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Lazy construction: Activate a new thread only when a request cannot be serviced immediately by an existing idle thread Lazy construction allows users to provide large enough pool size limits to avoid underutilization problems occurring when fewer threads are running than a given computer can handle This comes at the minor expense of occasionally higher latencies when a new request causes a new thread to be created The start-up effects of lazy construction can be tempered by creating a small number of "warm" threads upon construction of the pool Idle time-outs: Allow threads to time out waiting for work and to terminate upon time-out This eventually causes all workers to exit if the pool is not used for prolonged periods When

coupled with lazy construction, these dead threads will be replaced with new ones if the request rate later increases In heavily resource-conscious applications, you may also associate other resources (such as sets of reusable graphical objects) with each worker thread, thus combining resource pools (see 3412) with thread pools Cancellation You may need to distinguish cancellation (see 312) of a task from cancellation of the worker thread performing that task One approach is:

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Templates consist of HTML elements, controls, and embedded Server controls that allow you to customize and manipulate the layout of a particular control. For example, you can customize the layout of the individual rows, alternating rows, or selected rows of a DataList or DataGrid ASP.NET Server control by defining different templates. Then, at run time, instead of the default HTML, the contents of the templates are rendered on the page. You can define templates to control the layout of different portions such as header item, footer item, edit item, selected item, alternating item, or separator of a control according to your requirements. Different types of templates are available depending on the portion of the control for which the template is defined. For example, the template defined for the header of a control is called HeaderTemplate. However, not all the Server controls support templates. The Server controls that support templates are Repeater, DataList, and DataGrid. Also, not all types of templates are supported by all the controls that support templates. Table 11-1 lists the different types of templates and the controls that support them. Table 11-1: Templates and the supporting controls Template ItemTemplate Description The set of elements and controls that are rendered once for each row in the data source. The set of elements and controls that are rendered once for every alternating row in the data source. The set of elements and controls that are rendered when an item is selected in the control. The set of elements and controls that are rendered when an item is in Edit mode. Supported by Repeater, DataList, and DataGrid

Upon interruption, allow the current worker thread to die, but replace it if necessary with a fresh worker thread if the work queue is not empty or when a new incoming task arrives Provide a shutdown method in the worker thread class that causes existing workers to die and no additional workers to be created

Additionally, you may need to trigger some kind of error handling if a Host thread is cancelled during a task hand-off While the silent swallowing of InterruptedException without queuing a task seen in PlainWorkerPool conforms to the minimal requirements of oneway messagepassing frameworks, most applications need to take other remedial actions 4142 Event queues

Table 11-1: Templates and the supporting controls Template HeaderTemplate Description The set of elements and controls that are rendered once before all the items in the control. The set of elements and controls that are rendered once after all the items in the control. The set of elements that are rendered between each row. The set of elements and controls that are rendered while paging the information. Supported by Repeater, DataList, and DataGrid

Many event-based frameworks (including the ones supported in the javaawt and javaxswing packages) rely on designs in which exactly one worker thread operates on an unbounded queue The queue holds instances of EventObject that must be dispatched (as opposed to Runnable objects that self-dispatch), normally to listener objects defined by the application Often the listeners are the same objects as those that initially generate events The use of a single thread operating on a single event queue simplifies usage compared to general worker-thread designs, but also imposes some limitations that are characteristic of event frameworks:

The ordering properties of a queue can be exploited to optimize handling For example, automatic event-filtering techniques can be used to remove or combine duplicate repaint

Again, you can manipulate the look and layout of individual controls by using styles; however, you should not confuse styles with templates. Styles are used to specify the appearance of controls by setting specific properties, such as color, font, and width. On the other hand, templates are sets of HTML elements and controls that provide a specific layout to specific portions of a control. You can use styles with the controls that do not have templates defined for them. Also, you can use styles with the controls that have templates defined. For such controls, you can use styles to specify the appearance of the elements that define the template. Before proceeding to create templates for the Repeater, DataList, and DataGrid Server controls, you need to understand the basic features of these controls, described next. Repeater control The Repeater control allows you to create custom lists to display data from different data sources. Unlike other Server controls, such as TextBox and ListBox, the Repeater control does not have a default look and layout. You need to provide the layout to the Repeater control by creating templates. Because it is you who provides the layout to the control, you can create any kind of list for the control, depending on your requirements.

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