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Need a "rock star" ColdFusion speaker for 7/30/2010 event in Dallas

Wed, 03 Mar 2010 17:24:55 GMT

Last year was the second annual Dallas TechFest, which is a 1-day multi-platform event centered around programming. They approached me at that time about bringing ColdFusion into the event, and giving us a dedicated track in one of the rooms. I made a optimistic claim that we could bring in 50+ CFML devs from the area, and low and behold, we ended up with 70+ people that registered with the discount code from our user group. It was very successful and had a good buzz with the local community. Additionally, we blew the PHP and Ruby groups out of the water! :)

For 2010, the organizers have offered a travel and expenses budget to to each track (CF being one of those) to pay for travel and expenses to get one "rock star" from each of the technologies. Based on last year's attendees, I would say that a large percentage were beginner-intermediate, with our regular core of advanced guys around as well. The event will be on Friday July 30, in Addison. Unfortunately this falls during the same week as CFUnited, which obviously zaps a number of speakers from the pool of availability, but if you are interested in speaking, please let me know! I am dshuck pretty much everywhere... gmail, twitter, facebook, etc.

UDF: pcase() - Captilize first letter of each word in a string

Thu, 25 Feb 2010 16:34:00 GMT

This is a UDF that I keep on hand for converting strings to "proper case", such as a person's name. For instance, in a database we might have a name stored like DAVID B. SHUCK, but when they log into our site and we welcome them, we don't necessarily want to shout it at them! Saying "Hello David B. Shuck..." would hopefully be a bit less abrasive.

Enter the user-defined function pcase(). Through the use of regular expressions we are doing a search for word patterns and capitalizing the first letter in each word. Enjoy!


<cffunction name="pcase" access="public" output="false"  returntype="string">
    <cfargument name="string"  type="string" required="true" />
    <cfreturn  REReplaceNoCase(LCase(arguments.string),"(^[a-z*]|[ *][a-z*])","\U\1\E","all")  />
</cffunction>

Implicit constructor and CF9 style implicit accessors without ColdFusion 9

Thu, 25 Feb 2010 11:56:00 GMT

One of the broadly welcomed features of ColdFusion 9 has been the addition of implicit getters and setters to CFCs. What this means is that you no longer have to hand code the repetitive boiler plate getXXX() and setXXX() methods for each property in your model objects. However, you don't need ColdFusion 9, (or even ColdFusion for that matter) to enjoy the benefits of the new implicit accessors with the version 9 release. Since ColdFusion 8, developers have had access to the OnMissingMethod() method which makes tasks like this very simple to implement on your own. The OnMissingMethod is also available in current versions of OpenBlueDragon and Railo.

For my implementation of this, I use a standard BaseBean class in a number of my projects which is extended by all of my model class objects. By leveraging the OnMissingMethod() in this BaseBean, I create these implicit accessors, in addition to an implicit constructor init() method as well.

There are multiple examples on the internet that show how you can use OnMissingMethod(), but for the most part, the examples that I have come across do not protect the class from being having infinite previously undefined properties added to it from the outside. For instance, I could have a class named Person.cfc with define properties of "firstName" and "lastName", but nothing would stop someone from doing Person.setThisIsNotAProperty(true) and that value would be dynamically added to the Person instance. While some might argue that the flexibility that this approach offers is a positive thing, I prefer to lock my classes down just a bit more. For instance I like the fact that I can open up a model class and see exactly what properties it can contain with clearly defined <cfproperty/> tags. From a maintainability standpoint the idea of "mystery" dynamic properties strike me as just wrong.

For my implicit constructor, I take an approach where I loop through any named arguments that were passed, and if the name matches a property that I have defined with <cfproperty/>, then it will be passed to a setter method. Any arguments that are passed that are not defined as a property are discarded.

So let's take a look at what this looks like. First I will paste the entire BaseBean, and below we will break it apart to discuss what is going on.

