Class DeltaView

  • All Implemented Interfaces:
    java.lang.Comparable<View>, java.lang.Iterable<Address>, Constructable<View>, SizeStreamable, Streamable

    public class DeltaView
    extends View
    Subclass of View with a null members field. Adds an array for left members and one for joined members compared to the previous view. A recipient receiving a DeltaView can construct a new view by grabbing the view corresponding to View.view_id, removing the left members and adding the new members.

    This class is only used with VIEW messages in GMS to install new views (not merge views). When a VIEW message is received, the DeltaView is read from the GMS.GmsHeader, a View is constructured and the header discarded. Therefore, the lifetime of a DeltaView is short: it is created and set in a GmsHeader, the header is then marshalled. On the receiving side, the DeltaView is created from the stream, a View is created and the DeltaView discarded again.

    Instances of this class are created by CoordGmsImpl.handleMembershipChange(java.util.Collection).

    JIRA issue: https://issues.jboss.org/browse/JGRP-1354

    Since:
    3.4
    Author:
    Bela Ban
    • Field Detail

      • ref_view_id

        protected ViewId ref_view_id
        The fields left_members and new_members refer to the view corresponding to ref_view_id
      • left_members

        protected Address[] left_members
        Members which left the view corresponding to ref_view_id
      • new_members

        protected Address[] new_members
        Members which joined the view corresponding to ref_view_id
    • Constructor Detail

      • DeltaView

        public DeltaView()
    • Method Detail

      • getRefViewId

        public ViewId getRefViewId()
      • getLeftMembers

        public Address[] getLeftMembers()
      • getNewMembers

        public Address[] getNewMembers()
      • writeTo

        public void writeTo​(java.io.DataOutput out)
                     throws java.io.IOException
        Description copied from interface: Streamable
        Write the entire state of the current object (including superclasses) to outstream. Note that the output stream must not be closed
        Specified by:
        writeTo in interface Streamable
        Overrides:
        writeTo in class View
        Throws:
        java.io.IOException
      • readFrom

        public void readFrom​(java.io.DataInput in)
                      throws java.io.IOException,
                             java.lang.ClassNotFoundException
        Description copied from interface: Streamable
        Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed
        Specified by:
        readFrom in interface Streamable
        Overrides:
        readFrom in class View
        Throws:
        java.io.IOException
        java.lang.ClassNotFoundException
      • iterator

        public java.util.Iterator<Address> iterator()
        Specified by:
        iterator in interface java.lang.Iterable<Address>
        Overrides:
        iterator in class View
      • toString

        public java.lang.String toString()
        Overrides:
        toString in class View