Examples of DataChannel

de.netseeker.ejoe.io.DataChannel
Utility class handling all socket oriented data IO on nio channels. DataChannels must be implemented as singletons to avoid creation of a new object for each socket IO operation. Otherwise heavy load could result in fast-growing memory consumption. @author netseeker @since 0.3.9.1
org.apache.cayenne.DataChannel
DataChannel is an abstraction used by ObjectContexts to obtain mapping metadata and access a persistent store. There is rarely a need to use it directly. @since 1.2
org.apache.tajo.engine.planner.global.DataChannel
org.imagearchive.lsm.toolbox.info.scaninfo.DataChannel

Examples of de.netseeker.ejoe.io.DataChannel

    private Object read( SerializeAdapter adapter ) throws IOException
    {
        ByteBufferInputStream in = null;
        ByteBuffer dataBuf = null;
        Object result = null;
        DataChannel dataChannel = DataChannel.getInstance( this._senderInfo );


        try
        {
            if ( !this._senderInfo.hasWaitingBuffer() )
            {
                int length = dataChannel.readHeader( this._senderInfo, EJConstants.EJOE_CONNECTION_TIMEOUT );


                // maybe the DataChannel signals that it has already read
                // partial data
                if ( this._senderInfo.hasWaitingBuffer() )
                {
                    dataBuf = this._senderInfo.getWaitingBuffer();
                }
                else
                {
                    dataBuf = ByteBufferAllocator.allocate( length );
                }


                log.log( Level.FINE, "Going to read client request with length: " + length );
            }
            else
            {
                dataBuf = this._senderInfo.getWaitingBuffer();
            }


            if ( dataBuf.hasRemaining() )
            {
                DataChannel.nonBlockingRead( this._senderInfo.getChannel(), dataBuf );
            }


            dataBuf.flip();


            if ( log.isLoggable( Level.FINE ) )
            {
                byte[] tmp = new byte[dataBuf.remaining()];
                dataBuf.get( tmp );
                dataBuf.position( 0 );
                log.log( Level.FINE, "Client request read:\n" + new String( tmp, EJConstants.EJOE_DEFAULT_CHARSET ) );
            }


            if ( dataBuf.hasRemaining() )
            {
                try
                {
                    // usual way: deserialize using a adapter
                    if ( !this._senderInfo.isDirect() )
                    {
                        dataBuf = dataChannel.decode( dataBuf );
                        in = new ByteBufferInputStream( dataBuf );
                        result = deserialize( adapter, in );
                    }
                    // direct mode: don't deserialize, just copy and return the read
                    // ByteBuffer
                    else
                    {
                        // copy the bytebuffer
                        ByteBuffer tmp = ByteBufferAllocator.allocate( dataBuf.remaining() );
                        tmp.put( dataBuf );
                        tmp.flip();
                        result = dataChannel.decode( tmp );
                    }
                }
                catch ( Throwable t )
                {
                    throw new RemoteException( "Error while preprocessing request!", t );

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Examples of de.netseeker.ejoe.io.DataChannel

     */
    private void send( ConnectionHeader serverInfo, ConnectionHeader clientInfo, SelectionKey selKey, Object obj )
            throws IOException
    {
        ByteBuffer dataBuf = (ByteBuffer) selKey.attachment();
        DataChannel dataChannel = DataChannel.getInstance( serverInfo );
        ByteBufferOutputStream out = null;


        try
        {
            if ( dataBuf == null )
            {
                // usual way: serialize using a adapter
                if ( !clientInfo.isDirect() )
                {
                    out = new ByteBufferOutputStream();
                    serialize( out, obj, clientInfo );
                    dataBuf = out.getBackingBuffer();
                }
                // direct mode: just use the attachement
                else
                {
                    dataBuf = (ByteBuffer) obj;
                }


                if ( dataBuf.position() > 0 )
                {
                    dataBuf.flip();
                }


                if ( log.isLoggable( Level.FINE ) )
                {
                    byte[] tmp = new byte[dataBuf.remaining()];
                    dataBuf.get( tmp );
                    dataBuf.position( 0 );
                    log.log( Level.FINE, "Going to send request..."
                            + new String( tmp, EJConstants.EJOE_DEFAULT_CHARSET ) );
                }


                dataChannel.writeHeader( serverInfo, dataBuf, this._connectionTimeout );
            }


            dataChannel.nonBlockingWrite( _channel, dataBuf );
            log.log( Level.FINE, "Request sent." );
        }
        finally
        {
            IOUtil.closeQuiet( out );

