peergroupfactory.java

JXTA&#8482 is a set of open, generalized peer-to-peer (P2P) protocols that allow any networked devi

            jxta_home.mkdirs();
            URI defaultHome = jxta_home.toURI();

            return defaultHome;
        }

        return storeHome;
    }

    /**
     * Set the location which will serve as the parent for all stored items used by JXTA.
     *
     * @param newHome The absolute URI location which will serve as the parent
     *                for all stored items used by JXTA. Currently this must be a non-opaque URI.
     *                May also be {@code null} to restore the default value.
     * @deprecated Consider converting to use {@link NetPeerGroupFactory} and/or {@link WorldPeerGroupFactory}.
     */
    @Deprecated
    public static void setStoreHome(URI newHome) {

        if (null != newHome) {
            // Fail if the URI is not absolute.
            if (!newHome.isAbsolute()) {
                throw new IllegalArgumentException("Only absolute URIs accepted for store home location.");
            }

            // Fail if the URI is Opaque.
            if (newHome.isOpaque()) {
                throw new IllegalArgumentException("Only hierarchical URIs accepted for store home location.");
            }

            // Add a trailing slash if necessary. 
            if (!newHome.toString().endsWith("/")) {
                newHome = URI.create(newHome.toString() + "/");
            }
        }

        storeHome = newHome;
    }

    /**
     * Static Method to create a new peer group instance.
     * <p/>
     * After being created the init() method needs to be called, and
     * the startApp() method may be called, at the invoker's discretion.
     *
     * @return PeerGroup instance of a new PeerGroup
     * @deprecated This method was previously unused and has been removed with no alternatives. (it wasn't useful)
     */
    @Deprecated
    public static PeerGroup newPeerGroup() {
        throw new UnsupportedOperationException("This feature has been removed. (sorry)");
    }

    /**
     * Instantiates the World (Platform) Peer Group and can also optionally
     * (re)configure the world peer group before instantiation using the
     * configurator specified via {@link #setConfiguratorClass(Class)}.
     * <p/>
     * Only one instance of  the World Peer Group may be created within the
     * context of the {@code PeerGroupFactory}'s class loader. Invoking this
     * method amounts to creating an instance of JXTA.
     * <p/>
     * The {@link PeerGroup#init(PeerGroup,ID,Advertisement)} method is
     * called automatically. The {@link PeerGroup#startApp(String[])} method
     * is left for the invoker to call if appropriate.
     *
     * @return PeerGroup The World Peer Group instance.
     * @throws JxtaError Thrown for all checked Exceptions which occur during
     *                   construction of the World Peer Group.
     * @deprecated Consider converting to use {@link WorldPeerGroupFactory#WorldPeerGroupFactory()}.
     */
    @Deprecated
    public static PeerGroup newPlatform() {

        Class c = PeerGroupFactory.getConfiguratorClass();

        if (null == c) {
            c = NULL_CONFIGURATOR;
        }

        Configurator configurator;

        try {
            Constructor config_constructor = c.getConstructor(URI.class);

            configurator = (Configurator) config_constructor.newInstance(getStoreHome());
        } catch (InvocationTargetException ie) {
            LOG.log(Level.SEVERE, "Uninstantiatable configurator: " + c, ie);

            throw new JxtaError("Uninstantiatable configurator: " + c, ie);
        } catch (NoSuchMethodException ie) {
            LOG.log(Level.SEVERE, "Uninstantiatable configurator: " + c, ie);

            throw new JxtaError("Uninstantiatable configurator: " + c, ie);
        } catch (InstantiationException ie) {
            LOG.log(Level.SEVERE, "Uninstantiatable configurator: " + c, ie);

            throw new JxtaError("Uninstantiatable configurator: " + c, ie);
        } catch (IllegalAccessException iae) {
            LOG.log(Level.SEVERE, "can\'t instantiate configurator: " + c, iae);

            throw new JxtaError("Can't instantiate configurator: " + c, iae);
        } catch (ClassCastException cce) {
            LOG.log(Level.SEVERE, "Not a Configurator :" + c, cce);

            throw new JxtaError("Not a Configurator :" + c, cce);
        }

        ConfigParams pc;

        try {
            pc = configurator.getConfigParams();
        } catch (ConfiguratorException cce) {
            LOG.log(Level.SEVERE, "Could not retrieve configuration", cce);

            throw new JxtaError("Could not retrieve configuration", cce);
        }

        try {
            WorldPeerGroupFactory wpgf;

            if (null == worldGroupClass) {
                wpgf = new WorldPeerGroupFactory(pc, getStoreHome());
            } else {
                wpgf = new WorldPeerGroupFactory(worldGroupClass, pc, getStoreHome());
            }

            configurator.setConfigParams(pc);
            configurator.save();

