public final class AsynchronousByteCharChannel extends Object implements AsynchronousCharChannel
| Modifier and Type | Method and Description |
|---|---|
void |
close() |
boolean |
isOpen() |
static AsynchronousByteCharChannel |
open(AsynchronousByteChannel channel,
Charset charset,
PeripheralChannelGroup group)
Opens an asynchronous character channel.
|
Future<Integer> |
read(CharBuffer target)
Reads a sequence of characters from this channel into the given buffer.
|
<A> void |
read(CharBuffer target,
A attachment,
CompletionHandler<Integer,? super A> handler)
Reads a sequence of characters from this channel into the given buffer.
|
Future<String> |
readLine()
Reads a line of characters from this channel into the given buffer.
|
<A> void |
readLine(A attachment,
CompletionHandler<String,? super A> handler)
Reads a line of characters from this channel into the given buffer.
|
String |
toString() |
Future<Integer> |
write(CharBuffer source)
Writes a sequence of characters to this channel from the given buffer.
|
<A> void |
write(CharBuffer source,
A attachment,
CompletionHandler<Integer,? super A> handler)
Writes a sequence of characters to this channel from the given buffer.
|
public static AsynchronousByteCharChannel open(AsynchronousByteChannel channel, Charset charset, PeripheralChannelGroup group)
channel - the underlying AsynchronousByteChannelcharset - the character setgroup - the group associated with the channelNullPointerException - if channel, charset or group are nullpublic <A> void read(CharBuffer target, A attachment, CompletionHandler<Integer,? super A> handler) throws IllegalArgumentException, ReadPendingException, ShutdownChannelGroupException
AsynchronousCharChannel This method initiates an asynchronous read operation to read a sequence of characters from
this channel into the given buffer. The handler parameter is a completion handler that is invoked when the read operation completes
(or fails). The result passed to the completion handler is the number of characters read or -1
if no characters could be read because the channel has reached end-of-stream.
The read operation may read up to r characters from the channel, where r is
the number of characters remaining in the buffer, that is,
target.remaining() at the time that the read is attempted. Where r is 0, the
read operation completes immediately with a result of
0 without initiating an I/O operation.
Suppose that a character sequence of length n is read, where 0 < n <= r. This character sequence will be transferred into the buffer so that the first character in the sequence is at index p and the last character is at index p + n - 1, where p is the buffer's position at the moment the read is performed. Upon completion the buffer's position will be equal to p + n; its limit will not have changed.
Buffers are not safe for use by multiple concurrent threads so care should be taken to not to access the buffer until the operation has completed.
This method may be invoked at any time. Some channel types may not allow more than one read
to be outstanding at any given time. If a thread initiates a read operation before a previous
read operation has completed then a ReadPendingException might be thrown.
read in interface AsynchronousCharChannelA - The attachment typetarget - The buffer into which characters are to be transferredattachment - The object to attach to the I/O operation; can be nullhandler - The completion handlerIllegalArgumentException - If the buffer is read-onlyReadPendingException - If the channel does not allow more than one read to be outstanding
and a previous read has not completedShutdownChannelGroupException - If the channel is associated with a group that has terminatedpublic Future<Integer> read(CharBuffer target) throws IllegalArgumentException, ReadPendingException
AsynchronousCharChannel This method initiates an asynchronous read operation to read a
sequence of characters from this channel into the given buffer. The method
behaves in exactly the same manner as the read(CharBuffer,Object,CompletionHandler) method except that instead
of a completion handler, this method returns a Future
representing the pending result. The get method
returns the number of characters read or -1 if no characters could be
read because the channel has reached end-of-stream.
read in interface AsynchronousCharChanneltarget - The buffer into which characters are to be transferredIllegalArgumentException - If the buffer is read-onlyReadPendingException - If the channel does not allow more than one read to be outstanding
and a previous read has not completedpublic <A> void readLine(A attachment,
CompletionHandler<String,? super A> handler)
throws IllegalArgumentException,
ReadPendingException,
ShutdownChannelGroupException
AsynchronousCharChannel This method initiates an asynchronous read operation to read a
line of characters from this channel into the given buffer. A line
is delimited by any one of a line feed '\n',
a carriage return '\r', or a carriage return followed
immediately by a linefeed. The handler parameter is a completion
handler that is invoked when the read operation completes (or fails).
The result passed to the completion handler is the line of characters
that was read (excluding termination characters) or null if no
characters could be read because the channel has reached end-of-stream.