<cfcomponent output="false">       <cffunction name="init" access="public" output="false" returntype="BaseBean">   <cfset var i = "" />   <cfset initializePropertyList() />   <cfloop list="#this.propertyList#" index="i">    <cfif StructKeyExists(arguments,i)>     <cfset set(i,arguments[i]) />    </cfif>   </cfloop>     <cfreturn this />  </cffunction>      <cffunction name="initializePropertyList" access="private" output="false" returntype="void">   <cfset var i = "" />   <cfif NOT StructKeyExists(this,"propertyList")>    <cfset this.propertyList = "" />    <cfif ArrayLen(GetMetadata(this).properties)>     <cfloop from="1" to="#ArrayLen(GetMetadata(this).properties)#" index="i">      <cfset this.propertyList = ListAppend(this.propertyList,GetMetadata(this).properties[i].name)>     </cfloop>    </cfif>   </cfif>     <cfreturn />   </cffunction>      <cffunction name="onMissingMethod" access="public" output="false" returntype="any">   <cfargument name="missingMethodName" type="string" required="true" />   <cfargument name="missingMethodArguments" type="struct" required="true" />      <cfset var property = "" />            <cfif ReFindNoCase("^[gs](et)",arguments.missingMethodName)>    <cfset property = ReReplaceNoCase(arguments.missingMethodName,"^[gs](et)","") />    <cfset initializePropertyList() />     <cfif ListFindNoCase(this.propertyList,property)>     <cfif StructIsEmpty(arguments.missingMethodArguments)>      <cfreturn get(property) />     <cfelse>      <cfset set(property,arguments.missingMethodArguments[1]) />      <cfreturn this />     </cfif>     <cfelse>     <cfthrow message="The class #GetMetadata(this).name# does not have a property named #property# so the implicit #arguments.missingMethodName#() method is not available." />      </cfif>    </cfif>    <cfreturn />   </cffunction>    <cffunction name="get" access="public" output="false" returntype="any">   <cfargument name="property" type="string" required="true" />   <cfset var value = "" />        <cfset value = variables[arguments.property] />       <cfreturn value />   </cffunction>    <cffunction name="set" access="public" output="false" returntype="void">   <cfargument name="property" type="string" required="true" />   <cfargument name="value" type="any" required="true" />      <cfset variables[arguments.property] = arguments.value />      <cfreturn />  </cffunction>   </cfcomponent>

Before we walk through the actual flow, I would like to point out the method initializePropertyList() that you see here:

<cffunction name="initializePropertyList" access="private" output="false" returntype="void">  <cfset var i = "" />  <cfif NOT StructKeyExists(this,"propertyList")>   <cfset this.propertyList = "" />   <cfif ArrayLen(GetMetadata(this).properties)>    <cfloop from="1" to="#ArrayLen(GetMetadata(this).properties)#" index="i">     <cfset this.propertyList = ListAppend(this.propertyList,GetMetadata(this).properties[i].name)>    </cfloop>   </cfif>  </cfif>    <cfreturn />  </cffunction>

By using the GetMetadata() function, we are able to introspect our instance and create a list of property names which we can reference in our other methods. This is what enables us to enforce the rules that I described above in which we make sure that a property exists before setting it in the constructor or through an implicit accessor. You will see in both the init() and OnMissingMethod() methods that we call this method to ensure the list of properties is available before testing against it.

With that established, let's take a look at the init() constructor method:

<cffunction name="init" access="public" output="false" returntype="BaseBean">  <cfset var i = "" />  <cfset initializePropertyList() />  <cfloop list="#this.propertyList#" index="i">   <cfif StructKeyExists(arguments,i)>    <cfset set(i,arguments[i]) />   </cfif>  </cfloop>    <cfreturn this /> </cffunction>

After making sure that our propertyList has been initialized, we loop through that list and if there is a matching named argument, we call the set() method which sets that value into the variables scope.

So with the object initialized, let's take a look at our accessors. For our example, let's say that we have a Person object and we are doing to set our firstName property like this: person.setFirstName("Dave"). Since that setter method doesn't exist in our Person class, the OnMissingMethod() below will be invoked.

<cffunction name="onMissingMethod" access="public" output="false" returntype="any">  <cfargument name="missingMethodName" type="string" required="true" />  <cfargument name="missingMethodArguments" type="struct" required="true" />    <cfset var property = "" />          <cfif ReFindNoCase("^[gs](et)",arguments.missingMethodName)>   <cfset property = ReReplaceNoCase(arguments.missingMethodName,"^[gs](et)","") />   <cfset initializePropertyList() />    <cfif ListFindNoCase(this.propertyList,property)>    <cfif StructIsEmpty(arguments.missingMethodArguments)>     <cfreturn get(property) />    <cfelse>     <cfset set(property,arguments.missingMethodArguments[1]) />     <cfreturn this />    </cfif>    <cfelse>    <cfthrow message="The class #GetMetadata(this).name# does not have a property named #property# so the implicit #arguments.missingMethodName#() method is not available." />     </cfif>   </cfif>   <cfreturn />  </cffunction>

We are then doing a regular expression test to see if the missing method names starts with either "get" or "set". If so, we derive the name of the target property by stripping the "get" or "set" off of the string. After making sure that our propertyList has been defined, we then look in that list to see if the target property actually exists in the instance. If it does, the request is then routed on to either the getter or the setter depending on whether arguments were passed to it. Otherwise an exception will be thrown to let the developer know that he or she has attempted to access an undefined property.