            // Forget about the configurator
            configurator = null;

            return wpgf.getInterface();
        } catch (RuntimeException e) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "newPlatform failed", e);
            }
            // rethrow
            throw e;
        } catch (Exception e) {
            // should be all other checked exceptions
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "newPlatform failed", e);
            }

            // Simplify exception scheme for caller: any sort of problem wrapped
            // in a PeerGroupException.
            throw new JxtaError("newPlatform failed", e);
        } catch (Error e) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "newPlatform failed", e);
            }
            // rethrow
            throw e;
        }
    }

    /**
     * Instantiates the net peer group using the provided parent peer group.
     *
     * @param ppg The parent group.
     * @return PeerGroup The default netPeerGroup
     * @throws PeerGroupException For failures in constructing the Net Peer Group.
     * @deprecated Consider converting to use {@link NetPeerGroupFactory#NetPeerGroupFactory(PeerGroup,ID,String,XMLElement)}.
     */
    @Deprecated
    public static PeerGroup newNetPeerGroup(PeerGroup ppg) throws PeerGroupException {

        try {
            NetPeerGroupFactory npgf;

            NetPeerGroupFactory.NetGroupTunables tunables;

            if (null == netPGID) {
                // Determine net peer group configuration parameters if they
                // have not already been set.
                tunables = new NetPeerGroupFactory.NetGroupTunables(ResourceBundle.getBundle("net.jxta.impl.config")
                        ,
                        new NetPeerGroupFactory.NetGroupTunables());

                // load overides from "${JXTA_HOME}config.properties".
                URI configPropertiesLocation = getStoreHome().resolve("config.properties");

                try {
                    URLConnection configProperties = configPropertiesLocation.toURL().openConnection();

                    ResourceBundle rsrcs = new PropertyResourceBundle(configProperties.getInputStream());

                    tunables = new NetPeerGroupFactory.NetGroupTunables(rsrcs, tunables);

                    if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
                        LOG.fine("Loaded defaults from " + rsrcs);
                    }
                } catch (MissingResourceException ignored) {
                    ;
                } catch (IOException ignored) {
                    ;
                } catch (Exception ignored) {
                    ;
                }
            } else {
                tunables = new NetPeerGroupFactory.NetGroupTunables(netPGID, netPGName
                        ,
                        (XMLDocument) StructuredDocumentFactory.newStructuredDocument(MimeMediaType.XMLUTF8, "desc", netPGDesc));
            }

            npgf = new NetPeerGroupFactory(ppg, tunables.id, tunables.name, tunables.desc);

            PeerGroup newPg = npgf.getInterface();

            return newPg;
        } catch (PeerGroupException failed) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "newNetPeerGroup failed", failed);
            }
            // rethrow
            throw failed;
        } catch (RuntimeException e) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "newNetPeerGroup failed", e);
            }
            // rethrow
            throw e;
        } catch (Exception e) {
            // should be all other checked exceptions
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "newNetPeerGroup failed", e);
            }
            // Simplify exception scheme for caller: any sort of problem wrapped
            // in a PeerGroupException.
            throw new PeerGroupException("newNetPeerGroup failed", e);
        } catch (Error e) {
            if (Logging.SHOW_SEVERE && LOG.isLoggable(Level.SEVERE)) {
                LOG.log(Level.SEVERE, "newNetPeerGroup failed", e);
            }

            // rethrow
            throw e;
        }
    }

    /**
     * Instantiates the World Peer Group and then instantiates the Net Peer
     * Group. This simplifies the method by which applications can start JXTA.
     *
     * @return The newly instantiated Net Peer Group.
     * @deprecated Consider converting to use {@link NetPeerGroupFactory#NetPeerGroupFactory()}
     *             or preferably one of the other {@code NetPeerGroupFactory} constructors.
     */
    @Deprecated
    public static PeerGroup newNetPeerGroup() throws PeerGroupException {
        // get/create the World Peer Group.
        PeerGroup wpg = getWorldPeerGroup();

        try {
            PeerGroup npg = newNetPeerGroup(wpg);

            return npg;
        } finally {
            wpg.unref();
        }
    }

    /**
     * Retrieves or constructs a new World Peer Group instance suitable for
     * use as the parent for Net Peer Group instances. This implementation
     * makes an important trade-off worth noting; it will use an existing
     * world peer group instance if available and ignore any changes which have
     * been made to the static configuration methods provided by this class.
     *
     * @return The World Peer Group.
     * @throws PeerGroupException For failures in recovering the World Peer Group.
     */
    private static PeerGroup getWorldPeerGroup() throws PeerGroupException {
        synchronized (PeerGroup.globalRegistry) {
            PeerGroup result = PeerGroup.globalRegistry.lookupInstance(PeerGroupID.worldPeerGroupID);

            if (null != result) {
                return result;
            }

            return newPlatform();
        }
    }
}