Examples of javax.naming.Reference

javax.naming.Reference
This class represents a reference to an object that is found outside of the naming/directory system.
Reference provides a way of recording address information about objects which themselves are not directly bound to the naming/directory system.
A Reference consists of an ordered list of addresses and class information about the object being referenced. Each address in the list identifies a communications endpoint for the same conceptual object. The "communications endpoint" is information that indicates how to contact the object. It could be, for example, a network address, a location in memory on the local machine, another process on the same machine, etc. The order of the addresses in the list may be of significance to object factories that interpret the reference.
Multiple addresses may arise for various reasons, such as replication or the object offering interfaces over more than one communication mechanism. The addresses are indexed starting with zero.
A Reference also contains information to assist in creating an instance of the object to which this Reference refers. It contains the class name of that object, and the class name and location of the factory to be used to create the object. The class factory location is a space-separated list of URLs representing the class path used to load the factory. When the factory class (or any class or resource upon which it depends) needs to be loaded, each URL is used (in order) to attempt to load the class.
A Reference instance is not synchronized against concurrent access by multiple threads. Threads that need to access a single Reference concurrently should synchronize amongst themselves and provide the necessary locking. @author Rosanna Lee @author Scott Seligman @see RefAddr @see StringRefAddr @see BinaryRefAddr @since 1.3

        // We only know how to deal with <code>javax.naming.Reference</code>s
        // that specify a class name of "javax.sql.DataSource"
        if ((obj == null) || !(obj instanceof Reference)) {
            return null;
        }
        Reference ref = (Reference) obj;
        if (!"javax.sql.DataSource".equals(ref.getClassName())) {
            return null;
        }


        Properties properties = new Properties();
        for (int i = 0 ; i < ALL_PROPERTIES.length ; i++) {
            String propertyName = ALL_PROPERTIES[i];
            RefAddr ra = ref.get(propertyName);
            if (ra != null) {
                String propertyValue = ra.getContent().toString();
                properties.setProperty(propertyName, propertyValue);
            }
        }

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     * Returns a <code>PerUserPoolDataSource</code> {@link Reference}.
     * 
     * @since 1.2.2
     */
    public Reference getReference() throws NamingException {
        Reference ref = new Reference(getClass().getName(),
                PerUserPoolDataSourceFactory.class.getName(), null);
        ref.add(new StringRefAddr("instanceKey", instanceKey));
        return ref;
    }

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     * Returns a <code>SharedPoolDataSource</code> {@link Reference}.
     * 
     * @since 1.2.2
     */
    public Reference getReference() throws NamingException {
        Reference ref = new Reference(getClass().getName(),
            SharedPoolDataSourceFactory.class.getName(), null);
        ref.add(new StringRefAddr("instanceKey", instanceKey));
        return ref;
    }

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        throws IOException, ClassNotFoundException {
        // The spec says to return null if we can't create an instance
        // of the reference
        Object obj = null;
        if (refObj instanceof Reference) {
            Reference ref = (Reference) refObj;
            if (isCorrectClass(ref.getClassName())) {
                RefAddr ra = ref.get("instanceKey");
                if (ra != null && ra.getContent() != null) {
                    // object was bound to jndi via Referenceable api.
                    obj = instanceMap.get(ra.getContent());
                }
                else

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     */
    public Reference getReference() throws NamingException {
        // this class implements its own factory
        String factory = getClass().getName();
        
        Reference ref = new Reference(getClass().getName(), factory, null);


        ref.add(new StringRefAddr("description", getDescription()));
        ref.add(new StringRefAddr("driver", getDriver()));
        ref.add(new StringRefAddr("loginTimeout", 
                                  String.valueOf(getLoginTimeout())));
        ref.add(new StringRefAddr("password", getPassword()));
        ref.add(new StringRefAddr("user", getUser()));
        ref.add(new StringRefAddr("url", getUrl()));


        ref.add(new StringRefAddr("poolPreparedStatements", 
                                  String.valueOf(isPoolPreparedStatements())));
        ref.add(new StringRefAddr("maxActive", 
                                  String.valueOf(getMaxActive())));
        ref.add(new StringRefAddr("maxIdle", 
                                  String.valueOf(getMaxIdle())));
        ref.add(new StringRefAddr("timeBetweenEvictionRunsMillis", 
            String.valueOf(getTimeBetweenEvictionRunsMillis())));
        ref.add(new StringRefAddr("numTestsPerEvictionRun", 
            String.valueOf(getNumTestsPerEvictionRun())));
        ref.add(new StringRefAddr("minEvictableIdleTimeMillis", 
            String.valueOf(getMinEvictableIdleTimeMillis())));
        ref.add(new StringRefAddr("maxPreparedStatements",
            String.valueOf(getMaxPreparedStatements())));


