Package me.tongfei.progressbar

Class TerminalUtils

java.lang.Object

me.tongfei.progressbar.TerminalUtils

public class TerminalUtils
extends java.lang.Object

Since:

0.9.0

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static java.util.Queue<ProgressBarConsumer>	activeConsumers
(package private) static char	CARRIAGE_RETURN
private static boolean	cursorMovementSupported
(package private) static int	DEFAULT_TERMINAL_WIDTH
(package private) static char	ESCAPE_CHAR
private static org.jline.terminal.Terminal	terminal

Constructor Summary

Constructors

Constructor	Description
TerminalUtils()

Method Summary

Modifier and Type	Method	Description
(package private) static void	closeTerminal()
(package private) static <T extends ProgressBarConsumer> java.util.stream.Stream<T>	filterActiveConsumers(java.lang.Class<T> clazz)
(package private) static org.jline.terminal.Terminal	getTerminal()	Creating terminal is relatively expensive, usually takes between 5-10ms.
(package private) static int	getTerminalWidth()
(package private) static boolean	hasCursorMovementSupport()
(package private) static java.lang.String	moveCursorDown(int count)
(package private) static java.lang.String	moveCursorUp(int count)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

CARRIAGE_RETURN

static final char CARRIAGE_RETURN

See Also:

Constant Field Values

ESCAPE_CHAR

static final char ESCAPE_CHAR

See Also:

Constant Field Values

DEFAULT_TERMINAL_WIDTH

static final int DEFAULT_TERMINAL_WIDTH

See Also:

Constant Field Values

terminal

private static org.jline.terminal.Terminal terminal

cursorMovementSupported

private static boolean cursorMovementSupported

activeConsumers

static java.util.Queue<ProgressBarConsumer> activeConsumers

Constructor Detail

TerminalUtils

public TerminalUtils()

Method Detail

getTerminalWidth

static int getTerminalWidth()

hasCursorMovementSupport

static boolean hasCursorMovementSupport()

closeTerminal

static void closeTerminal()

filterActiveConsumers

static <T extends ProgressBarConsumer> java.util.stream.Stream<T> filterActiveConsumers(java.lang.Class<T> clazz)

moveCursorUp

static java.lang.String moveCursorUp(int count)

moveCursorDown

static java.lang.String moveCursorDown(int count)

getTerminal

static org.jline.terminal.Terminal getTerminal()

• Creating terminal is relatively expensive, usually takes between 5-10ms.
  • If updateInterval is set under 10ms creating new terminal for on every re-render of progress bar could be a problem.
  • Especially when multiple progress bars are running in parallel.
• Another problem with Terminal is that once created you can create another instance (say from different thread), but this instance will be "dumb". Until previously created terminal will be closed.