Package org.jgroups.stack

Class GossipRouter

  • All Implemented Interfaces:
    ConnectionListener, Receiver
    public class GossipRouter
extends ReceiverAdapter
implements ConnectionListener
    Router for TCP based group comunication (using layer TCP instead of UDP). Instead of the TCP layer sending packets point-to-point to each other member, it sends the packet to the router which - depending on the target address - multicasts or unicasts it to the group / or single member.

    This class is especially interesting for applets which cannot directly make connections (neither UDP nor TCP) to a host different from the one they were loaded from. Therefore, an applet would create a normal channel plus protocol stack, but the bottom layer would have to be the TCP layer which sends all packets point-to-point (over a TCP connection) to the router, which in turn forwards them to their end location(s) (also over TCP). A centralized router would therefore have to be running on the host the applet was loaded from.

    An alternative for running JGroups in an applet (IP multicast is not allows in applets as of 1.2), is to use point-to-point UDP communication via the gossip server. However, then the appplet has to be signed which involves additional administrative effort on the part of the user.

    Note that a GossipRouter is also a good way of running JGroups in Amazon's EC2 environment which (as of summer 09) doesn't support IP multicasting.

    Since:
    2.1.1
    Author:
    Bela Ban, Vladimir Blagojevic, Ovidiu Feodorov

    • Field Detail

      • bind_addr

        protected java.net.InetAddress bind_addr

      • port

        protected int port

      • expiry_time

        protected long expiry_time

      • linger_timeout

        protected long linger_timeout

      • sock_read_timeout

        protected long sock_read_timeout

      • backlog

        protected int backlog

      • jmx

        protected boolean jmx

      • use_nio

        protected boolean use_nio

      • emit_suspect_events

        protected boolean emit_suspect_events

      • dump_msgs

        protected org.jgroups.stack.GossipRouter.DumpMessages dump_msgs

      • max_length

        protected int max_length

      • running

        protected final java.util.concurrent.atomic.AtomicBoolean running

      • timer

        protected java.util.Timer timer

      • log

        protected final Log log

      • address_mappings

        protected final java.util.concurrent.ConcurrentMap<java.lang.String,​java.util.concurrent.ConcurrentMap<Address,​GossipRouter.Entry>> address_mappings

      • MSG_CONSUMER

        protected static final java.util.function.BiConsumer<java.lang.Short,​Message> MSG_CONSUMER

    • Constructor Detail

      • GossipRouter

        public GossipRouter​(java.lang.String bind_addr,
                    int local_port)

      • GossipRouter

        public GossipRouter​(java.net.InetAddress bind_addr,
                    int local_port)

    • Method Detail

      • localAddress

        public Address localAddress()

      • bindAddress

        public java.lang.String bindAddress()

      • bindAddress

        public GossipRouter bindAddress​(java.net.InetAddress addr)

      • port

        public int port()

      • expiryTime

        public long expiryTime()

      • lingerTimeout

        public long lingerTimeout()

      • lingerTimeout

        public GossipRouter lingerTimeout​(long t)

      • socketReadTimeout

        public long socketReadTimeout()

      • socketReadTimeout

        public GossipRouter socketReadTimeout​(long t)

      • backlog

        public int backlog()

      • jmx

        public boolean jmx()

      • useNio

        public boolean useNio()

      • emitSuspectEvents

        public boolean emitSuspectEvents()

      • emitSuspectEvents

        public GossipRouter emitSuspectEvents​(boolean flag)

      • dumpMessages

        public org.jgroups.stack.GossipRouter.DumpMessages dumpMessages()

      • dumpMessages

        public GossipRouter dumpMessages​(org.jgroups.stack.GossipRouter.DumpMessages flag)

      • maxLength

        public int maxLength()

      • running

        public boolean running()

      • start

        public GossipRouter start()
                   throws java.lang.Exception
        Lifecycle operation. Called after create(). When this method is called, the managed attributes have already been set.
        Brings the Router into a fully functional state.
        Throws:
        java.lang.Exception

      • stop

        public void stop()
        Always called before destroy(). Close connections and frees resources.

      • dumpRoutingTable

        public java.lang.String dumpRoutingTable()

      • dumpAddresssMappings

        public java.lang.String dumpAddresssMappings()

      • receive

        public void receive​(Address sender,
                    byte[] buf,
                    int offset,
                    int length)
        Description copied from interface: Receiver
        Delivers a message from a given sender to the application
        Specified by:
        receive in interface Receiver
        Overrides:
        receive in class ReceiverAdapter
        Parameters:
        sender - The sender of the message
        buf - The buffer. An application typically de-serializes data from the buffer into objects used by the application. Note that when receive() returns, it is not safe to use the buffer any longer; if an application needs to use a buffer after this callback returns, it must make a copy.
        offset - The offset at which the received data starts
        length - The length of the received data

      • receive

        public void receive​(Address sender,
                    java.io.DataInput in)
             throws java.lang.Exception
        Specified by:
        receive in interface Receiver
        Overrides:
        receive in class ReceiverAdapter
        Throws:
        java.lang.Exception

      • handleRegister

        protected void handleRegister​(Address sender,
                              java.io.DataInput in)

      • handleUnregister

        protected void handleUnregister​(java.io.DataInput in)

      • handleGetMembersRequest

        protected void handleGetMembersRequest​(Address sender,
                                       java.io.DataInput in)

      • dump

        protected static void dump​(GossipData data)

      • readRequest

        protected GossipData readRequest​(java.io.DataInput in)

      • addAddressMapping

        protected void addAddressMapping​(Address sender,
                                 java.lang.String group,
                                 Address addr,
                                 PhysicalAddress phys_addr,
                                 java.lang.String logical_name)

      • removeAddressMapping

        protected void removeAddressMapping​(java.lang.String group,
                                    Address addr)

      • removeFromAddressMappings

        protected void removeFromAddressMappings​(Address client_addr)

      • route

        protected void route​(java.lang.String group,
                     Address dest,
                     byte[] msg,
                     int offset,
                     int length)

      • sendToAllMembersInGroup

        protected void sendToAllMembersInGroup​(java.util.Set<java.util.Map.Entry<Address,​GossipRouter.Entry>> dests,
                                       byte[] buf,
                                       int offset,
                                       int len)

      • sendToMember

        protected void sendToMember​(Address dest,
                            byte[] buf,
                            int offset,
                            int len)

      • main

        public static void main​(java.lang.String[] args)
                 throws java.lang.Exception
        Throws:
        java.lang.Exception