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public string LookupAddress(string theRecipientName) { if (recipients.ContainsKey(theRecipientName)) return recipients[theRecipientName] as string;
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CHAPTER 8 THE MECHANICS OF EVENT FIRING
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else { // lookup recipient's address in Directory Service string address = DirectoryService.Lookup(theRecipientName); recipients.Add(theRecipientName, address); return address; } } public void SendMessage(string theRecipientName, string theMessage) { // get recipient's address string address = LookupAddress(theRecipientName); // send message ... } } Listing 8-4. Sending Messages Through a Messaging Object, in VB .NET Public Class Initializer Public Sub InitializeSender(ByVal theSender As Sender, _ ByVal theMessagingObject As Messaging) theSender.Recipient = "Accounting" AddHandler theSender.OnSendMessage, AddressOf theMessagingObject.SendMessage End Sub End Class Public Class Sender Private _recipient As String Public Property Recipient() As String Get Return _recipient End Get Set(ByVal Value As String) _recipient = Value End Set End Property Public Sub SendMessage() ' fire the OnSendMessage event FireSendMessage(Recipient, "Hello") End Sub Public Event OnSendMessage(ByVal theName As String, ByVal theMessage As String) Public Sub FireSendMessage(ByVal theName As String, ByVal theMessage As String) RaiseEvent OnSendMessage(theName, theMessage) End Sub End Class Public Class Messaging Private recipients As New Hashtable
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' key is name, value is address
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Public Function LookupAddress(ByVal theRecipientName As String) As String If (recipients.ContainsKey(theRecipientName)) Then Return CStr(recipients(theRecipientName)) Else ' lookup recipient's address in Directory Service Dim address As String = DirectoryService.Lookup(theRecipientName) recipients.Add(theRecipientName, address) Return address End If End Function Public Sub SendMessage(ByVal theRecipientName As String, _ ByVal theMessage As String) ' get recipient's address Dim address As String = LookupAddress(theRecipientName) ' send message ... End Sub End Class The messages described so far use text payloads. Messages are often used to transfer other types of information, such as serialized objects, name-value pairs, and binary arrays. While text is pretty much platform-independent, other types of payloads may not be. For example, if a message contains a serialized Java object, the payload will only be useful to Java recipients. For binary payloads, the format of binary values (little- or big-endian) may be an issue.
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Once you move all messaging details into a separate Messaging component, it becomes much easier to add certain features that middleware systems commonly support. For example, you can add internal queues that buffer incoming messages, in case the recipient is temporarily disconnected or the messages arrive faster than they can be delivered. In the previous example, incoming messages arrived synchronously with the sender via procedure calls. Outgoing messages were delivered to recipients using a network connection or other shared resource. It is common to use separate threads to handle incoming and outgoing traffic, with the internal queues serving as the rendezvous point of the two threads. The incoming thread adds messages to the queue, and the outgoing thread removes messages, as shown in Figure 8-3.
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MessageQueue
Outgoing Thread
Add Message() Remove Message()
Figure 8-3. Using a queue to buffer incoming messages Listing 8-5 and Listing 8-6 show possible implementations, in C# and VB .NET.
CHAPTER 8 THE MECHANICS OF EVENT FIRING
Listing 8-5. Queuing Messages in the Messaging Component, in C# using System.Threading; public class MessageQueue { // items of this type are put in the queue class QueuedItem { public string address; // address of recipient public string message; // message to deliver public QueuedItem(string theAddress, string theMessage) { address = theAddress; message = theMessage; } } Hashtable recipients = new Hashtable(); Queue incomingMessages = new Queue(); Thread deliveryThread; private bool stopDeliveryRequested; public void StopDelivery() { stopDeliveryRequested = true; } public MessageQueue() { deliveryThread = new Thread(new ThreadStart(MessageProcessor) ); deliveryThread.Start(); } void MessageProcessor() { while (!stopDeliveryRequested) { ProcessNextMessage(); Thread.Sleep(10); // pause for 10 ms } } // this method executes on the outgoing thread void ProcessNextMessage() { QueuedItem item; if (incomingMessages.Count == 0) return; lock(incomingMessages) { item = incomingMessages.Dequeue() as QueuedItem; } DeliverMessage(item.address, item.message); } // key is name, value is address // the message queue // handles delivery to recipients
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