Module org.refcodes.io
Package org.refcodes.io

Class AbstractBytesDestination

java.lang.Object
org.refcodes.component.AbstractConnectable
org.refcodes.io.AbstractBytesDestination
All Implemented Interfaces:
ByteDestination, BytesDestination
Direct Known Subclasses:
AbstractBytesReceiver
public abstract class AbstractBytesDestination extends org.refcodes.component.AbstractConnectable implements BytesDestination
The AbstractBytesDestination is a base abstract implementation of the BytesDestination interface providing common functionality for concrete real implementations. A blocking queue is used internally to which received datagrams are put via pushDatagram(byte) and which can be retrieved via receiveByte(). The pushDatagram(byte) 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(byte) to the queue is blocked until elements are taken from the queue via receiveByte(). So cautions are taken to prevent a memory leak.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected LinkedBlockingQueue<Byte>
    _datagramQueue
     
    static final int
    DATAGRAM_QUEUE_SIZE
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    AbstractBytesDestination()
    Constructs a AbstractBytesDestination 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.
    AbstractBytesDestination(int aCapacity)
    Constructs a AbstractBytesDestination 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
    Description
    protected void
    pushDatagram(byte aDatagram)
    Pushes a datagram into the receiver and puts it into the blocking queue containing the so far received datagrams.
    protected void
    pushDatagrams(byte[] aDatagrams)
    Pushes datagrams into the receiver and puts them into the blocking queue containing the so far received datagrams.
    protected void
    pushDatagrams(byte[] aDatagrams, int aOffset, int aLength)
    Pushes datagrams into the receiver and puts them into the blocking queue containing the so far received datagrams.
    byte[]
    receiveAllBytes()
    Reads (receives) the all currently available data.
    byte
    receiveByte()
    Reads (receives) the next byte, in case none byte is available, then this method blocks until one is available.
    byte[]
    receiveBytes(int aMaxLength)
    Similar to BytesDestination.receiveAllBytes() though at maximum the amount of data as of the provided length returned.

    Methods inherited from class org.refcodes.component.AbstractConnectable

    isThrownAsOfAlreadyClosed

    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.BytesDestination

    receiveBytes

  • Field Details

  • Constructor Details

    • AbstractBytesDestination

      public AbstractBytesDestination()
      Constructs a AbstractBytesDestination 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(byte) to the queue is blocked until elements are taken from the queue via receiveByte().

    • AbstractBytesDestination

      public AbstractBytesDestination(int aCapacity)
      Constructs a AbstractBytesDestination 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(byte) to the queue is blocked until elements are taken from the queue via receiveByte().
      Parameters:
      aCapacity - The capacity of the queue holding the received datagrams.

  • Method Details

    • receiveByte

      public byte receiveByte() throws IOException
      Reads (receives) the next byte, in case none byte is available, then this method blocks until one is available.
      Specified by:
      receiveByte in interface ByteDestination
      Specified by:
      receiveByte in interface BytesDestination
      Returns:
      The next byte available .
      Throws:
      IOException - Thrown in case opening or accessing an open line (connection, junction, link) caused problems.
      EOFException - Signals that an end of file or end of stream has been reached unexpectedly during input.

    • receiveAllBytes

      public byte[] receiveAllBytes() throws IOException
      Reads (receives) the all currently available data.
      Specified by:
      receiveAllBytes in interface BytesDestination
      Returns:
      The according data.
      Throws:
      IOException - Thrown in case opening or accessing an open line (connection, junction, link) caused problems.
      EOFException - Signals that an end of file or end of stream has been reached unexpectedly during input.

    • receiveBytes

      public byte[] receiveBytes(int aMaxLength) throws IOException
      Similar to BytesDestination.receiveAllBytes() though at maximum the amount of data as of the provided length returned.
      Specified by:
      receiveBytes in interface BytesDestination
      Parameters:
      aMaxLength - The block-size which is not to exceeded by the returned data. A value of -1 specifies to retrieve all available datagrams (same behavior as method BytesDestination.receiveAllBytes().
      Returns:
      The according data.
      Throws:
      IOException - Thrown in case opening or accessing an open line (connection, junction, link) caused problems.
      EOFException - Signals that an end of file or end of stream has been reached unexpectedly during input.

    • pushDatagram

      protected void pushDatagram(byte aDatagram) throws IOException
      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 receiveByte(): Use AbstractBytesReceiver extension's AbstractBytesReceiver.available() 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 receiveByte() method.
      Throws:
      IOException - the open exception

    • pushDatagrams

      protected void pushDatagrams(byte[] aDatagrams) throws IOException
      Pushes datagrams into the receiver and puts them into the blocking queue containing the so far received datagrams. Them datagrams can be retrieved via receiveByte(): Use AbstractBytesReceiver extension's AbstractBytesReceiver.available() 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 receiveByte() method.
      Throws:
      IOException - the open exception

    • pushDatagrams

      protected void pushDatagrams(byte[] aDatagrams, int aOffset, int aLength) throws IOException
      Pushes datagrams into the receiver and puts them into the blocking queue containing the so far received datagrams. Them datagrams can be retrieved via receiveByte(): Use AbstractBytesReceiver extension's AbstractBytesReceiver.available() 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 receiveByte() 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:
      IOException - the open exception