elanp2pserver.java

编辑视频文件

            // the same pipe advertisement to talk to the server. When the client
            // discovers the module advertisement it will extract the pipe
            // advertisement to create its pipe.  
            PipeAdvertisement pipeadv = (PipeAdvertisement) AdvertisementFactory.newAdvertisement(PipeAdvertisement.getAdvertisementType());

            // Setup some of the information field about the servive. In this
            // example, we just set the name, provider and version and a pipe
            // advertisement. The module creates an input pipes to listen
            // on this pipe endpoint.
            pipeadv.setName("JXTA-ELAN");

            PipeID pid = (PipeID) IDFactory.newPipeID(sessionGroup.getPeerGroupID());

            pipeadv.setPipeID(pid);

            /*            System.out.println("Reading in file " + FILENAME);
               PipeAdvertisement pipeadv = null;

                try {
                    FileInputStream is = new FileInputStream(FILENAME);
                    pipeadv = (PipeAdvertisement)
                        AdvertisementFactory.newAdvertisement(
                        new MimeMediaType("text/xml"), is);
                    is.close();
                } catch (java.io.IOException e) {
                    System.out.println("failed to read/parse pipe advertisement");
                    e.printStackTrace();
                    System.exit(-1);
                }  */
            // add the pipe advertisement to the ModuleSpecAdvertisement
            mdadv.setPipeAdvertisement(pipeadv);

            // display the advertisement as a plain text document.
            System.out.println("Created service advertisement:");

            StructuredTextDocument doc = (StructuredTextDocument) mdadv.getDocument(new MimeMediaType(
                        "text/plain"));

            StringWriter out = new StringWriter();
            doc.sendToWriter(out);
            System.out.println(out.toString());
            out.close();

            // Ok the Module advertisement was created, just publish
            // it in my local cache and into the NetPeerGroup.
            sessionDiscoSvc.publish(mdadv, DiscoveryService.ADV);
            sessionDiscoSvc.remotePublish(mdadv, DiscoveryService.ADV);

            // We are now ready to start the service --
            // create the input pipe endpoint clients will
            // use to connect to the service
            myPipe = pipeSvc.createInputPipe(pipeadv, this);
        } catch (Exception ex) {
            ex.printStackTrace();
            System.out.println("Server: Error publishing the module");
        }
    }

    // By implementing PipeMsgListener, we define this method to deal with
    // messages as they occur
    public void pipeMsgEvent(PipeMsgEvent event) {
        Message msg = null;

        try {
            msg = event.getMessage();

            if (msg == null) {
                return;
            }
        } catch (Exception e) {
            e.printStackTrace();

            return;
        }

        // Get message
        String commandID = msg.getString(COMMAND);
        String broadcastPipeString = msg.getString("BroadcastPipe");

        if (broadcastPipeString != null) {
            try {
                InputStream is = new ByteArrayInputStream(broadcastPipeString.getBytes());
                PipeAdvertisement broadcastPipeAdv = (PipeAdvertisement) AdvertisementFactory.newAdvertisement(new MimeMediaType(
                            "text/xml"), is);
                broadcastPipe = pipeSvc.createOutputPipe(broadcastPipeAdv, 10000);

                System.out.println("broadcast pipe advertisement received: " +
                    broadcastPipeAdv.getName());
            } catch (IOException ex) {
                ex.printStackTrace();
            }

            return;
        }

        if (commandID == null) {
            System.out.println("msg received is null");
        } else {
            try {
                if (broadcastPipe != null) {
                    msg = pipeSvc.createMessage();
                    msg.setString("ACK", commandID);

                    // send the message to the service pipe
                    broadcastPipe.send(msg);
                }

                System.out.println("Received command: " + commandID +
                    " for transcription: " + transcription.getName());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        CommandAction ca = ELANCommandFactory.getCommandAction(transcription,
                commandID);

        if (ca != null) {
            ca.externalCommand(null, null);
        } else {
            System.out.println("no command could be retrieved for received msg");
        }
    }

    private PeerGroup createGroup() {
        PeerGroup pg; // new peer group
        PeerGroupAdvertisement adv; // advertisement for the new peer group

        System.out.println("Creating a new group advertisement");

        try {
            // create a new all purpose peergroup.
            ModuleImplAdvertisement implAdv = netGroup.getAllPurposePeerGroupImplAdvertisement();

            pg = netGroup.newGroup(null, // Assign new group ID
                    implAdv, // The implem. adv
                    transcription.getName(), // The name
                    "testing group adv"); // Helpful descr.

            // print the name of the group and the peer group ID
            adv = pg.getPeerGroupAdvertisement();

            PeerGroupID GID = adv.getPeerGroupID();
            System.out.println("  Group = " + adv.getName() +
                "\n  Group ID = " + GID.toString());
        } catch (Exception eee) {
            System.out.println("Group creation failed with " + eee.toString());

            return (null);
        }

        try {
            // publish this advertisement
            // (send out to other peers/rendezvous peers)
            netDiscoSvc.remotePublish(adv, DiscoveryService.GROUP);
            System.out.println("Group published successfully.\n");
        } catch (Exception e) {
            System.out.println("Error publishing group advertisement");
            e.printStackTrace();

            return (null);
        }

        return (pg);
    }

    private void joinGroup(PeerGroup grp) {
        System.out.println("Joining peer group...");

        StructuredDocument creds = null;

        try {
            // Generate the credentials for the Peer Group
            AuthenticationCredential authCred = new AuthenticationCredential(grp,
                    null, creds);

            // Get the MembershipService from the peer group
            MembershipService membership = grp.getMembershipService();

            // Get the Authenticator from the Authentication creds
            Authenticator auth = membership.apply(authCred);

            // Check if everything is okay to join the group
            if (auth.isReadyForJoin()) {
                Credential myCred = membership.join(auth);

                // what do I do with the credential it returns?
                System.out.println("Successfully joined group " +
                    grp.getPeerGroupName());

                // display the credential as a plain text document.
                System.out.println("\nCredential: ");

                StructuredTextDocument doc = (StructuredTextDocument) myCred.getDocument(new MimeMediaType(
                            "text/plain"));

                StringWriter out = new StringWriter();
                doc.sendToWriter(out);
                System.out.println(out.toString());
                out.close();
            } else {
                System.out.println("Failure: unable to join group");
            }
        } catch (Exception e) {
            System.out.println("Failure in authentication.");
            e.printStackTrace();
        }
    }
}