org.jenkinsci.remoting.util

Class ByteBufferQueue

java.lang.Object

org.jenkinsci.remoting.util.ByteBufferQueue

@NotThreadSafe
public class ByteBufferQueue
extends Object

A helper class to make queuing up of data easier.

Since:

3.0

Constructor Summary

Constructors

Constructor and Description
ByteBufferQueue(int bufferSize) Constructor.

Method Summary

Modifier and Type	Method and Description
byte	get() Reads the next byte from this queue.
int	get(byte[] dst, int offset, int len) This method transfers bytes from the head of this buffer queue into the given destination byte[].
void	get(ByteBuffer dst) This method transfers bytes from the head of this buffer queue into the given destination buffer.
boolean	hasRemaining() Tells whether there are any bytes between the current read index and the write index.
boolean	hasRemaining(int len) Tells whether there are any bytes between the current read index and the write index.
ByteBuffer	newByteBuffer() Creates a new byte buffer matched to the queue's current buffer size.
void	peek(ByteBuffer dst)
void	put(byte b) This method appends a single byte onto this buffer queue.
void	put(byte[] src, int offset, int len) This method appends bytes from the byte array onto this buffer queue.
void	put(ByteBuffer src) This method transfers the bytes remaining in the given source buffer appended onto this buffer queue.
long	remaining() Returns how much data is remaining between the current read index and the write index.
int	remaining(int limit) Returns how much data is remaining between the current read index and the write index.
long	skip(long bytes) Discards up to the specified number of bytes from the read index.
byte[]	toByteArray() Transfers all the bytes in the ByteBufferQueue from the read position to the write position into a new byte[].
String	toString()
void	unget(ByteBuffer src) This method transfers the bytes remaining in the given source buffer inserted at the head of this buffer queue.

Methods inherited from class java.lang.Object

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

Constructor Detail

ByteBufferQueue

public ByteBufferQueue(int bufferSize)

Constructor.

Parameters:

bufferSize - the size of buffers to use for queuing.

Method Detail

newByteBuffer

public ByteBuffer newByteBuffer()

Creates a new byte buffer matched to the queue's current buffer size.

Returns:

a new byte buffer matched to the queue's current buffer size.

put

public void put(ByteBuffer src)

This method transfers the bytes remaining in the given source buffer appended onto this buffer queue.

Parameters:

src - The source buffer from which bytes are to be read.

put

public void put(byte[] src,
                int offset,
                int len)

This method appends bytes from the byte array onto this buffer queue.

Parameters:

src - the source byte array.

offset - the offset from which to start taking bytes.

len - the number of bytes to transfer.

put

public void put(byte b)

This method appends a single byte onto this buffer queue.

Parameters:

b - the byte.

hasRemaining

public boolean hasRemaining()

Tells whether there are any bytes between the current read index and the write index.

Returns:

true if, and only if, there is at least one byte remaining in this buffer queue.

hasRemaining

public boolean hasRemaining(int len)

Tells whether there are any bytes between the current read index and the write index.

Parameters:

len - the number of bytes that we want at least remaining

Returns:

true if, and only if, there is at least len bytes remaining in this buffer queue.

remaining

public long remaining()

Returns how much data is remaining between the current read index and the write index.

Returns:

the total number of bytes remaining in this buffer queue.

remaining

public int remaining(int limit)

Returns how much data is remaining between the current read index and the write index.

Parameters:

limit - the maximum number of remaining bytes at which to short-circuit.

Returns:

the total number of bytes remaining in this buffer queue or the supplied maximum if there is at least the supplied limit remaining.

skip

public long skip(long bytes)

Discards up to the specified number of bytes from the read index.

Parameters:

bytes - the total number of bytes to discard.

Returns:

the number of bytes actually discarded.

peek

public void peek(ByteBuffer dst)

get

public void get(ByteBuffer dst)

This method transfers bytes from the head of this buffer queue into the given destination buffer. The number of bytes transferred will be the smaller of the number of bytes available and the remaining capacity of the destination buffer.

Parameters:

dst - the destination buffer into which bytes are to be written.

get

public int get(byte[] dst,
               int offset,
               int len)

This method transfers bytes from the head of this buffer queue into the given destination byte[]. The number of bytes transferred will be the smaller of the number of requested bytes and the remaining capacity of the destination buffer.

Parameters:

dst - the destination byte array into which the bytes are to be written.

offset - the offset in the byte array at which to write the bytes.

len - the number of bytes to transfer.

Returns:

the actual number of bytes transferred.

get

public byte get()

Reads the next byte from this queue.

Returns:

The byte at the read index.

Throws:

BufferUnderflowException - If there are no remaining bytes to be read.

unget

public void unget(ByteBuffer src)

This method transfers the bytes remaining in the given source buffer inserted at the head of this buffer queue.

Parameters:

src - The source buffer from which bytes are to be read.

toString

public String toString()

Overrides:

toString in class Object

toByteArray

public byte[] toByteArray()

Transfers all the bytes in the ByteBufferQueue from the read position to the write position into a new byte[].

Returns:

the byte[]