One thing you might notice is that when our conditional block routes the request to the setter, we return an instance of the class itself. This allows us to do method chaining like this: person.setFirstName("Dave").setLastName("Shuck"). it should be noted that this is not the approach that Adobe took with ColdFusion 9.

So let's take a look at it in action. Here is our Person.cfc class.

<cfcomponent output="false" extends="BaseBean">    <cfproperty name="id" type="string" />  <cfproperty name="firstName" type="string" />  <cfproperty name="lastName" type="string" />   </cfcomponent>

As you can see in the <cfcomponent/> tag, we are extending our BaseBean which is all that we need to have a workable domain class object.

When we put this together and access it in our code, we can do this:

<cfset person = CreateObject("component","Person").init(id=7,firstName="Dave", lastName="Shuck") />  <cfdump var="#person#" />

Once we have an instance, we can modify those properties like so:

<cfset person.setId(8).setFirstName("Johnny").setLastName("Rotten") />

I have not actually tested this on Railo, but I can confirm that it works in OpenBlueDragon (including GAE version), and ColdFusion versions 8 and 9.

Link to the HFDP 4 CF Connect recordings

Wed, 10 Feb 2010 03:00:15 GMT

I have been asked more times than I would like to admit to put together a list of the meeting recordings that we have archived for our "Head First Design Patterns for ColdFusion Developers" series that the DFWCFUG has been doing since September of last year. I will be appending to that entry in the next couple of months as we near the end, so you may want to bookmark it for future reference if you are interested in following.

The entire archive can be found here.

Remaking Prodigy's Smack My B**** Up using Ableton

Thu, 17 Dec 2009 12:53:23 GMT

Very cool video showing a producer named Jim Pavloff re-creating this Prodigy classic using Ableton music production software, bringing in the samples one at a time and modifying them eventually building the entire track. I need me some Ableton! .... and some talent. :(

Making Prodigy's "Smack My Bitch Up" in Ableton by Jim Pavloff

Naked Domains in Google App Engine with GoDaddy

Thu, 17 Dec 2009 03:11:47 GMT

I recently set up a new site (hikethecanyon.org) on the Google App Engine running OpenBlueDragon. By default when you set up a new site on GAE (Google App Engine), you choose an ID for your application, which must be unique on their system as it also serves as the hostname of the URL like this: http://[your ID].appspot.com. For those that would like to use a different domain name, Google App Engine has mechanisms for doing so. In the administration panel of your application, you can add a domain and then choose hostnames from that domain that the application should respond to. However, it makes no provisions for serving the "naked domain".

What does this mean? For my example of hikethecanyon.org, I originally set the site up with an id of hikethecanyon-org which was initially served as http://hikethecanyon-org.appspot.com. After adding the domain hikethecanyon.org, I was able to add the host "www" so that it would respond to http://www.hikethecanyon.org. However, since GAE doesn't support naked domains, I was unable to set it up to respond to http://hikethecanyon.org. I was able find a workaround using GoDaddy's domain forwarding functionality. While walking fellow CFML developer Paul Kukiel through the process today, he mentioned that someone should blog this, so here it is with screenshots along the way (edit - it appears that he decided to blog it himself as well!)

For my example, I am going to use a domain I have had sitting around doing nothing for a few years (j4n.org) and walk through the process with some screenshots and explanations along the way.

First, you need to create your application in the GAE dashboard and deploy your application. Many people have covered this topic in our community including Paul Kukiel and Aaron Lynch, so I will skip to the next step and assume that you have a running application on Google App Engine. As you can see below, I have set up an app with an ID of j4n-org that is answering on http://j4n-org.appspot.com which is just running a Mach-II skeleton application.

The next thing that we want to do is add the j4n.org domain to this application. When you go into the GAE dashboard, you will see that option under the "Application Settings" section labeled "Domain Setup"

On this page you will see a note that tells you that the domain you add must be set up for Google Apps, a service that allows all sorts of functionality, including email services and more. NOTE: You do not have to use any of those services, you simply need to sign up!

By clicking the link that says Sign up for Google Apps, you will be taken to a page like this:

Walk through the process filling out your personal information and you will come to a screen that looks like this:

For our example, we are going to choose to create a new CNAME record in DNS to prove to Google that we own the domain. By choosing that option

At this point we need to go to the GoDaddy DNS manager and create a host name google46353a9a2d07a035 and point it to google.com. You can see what that looks like below:

Once that record is in place we can go back to the Google Apps page and click the button labeled I've completed the steps above. If all goes well, you will see a page directing you through additional setup. For our purposes in this example, we are done with Google Apps for the time being. Now we want to go back to the GAE dashboard and tell it that we want to use the j4n.org domain.