Suppose that a character sequence of length n is read, where n > 0. This character sequence will be transferred into the buffer so that the first character in the sequence is at index p and the last character is at index p + n - 1 - d, where p is the buffer's position at the moment the read is performed and d is the length of the line delimiter. Upon completion the buffer's position will be equal to p + n - d; its limit will not have changed.
Buffers are not safe for use by multiple concurrent threads so care should be taken to not to access the buffer until the operation has completed.
This method may be invoked at any time. Some channel types may not
allow more than one read to be outstanding at any given time. If a thread
initiates a read operation before a previous read operation has
completed then a ReadPendingException might be thrown.
readLine in interface AsynchronousCharChannelA - The attachment typeattachment - The object to attach to the I/O operation; can be nullhandler - The completion handlerIllegalArgumentException - If the buffer is read-onlyReadPendingException - If the channel does not allow more than one read to be outstanding
and a previous read has not completedShutdownChannelGroupException - If the channel is associated with a group that has terminatedpublic Future<String> readLine() throws IllegalArgumentException, ReadPendingException
AsynchronousCharChannel This method initiates an asynchronous read operation to read a
line of characters from this channel into the given buffer. A line
is considered to be terminated by any one of a line feed '\n',
a carriage return '\r', or a carriage return followed
immediately by a linefeed. The method behaves in exactly the same manner
as the readLine(Object, CompletionHandler) method except that instead
of a completion handler, this method returns a Future
representing the pending result. The get method
returns the line of characters that were read (excluding termination characters)
or null if no characters could be read because the channel has reached end-of-stream.
readLine in interface AsynchronousCharChannelIllegalArgumentException - If the buffer is read-onlyReadPendingException - If the channel does not allow more than one read to be outstanding
and a previous read has not completedpublic <A> void write(CharBuffer source, A attachment, CompletionHandler<Integer,? super A> handler) throws WritePendingException, ShutdownChannelGroupException
AsynchronousCharChannel This method initiates an asynchronous write operation to write a
sequence of characters to this channel from the given buffer. The handler parameter is a completion handler that is invoked when the write
operation completes (or fails). The result passed to the completion
handler is the number of characters written.
The write operation may write up to r characters to the channel,
where r is the number of characters remaining in the buffer, that is,
src.remaining() at the time that the write is attempted. Where
r is 0, the write operation completes immediately with a result of
0 without initiating an I/O operation.
Suppose that a character sequence of length n is written, where 0 < n <= r. This character sequence will be transferred from the buffer starting at index p, where p is the buffer's position at the moment the write is performed; the index of the last character written will be p + n - 1. Upon completion the buffer's position will be equal to p + n; its limit will not have changed.
Buffers are not safe for use by multiple concurrent threads so care should be taken to not to access the buffer until the operation has completed.
This method may be invoked at any time. Some channel types may not
allow more than one write to be outstanding at any given time. If a thread
initiates a write operation before a previous write operation has
completed then a WritePendingException might be thrown.
The handler fails with MalformedInputException if source is not a legal
sixteen-bit Unicode sequence or UnmappableCharacterException if source is valid
but cannot be mapped to an output byte sequence.
write in interface AsynchronousCharChannelA - The attachment typesource - The buffer from which characters are to be retrievedattachment - The object to attach to the I/O operation; can be nullhandler - The completion handler objectWritePendingException - If the channel does not allow more than one write to be outstanding
and a previous write has not completedShutdownChannelGroupException - If the channel is associated with a group that has terminatedpublic Future<Integer> write(CharBuffer source) throws WritePendingException
AsynchronousCharChannel This method initiates an asynchronous write operation to write a
sequence of characters to this channel from the given buffer. The method
behaves in exactly the same manner as the write(CharBuffer,Object,CompletionHandler) method except that instead
of a completion handler, this method returns a Future
representing the pending result. The get method
returns the number of characters written.
The future fails with MalformedInputException if source is not a legal
sixteen-bit Unicode sequence or UnmappableCharacterException if source is valid
but cannot be mapped to an output byte sequence.
write in interface AsynchronousCharChannelsource - The buffer from which characters are to be retrievedWritePendingException - If the channel does not allow more than one write to be outstanding
and a previous write has not completedpublic void close()
throws IOException
close in interface Closeableclose in interface AutoCloseableclose in interface AsynchronousChannelclose in interface ChannelIOExceptionCopyright © 2012. All Rights Reserved.