined that houses ClickBox objects and maintains an array of them, as well as a unique ID of its own:
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function Container(id){ this.id=id; this.body=document.getElementById(id); this.boxes=new Array(); } Container.prototype.add=function(box){ this.boxes[this.boxes.length]=box; this.body.appendChild(box.body); } Container.prototype.clear=function(){ for(var i=0;i<this.boxes.length;i++){ this.boxes[i].hide(); } this.boxes=new Array(); report("clear"); newDOMs=0; reusedDOMs=0; }
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A screenshot of the application is shown in figure 8.10.
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Figure 8.10 Our memory management demo application, after creation of the first 100 widgets. The user has just clicked one of the widgets with the mouse.
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Designing for performance
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The debug panel on the right reports on the internal state of the system after various user events, such as adding or removing widgets from the container. The code has been written to allow us to swap in different patterns for creation and destruction of DOM elements and cyclic references while the application is running. The user may choose between these at runtime by checking and unchecking HTML form elements on the page. When the links that add or remove boxes from the container are activated, the combination of patterns that is used to implement the user interface will match the state of the checkboxes. Let s examine each of these options and the corresponding code. Reuse DOM Nodes checkbox Checking this option will determine whether the ClickBox widget will try to find an existing DOM node when creating itself and create a new one only as a last resort. This allows the application to switch between the Create Always and Create If Not Exists patterns that we discussed in section 8.3.2. The modified rendering code follows:
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ClickBox.prototype.render=function(){ this.body=null; if (reuseDOM){ this.body=document.getElementById(this.id); } if (this.body==null){ this.body=document.createElement("div"); this.body.id=this.id; newDOMs++; }else{ reusedDOMs++; } this.body.backingObj=this; this.body.className='box1'; this.body.style.left=this.x+"px"; this.body.style.top=this.y+"px"; this.body.onclick=function(){ var clickbox=this.backingObj; clickbox.incrementState(); } }
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Unlink On Hide checkbox When a ClickBox is removed from the container (either by a second click or by calling Container.clear()), this switch will determine whether it uses the Remove By Hiding or Remove By Detachment pattern (see section 8.3.2):
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ClickBox.prototype.hide=function(){ var bod=this.body;
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Performance
bod.className='box3'; if (unlinkOnHide){ bod.parentNode.removeChild(bod); } ... }
Break Cyclic References checkbox When removing a ClickBox widget, this toggle determines whether the references between the DOM element and the backing object are reset to null or not, using the Break Cyclic References pattern in an attempt to appease the Internet Explorer garbage collector:
ClickBox.prototype.hide=function(){ var bod=this.body; bod.className='box3'; if (unlinkOnHide){ bod.parentNode.removeChild(bod); } if (breakCyclics){ bod.backingObj=null; this.body=null; } }
Form controls allow the user to add ClickBoxes to the container and to clear the container. The application may be driven manually, but for the purposes of gathering results here, we have also written a stress-testing function that simulates several manual actions. This function runs an automatic sequence of actions, in which the following sequence is repeated 240 times:
1 2 3
Add 100 widgets to the container, using the populate() function. Add another 100 widgets. Clear the container.
The code for the stressTest function is provided here:
function stressTest(){ for (var i=0;i<240;i++){ populate (100); populate(100); container.clear(); } alert("done"); }
Designing for performance
Note that the functionality being tested here relates to the addition and removal of nodes from the container element, not to the behavior of individual ClickBoxes when clicked. This test is deliberately simple. We encourage you to develop similar stress tests for your own applications, if only to allow you to see whether memory usage goes up or down when changes are made. Designing the test script will be an art in itself, requiring an understanding of typical usage patterns and possibly of more than one type of usage pattern. Running the stress test takes over a minute, during which time the browser doesn t respond to user input. If the number of iterations is increased, the browser may crash. If too few iterations are employed, the change in memory footprint may not be noticeable. We found 240 iterations to be a suitable value for the machine on which we were testing; your mileage may vary considerably. Recording the change in memory footprint was a relatively primitive business. We ran the tests on the Windows operating system, keeping the Task Manager open. We noted the memory consumption of iexplore.exe directly after loading the test page and then again after the alert box appeared, indicating that the test had completed. top or a similar tool could be used for testing on UNIX (see section 8.4.1). We closed down the browser completely after each run, to kill off any leaked memory, ensuring that each run started from the same baseline. That s the methodology, then. In the following section, we ll see the results of performing these tests.
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