When you enter that domain you should see a message that looks like this:

This will bring us back into the Google Apps control panel for the j4n.org domain and we can add hostnames to our application like this:

When you click add you will see an page like the one below instructing you to add another CNAME to GoDaddy for the host "www".

In the screen below you will see that we have successfully added the "www" host and while we were in there I went ahead and deleted the temporary CNAME that we had to create earlier to validate the ownership of the domain.

At this point we can actually reach our application with the address http://www.j4n.org as you see below:

While this is pretty cool and all, we still can't access our application with http://j4n.org. For this, we will count on GoDaddy to do the rest. Go back into the GoDaddy domain manager look for this link:

On the next page, you will want to fill out the field like you see before. However, before you do, click the "learn more" link in the bottom left corner. On that page there is a very important note: For your domain to forward, your domain's A record must be 64.202.189.170. If you note my DNS information above, that is not what the default parked domain IP is. I won't bore you with yet another screen shot, but make sure you alter your domain's A record. Now when we ping j4n.org we get a response from 64.202.189.170.

Once we enter in www.j4n.org you can see that our plan is going to work by hitting the "Preview" link to the right and seeing a snapshot of our app!

You will notice that we accepted the default settings which actually does a 301 redirect from http://j4n.org to http://www.j4n.org. This means that we will never actually see http://j4n.org in the address bar after the page has loaded. If you click on the advanced settings you can select "masking" which allows the url to remain in the address bar as http://j4n.org. Each option has its own advantages. Select what is right for your application and choose OK.

That is all you need to do! Now, a word of warning... we have all gotten spoiled by the seemingly instant DNS changes in recent years. You will find that when you make this forwarding change, you may need to wait up to half an hour or so before you can see the finished product (your mileage may vary).

Relaunched HikeTheCanyon.org on OpenBD and GAE

Tue, 15 Dec 2009 16:44:05 GMT

Around a year or so ago, I inadvertently took hikethecanyon.org offline in a server move. Considering that it is a very low traffic site that is little more than a scrapbook of hiking pictures and descriptions, there is no active user community to send me nasty messages begging for me to bring it back online. Finally this past weekend, I spent a bit of time and revived the code base off an old server, moved all the images out to Amazon S3 and brought the site up running under OpenBlueDragon on the Google App Engine. Other than a very rudimentary Lightbox drop-in I did on the gallery to replace a no-longer functioning Flash image gallery, I didn't actually touch the codebase or the design. So if it looks dated to you, that is because it is!

For those interested in hiking, you may want to give it a look. It documents a hike of the Grand Canyon that I took with my dad in 2005 with a very detailed trip report and over 300 pictures. Enjoy!

HikeTheCanyon.org - Rim-to-Rim through the Grand Canyon on North Kaibab and the Bright Angel Trail

Setting up ColdSpring AOP and interesting behavior with return types

Mon, 07 Dec 2009 15:00:07 GMT

This weekend I had a task in which I needed to add a behavior onto a method in an existing production method in a service object. The new behavior is more or less notifying a 3rd party application whenever a particular method was being called. Considering that it is not really an essential part of the process, it didn't really belong inline as part of that method, nor did I really want to affect existing "sealed" production code. Although I understood that the AOP functionality of ColdSpring was designed for exactly that type of work, I had never actually used it before this task. I put together a little proof-of-concept application that validated what I wanted to do, then applied it to my application.

My goal was to set up an "afterReturningAdvice" object/method - that being a method which will be called at the completion of the target method, which is Member.saveMember() - where I could externalize the new behavior without touching the service itself. While I did get it to perform essentially how I expected, there were a couple of gotchas about this process. One of which makes good sense, the other... not so much.

For starters, my MemberService was defined in ColdSpring like this...
[codeblock 450]

In order to make this change without causing broad sweeping changes throughout the application (in theory!), we are going to create a proxy object that masquerades as the MemberService that will pass requests onto the original MemberService.
[codeblock 451]

As you can see, our MemberService is now actually of type coldspring.aop.framework.ProxyFactoryBean. We have defined its target as a bean named MemberServiceTarget which points to our original MemberService that has been renamed. it now has an "interceptors" property that basically wires in a new bean named RecordUpdatedMemberAfterReturningAdvisor that will serve as an interceptor anytime the "MemberService" is accessed.

