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Thread: Help with setReuseAddress(boolean on) method

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    Default Help with setReuseAddress(boolean on) method

    I dont undestand well this method.

    Turning on this, Two sockets can use the same port at the same time?

    I thank your helps.


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    Default Re: Help with setReuseAddress(boolean on) method

    Quote Originally Posted by Luisperseverence View Post
    I dont undestand well this method.

    Turning on this, Two sockets can use the same port at the same time?

    I thank your helps.
    Hi there.

    You should consider posting the javadoc with your question if you want to ask about specific method.

    Here it is:
    setReuseAddress
    public void setReuseAddress(boolean on)
    throws SocketException
    Enable/disable the SO_REUSEADDR socket option.
    When a TCP connection is closed the connection may remain in a timeout state for a period of time after the connection is closed (typically known as the TIME_WAIT state or 2MSL wait state). For applications using a well known socket address or port it may not be possible to bind a socket to the required SocketAddress if there is a connection in the timeout state involving the socket address or port.

    Enabling SO_REUSEADDR prior to binding the socket using bind(SocketAddress) allows the socket to be bound even though a previous connection is in a timeout state.

    When a ServerSocket is created the initial setting of SO_REUSEADDR is not defined. Applications can use getReuseAddress() to determine the initial setting of SO_REUSEADDR.

    The behaviour when SO_REUSEADDR is enabled or disabled after a socket is bound (See isBound()) is not defined.

    Parameters:
    on - whether to enable or disable the socket option
    Throws:
    SocketException - if an error occurs enabling or disabling the SO_RESUEADDR socket option, or the socket is closed.
    Since:
    1.4
    See Also:
    getReuseAddress(), bind(SocketAddress), isBound(), isClosed()
    To answer to your question shortly: Nope.
    As the javadoc states, it enables you to manually set the socket for reuse after the socket is closed.

    Hope that was of some help

  3. The Following User Says Thank You to Wizand For This Useful Post:

    GregBrannon (October 7th, 2014)

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    Default Re: Help with setReuseAddress(boolean on) method

    You should consider posting the javadoc with your question . . .
    Even better, read the javadoc first and then ask questions to clear up any confusion you have with it.

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    Default Re: Help with setReuseAddress(boolean on) method

    Hello, you have reason, but I have already seen that before send my question, however, I dont understand it very well.

    When one socket is closed, it remains a little of time more, in order to receive the packets which were on the way, that didnt achieve to arrive, the system doesnt do anything with those packets, only make sure that those ones wont arrive to one open new process that use the same port.

    My question is: ┐setReuseAddress(True) only does that the port closes exactly when the method close() is invoked, and this way, when in that time a new process open this port, the packets which were on the way, will enter to this new process?

    Sorry if I understand totaly bad. Really that I am not the person who ask with no investigate first.
    Last edited by Luisperseverence; October 8th, 2014 at 01:25 AM.
    I am from Peru, therefore I speak spanish, So, sorry if I have some mistakes in my english gramar

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