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IL_0005: ldstr "Assigning to False is not allowed" IL_000a: newobj instance void [mscorlib]System.Exception::.ctor(string) IL_000f: throw IL_0010: nop IL_0011: ldarg.0 IL_0012: ldfld bool PublicProperties.SMTPNotification::mTimeToSendNotification IL_0017: ldc.i4.1 IL_0018: bne.un.s IL_0025 IL_001a: ldstr "Missed notification" IL_001f: newobj instance void [mscorlib]System.Exception::.ctor(string) IL_0024: throw IL_0025: nop IL_0026: ldarg.0 IL_0027: ldarg.1 IL_0028: stfld bool PublicProperties.SMTPNotification::mTimeToSendNotification IL_002d: nop IL_002e: ret } // end of method SMTPNotification::set_TimeToSendNotification
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Notice that the method name is set_TimeToSendNotification. The compiler maps the Set portion of the property to a method named set_PropertyName, where PropertyName is the name of the property. This lets us see that properties are intended to make it easy for developers to wrap access to data elements with methods. This follows a common approach of writing a Get and Set method for each data element of a class. If a property includes a Get portion, a method named get_PropertyName is also generated. In the case of TimeToSendNotification the MSIL is shown in listing 6.3.
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Listing 6.3 The Get portion of the TimeToSendNotification property (MSIL)
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.method public specialname instance bool get_TimeToSendNotification() cil managed { // Code size 12 (0xc) .maxstack 1 .locals init ([0] bool TimeToSendNotification) IL_0000: nop IL_0001: ldarg.0 IL_0002: ldfld bool PublicProperties.SMTPNotification::mTimeToSendNotification IL_0007: stloc.0 IL_0008: br.s IL_000a IL_000a: ldloc.0 IL_000b: ret } // end of method SMTPNotification::get_TimeToSendNotification
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Notice that the return data type of the get_TimeToSendNotification method is bool, just as the data type of the single parameter to set_TimeToSendNotification was also bool. It isn t important to understand all of the MSIL; however, by looking at it you can often learn a great deal. In our example, the web site monitoring thread determines that the site is down. It checks to see if it has been instructed to send notification messages. If it has, it sets the various properties on the class associated with the notification thread and then sets the TimeToSendNotification property to true. This changes the private data element that controls when the notification thread sends email messages. If a second assignment is made to TimeToSendNotification before the sending of the message is complete and the value of the internal data element is set to true, an exception is raised. We will address this particular problem with a more robust solution involving the use of queues between threads. 6.1.3 Queues and threads People work at different speeds. Some work very quickly; others take longer to accomplish their tasks. This is true of threads as well. One thread may be able to do its work very quickly while another may take longer. Often a thread will receive a rapid succession of elements to deal with and then have long periods where it is idle. A way to handle these situations is to utilize a queue. Recall that a queue is a first-in, first-out collection. Logically, an element is added at the end of the queue and is later retrieved from the front. This works well with threading issues.
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Threads execute at different speeds and a queue can act as a buffer between them. Queues enable the sequential processing of entries. Queues allow the workload to be spread out over a longer period of time. Fire-and-forget situations are good uses of queues.
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In the last section we saw how public properties address many of the issues with thread communication. Several issues could not be overcome using properties. The biggest issue is that properties accept a single value. This means that multiple properties need to be set in order to perform the desired task. One way of dealing with this might be to have a property that deals with an object, in our case a MailMessage object. MailMessage objects are in the System.Web.Mail namespace and represent an SMTP mail message. There are no technical reasons why setting a property couldn t add an instance of the MailMessage object to a queue; however, this is not how properties are expected to behave. Instead a public method is a more logical fit. In listing 6.4 the SendNotification method accepts four parameters and assigns them to the properties of the MailMessage object. It then adds that object to the notification queue. The notification queue is an instance of the Collections.Queue class. It is instantiated in the constructor.
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