[jgroups-users] Porting-Guide/Release-Notes between 3.6.14 and 4.0.15

[Questions/problems r. to u. J. <jav...@li...>]

Hi:
 Can someone point me to a porting guide - trying to port code between
3.6.14 and 4.0.15.
 (e.g. things that will break and must be chagned between 3 and 4?)

 We use the jgroups library in a "deployed" application on the JBoss EAP7
platform, currently trying to
 upgrade between EAP7.1.x and 7.2.X, the JBoss upgrade changes jgroups
between 3.6.14 and 4.0.15.

 Some of the inital issues was are facing include, any hints/suggestions
would be greatly appreciated.

 a) Issue related to:
 https://issues.redhat.com/browse/JGRP-1860

 Bela already provided an inital answer.  See [1] below for more details.

 b)  org.jgroups.util.UUID is NOT backwards compatibile
 See [2] for more details.

 c) Channel deprecated.  Can we just change all uses of "Channel" to
"JChannel" and all will be OK?

 d) org.jgroups.timeoutexception was removed.  Can I simply import
java.util.concurrent.timeoutexception in
 place of org.jgroups.timeoutexception?

 e) ... tbd

 Cheers


 [1] In jgroups-3.6.14.Final-redhat-1.jar (EAP7.1.4)
org.jgroups.blocks.RpcDispatcher had a static interface defined.

    public static interface Marshaller {
        public Buffer objectToBuffer(Object var1) throws Exception;

        public Object objectFromBuffer(byte[] var1, int var2, int var3)
throws Exception;
    }

In 4.0.15 there is now a Interface Marshaller with completely different
methods/parameters.
Any suggestions?

[2] With jgroups jgroups-3.6.14.Final-redhat-1.jar (EAP7.1.4) we extended
org.jgroups.util.UUID to
create our ToddsPayloadUUID and add
String(s) ipAddress, port and hostname (which are used by our application).

Unfortunately in 4.0.15 org.jgroups.util.UUID is missing some methods we
used, including:
size(), readExternal(), writeExternal(), writeTo(), readFrom()

When we create a JChannel, we add the class to the ClassConfigurator with:

 org.jgroups.conf.ClassConfigurator.add(1025, ToddsPayloadUUID.class);

We then call the create/add and AddressGenerator to the channel - code
snippet:


    private static Channel createSamChannel (String aInProps)
    {
...

 try
        {
            myC = new JChannel(aInProps);
            createSamChannelLogger.logActivity("Create JChannel with
config=" + aInProps);
            System.out.println("Create JChannel with config=" + aInProps);
            myC.addAddressGenerator(new AddressGenerator()
            {
                // Set Address Generator to SamPayloadUUID and set
IpAddress and port to be what is
                //configured in the jgroup configuration
                public Address generateAddress()
                {
                    Map
lTcpMap=com.timetra.nms.server.multiserver.core.common.Util.getJGroupElement("TCP");
                    String ipAddress =(String) lTcpMap.get("bind_addr");
                    String port = (String) lTcpMap.get("bind_port");
                    String hostname;
                    try
                    {
                        hostname =
InetAddress.getByName(ipAddress).getHostName();
                    }
                    catch (UnknownHostException e)
                    {
                        hostname = ipAddress;
                    }
                    return (Address)SamPayloadUUID.randomUUID(ipAddress,
port, hostname);
                }
            });
        }