So lets take a look at our interceptor definition:
[codeblock 452]

You can see that theRecordUpdatedMemberAfterReturningAdvisor that we declared in our previous snippet is defined here as type coldspring.aop.support.NamedMethodPointcutAdvisor, which is a another built-in type in the ColdSpring framework. We have defined a property "mappedNames" which will list any methods in our target object that we would like this interceptor to act on. In our case we are only wanting to act on the saveMember() method, which you see in the property. The "advice" property tells the interceptor that whenever our saveMember() method is called, that we need to notify our RecordUpdatedMemberAfterReturningAdvice. This is an object at we create that extends the coldspring.aop.AfterReturningAdvice abstract class that is included with the framework. When you use this advice, you must have a concrete implementation of the afterReturning() method, which is were we will actually put our code that notifies the 3rd party application. That method will contain the arguments: returnVal, method, args, and target, which will let you know all about the target method that was just called. Pretty cool huh?

Here is what that RecordUpdatedMemberAfterReturningAdvice looks like:
[codeblock 453]

You can see that our required afterReturning() method is what finally does the work that we were trying to implement. And all of this with no changes to our original application!

Well.... not exactly.

While this is certainly a pretty low impact change to our application, the idea that it would not affect any existing code wasn't the actual reality for a couple of reasons.

MemberService is no longer a MemberService! In about eleventy thousand places in my application, I had services that were wired with a dependency of our MemberService. Each of these had a getter/setter that looked something like this:
[codeblock 454]

With the changes that we have implemented, our MemberService is a completely different animal! Every single one of my getters and setters failed since my MemberService is now actually of type coldspring.aop.framework.ProxyFactoryBean. I altered them all to have type "any" (in case I remove this AOP piece later!) and all works. I suppose it is a worthwhile change, but it would be nicer if this change was truly transparent to my application.
This one is the head scratcher, and as of the time of this blog posting I have no explanation whatsoever.... but a Member isn't always a Member?!? In my MemberService, I have a getMember() method which returns a type my.objects.Member. In my initial testing I had no problems with this at all. However, once I rolled it into production, there was a process that called the MemberService.getMember() method that I had not hit in my initial tests. When it was called I received the following exception:

Message:The value returned from function fnct_
673EC50CBDBD5294E06289EE40D44ABE() is not of type Member
Our proxy MemberService creates a dynamic method that forwards requests onto the original target getMember() method. For whatever reason, in this one case, it was unable to validate that the returned object was indeed a Member. I modified my original MemberService to make the returntype of getMember() "any" an all is now working well. If anyone has an explanation for that one I am all ears!

Aside from those two issues, my new AOP functionality is now in production and working exactly as I had hoped. Overall, I think that this is a very cool feature of ColdSpring, and one that I will definitely be making more use of moving forward.

Create SSL sites in Apache on Windows with OpenSSL

Fri, 13 Nov 2009 03:47:33 GMT

To get a secure SSL site up and running on Apache under Windows, there are a few hoops to jump through that are not very intuitive. To that end, I am going to document my approach to setting up SSL using OpenSSL. This approach assumes that you already have Apache up and running on your machine, so if you have not done that, head over to the HTTPD download page and set that up before continuing.

Setting up OpenSSL
First we need to get OpenSSL setup on our system, which is not included with the Apache Windows binaries. In fact the OpenSSL project doesn't even provide the binaries themselves, but you can find them at Shining Light Productions. For this example, I will be choosing the Win32 OpenSSL v0.9.8k Light version. If you see a message like the one below, you will need to install the Microsoft Visual C++ 2008 Redistributable Package and then attempt the OpenSSL installation again.

Once you have it installed, you can do a quick test to make sure that it is set up properly:
Creating Certificates
Next, we will use the OpenSSL terminal interface to create our self-signed certificates. To explain a bit about what is going on below, I have a site already existing on my system that can be reached at http://scribble. What we are doing is creating a secure subdomain of https://secure.scribble. Typically when I create certificates, I name the files with the host/domain obvious so that they can be easily identified later. Obviously you will want to replace the domain name to match your setup, but type the following in the terminal in the OpenSSL/bin directory:

[codeblock 433]

That will generate what you see below.

You may notice that I left a lot of the prompts blank. Considering this is a dummy certificate in a development environment, that approach makes sense. You may choose to be more explicit based on your needs.

If we were to use this key as it is, we would be prompted for the password every time that Apache starts. Since that is less than ideal, we will now generate a non-protected key from the one we created in the previous step by typing the following:

[codeblock 434]

You can see that I was prompted for a pass phrase. This is the same password that you created when we generated the certificate above.

