Adobe air workers

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Where can you run this program? Is there a better alternative? To change a listener's priority, you must first call removeListener. Then you can register the listener again with the new priority level. Keep in mind that after the listener is registered, subsequent calls to addEventListener with a different type or useCapture value result in the creation of a separate listener registration.

For example, if you first register a listener with useCapture set to true , it listens only during the capture phase. If you call addEventListener again using the same listener object, but with useCapture set to false , you have two separate listeners: one that listens during the capture phase and another that listens during the target and bubbling phases.

You cannot register an event listener for only the target phase or the bubbling phase. Those phases are coupled during registration because bubbling applies only to the ancestors of the target node.

If you no longer need an event listener, remove it by calling removeEventListener , or memory problems could result. Event listeners are not automatically removed from memory because the garbage collector does not remove the listener as long as the dispatching object exists unless the useWeakReference parameter is set to true.

Copying an EventDispatcher instance does not copy the event listeners attached to it. If your newly created node needs an event listener, you must attach the listener after creating the node.

However, if you move an EventDispatcher instance, the event listeners attached to it move along with it. If the event listener is being registered on a node while an event is being processed on this node, the event listener is not triggered during the current phase but can be triggered during a later phase in the event flow, such as the bubbling phase.

If an event listener is removed from a node while an event is being processed on the node, it is still triggered by the current actions. After it is removed, the event listener is never invoked again unless registered again for future processing. Parameters type : String — The type of event. This function must accept an Event object as its only parameter and must return nothing , as this example shows: Copy function evt:Event :void The function can have any name.

Class-level member functions are not subject to garbage collection, so you can set useWeakReference to true for class-level member functions without subjecting them to garbage collection. If you set useWeakReference to true for a listener that is a nested inner function, the function will be garbage-collected and no longer persistent. If you create references to the inner function save it in another variable then it is not garbage-collected and stays persistent.

Creates a new MessageChannel instance to send messages from the worker on which the method is called to another receiver worker. Code in the worker that creates the MessageChannel object can use it to send one-way messages to the Worker object specified as the receiver argument. Although a MessageChannel instance can be used to send messages and data from one Worker instance to another, at least one MessageChannel instance needs to be passed to a child Worker as a shared property by calling the Worker object's setSharedProperty method.

Parameters receiver : Worker — The worker that will receive messages transmitted via the created message channel. Retrieves a value stored in this worker with a named key. Code in a child worker can call this method to retrieve a value as early as in the constructor of the worker swf's main class. Parameters key : String — The name of the shared property to retrieve.

Removes a listener from the EventDispatcher object. If there is no matching listener registered with the EventDispatcher object, a call to this method has no effect.

If the listener was registered for both the capture phase and the target and bubbling phases, two calls to removeEventListener are required to remove both, one call with useCapture set to true , and another call with useCapture set to false.

Provides a named value that is available to code running in the worker's swf. You can call this method before calling the worker's start method. In that case the shared property is available to code in the worker's swf at construction time. The value passed to the value parameter can be almost any object. Other than the exceptions noted below, any object that is passed to the value parameter is not passed by reference.

Any changes made to the object in one worker after setSharedProperty is called are not carried over to the other worker.

The object is copied by serializing it to AMF3 format and deserializing it into a new object in the receiving worker. For this reason, any object that can't be serialized in AMF3 format, including display objects, can't be passed to the value parameter.

In order for a custom class to be passed properly, the class definition must be registered using the flash. With either technique the same alias must be used for both worker's versions of the class. There are five types of objects that are an exception to the rule that objects aren't shared between workers:.

If you pass an instance of these objects to the value parameter, each worker has a reference to the same underlying object. Changes made to an instance in one worker are immediately available in other workers.

In addition, if you pass the same instance of these objects more than once using setSharedProperty , the runtime doesn't create a new copy of the object in the receiving worker. Instead, the same reference is re-used, reducing system memory use. Calling this method with null or undefined for the value argument clears any previously-set value for the specified key argument.

Cleaning up a value in this way removes the reference to it, allowing it to be garbage collected. You can use any String value in the key argument. These shared properties are available to any code that has access to a worker. To avoid unintentionally overwriting a value, consider using a prefix, suffix, or similar mechanism to attempt to make your key names unique.

Parameters key : String — The name under which the shared property is stored. Starts the execution of the worker. The runtime creates the worker thread and calls the constructor of the worker swf's main class. This operation is asynchronous. Once the worker startup is complete, it changes its state property to WorkerState. Stops this worker's code execution. Calling this method aborts any current ActionScript in the worker's swf.

This example consists of three ActionScript classes: WorkerExample is the main class and the parent worker. BackgroundWorker is the class that does the background work. AIR is, first of all, a runtime engine at its most basic. A runtime engine is simply computer software that other applications need to use in order to run properly; it translates language within a program into machine language, the simple, lowest level language essentially 0s and 1s the central processing unit CPU can understand.

Programs that run on Java , for example, require the Java Virtual Machine runtime engine installed on the computer. Without it, your computer wouldn't be able to make use of the same graphical user interface GUI that you're used to using now.

A GUI, also known as a human-computer interface , is the combination of windows, icons, text and menus that we can change with a mouse or a keyboard. Even your operating system can be considered the mother of all runtime engines, since every application on your computer depends on the processes of the operating system.

So when Adobe describes AIR as a "cross-operating system runtime," they just mean that AIR is a runtime that can work on any computer, regardless of the operating system. Different operating systems use different languages; a program running on Mac OSX, for instance, won't look the same as the same program running on Windows XP.

That's the big difference between something like a Flash player and AIR: While Flash works over the Internet and in your Web browser, applications running off of AIR are based on the desktop and don't necessarily require a browser to work. An RIA is a broad term coined by Adobe that describes a Web application that provides an engaging, connected experience for users.

In general, they're meant to provide the best aspects of both desktop applications and Web-based applications and are developed with programs like Adobe Flash or Flex -- Web sites like Flickr or Google Maps are examples -- sites that offer lots of interaction but are located on the Internet. RIAs are easy to use but difficult to program, so many hope the release Adobe AIR will make such development processes smoother. That's what AIR does for you computer applications, but what does it do for developers, businesses and everyone else?

In a general sense, nearly all of Adobe's products are meant to benefit three groups: developers, businesses and end users. Developers use programs like Adobe Flash to create an interface or an animation ; a company then takes the design and employs it on a Web page or an application; a customer uses the product in unique and entertaining ways.

Even the end user isn't limited to a passive experience. Many people can download or install Adobe programs like Flash or Photoshop and find their own ways to exercise their creativity. Developers who use Adobe Flex, Flash or any other development tool can build applications that sync with the AIR runtime. Adobe also markets its AIR platform toward businesses looking to hook consumers with more attractive and usable applications.