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Implementing the Asynchronous Class Having determined asynchronous XMLHttpRequests are the way to go, the Asynchronous encapsulation class is defined An encapsulation class is not necessary, but it makes it simpler to work with the XMLHttpRequest object The main advantage of using an encapsulation class is the association of the XMLHttpRequest object with a code block For a refresher, let s look at the code to load an Atom feed again: function LoadAtomFeed() { var asynchronous = new Asynchronous(); asynchronoussettings = { onComplete : function(xmlhttp) { parseAtom( xmlhttpresponseXML); flexboxupdate(); } } asynchronousget("/services/blog/entries/current"); } To make the Asynchronous class work, the user needs to do two things: associate the settings data member with some information and call an appropriate method (eg, get) to make an HTTP request The purpose of the settings data member is to provide the callbacks and extra information associated with a request.

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this function is limited to text-based transcripts. Audio and Video chats, once initiated, are peer-to-peer and, as such, the server never sees the data..

After you have created, imported, or looked up an existing Contact, you can start making changes to it. This might involve adding new fields, editing existing fields, or removing fields. Keep in mind that you can only edit items from a list that was opened with WRITE_ONLY or READ_WRITE access.

The serveradmin command can again be used to list additional configuration settings for the service:

Most of the fields in the Contact class have only a single value associated with them. To edit them, provide a new value of the appropriate type, as previously shown in Table 6-1.

hax.lbc:~ hunterbj$ sudo serveradmin settings jabber jabber:enableAutoBuddy = no jabber:s2sAllowedDomains = _empty_array jabber:requireSecureS2S = no jabber:sslCAFile = "/etc/certificates/hax.lbc.chcrt" jabber:sslKeyFile = "/etc/certificates/hax.lbc.crtkey" jabber:hosts:_array_index:0 = "hax.lbc" jabber:authLevel = "ANYMETHOD" jabber:s2sRestrictDomains = no jabber:savedChatsArchiveInterval = 7 jabber:eventLogArchiveInterval = 7 jabber:savedChatsLocation = "/var/jabberd/message_archives" jabber:enableSavedChats = yes

In the example, the onComplete method is called once the HTTP request has completed The code as it stands is fairly easy to understand, but remember that the code is asynchronous As a result, when the asynchronousget method is called, the LoadAtomFeed function will exit before calling onComplete and returning control to the user In a worst-case scenario, if a user goes click-crazy, there could be dozens of requests being made The alternative is to use synchronous calls, which lock the browser, and that itself is not an option On the positive side, asynchronous behavior allows a user to launch tasks and wait for the results The programmer has to remain vigilant and make sure that the user does not get ahead of him- or herself.

jabber:enableXMPP = no jabber:logLevel = "ALL"

Strings can be directly added to a contact record, as shown here. contact.addString(Contact.ORG, PIMItem.ATTR_NONE, "Engineering"); You can modify an existing string value by calling the setString() method with an appropriate index. contact.setString(Contact.TITLE, 0, PIMItem.ATTR_NONE, "Senior Engineer");

If you do not host your own iChat server and still want to save chat transcripts, the iChat application can fulfill that role. To manually configure transcripts per user in iChat, select Preferences from the iChat menu. Click on the messages tab to access the functionality to save chat, shown in Figure 5-30.

How can you know which version to call Most string fields can only accept a single entry. If you try to add a new entry when one already exists, a FieldFullException will be thrown. Conversely, if you try to set a field and no value is currently set, you ll get an IndexOutOfBoundsException. If you have just created a blank new contact, you can safely call addString() since no fields currently exist. Otherwise, you should check to see whether the field already has any values, and then set or update it appropriately as in the following example.

Now that you have a basic understanding of how to use the Asynchronous class, let s look at the details of the Asynchronous implementation The class exposes a method for each HTTP verb, and in the example the get method corresponds to the HTTP verb GET The implementation of get is as follows: function HttpRequest_get(strurl) { thiscall({ action : "GET", url: strurl}); } In the implementation of HttpRequest_get, which is mapped to Asynchronousget, a reference to the function call is made The get function is a convenience method to the call method The call method accepts a single parameter: an object with specific data members In the case of the get method, the action and url data members are defined So why create an object, when you could have used two parameters, action and url, for the method call The answer is flexibility.

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