Now we need to need to build the certificate that we will actually import into Apache. You can do so by typing:

[codeblock 435]

This will result in the following output:

You can see that we now have a .cert, .csr, .key, and .pem file for our domain. We will use a combination of the .key and the .cert
Configuring Apache
Now we need to make sure that your Apache server is ready to serve SSL requests.

First, let's put the .key and .cert files that we created above into a directory under Apache. In your "conf" directory, create a subdirectory named "ssl" and move secure.scribble.key and secure.scribble.cert into that new directory.

Next we need to make sure that the mod_ssl module is enabled. Open up the httpd.conf file for your Apache webserver. Search for "mod_ssl" and you should find a line that looks like this:

Yours will likely be commented out with a '#' sign in front of the line. You will want to delete that '#' so that it looks like the highlighted line above.

Next you will need to make sure that you have uncommented the line that includes the httpd-ssl.conf file like you see below:

The last thing we need to do is configure our site. Open up the conf/extra/httpd-ssl.conf file in an editor. You will see that there is an amazingly huge and complex site definition in there already that starts with and ends about 150 lines later with . We need to disable this site. If you are feeling bold, you can simply delete it. However, I take the approach of commenting it out entirely so that I still have it as a reference, which is my recommendation as well. Starting with the line , put a '#' at the start of every line that doesn't already have one and continue until you comment out the line.

Now it is finally time for us to create the site definition for our https://secure.scribble site. We will use some of the concepts in the example, but eliminate most of them. Here is what mine looks like after paring down all the excess:
[codeblock 436]

In that code you can see where we are pointing to the .key and .cert files that we created above.

Now, restart your Apache server and you are now serving up securely!

Talking through some current issues with ColdFusion Event Gateways

Mon, 09 Nov 2009 16:28:07 GMT

Normally on my blog I attempt to throw out some tip, trick, or nugget of some sort. This time? Not so! I am currently trying to find a solution to a problem at hand and am brainstorming the best way to handle a few things. I am really just talking this out for my own benefit, but I would love to hear thoughts from others that have perhaps solved similar issues.

On a project that I am currently engaged in I am leveraging ColdFusion Event Gateways which work as a subscriber to a SonicMQ JMS server. My gateway instance listens for messages on the ESB (Enterprise Service Bus) on a particular destination name (topic/queue). When it receives a message, it parses the XML that it received, and plays traffic cop pushing data into various services that need it. I have this working flawlessly in my small development environment. However, I have a couple of complexities ahead of me that I am having difficulty coming up with a good solution.

Running in the cloud - Our production environment will have any number of CF instances, not clustered, but rather running as isolated applications with a load balancer directing the requests using sticky sessions. Our system will be bringing new instances on/off line as traffic traffic dictates. I have yet to solve the issue of how to set up my JMS Event Gateway in this environment. I definitely don't want 20 different listeners out there all doing the same work. I have considered the idea of having some sort of a support database where a listener can insert a row with a specific JMS message ID and when any other server picks up a message with that ID it will see that it is already being acted upon and it can safely ignore it. There are a couple of negatives that I can see right off the bat. First is that every single subscribed instance will have to pull in the same message and test to see whether or not it should be acted upon. It just seems like a little bit of redundancy that shouldn't be there. Secondly, there is a chance that two servers could pick up the same request within milliseconds of each other and both could end up doing the work. Duplicate processing could not only be wasteful, but could also create some data integrity issues.
Different environments have different settings (dynamic config) - Right now in our development phase, we have a single config file with setting specific to our development JMS server (credentials, domain, URL, Initial Context Factory, etc). However, soon I will need to have this process support a number of different environments: multiple dev environments, multiple integration environments, multiple QA environments, and eventually production. Ideally it would be wonderful if I could find some way to load a specific config into the event gateway at server init time, but as of today I have _NO_ idea how to solve this one. First, there is no real intrinsic indicator at the server level that lets it know what environment is currently running (yet anyway...) and secondly, ColdFusion event gateway architecture isn't conducive in any way to dynamically loading a specific config.

So now I am counting on you CFML community. Help me brain storm on this! Do you have any thoughts/ideas that might help me here?

A linux guy's experience with Windows 7

Mon, 19 Oct 2009 13:58:00 GMT

Anyone who knows me well knows that I am typically somewhat of an anti-Windows guy. I absolutely love linux, and get very frustrated by Windows in general. The only thing that I really dislike about linux is the lack of application support by a number of companies (ahem…. Adobe). Before going to the Adobe MAX conference, I decided I should swap out OSes on my personal laptop so that I could run all the stuff I would need for labs without constantly cursing about being stuck in a VM, limited functionality, etc. A friend had just bought a package of Windows 7 licenses and sold me one for 5 bucks, which I considered to be a pretty reasonable risk. I opted for installing Windows 7 on my laptop.

