Tag: eclipse

Set operations in ColdFusion

Today I needed to get all the elements in one list that were not members of a second list. That may ring a bell — it’s known as a set difference, or a relative complement.

Although it would have been simple to loop through first the list and add only the elements not present in the second list to a new list, I thought I would look around to see if anyone had already implemented set operations in ColdFusion, e.g. on cflib.org. I was surprised that I didn’t find anything, so I decided to create my own, as much as an exercise as anything, and posted it to Bitbucket:
arraySet: ColdFusion set operations

I included the following operations:

  • union
  • intersection
  • set difference
  • subset
  • equality
  • size

In the process, I experimented with MXUnit, a unit testing suite for ColdFusion that integrates with Eclipse. (I am currently taking a Scala programming course that emphasizes Test-Driven Development, or TDD, so I thought I should try it in CF as well.)

Since I was implementing sets using arrays as the underlying data structure, I also decided to use cfinterface to define a set interface, which arraySet implements. I had never used cfinterface before, and although its usefulness has been questioned, it seemed more appropriate than extending a base set class.

ANT deployment script and SFTP

My development team is moving away from developing on mapped drives/file shares to using cloud-hosted servers on Amazon Web Services (AWS). This is introducing a change to our usual workflow, as our access to the remote servers is limited to SSH and SFTP.

Although I previously used Apache Ant scripts through Eclipse to facilitate deploying application updates, the scripts were generally unpopular with the rest of the development team. (Many of them do not use Eclipse and preferred just to drop-and-drag files from their development sandboxes to the development or production servers.) Additionally, my original Ant scripts relied on the sync command to synchronize folders on the file shares.

Here is a revised Ant script that uses SCP (Secure Copy)–not SFTP but achieves the same goal–to deploy application files from a developer sandbox to the development or production server:

<project name="Deploy myapp" default="Sandbox to Dev">
  <input message="Username:" addproperty="username" />
  <input message="Password:" addproperty="passwd" />
  <property name="applicationFolder" value="myapp"/>
  <property name="site" value="osric.com"/>
  <property name="sandboxRoot" value="${basedir}"/>
  <property 
    name="development" 
    value="${username}:${passwd}@dev.osric.com:/home/web/${site}/${applicationFolder}"/>
  <property 
    name="production" 
    value="${username}:${passwd}@osric.com:/home/web/${site}/${applicationFolder}"/>
  <target name="Sandbox to Dev">
    <scp todir="${development}" trust="true">
      <fileset dir="${sandboxRoot}">
        <exclude name="**/build.xml"/>
        <exclude name="**/.*"/>
      </fileset>
    </scp>
  </target>
  <target name="Sandbox to Production">
    <scp todir="${production}" trust="true">
      <fileset dir="${sandboxRoot}">
        <exclude name="**/build.xml"/>
        <exclude name="**/.*"/>
      </fileset>
    </scp>
  </target>
</project>

There are a couple issues with this script to be aware of:

  • SCP is not included with Ant. The script produced the error “Problem: failed to create task or type scp”. I needed to:
    1. Download JSCH
    2. Place the file in Eclipse’s plugins/[ant folder]/lib folder
    3. Add the JAR file to the Ant build path (via Window–Preferences–Ant Home Entries (default)–Add External JARs…–select the jsch .jar file)
  • The password input is in plain text. Hiding password input in Ant provides a solution for Ant, but one that does not work from Eclipse. I have seen other possible solutions, so I’ll update this once I implement once and confirm that it works.