org.refcodes.io

Class AbstractReceiver<DATA extends Serializable>

java.lang.Object

org.refcodes.component.AbstractConnectableAutomaton

org.refcodes.io.AbstractReceiver<DATA>

Type Parameters:

DATA - The type of the datagram to be operated with.

All Implemented Interfaces:

org.refcodes.component.Closable, org.refcodes.component.Closable.CloseAutomaton, org.refcodes.component.ClosedAccessor, org.refcodes.component.ConnectableComponent, org.refcodes.component.ConnectableComponent.ConnectableAutomaton, org.refcodes.component.ConnectionStatusAccessor, org.refcodes.component.OpenedAccessor, BlockProvider<DATA>, BlockReceiver<DATA>, DatagramProvider<DATA>, DatagramReceiver<DATA>, Provider<DATA>, Receivable, Receiver<DATA>, org.refcodes.mixin.Releaseable

Direct Known Subclasses:

AbstractPrefetchInputStreamReceiver, LoopbackReceiverImpl, LoopbackTransceiverImpl, ReceiverDecorator

public abstract class AbstractReceiver<DATA extends Serializable>
extends org.refcodes.component.AbstractConnectableAutomaton
implements Receiver<DATA>

The AbstractReceiver is a base abstract implementation of the Receiver interface providing common functionality for concrete real live ByteDatagramReceiver and ByteBlockReceiver (= Receiver) implementations. A blocking queue is used internally to which received datagrams are put via pushDatagram(Serializable) and which can be retrieved via readDatagram(). The pushDatagram(Serializable) method is your hook when extending this class. Make sure your code fetches the datagrams quick enough to prevent filling up of the queue. In case the queue is filled up, adding elements via pushDatagram(Serializable) to the queue is blocked until elements are taken from the queue via readDatagram(). So cautions are taken to prevent a memory leak.

Nested Class Summary

Nested classes/interfaces inherited from interface org.refcodes.component.ConnectableComponent

org.refcodes.component.ConnectableComponent.ConnectableAutomaton

Nested classes/interfaces inherited from interface org.refcodes.component.OpenedAccessor

org.refcodes.component.OpenedAccessor.OpenedMutator, org.refcodes.component.OpenedAccessor.OpenedProperty

Nested classes/interfaces inherited from interface org.refcodes.component.Closable

org.refcodes.component.Closable.CloseAutomaton, org.refcodes.component.Closable.CloseBuilder<B extends org.refcodes.component.Closable.CloseBuilder<B>>

Nested classes/interfaces inherited from interface org.refcodes.component.ClosedAccessor

org.refcodes.component.ClosedAccessor.ClosedMutator, org.refcodes.component.ClosedAccessor.ClosedProperty

Nested classes/interfaces inherited from interface org.refcodes.component.ConnectionStatusAccessor

org.refcodes.component.ConnectionStatusAccessor.ConnectionStatusMutator, org.refcodes.component.ConnectionStatusAccessor.ConnectionStatusProperty

Field Summary

Fields

Modifier and Type	Field and Description
static int	DATAGRAM_QUEUE_SIZE

Constructor Summary

Constructors

Constructor and Description
AbstractReceiver() Constructs a AbstractReceiver with a default sized blocking queue enabling a maximum of DATAGRAM_QUEUE_SIZE datagrams. ------------------------------------------------------------------------- Make sure your code fetches the datagrams quick enough to prevent filling up of the queue.
AbstractReceiver(int aCapacity) Constructs a AbstractReceiver with a custom sized blocking queue enabling a maximum of datagrams as specified by the capacity parameter. ------------------------------------------------------------------------- Make sure your code fetches the datagrams quick enough to prevent filling up of the queue.

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	hasDatagram() Determines whether a datagram is available from a DatagramSender.
protected void	pushDatagram(DATA aDatagram) Pushes a datagram into the receiver and puts it into the blocking queue containing the so far received datagrams.
protected void	pushDatagrams(DATA[] aDatagrams) Pushes datagrams into the receiver and puts them into the blocking queue containing the so far received datagrams.
protected void	pushDatagrams(DATA[] aDatagrams, int aOffset, int aLength) Pushes datagrams into the receiver and puts them into the blocking queue containing the so far received datagrams.
DATA	readDatagram() Reads (receives) the next datagram passed from a DatagramSender counterpart.
DATA[]	readDatagrams() Read datagrams.
void	releaseAll()

Methods inherited from class org.refcodes.component.AbstractConnectableAutomaton

getConnectionStatus, isClosable, isClosed, isOpenable, isOpened, open, setConnectionStatus

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.refcodes.io.Receiver

readDatagrams

Methods inherited from interface org.refcodes.component.OpenedAccessor

isOpened

Methods inherited from interface org.refcodes.component.Closable.CloseAutomaton

isClosable

Methods inherited from interface org.refcodes.component.Closable

closeIn, closeQuietly, closeUnchecked

Methods inherited from interface org.refcodes.component.ClosedAccessor

isClosed

Methods inherited from interface org.refcodes.component.ConnectionStatusAccessor

getConnectionStatus

Field Detail

DATAGRAM_QUEUE_SIZE

public static final int DATAGRAM_QUEUE_SIZE

See Also:

Constant Field Values

Constructor Detail

AbstractReceiver

public AbstractReceiver()

Constructs a AbstractReceiver with a default sized blocking queue enabling a maximum of DATAGRAM_QUEUE_SIZE datagrams. ------------------------------------------------------------------------- Make sure your code fetches the datagrams quick enough to prevent filling up of the queue. In case the queue is filled up, adding elements via pushDatagram(Serializable) to the queue is blocked until elements are taken from the queue via readDatagram().

