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CAUTION: Although a thread can have an event loop, your graphical user interface code (widgets and painting) must all run on the main thread Running user interface code any code that triggers painting to the screen on threads other than the main thread is not supported, and will yield unpredictable results The mechanics of managing the QThread are convenient, and made especially simple through the use of (you guessed it!) signals that the thread emits at various stages of its life The methods QThread provides are: exit, which exits the run method and terminates the thread isFinished returns true if the thread has run to completion, otherwise it returns false isRunning returns true if the thread is still running in its run method priority and setPriority let you obtain and modify the thread s priority stackSize and setStackSize let you determine and set the thread s stack size.

Note Persistent connections refers to a technology that attempts to improve the efficiency of opening

and closing database connections with no impact on functionality. You can learn more about this technology at http://www.php.net/manual/en/features.persistent-connections.php.

Figure 7-19. Conference Summary page template The class ActiveConferencePage extends the Tapestry BasePage. The ActiveConferencePage will serve as the base class for all conference pages, and it handles redirection to the Home page if a ConferenceSummary is not found. This class also showcases the use of annotations to inject application state objects, Tapestry pages, and services using the InjectState, InjectPage, and InjectObject annotations respectively. Annotations provide an alternate way to the page and component specifications to inject dependencies into your pages and components.

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Be careful using this method, because many devices have a relatively small maximum stack size anyway wait blocks the thread until either its run method exits, or the amount of time that you specify (the time value is in milliseconds) QThread provides the following slots (also usable as methods, of course): quit, which terminates a thread s event loop start, which starts a thread terminate, which forcibly exits a thread (In general, you should prefer using quit to terminate) NOTE: To terminate a thread, you can call exit from within the thread, or invoke the quit slot from outside the thread The signals that QThread provides are: finished, emitted when the thread s run method exits started, emitted when the thread s run method commences terminated, emitted if the thread is forcibly terminated Threads should be as independent as possible.

The alternative solution, and the one you ll use when implementing HatShop, can be described like this: 1. Open a connection to the database the first time you need to access the database during a request.

Listing 7-27. Base Page for All Conference-Specific Pages (ActiveConferencePage) package com.integrallis.techconf.web.tapestry.pages.common; import import import import import import import import import import import org.apache.tapestry.PageRedirectException; org.apache.tapestry.annotations.InjectObject; org.apache.tapestry.annotations.InjectPage; org.apache.tapestry.annotations.InjectState; org.apache.tapestry.event.PageBeginRenderListener; org.apache.tapestry.event.PageEvent; org.apache.tapestry.html.BasePage; com.integrallis.techconf.dto.ConferenceSummary; com.integrallis.techconf.service.ConferenceService; com.integrallis.techconf.web.tapestry.domain.LoggedInUser; com.integrallis.techconf.web.tapestry.pages.Home;

2. Execute all database functions (or SQL queries) through that connection without closing it. Here you also need to handle any possible errors. 3. Close the database connection when the client request finishes processing. Using this method, all database operations that happen for a single client request (which happens each time a user visits a new page of our site) will go through a single database connection, avoiding opening and closing the connection each time you need something from the database. You ll still use persistent connections to improve the efficiency of opening a new database connection for each client request. This solution is the one you will use for data access in the HatShop project.

Wherever you need inter-thread communication, you should use signals and slots in conjunction with a thread s event loop if you can However, there s no getting around the fact that if your threads share.

Now you should learn the theory about how to put this in practice using PHP PDO. You ll effectively write the code a bit later, when building the added functionality into the web site. As explained in 2, you won t access PostgreSQL through PHP s PostgreSQLspecific database functions but through a database abstraction layer (PHP PDO). The PDO classes permit accessing various data sources using the same API (Application Programming Interface), so you won t need to change the PHP data access code or learn different dataaccess techniques when working with database systems other than PostgreSQL (but you might need to change the SQL code itself if the database you migrate to uses a different dialect). Using PHP PDO makes your life as a programmer easier in the long run. The important PHP PDO class you ll work with is PDO, which provides methods for performing various database operations.

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