Class ExternalTerminal
- All Implemented Interfaces:
Closeable
,Flushable
,AutoCloseable
,TerminalExt
,Terminal
The ExternalTerminal class provides a terminal implementation that is well-suited for supporting incoming external connections, such as those from network sources (telnet, SSH, or other protocols). It extends the LineDisciplineTerminal class, inheriting its line discipline functionality while adding features specific to external connection handling.
This terminal implementation starts consuming input in a separate thread to generate interruption events promptly, ensuring that signals like Ctrl+C are processed immediately rather than waiting for the application to read the input. This is particularly important for network-based terminals where latency could otherwise affect the responsiveness of signal handling.
Key features of this implementation include:
- Support for external connections over various protocols
- Prompt signal handling through background input processing
- Configurable terminal type and attributes
- Support for dynamic size changes
This terminal is commonly used in server applications that need to provide terminal access to remote clients, such as SSH servers, telnet servers, or custom network protocols that require terminal emulation.
- See Also:
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Nested Class Summary
Nested classes/interfaces inherited from interface org.jline.terminal.Terminal
Terminal.MouseTracking, Terminal.Signal, Terminal.SignalHandler
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected final AtomicBoolean
protected final Object
protected final InputStream
protected boolean
protected Thread
Fields inherited from class org.jline.terminal.impl.LineDisciplineTerminal
attributes, masterOutput, size, skipNextLf, slaveInput, slaveInputPipe, slaveOutput, slaveReader, slaveWriter
Fields inherited from class org.jline.terminal.impl.AbstractTerminal
bools, currentMouseTracking, encoding, handlers, ints, name, onClose, palette, status, stderrEncoding, stdinEncoding, stdoutEncoding, strings, type
Fields inherited from interface org.jline.terminal.Terminal
TYPE_DUMB, TYPE_DUMB_COLOR
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Constructor Summary
ConstructorsConstructorDescriptionExternalTerminal
(String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding) ExternalTerminal
(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Charset stdinEncoding, Charset stdoutEncoding, Charset stderrEncoding, Terminal.SignalHandler signalHandler) ExternalTerminal
(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Charset stdinEncoding, Charset stdoutEncoding, Charset stderrEncoding, Terminal.SignalHandler signalHandler, boolean paused) ExternalTerminal
(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Charset stdinEncoding, Charset stdoutEncoding, Charset stderrEncoding, Terminal.SignalHandler signalHandler, boolean paused, Attributes attributes, Size size) ExternalTerminal
(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Terminal.SignalHandler signalHandler) ExternalTerminal
(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Terminal.SignalHandler signalHandler, boolean paused) ExternalTerminal
(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Terminal.SignalHandler signalHandler, boolean paused, Attributes attributes, Size size) -
Method Summary
Modifier and TypeMethodDescriptionboolean
Whether this terminal supportsTerminal.pause()
andTerminal.resume()
calls.protected void
doClose()
getCursorPosition
(IntConsumer discarded) Query the terminal to report the cursor position.Returns the terminal provider that created this terminal.void
pause()
Temporarily stops reading the input stream.void
pause
(boolean wait) Stop reading the input stream and optionally wait for the underlying threads to finish.boolean
paused()
Check whether the terminal is currently reading the input stream or not.void
pump()
void
resume()
Resumes reading the input stream after it has been paused.Methods inherited from class org.jline.terminal.impl.LineDisciplineTerminal
doProcessInputByte, getAttributes, getSize, getSystemStream, input, output, processInputByte, processInputBytes, processInputBytes, processIOException, processOutputByte, raise, reader, setAttributes, setSize, writer
Methods inherited from class org.jline.terminal.impl.AbstractTerminal
checkInterrupted, close, echo, echo, echoSignal, encoding, enterRawMode, flush, getBooleanCapability, getCurrentMouseTracking, getDefaultBackgroundColor, getDefaultForegroundColor, getKind, getName, getNumericCapability, getPalette, getStatus, getStatus, getStringCapability, getType, handle, hasFocusSupport, hasMouseSupport, parseInfoCmp, puts, readMouseEvent, readMouseEvent, readMouseEvent, readMouseEvent, setOnClose, stderrEncoding, stdinEncoding, stdoutEncoding, toString, trackFocus, trackMouse
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface org.jline.terminal.Terminal
getBufferSize, getHeight, getWidth
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Field Details
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closed
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masterInput
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lock
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paused
protected boolean paused -
pumpThread
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Constructor Details
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ExternalTerminal
public ExternalTerminal(String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding) throws IOException - Throws:
IOException
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ExternalTerminal
public ExternalTerminal(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Terminal.SignalHandler signalHandler) throws IOException - Throws:
IOException
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ExternalTerminal
public ExternalTerminal(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Charset stdinEncoding, Charset stdoutEncoding, Charset stderrEncoding, Terminal.SignalHandler signalHandler) throws IOException - Throws:
IOException
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ExternalTerminal
