Package 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
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
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate int
private IOException
private Reader
private String
static final int
private Thread
private long
private boolean
Fields inherited from class org.jline.utils.NonBlockingReader
EOF
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Constructor Summary
ConstructorsConstructorDescriptionNonBlockingReaderImpl
(String name, Reader in) Creates aNonBlockingReader
out of a normal blocking reader. -
Method Summary
Modifier and TypeMethodDescriptionvoid
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.int
readBuffered
(char[] b, int off, int len, long timeout) boolean
ready()
private void
run()
void
shutdown()
Shuts down the thread that is handling blocking I/O.private void
Methods inherited from class org.jline.utils.NonBlockingReader
available, peek, read, read, read, readBuffered, readBuffered
Methods inherited from class java.io.Reader
mark, markSupported, nullReader, read, read, reset, skip, transferTo
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Field Details
-
READ_EXPIRED
public static final int READ_EXPIRED- See Also:
-
in
-
ch
private int ch -
name
-
threadIsReading
private boolean threadIsReading -
exception
-
threadDelay
private long threadDelay -
thread
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Constructor Details
-
NonBlockingReaderImpl
Creates aNonBlockingReader
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. Theshutdown()
method must be called in order to shut this thread down.- Parameters:
name
- The reader namein
- The reader to wrap
-
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Method Details
-
startReadingThreadIfNeeded
private void startReadingThreadIfNeeded() -
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 classNonBlockingReader
-
close
- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceCloseable
- Specified by:
close
in classReader
- Throws:
IOException
-
ready
- Overrides:
ready
in classReader
- Throws:
IOException
-
readBuffered
- Specified by:
readBuffered
in classNonBlockingReader
- Throws:
IOException
-
read
Attempts to read a character from the input stream for a specific period of time.- Specified by:
read
in classNonBlockingReader
- Parameters:
timeout
- The amount of time to wait for the characterisPeek
-true
if 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
-
run
private void run() -
clear
- Throws:
IOException
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