org.jledit.jline

Class NonBlockingInputStream

java.lang.Object

java.io.InputStream

org.jledit.jline.NonBlockingInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, java.lang.Runnable

public class NonBlockingInputStream
extends java.io.InputStream
implements java.lang.Runnable

This class is "borrowed" from jline. We cannot reuse the class from jline as its not exported and using it as private leads to issues.

Constructor Summary

Constructors

Constructor and Description
NonBlockingInputStream(java.io.InputStream in, boolean isNonBlockingEnabled) Creates a NonBlockingInputStream out of a normal blocking stream.

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
boolean	isNonBlockingEnabled() Non-blocking is considered enabled if the feature is enabled and the I/O thread has not been shut down.
int	peek(long timeout) Peeks to see if there is a byte waiting in the input stream without actually consuming the byte.
int	read()
int	read(byte[] b, int off, int len) This version of read() is very specific to jline's purposes, it will always always return a single byte at a time, rather than filling the entire buffer.
int	read(long timeout) Attempts to read a character from the input stream for a specific period of time.
void	run()
void	shutdown() Shuts down the thread that is handling blocking I/O.

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

NonBlockingInputStream

public NonBlockingInputStream(java.io.InputStream in,
                      boolean isNonBlockingEnabled)

Creates a NonBlockingInputStream out of a normal blocking stream. Note that this call also spawn a separate thread to perform the blocking I/O on behalf of the thread that is using this class. The shutdown() method must be called in order to shut this thread down.

Parameters:

in - The input stream to wrap

isNonBlockingEnabled - If true, then the non-blocking methods read(long) and peek(long) will be available and, more importantly, the thread will be started to provide support for the feature. If false, then this class acts as a clean-passthru for the underlying I/O stream and provides very little overhead.

Method Detail

shutdown

public void shutdown()

Shuts down the thread that is handling blocking I/O. Note that if the thread is currently blocked waiting for I/O it will not actually shut down until the I/O is received. Shutting down the I/O thread does not prevent this class from being used, but causes the non-blocking methods to fail if called and causes isNonBlockingEnabled() to return false.

isNonBlockingEnabled

public boolean isNonBlockingEnabled()

Non-blocking is considered enabled if the feature is enabled and the I/O thread has not been shut down.

Returns:

true if non-blocking mode is enabled.

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

peek

public int peek(long timeout)
         throws java.io.IOException

Peeks to see if there is a byte waiting in the input stream without actually consuming the byte.

Parameters:

timeout - The amount of time to wait, 0 == forever

Returns:

-1 on eof, -2 if the timeout expired with no available input or the character that was read (without consuming it).

Throws:

java.io.IOException

read

public int read(long timeout)
         throws java.io.IOException

Attempts to read a character from the input stream for a specific period of time.

Parameters:

timeout - The amount of time to wait for the character

Returns:

The character read, -1 if EOF is reached, or -2 if the read timed out.

Throws:

java.io.IOException

read

public int read(byte[] b,
       int off,
       int len)
         throws java.io.IOException

This version of read() is very specific to jline's purposes, it will always always return a single byte at a time, rather than filling the entire buffer.

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

run

public void run()

Specified by:

run in interface java.lang.Runnable