public ExternalTerminal(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Terminal.SignalHandler signalHandler, boolean paused) throws IOException - Throws:
IOException
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ExternalTerminal
public ExternalTerminal(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Charset stdinEncoding, Charset stdoutEncoding, Charset stderrEncoding, Terminal.SignalHandler signalHandler, boolean paused) throws IOException - Throws:
IOException
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ExternalTerminal
public ExternalTerminal(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Terminal.SignalHandler signalHandler, boolean paused, Attributes attributes, Size size) throws IOException - Throws:
IOException
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ExternalTerminal
public ExternalTerminal(TerminalProvider provider, String name, String type, InputStream masterInput, OutputStream masterOutput, Charset encoding, Charset stdinEncoding, Charset stdoutEncoding, Charset stderrEncoding, Terminal.SignalHandler signalHandler, boolean paused, Attributes attributes, Size size) throws IOException - Throws:
IOException
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Method Details
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doClose
- Overrides:
doClose
in classLineDisciplineTerminal
- Throws:
IOException
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canPauseResume
public boolean canPauseResume()Description copied from interface:Terminal
Whether this terminal supportsTerminal.pause()
andTerminal.resume()
calls.- Specified by:
canPauseResume
in interfaceTerminal
- Overrides:
canPauseResume
in classAbstractTerminal
- Returns:
- whether this terminal supports
Terminal.pause()
andTerminal.resume()
calls. - See Also:
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pause
public void pause()Description copied from interface:Terminal
Temporarily stops reading the input stream.This method pauses the terminal's input processing, which can be useful when transferring control to a subprocess or when the terminal needs to be in a specific state for certain operations. While paused, the terminal will not process input or handle signals that would normally be triggered by special characters in the input stream.
This method returns immediately without waiting for the terminal to actually pause. To wait until the terminal has fully paused, use
Terminal.pause(boolean)
with a value oftrue
.Example usage:
Terminal terminal = TerminalBuilder.terminal(); // Pause terminal input processing before running a subprocess terminal.pause(); // Run subprocess that takes control of the terminal Process process = new ProcessBuilder("vim").inheritIO().start(); process.waitFor(); // Resume terminal input processing terminal.resume();
- Specified by:
pause
in interfaceTerminal
- Overrides:
pause
in classAbstractTerminal
- See Also:
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pause
Description copied from interface:Terminal
Stop reading the input stream and optionally wait for the underlying threads to finish.- Specified by:
pause
in interfaceTerminal
- Overrides:
pause
in classAbstractTerminal
- Parameters:
wait
-true
to wait until the terminal is actually paused- Throws:
InterruptedException
- if the call has been interrupted
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resume
public void resume()Description copied from interface:Terminal
Resumes reading the input stream after it has been paused.This method restarts the terminal's input processing after it has been temporarily stopped using
Terminal.pause()
orTerminal.pause(boolean)
. Once resumed, the terminal will continue to process input and handle signals triggered by special characters in the input stream.Calling this method when the terminal is not paused has no effect.
Example usage:
Terminal terminal = TerminalBuilder.terminal(); // Pause terminal input processing terminal.pause(); // Perform operations while terminal input is paused... // Resume terminal input processing terminal.resume();
- Specified by:
resume
in interfaceTerminal
- Overrides:
resume
in classAbstractTerminal
- See Also:
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paused
public boolean paused()Description copied from interface:Terminal
Check whether the terminal is currently reading the input stream or not. In order to process signal as quickly as possible, the terminal need to read the input stream and buffer it internally so that it can detect specific characters in the input stream (Ctrl+C, Ctrl+D, etc...) and raise the appropriate signals. However, there are some cases where this processing should be disabled, for example when handing the terminal control to a subprocess.- Specified by:
paused
in interfaceTerminal
- Overrides:
paused
in classAbstractTerminal
- Returns:
- whether the terminal is currently reading the input stream or not
- See Also:
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pump
public void pump() -
getCursorPosition
Description copied from interface:Terminal
Query the terminal to report the cursor position. As the response is read from the input stream, some characters may be read before the cursor position is actually read. Those characters can be given back usingorg.jline.keymap.BindingReader#runMacro(String)
- Specified by:
getCursorPosition
in interfaceTerminal
- Overrides:
getCursorPosition
in classAbstractTerminal
- Parameters:
discarded
- a consumer receiving discarded characters- Returns:
null
if cursor position reporting is not supported or a valid cursor position
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getProvider
Description copied from interface:TerminalExt
Returns the terminal provider that created this terminal.The terminal provider is responsible for creating and managing terminal instances on a specific platform. This method allows access to the provider that created this terminal, which can be useful for accessing provider-specific functionality or for creating additional terminals with the same provider.
- Specified by:
getProvider
in interfaceTerminalExt
- Overrides:
getProvider
in classLineDisciplineTerminal
- Returns:
- the
TerminalProvider
that created this terminal, ornull
if the terminal was created with no provider - See Also:
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