Understanding ColdFusion MX Components in Java

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22 Understanding ColdFusion MX Components
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But this method doesn t serve you well at all, because it hard-codes CompanyID 10 into the initialization function. Passing an argument to the initialization area of a component is impossible, so you can call InitCompany() only from within the component initialization area. The trick is to create an initialization function that takes an optional argument containing a
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CompanyID and then set an additional property that describes whether the component is ini-
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tialized with empty values or data from a database record, as follows:
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<cfscript> This.lockName = CreateUUID(); InitCompany(); </cfscript> <cffunction name= InitCompany returntype= void > <cfargument name= companyID type= numeric required= no > <cfscript> if (IsDefined( Arguments.companyID )) { CompanyInitRec = GetCompany(Arguments.companyID); This.companyID = CompanyInitRec.companyID; This.companyName = CompanyInitRec.companyName; This.address = CompanyInitRec.address; This.city = CompanyInitRec.city; This.state = CompanyInitRec.state; This.zipCode = CompanyInitRec.zipCode; This.comments = CompanyInitRec.comments; This.isNewCompany = FALSE; } else { This.companyID = 0; This.companyName = ; This.address = ; This.city = ; This.state = ; This.zipCode = ; This.comments = ; This.isNewCompany = TRUE; } </cfscript> <cfreturn> </cffunction>
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After an instance of the component is first created, the initialization area executes InitCompany() with no arguments, so the component properties are all initialized to a blank canvas of empty strings and a companyID of 0. If you want to edit an existing company in your wizard, you simply call this same InitCompany() function and pass the CompanyID of the company record that you want to acquire, and your component properties get initialized to the values stored in the database. The other important thing that you do is to create an additional property named isNewCompany that indicates whether the component instance currently represents a new company to be created in the database or an existing company to be updated in the database. The following section shows how the isNewCompany property is used.
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Part IV ColdFusion MX Components, Web Services, and Flash Integration
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A FlushEntityToDatabase() function that sends data to the database
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Your component s properties eventually must find their way to the database so that they can persist longer than the timeout of the Session or Application scope into which the component is instantiated. For this purpose, you create a function that either inserts or updates the record in the database, depending on whether the properties represent a new or an existing record, as the following example shows:
<cffunction name= FlushCompanyToDatabase returntype= void > <cfif This.isNewCompany> <cfquery name= insCompany datasource= #Request.MainDSN# > INSERT INTO Company( CompanyName, Address, City, State, ZipCode, Comments ) VALUES ( #Trim(This.companyName)# , #Trim(This.address)# , #Trim(This.city)# , #Trim(This.state)# , #Trim(This.zipCode)# , #Trim(This.comments)# ) </cfquery> <cfelse> <cfquery name= updCompany datasource= #Request.MainDSN# > UPDATE Company SET CompanyName = #Trim(This.companyName)# , Address = #Trim(This.address)# , City = #Trim(This.city)# , State = #Trim(This.state)# , ZipCode = #Trim(This.zipCode)# , Comments = #Trim(This.comments)# WHERE CompanyID = #This.companyID# </cfquery> </cfif> <cfreturn> </cffunction>
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Notice that the meat and potatoes of this function are taken from the two previous CreateCompany() and UpdateCompany() component functions. Because the instance of the component is self-aware of its own state, you need call only a single function and have the instance decide for itself how to persist the component s properties in the database.
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22 Understanding ColdFusion MX Components
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Where to apply locking
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If you ve been highly suspicious of the persistent component in the preceding sections, you re on the ball! If you re going to persist this component in the Session scope, where does the locking go The complete answer is, Anywhere that you access the This scope after initialization. Because you no longer need to worry about data corruption in shared-memory scopes, you now must concern yourself only with preventing race conditions, where two pieces of code attempt to access the same shared-memory variables at the same moment. During initialization of a component instance into the Session or Application scope, nothing except the single line of code that creates the object (the CFOBJECT tag or the CreateObject() function) can possibly access that object, so locking is not needed to set This.lockName, nor is it needed if InitCompany() is called from the initialization area of the component, so you can eliminate the use of CFLOCK there. You do, however, need to lock the portions of the InitCompany() function that access the This scope during all later calls, and because such code is inside a CFSCRIPT tag pair, you must lock the entire CFSCRIPT block. And because this access modifies the This scope rather than simply reading it, the lock needs to be an exclusive one, as in the following example:
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<cflock name= #This.lockName# timeout= 10 throwontimeout= Yes type= EXCLUSIVE > <cfscript> if (IsDefined( Arguments.companyID )) { CompanyInitRec = GetCompany(Arguments.companyID); This.companyID = CompanyInitRec.companyID; This.companyName = CompanyInitRec.companyName; This.address = CompanyInitRec.address; This.city = CompanyInitRec.city; This.state = CompanyInitRec.state; This.zipCode = CompanyInitRec.zipCode; This.comments = CompanyInitRec.comments; This.isNewCompany = FALSE; } else { This.companyID = 0; This.companyName = ; This.address = ; This.city = ; This.state = ; This.zipCode = ; This.comments = ; This.isNewCompany = TRUE; } </cfscript> </cflock> This.lockName is guaranteed to contain a universally unique value, which means that you acquire a granular lock inside this instance of your component without blocking access to any other code in your application that doesn t use this same instance of the component. The only other function in your persistent component that requires locking is the FlushCompanyToDatabase() function, because it reads from the This scope, as the following example shows:
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