org.jline.utils

Class NonBlockingReaderImpl

java.lang.Object

java.io.Reader

org.jline.utils.NonBlockingReader

org.jline.utils.NonBlockingReaderImpl

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public class NonBlockingReaderImpl
extends NonBlockingReader

This class wraps a regular reader and allows it to appear as if it is non-blocking; that is, reads can be performed against it that timeout if no data is seen for a period of time. This effect is achieved by having a separate thread perform all non-blocking read requests and then waiting on the thread to complete.

VERY IMPORTANT NOTES

• This class is not thread safe. It expects at most one reader.
• The shutdown() method must be called in order to shut down the thread that handles blocking I/O.

Since:

2.7

Author:

Scott C. Gray <scottgray1@gmail.com>

Field Summary

Fields

Modifier and Type	Field and Description
static int	READ_EXPIRED

Fields inherited from class org.jline.utils.NonBlockingReader

EOF

Fields inherited from class java.io.Reader

lock

Constructor Summary

Constructors

Constructor and Description
NonBlockingReaderImpl(String name, Reader in) Creates a NonBlockingReader out of a normal blocking reader.

Method Summary

Modifier and Type	Method and Description
void	clear()
void	close()
protected int	read(long timeout, boolean isPeek) Attempts to read a character from the input stream for a specific period of time.
boolean	ready()
void	shutdown() Shuts down the thread that is handling blocking I/O.

Methods inherited from class org.jline.utils.NonBlockingReader

available, peek, read, read, read

Methods inherited from class java.io.Reader

mark, markSupported, read, read, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

READ_EXPIRED

public static final int READ_EXPIRED

See Also:

Constant Field Values

Constructor Detail

NonBlockingReaderImpl

public NonBlockingReaderImpl(String name,
                             Reader in)

Creates a NonBlockingReader out of a normal blocking reader. 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:

name - The reader name

in - The reader to wrap

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.

Overrides:

shutdown in class NonBlockingReader

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class Reader

Throws:

IOException

ready

public boolean ready()
              throws IOException

Overrides:

ready in class Reader

Throws:

IOException

read

protected int read(long timeout,
                   boolean isPeek)
            throws IOException

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

Specified by:

read in class NonBlockingReader

Parameters:

timeout - The amount of time to wait for the character

isPeek - trueif the character read must not be consumed

Returns:

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

Throws:

IOException - if anything wrong happens

clear

public void clear()
           throws IOException

Throws:

IOException