AbstractReceiver

public AbstractReceiver(int aCapacity)

Constructs a AbstractReceiver with a custom sized blocking queue enabling a maximum of datagrams as specified by the capacity parameter. ------------------------------------------------------------------------- Make sure your code fetches the datagrams quick enough to prevent filling up of the queue. In case the queue is filled up, adding elements via pushDatagram(Serializable) to the queue is blocked until elements are taken from the queue via readDatagram().

Parameters:

aCapacity - The capacity of the queue holding the received datagrams.

Method Detail

readDatagram

public DATA readDatagram()
                  throws org.refcodes.component.OpenException,
                         InterruptedException

Reads (receives) the next datagram passed from a DatagramSender counterpart. In case none datagram is available, then this method blocks until one is available. To prevent blocking, use the DatagramReceiver extension's Receivable.hasDatagram() method to test beforehand whether a byte is available (in a multi-threaded usage scenario, Receivable.hasDatagram() is not a reliable indicator whether this method will block or not). When a Thread is waiting for a datagram to be read and Thread.interrupt() is being called, then the operation is aborted and an InterruptedException is thrown.

Specified by:

readDatagram in interface DatagramProvider<DATA extends Serializable>

Returns:

The next datagram sent from the DatagramSender counterpart.

Throws:

org.refcodes.component.OpenException - Thrown in case opening or accessing an open line (connection, junction, link) caused problems.

InterruptedException - Thrown when a Thread is waiting, sleeping, or otherwise occupied, and the Thread is interrupted, either before or during the activity.

readDatagrams

public DATA[] readDatagrams()
                     throws org.refcodes.component.OpenException,
                            InterruptedException

Read datagrams.

Specified by:

readDatagrams in interface BlockProvider<DATA extends Serializable>

Specified by:

readDatagrams in interface Provider<DATA extends Serializable>

Specified by:

readDatagrams in interface Receiver<DATA extends Serializable>

Returns:

the DAT a[]

Throws:

org.refcodes.component.OpenException - the open exception

InterruptedException - the interrupted exception

hasDatagram

public boolean hasDatagram()
                    throws org.refcodes.component.OpenException

Determines whether a datagram is available from a DatagramSender. Use the DatagramProvider extenison's DatagramProvider.readDatagram() method for retrieving the available datagram.

Specified by:

hasDatagram in interface Receivable

Returns:

True in case there is a datagram ready to be retrieved .

Throws:

org.refcodes.component.OpenException - Thrown in case opening or accessing an open line (connection, junction, link) caused problems.

close

public void close()
           throws org.refcodes.component.CloseException

Specified by:

close in interface org.refcodes.component.Closable

Overrides:

close in class org.refcodes.component.AbstractConnectableAutomaton

Throws:

org.refcodes.component.CloseException

releaseAll

public void releaseAll()

Specified by:

releaseAll in interface org.refcodes.mixin.Releaseable

pushDatagram

protected void pushDatagram(DATA aDatagram)
                     throws org.refcodes.component.OpenException

Pushes a datagram into the receiver and puts it into the blocking queue containing the so far received datagrams. Them datagrams can be retrieved via readDatagram(): use hasDatagram() to test beforehand whether there is a datagram available.

Parameters:

aDatagram - The datagram to be pushed at the end of the blocking queue; to be retrieved with the readDatagram() method.

Throws:

org.refcodes.component.OpenException - the open exception

pushDatagrams

protected void pushDatagrams(DATA[] aDatagrams)
                      throws org.refcodes.component.OpenException

Pushes datagrams into the receiver and puts them into the blocking queue containing the so far received datagrams. Them datagrams can be retrieved via readDatagram(): use hasDatagram() to test beforehand whether there is a datagram available.

Parameters:

aDatagrams - The datagrams to be pushed at the end of the blocking queue; to be retrieved with the readDatagram() method.

Throws:

org.refcodes.component.OpenException - the open exception

pushDatagrams

protected void pushDatagrams(DATA[] aDatagrams,
                             int aOffset,
                             int aLength)
                      throws org.refcodes.component.OpenException

Pushes datagrams into the receiver and puts them into the blocking queue containing the so far received datagrams. Them datagrams can be retrieved via readDatagram(): use hasDatagram() to test beforehand whether there is a datagram available.

Parameters:

aDatagrams - The datagrams to be pushed at the end of the blocking queue; to be retrieved with the readDatagram() method.

aOffset - The offset to start taking data from to be pushed.

aLength - The number of elements to be pushed from the offset onwards.

Throws:

org.refcodes.component.OpenException - the open exception