Given that background and my previous feelings about Windows, I have to say that it is a pretty dang nice operating system. It is by far the best offering to date by MS in my opinion. There are a few things that they still haven't managed to get right (native file copy still makes me want to stick forks in my eyes), but by and large they have done a great job with Windows 7. Other than having to track down a few drivers for my laptop, the installation was painless – if not fast. This is still an area that linux, and especially Ubuntu, wins hands down though. Apps run extremely stable, and with the addition of a new concept of "Libraries", directories that I need access to regularly are right at hand instead of having to tree down through big hierarchies. I am also not finding what I expected would be an immediate degradation of performance after installing all the servers and development tools that I use on a daily basis. Over all, so far so good.

A few things that I think are a *must* for the way that I use it.

I found a "sudo" program called Start++ that allows me to open applications from the terminal or start menu as Administrator by typing sudo notepad [or some other program]. It will prompt you for the UAC stuff and the program will open as administrator. I use this regularly for editing system files like hosts, apache configs, and use it to open a terminal to fire off j2ee servers.
Install Teracopy which is a replacement for the Windows copy program. While certainly not as fast/efficient as a linux terminal, it greatly increases file copy speed over the native windows GUI file copy. No more "preparing to copy" waits while your system bogs down.

Things that annoy me

I still wish I could have a real terminal and be able to use VI in sudo, but that is just something I will have to get over I guess.
I hate that I now have to be so careful with regard to viruses and spyware. I love the protection that linux offers in that area, and having to go out of my to stay protected seems a bit cumbersome.
I miss being able to easily try out software with the ease of the synaptic package manager. It seems foreign now to have to download an exe run an installer and have settings being obscurely written all over a "black box" registry.
I miss built-in networking tools. Even simply things like being able to run "whois" from the teminal.
My drive is getting fragmented far faster than with linux, and I find that I am running the defrag tool fairly often. Linux just manages this under the covers and I never have to worry about it.

All said, after using it for about the past 4 weeks, I can honestly say that I am surprised (and perhaps even a bit disappointed) that I like it as much as I do. I planned on just running it while I was at the Adobe MAX conference and going back to linux when I got home, but it looks like I will be keeping it for a while longer.

Strange behavior with ColdFusion ExpandPath() when using Symbolic Links

Wed, 23 Sep 2009 14:11:00 GMT

I was playing around with the Quicksilver framework last night, and for some reason it was unable to find and instantiate my CFCs properly. After digging into the framework a bit and determining where it was breaking, I discovered something strange about the way that ColdFusion interprets ExpandPath() when it exists in a directory that is defined as a symbolic link. I am not sure if the same behavior exists on Macs, but I would imagine it does. If someone could confirm that to be the case, I would be interested.

For starters, I usually have a 'www' directory in my user home directory. This way when I pass my user profile around from distro to distro, my development work is included in my home directory. For ease of configuration I typically have a symbolic link in my OS that points /www/ ---> /home/dshuck/www/. Then when I am creating a new web project called 'davescode', I would put it in /home/dshuck/www/davescode, but my Apache config would usually point to /www/davescode. For the past several years, this approach has worked will for me. That is until last night when experimenting with Quicksilver.

When Quicksilver loads, it creates a list of service CFCs in the the application in such a way that if I had Foo.cfc in a directory 'com' in the root of my davescode site, it would look like /home/dshuck/www/davescode/com/Foo.cfc. When I initted the application, I was getting an error that it couldn't find the CFC home/dshuckcom/Foo.cfc. Essentially what was happening is that it was getting the full path of the CFC and replacing the path to the root of the site with "". In a perfect world the value of the path after the string replace would have looked like com/Foo.cfc. Unfortunately that was not so. Here's why!

I put a test file called path.cfm in the root of my davescode site that considted of the following:

<cfoutput>#ExpandPath("./")#</cfoutput> <br/> <cfoutput>#ExpandPath("/")#</cfoutput>

The result was very surprising!

/home/dshuck/www/davescode/ /www/davescode/

For some reason when you do ExpandPath("/") it looks at the symbolic link path, but when you do ExpandPath("./"), it looks at the true file path. For the life of me, I can't think of why that would be. If anyone has an explanation, I would be all ears!

Usability - It's not just for websites!

