


/// <reference name="MicrosoftAjax.debug.js" />
/// <reference name="MicrosoftAjaxTimer.debug.js" />
/// <reference name="MicrosoftAjaxWebForms.debug.js" />

(function() {
var scriptName = "ExtendedThreading";

function execute() {

var version = Sys.version;
if (!version && !Sys._versionChecked) {
    Sys._versionChecked = true;
    throw new Error("AjaxControlToolkit requires ASP.NET Ajax 4.0 scripts. Ensure the correct version of the scripts are referenced. If you are using an ASP.NET ScriptManager, switch to the AjaxScriptManager in System.Web.Ajax.dll, or use the ToolkitScriptManager in AjaxControlToolkit.dll.");
}

Type.registerNamespace('Sys.Extended.UI');

Sys.Extended.UI.DeferredOperation = function(delay, context, callback) {
    /// <summary>
    /// Used to define a cancellable async operation
    /// </summary>
    /// <param name="delay" type="Number" integer="true">the number of milliseconds to delay execution</param>
    /// <param name="context" type="Object" mayBeNull="true">an object used as the context for the callback method</param>
    /// <param name="callback" type="Function">The callback method to execute at the end of the delay</param>
    
    this._delay = delay;
    this._context = context;
    this._callback = callback;
    this._completeCallback = null;
    this._errorCallback = null;
    this._timer = null;
    this._callArgs = null;
    this._isComplete = false;
    this._completedSynchronously = false;
    this._asyncResult = null;
    this._exception = null;
    this._throwExceptions = true;
    this._oncomplete$delegate = Function.createDelegate(this, this._oncomplete);
    
    // post to ensure that attaching it always gets the port as its context
    this.post = Function.createDelegate(this, this.post);
}
Sys.Extended.UI.DeferredOperation.prototype = {
    
    get_isPending : function() { 
        /// <summary>
        /// Gets whether there is an asynchronous operation pending
        /// </summary>
        /// <returns type="Boolean" />
        
        return (this._timer != null); 
    },
    
    get_isComplete : function() { 
        /// <summary>
        /// Gets whether the asynchronous operation has completed
        /// </summary>
        /// <returns type="Boolean" />
        
        return this._isComplete; 
    },
    
    get_completedSynchronously : function() {
        /// <summary>
        /// Gets whether the operation completed synchronously
        /// </summary>
        /// <returns type="Boolean" />
        
        return this._completedSynchronously;
    },
    
    get_exception : function() {
        /// <summary>
        /// Gets the current exception if there is one
        /// </summary>
        /// <returns type="Error" />
        
        return this._exception;
    },
    
    get_throwExceptions : function() {
        /// <summary>
        /// Gets whether to throw exceptions
        /// </summary>
        /// <returns type="Boolean" />
        
        return this._throwExceptions;
    },    
    set_throwExceptions : function(value) {
        /// <summary>
        /// Sets whether to throw exceptions
        /// </summary>
        /// <param name="value" type="Boolean">True if exceptions should be thrown, otherwise false</param>
        
        this._throwExceptions = value;
    },
    
    get_delay : function() { 
        /// <summary>
        /// Gets the current delay in milliseconds
        /// </summary>
        /// <returns type="Number" integer="true" />
        
        return this._delay; 
    },
    set_delay : function(value) { 
        /// <summary>
        /// Sets the current delay in milliseconds
        /// </summary>
        /// <param name="value" type="Number" integer="true">The delay in milliseconds</param>
        
        this._delay = value; 
    },
    
    post : function(args) {
        /// <summary>
        /// A method that can be directly attached to a delegate
        /// </summary>
        /// <param name="args" type="Object" parameterArray="true">The arguments to the method</param>
        
        var ar = [];
        for (var i = 0; i < arguments.length; i++) {
            ar[i] = arguments[i];
        }
        this.beginPost(ar, null, null);
    },
    
    beginPost : function(args, completeCallback, errorCallback) {
        /// <summary>
        /// Posts a call to an async operation on this port
        /// </summary>
        /// <param name="args" type="Array">An array of arguments to the method</param>
        /// <param name="completeCallback" type="Function" optional="true" mayBeNull="true">The callback to execute after the delayed function completes</param>
        /// <param name="errorCallback" type="Function" optional="true" mayBeNull="true">The callback to execute in the event of an exception in the delayed function</param>
        
        // cancel any pending post
        this.cancel();
        
        // cache the call arguments
        this._callArgs = Array.clone(args || []);
        this._completeCallback = completeCallback;
        this._errorCallback = errorCallback;
        
        if (this._delay == -1) {            
            // if there is no delay (-1), complete synchronously
            try {
                this._oncomplete();
            } finally {
                this._completedSynchronously = true;
            }
        } else {            
            // complete the post on a seperate call after a delay
            this._timer = setTimeout(this._oncomplete$delegate, this._delay);
        }
    }, 
    
    cancel : function() {
        /// <summary>
        /// Cancels a pending post
        /// </summary>
        
        if (this._timer) {
            clearTimeout(this._timer);
            this._timer = null;
        }
        this._callArgs = null;
        this._isComplete = false;
        this._asyncResult = null;
        this._completeCallback = null;
        this._errorCallback = null;
        this._exception = null;
        this._completedSynchronously = false;
    },
    
    call : function(args) {
        /// <summary>
        /// Executes the deferred operation synchronously
        /// </summary>
        /// <param name="args" type="Object" parameterArray="true">The arguments to the method</param>
        
        var ar = [];
        for (var i = 0; i < arguments.length; i++) {
            ar[i] = arguments[i];
        }
        
        // cancel any pending post
        this.cancel();
        
        // cache the call arguments
        this._callArgs = ar;
        this._completeCallback = null;
        this._errorCallback = null;
        
        try {
            this._oncomplete();
        } finally {
            this._completedSynchronously = true;
        }
        if (this._exception) {
            throw this._exception;
        }
        return this._asyncResult;
    },
    
    complete : function() {
        /// <summary>
        /// Completes a pending post synchronously
        /// </summary>        
        
        if (this._timer) {
            try {
                this._oncomplete();
            } finally {
                this._completedSynchronously = true;
            }
            return this._asyncResult;
        } else if (this._isComplete) {
            return this._asyncResult;
        }
    },    
    
    _oncomplete : function() {
        /// <summary>
        /// Completes a pending post asynchronously
        /// </summary>

        var args = this._callArgs;
        var completeCallback = this._completeCallback;
        var errorCallback = this._errorCallback;
        
        // clear the post state
        this.cancel();
        try {
            // call the post callback
            if (args) {
                this._asyncResult = this._callback.apply(this._context, args);
            } else {
                this._asyncResult = this._callback.call(this._context);
            }
            this._isComplete = true;
            this._completedSynchronously = false;
            if (completeCallback) {
                completeCallback(this);
            }
        } catch (e) {
            this._isComplete = true;
            this._completedSynchronously = false;
            this._exception = e;
            if (errorCallback) {
                if (errorCallback(this)) {
                    return;
                }
            } 
            if (this._throwExceptions) {
                throw e;
            }
        }
    }
}
Sys.Extended.UI.DeferredOperation.registerClass("Sys.Extended.UI.DeferredOperation");

} // execute

if (window.Sys && Sys.loader) {
    Sys.loader.registerScript(scriptName, ["Core"], execute);
}
else {
    execute();
}

})();
