CommandBox : CLI, Package Manager, REPL & More
4.6.0
4.6.0
  • Introduction
  • About This Book
  • Authors
  • Overview
  • Getting Started Guide
  • Setup
    • Requirements
    • Download
    • Installation
    • Non-Oracle JREs
    • Upgrading
    • Common Errors
  • Usage
    • Execution
      • Recipes
      • CFML Files
        • Using a DB in CFML scripts
      • OS Binaries
      • CFML Functions
      • Exit Codes
    • Commands
    • Parameters
      • Escaping Special Characters
      • File Paths
      • Globbing Patterns
      • Piping into Commands
      • Expressions
    • Command Help
    • Environment Variables
    • System Settings
    • Ad-hoc Command Aliases
    • Default Command Parameters
    • REPL
    • Tab Completion
    • Interactive Shell Features
    • forEach Command
    • Auto Update Checks
    • Bullet Train Prompt
    • 256 Color Support
    • A Little Fun
  • IDE Integrations
    • Sublime Text
    • Visual Studio Code
  • Config Settings
    • Module Settings
    • Proxy Settings
    • Endpoint Settings
    • Server Settings
    • Misc Settings
  • Embedded Server
    • Multi-Engine Support
    • Offline Server Starts
    • Debugging Server Starts
    • Server Processes
    • Manage Servers
    • FusionReactor
    • Server Logs
    • Configuring Your Server
      • JVM Args
      • Server Port and Host
      • URL Rewrites
      • Aliases
      • Custom Error Pages
      • Welcome Files
      • Basic Authentication
      • Custom Java Version
      • Adding Custom Libs
      • GZip Compression
      • REST Servlet
    • External Web Server
    • Starting as a Service
    • Server.json
      • Working with server.json
      • Packaging Your Server
      • Using Multiple server.json Files
  • Package Management
    • Installing Packages
      • Installation Path
      • Installation Options
      • Advanced Installation
    • Private Packages
    • System Modules
    • Code Endpoints
      • ForgeBox
      • HTTP(S)
      • File
      • Folder
      • Git
      • Java
      • S3
      • CFLib
      • RIAForge
      • Jar (via HTTP)
      • Gist
    • Package Scripts
    • Dependencies
    • Updating Packages
    • Creating Packages
      • Editing Package Properties
      • Publishing Lucee Extensions to ForgeBox
    • Artifacts
    • Box.json
      • Basic Package Data
      • Extended Package Data
      • Package URLs
      • Installation
      • Embedded Server
      • Dependencies
      • TestBox
    • Managing Version
  • Task Runners
    • Task Anatomy
    • Task Target Dependencies
    • Passing Parameters
    • Using Parameters
    • Task Output
    • Task Interactivity
    • Shell Integration
    • Downloading Files
    • Running Other Commands
    • Error Handling
    • Hitting Your Database
    • Interactive Jobs
    • Watchers
    • Property Files
    • Running other Tasks
    • Loading Ad hoc Jars
    • Loading Ad-hoc Modules
    • Cancel Long Tasks
    • Progress Bar
  • Helpful Commands
    • Token Replacements
    • Checksums
    • Code Quality Tools
  • Deploying CommandBox
    • Docker
    • Heroku
  • TestBox Integration
    • Test Runner
    • Test Watcher
  • Developing For CommandBox
    • Modules
      • Installation and Locations
      • Configuration
        • Public Properties
        • Configure() Method
        • Lifecycle Methods
      • Conventions
      • User Settings
      • Linking Modules
    • Commands
      • Aliases
      • Using Parameters
        • Using File Globs
        • Dynamic Parameters
      • Command Output
      • Tab Completion & Help
      • Interactivity
      • Watchers
      • Shell integration
      • Running Other Commands
      • Error handling
      • Watchers
      • Loading Ad hoc Jars
    • Interceptors
      • Core Interception Points
        • CLI Lifecycle
        • Command Execution Lifecycle
        • Module Lifecycle
        • Server Lifecycle
        • Error Handling
        • Package Lifecycle
      • Custom Interception Points
    • Injection DSL
    • Example Project
  • ForgeBox Enterprise
    • Introduction
    • Storage
    • Commands
      • List
      • Register
      • Login
      • Set Default
      • Remove
    • Usage
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  1. Task Runners

Cancel Long Tasks

In CommandBox, a user can cancel a command or task by pressing Ctrl-C. This fires the interrupt handler in the terminal which calls Thread.interrupt() on the Java thread running in CLI. Java's interrupt doesn't kill a thread dead though, it politely asks it to wrap up what it's doing so it doesn't get messy. There are a number of built in CFML functions like sleep() that will automatically check and see if the thread they are executing in has been interrupted. A number of build in CommandBox functions like the print helper also check to see if the thread has been interrupted.

These method throw an InterruptedException which aborts the execution of your task and rolls back to the interactive command prompt. But what if your task is doing a lot of work and it doesn't realize it's been asked to stop? If your task does a very large amount of computations in a loop of some kind, you can periodically check if the user has tried to interrupt you by calling this built in method that is available to all custom commands and Task Runners.

checkInterrupted();

If the current thread hasn't been interrupted, that call will simply return immediately and you can continue with your work. If your thread has been interrupted, that call with throw an exception. No need to catch it-- the exception will automatically stop execution of your task and the CommandBox shell will catch the exception itself, output the text "CANCELLED" and return to the prompt.

If you do call this method from inside of a try/catch, you'll want to rethrow any interrupted exceptions. Also, if your work has any cleanup that must always be performed like closing a socket connection, make sure you use a finally {} block for those items.

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Last updated 6 years ago

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