COMMUNICATING WITH THREADS in Visual C#

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{ SendingThread= new Thread(new ThreadStart(ThreadMethod)); ServerName="mail"; From=To="noone@nowhere.com"; Subject="Test from code " ; Body = "This is the Body"; TimeToSendNotification=false; SendingThread.Name="SMTPThread"; SendingThread.Start(); } . . . private void ThreadMethod() { while(true) { try { Controls when a if (TimeToSendNotification) message is sent { SmtpMail.SmtpServer = ServerName; SmtpMail.Send(From,To,Subject,Body); TimeToSendNotification=false; } Thread.Sleep(1000); } catch(Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); } } } } }
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Since sending an email message involves connecting to a mail server through the network, it may take a relatively long time. It is better to send the message on a different thread than the one monitoring the web site. The notification thread is dedicated to sending notification email messages. It sleeps the majority of the time, waking up to check for work and then sleeping again. When the monitoring thread determines that a web site is down and that it should notify someone, it sets a public Boolean field, TimeToSendNotification, to true. This indicates that it is time to send a message. The notification thread sees this, and uses the From, To, Subject, and Body public fields to send the email message. While having one thread control the operation of another is the idea, this approach introduces many problems. Setting the public fields must be done in the proper sequence. Generally, performing a series of assignments in a certain order is not a good thing.
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Since the fields are public, every consumer of the class has access to those data elements. This means that there is no restriction as to who can manipulate those values, and in what order. It also means that the user of the object must be familiar with how the object behaves. This violates the concept of encapsulation.
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One way for one thread to communicate with another is to set public fields. The issues with this approach are: Decreased encapsulation of information other objects are required to know too much about the inner workings of an object. The lack of synchronization opportunities. The possibility that data changes are missed due to timing issues.
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Any value can be assigned to the fields since there is no validation mechanism. The only validation that can be performed is before the message is actually sent. Ideally we would not allow the value to be assigned if it isn t valid. We will cover this in the next section on properties. In the next chapter we will discuss synchronization concepts in detail. For now, synchronization becomes an issue when multiple threads are manipulating the same data. One thread may change the value while another is accessing it. When this occurs, the results of the interaction become indeterminate. This is one of the biggest challenges of multithreaded programming and is amplified by allowing direct manipulation of data elements. The web site monitoring thread does not stop and wait for the notification thread to finish its work (figure 6.1). There is the possibility that during the time the notification thread is sending the message the web site monitoring thread may determine that the web site is still down and that another message should be sent. The web site monitoring thread would populate the To, From, Body, and Subject fields and then set the TimeToSendNotification field to true. During this time, the TimeToSendNotification field would already be true since the notification thread is in the process of sending the message. Once that message is sent, the notification thread would set the TimeToSendNotification to false. This means that the second notification message would not be sent. If more than one web site is being monitored, the failure of one site might not be reported because of the slow notification time.
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