Mon, 02 Jul 2007 12:55:26 GMT

As a web developer, usability is something that we consider on a daily basis. When it comes to functionality that has become a standard, we don't jack with it! For instance, we have long established that when you mouseover a link the cursor turns into a pointy finger. Can we alter that? Sure! But people would be confused and would likely miss some content in your application. See that navigation bar at the top of my page? I could easily move to align with the bottom of my site, but the result would lead to more confusion.

This leads me to a mini-rant about my new phone. A couple weeks ago I dropped my LG phone one too many times. It seemed to always think I had a headset plugged in, although I have never actually owned a phone headset. In addition, when I turned it on, it would randomly call my Mom and Dad. That one I still can't figure out!

So, being a generally cheap guy, I stopped by the Cingular store to pick up the the next-to-the-bottom-line model for about 60 bucks and was on my way without paying too much attention. After unwrapping it and charging for the first time, I discovered something that baffles me. Check out this keypad!

What genius thought it would be a good idea to design the keys like that? After about 35 years of a consistent and well-defined pattern of telephone keypads, Sony/Ericsson decided it would be a good idea to alter that by offsetting the middle column. This serves no functional purpose either. You can see they could have quite easily shifted the middle column of buttons up so that they would be aligned. I am sure my fingers will get used to it, but dialing without looking at my fingers presents a new challenge. I suppose that is one of the costs of being cheap. :)

Cyber attack us eh? How about a counter attack IRL!

Thu, 08 Feb 2007 20:25:59 GMT

This is pretty interesting, especially in light of this week's rampant DoS attacks. From the article:

If the United States found itself under a major cyberattack aimed at undermining the nation’s critical information infrastructure, the Department of Defense is prepared, based on the authority of the president, to launch a cyber counterattack or an actual bombing of an attack source.

Apparently if the nation's networks come under a severe attack, there is a group called the National Cyber Response Coordination Group (NCRCG) that is responsible for coordinating a defense/retaliation strategy. Members of the NCRCG include experts from the US-CERT computer-readiness team, the Department of Justice and the Defense Department. They are actually playing out "war games" in order to prepare for an attack. Where it gets especially interesting to me is the fact that the strategy potentially could include a physical bombing attack. I am certainly glad to see them protecting my career as an internet developer! :)

Read the complete article...

ps. Make sure you keep those Windows Updates current We sure would miss you if your computer was commandeered and was preforming an attack from your house!

Cool video showing an iPhone in action - and a question to web developers

Wed, 31 Jan 2007 16:50:43 GMT

I have been kind of passively watching the iPhone news go by the past month knowing I am far too cheap to actually buy one until they are no longer cool and people have moved on to the next flash in the pan at which point I will be stuck with the old and busted iPhone.

This morning a coworker sent me this video demonstrating the features. There is some really sweet stuff in there! As I watched it I could hear a future conversation my kids will be having their kids.

"Son, when I was a little boy we had these big noisy metal boxes under our desks and *those* were our computers. Can you believe that?"

So to the web development community -- What do you think we need to be doing today in order to be prepared for the future in such a way that we remain viable as developers? I don't want to end up staring at the same fate as client-server Windows application developers, watching my corner of the development world get smaller and smaller!

Does it really change much for us? What what should we be learning now?

[youtube YgW7or1TuFk]

Grand Canyon... It's on!

Mon, 11 Jul 2005 05:00:00 GMT

My father and I decided that this was the year that we would hike the North Rim to the South Rim of the Grand Canyon. I know this seems crazy, but it is actually a paperwork challenge to be able to hike the Grand Canyon. There is an application process in which you have to fax your request in the 1st day of the month 6 months before the intended date of your trip with a detailed itinerary, including where you will be sleeping and when. We sent faxed our paperwork in and held our breath on the 1st of April, 6 months before we hoped to go in September. After no word for a month we finally contacted them, only to find out that we had been rejected. Discouraged, but not beaten, we laid out the calendar to see if there was another time that would work. We decided that November would be acceptable, albeit a little colder. It should be in the 60s in the bottom of the canyon though where we will spend the majority of our time. Once again, we laid out our itinerary and faxed in on July 1. My dad received a letter today dated July 6, 2005 telling him that they were sorry, but they were unable to accept out application. He spent a good hour walking around the house cussing and feeling terribly disappointed. A bit later my mom noticed there was another letter from the Grand Canyon dated July 7, 2005.

Dear Mr. Shuck, we have accepted your request to hike the Grand Canyon on the dates of November 1, 2 and 3, 2005. Enlcosed are your passes, which you will need to affix to your backpack and carry with you in the canyon. There is no need to stop by the back country headquarters before departing on the trail.

So in 3.5 months, I will be taking this in....