magic-progress

A java library for simple progress monitoring using animated progress bars on the console.

Installation

Add the following dependency to your Maven Project:

<dependency>
  <groupId>com.github.lukfor</groupId>
  <artifactId>magic-progress</artifactId>
  <version>0.3.2</version>
</dependency>

0r include it as a dependency in your Gradle project:

compile 'com.github.lukfor:magic-progress:0.3.2'

Run your first Task

First, implement the ITaskRunnable interface and put your code into the run method. You can use the provided ITaskMonitor to report progress:

• Use the begin(..) method to start a new task and to set the total amoumt of work

• Use the worked(..) method to notify the monitor about the progress.

• Finally, use done()

Example:

ITaskRunnable task = new ITaskRunnable() {

	@Override
	public void run(ITaskMonitor monitor) {

	monitor.begin("Task Name", 100);

		for (int i = 0; i < 100; i++) {
			monitor.worked(1);
			try {
				Thread.sleep(10);
			} catch (Exception e) {}
		}

		monitor.done();

	}
};

Next, use the TaskService API to execute the task:

TaskService.run(task);

Relax and enjoy the beautiful ANSI animation:

See Example.java.

Take Advantage of Built-In Tasks

magic-progress provides several built-in tasks to process files or collections in an easy and reusable way. The following examples demonstrate some of the most common use cases.

Iterators and Collections

Use the class AbstractCollectionTask to process collections or iterators. No manual progress notification is needed since everything is handled automatically by AbstractCollectionTask.

static class SumTask extends AbstractCollectionTask<Integer> {

		private int sum = 0;

		public SumTask(Vector<Integer> list) {
			super(list);
		}

		@Override
		public void process(Iterator<Integer> iterator) {
			while (iterator.hasNext()) {
				sum += iterator.next();
			}
		}

		public int getSum() {
			return sum;
		}

}

Create a new instance of the task an execute it using the TaskService API:

Vector<Integer> list = new Vector<Integer>();
for (int i = 0; i < 10000000; i++) {
	list.add(5);
}

SumTask task = new SumTask(list);
TaskService.run(task);

System.out.println("Sum: " + task.getSum());

Files and Downloads

String url = "http://speedtest.tele2.net/1GB.zip";
String file = "download.zip";

DownloadTask task = new DownloadTask(url, file);

TaskService.monitor(Components.DOWNLOAD).run(task);

Execute Multiple Tasks in Parallel

TaskService.setThreads(3);
TaskService.setFailureStrategy(TaskFailureStrategy.CANCEL_TASKS);

ITaskRunnable task1 = createTask("task1", 500, 100);
ITaskRunnable task2 = createTask("task2", 600, 200);
ITaskRunnable task3 = createTask("task3", 800, -1);

TaskService.monitor(SPINNER, TASK_NAME,  DEFAULT).run(task1, task2, task3);

TODO: submit at once, multiple worker threads, how to implement task cancellation, task failure strategies

Customizing the Appearance of the Progress Bar

Sometimes it can be necessary to customize the progress bar appearance. For example, you want to change labels/units or want adapt the style or layout of the bar it self. To enable full customization, magic-progress provides the possibility to combine different components like labels and bars to build complex and fancy animations.

Labels

Progress Bars and Spinners

Creating a Custom Component

Components themselves can be created by implementing the IProgressIndicator interface.

ANSI support

Out of the box, all progress bars are using ANSI colors to display beautiful and animated bars and print their content to stdout. However, if you prefer to print the bar to stderr or to disable colors, you can change the default behavior of TaskService with the following flags:

TaskService.setAnimated(false);
TaskService.setAnsiColors(true);
TaskService.setTarget(System.err);

Tip: Use this static methods and implement a --no-ansi flag and let the user decide to use it.

More examples

magic-progress can easily be combined with jbang and picocli. There are several examples available to get an overview about its key features and usage.

License

magic-progress is MIT Licensed.