        return ref;
    }

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            throws Exception {
        // The spec says to return null if we can't create an instance 
        // of the reference
        DriverAdapterCPDS cpds = null;
        if (refObj instanceof Reference) {
            Reference ref = (Reference)refObj;
            if (ref.getClassName().equals(getClass().getName())) {
                RefAddr ra = ref.get("description");
                if (ra != null && ra.getContent() != null) {
                    setDescription(ra.getContent().toString());
                }


                ra = ref.get("driver");
                if (ra != null && ra.getContent() != null) {
                    setDriver(ra.getContent().toString());
                }
                ra = ref.get("url");
                if (ra != null && ra.getContent() != null) {
                    setUrl(ra.getContent().toString());
                }
                ra = ref.get("user");
                if (ra != null && ra.getContent() != null) {
                    setUser(ra.getContent().toString());
                }
                ra = ref.get("password");
                if (ra != null && ra.getContent() != null) {
                    setPassword(ra.getContent().toString());
                }


                ra = ref.get("poolPreparedStatements");
                if (ra != null && ra.getContent() != null) {
                    setPoolPreparedStatements(Boolean.valueOf(
                        ra.getContent().toString()).booleanValue());
                }
                ra = ref.get("maxActive");
                if (ra != null && ra.getContent() != null) {
                    setMaxActive(Integer.parseInt(ra.getContent().toString()));
                }


                ra = ref.get("maxIdle");
                if (ra != null && ra.getContent() != null) {
                    setMaxIdle(Integer.parseInt(ra.getContent().toString()));
                }


                ra = ref.get("timeBetweenEvictionRunsMillis");
                if (ra != null && ra.getContent() != null) {
                    setTimeBetweenEvictionRunsMillis(
                        Integer.parseInt(ra.getContent().toString()));
                }


                ra = ref.get("numTestsPerEvictionRun");
                if (ra != null && ra.getContent() != null) {
                    setNumTestsPerEvictionRun(
                        Integer.parseInt(ra.getContent().toString()));
                }


                ra = ref.get("minEvictableIdleTimeMillis");
                if (ra != null && ra.getContent() != null) {
                    setMinEvictableIdleTimeMillis(
                        Integer.parseInt(ra.getContent().toString()));
                }
                ra = ref.get("maxPreparedStatements");
                if (ra != null && ra.getContent() != null) {
                    setMaxPreparedStatements(
                        Integer.parseInt(ra.getContent().toString()));
                }

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    // version release.
    
    public Reference getReference() throws NamingException {
        final String className = getClass().getName();
        final String factoryName = className + "Factory"; // XXX: not robust 
        Reference ref = new Reference(className, factoryName, null);
        ref.add(new StringRefAddr("instanceKey", instanceKey));
        return ref;
    }

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  doSomething( checkMe );
  System.err.println("\tcreated:   " + checkMe);
  DataSource afterSer = (DataSource) SerializableUtils.testSerializeDeserialize( checkMe );
  doSomething( afterSer );
  System.err.println("\tafter ser: " + afterSer );
  Reference ref = ((Referenceable) checkMe).getReference();
//          System.err.println("ref: " + ref);
//          System.err.println("Factory Class: " + ref.getFactoryClassName());
  DataSource afterRef = (DataSource) ReferenceableUtils.referenceToObject( ref, 
                     null, 
                     null,

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    public void testRefDerefRoundTrip()
    {
  try
      {
        cpds.setIdentityToken("scoop"); //simulate a never-before-seen data source, so it's a new registration on deserialization
    Reference ref = cpds.getReference();
    ComboPooledDataSource unpickled = (ComboPooledDataSource) ReferenceableUtils.referenceToObject( ref, null, null, null );
    assertTrue( "Marshalled and unmarshalled DataSources should have the same properties!", 
          BeansUtils.equalsByAccessibleProperties( cpds, unpickled, EXCLUDE_PROPS ) );
      }
  catch (Exception e)

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        // This ClientBaseDataSource class provides several standard JDBC properties.
        // The names and values of the data source properties are also stored
        // in the reference using the StringRefAddr class.
        // This is all the information needed to reconstruct a ClientBaseDataSource object.


        Reference ref = new Reference(this.getClass().getName(), ClientDataSourceFactory.class.getName(), null);


        addBeanProperties(ref);
        return ref;
    }

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