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Examples of de.netseeker.ejoe.io.DataChannel

     * @throws IOException
     */
    private Object receive( ConnectionHeader clientInfo ) throws IOException
    {
        Object result = null;
        DataChannel dataChannel = DataChannel.getInstance( _serverInfo );
        ByteBuffer dataBuf = clientInfo.getWaitingBuffer();
        ByteBufferInputStream in = null;


        try
        {
            if ( dataBuf == null )
            {
                int length = dataChannel.readHeader( _serverInfo, this._connectionTimeout );
                // server signals a null result?
                if ( length == 0 )
                {
                    return null;
                }

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Examples of de.netseeker.ejoe.io.DataChannel

        ByteBufferOutputStream out = null;
        ByteBuffer dataBuf = null;
        SerializeAdapter adapter = this._receiverInfo.getAdapterName() != null ? AdapterFactory
                .createAdapter( this._receiverInfo.getAdapterName() ) : null;
        WritableByteChannel channel = this._receiverInfo.getChannel();
        DataChannel dataChannel = DataChannel.getInstance( this._receiverInfo );


        try
        {
            if ( this._receiverInfo.hasAttachment() )
            {
                // usual way: convert the serialized object to a ByteBuffer
                if ( !this._receiverInfo.isDirect() )
                {
                    out = new ByteBufferOutputStream();
                    serialize( adapter, out );
                    dataBuf = out.getBackingBuffer();
                }
                // direct mode: just use the attachement
                else
                {
                    ByteBuffer tmp = (ByteBuffer) this._receiverInfo.getAttachment();
                    if ( tmp.position() > 0 )
                    {
                        tmp.flip();
                    }
                    dataBuf = tmp.duplicate();
                    ByteBufferAllocator.collect( tmp );
                }


                if ( dataBuf.position() > 0 )
                {
                    dataBuf.flip();
                }


                this._receiverInfo.releaseAttachment();


                dataChannel.writeHeader( this._receiverInfo, dataBuf, EJConstants.EJOE_CONNECTION_TIMEOUT );


                if ( log.isLoggable( Level.FINE ) )
                {
                    byte[] tmp = new byte[dataBuf.remaining()];
                    dataBuf.get( tmp );
                    dataBuf.position( 0 );
                    log.log( Level.FINE, "Going to send server response:\n"
                            + new String( tmp, EJConstants.EJOE_DEFAULT_CHARSET ) );
                }


                dataChannel.nonBlockingWrite( channel, dataBuf );
            }
            else if ( this._receiverInfo.hasWaitingBuffer() )
            {
                dataBuf = this._receiverInfo.getWaitingBuffer();
                dataChannel.nonBlockingWrite( channel, dataBuf );
            }
            // seems that we have no answer for the client
            else
            {
                dataChannel.writeHeader( this._receiverInfo, null, EJConstants.EJOE_CONNECTION_TIMEOUT );
            }


            log.log( Level.FINE, "Server response sent." );
        }
        finally

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Examples of org.apache.cayenne.DataChannel

    @Override
    protected ServerSession createServerSession() {


        HttpSession httpSession = getSession(true);


        DataChannel channel = createChannel();
        RemoteSession remoteSession = createRemoteSession(
                httpSession.getId(),
                null,
                false);
        ServerSession serverSession = new ServerSession(remoteSession, channel);

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Examples of org.apache.cayenne.DataChannel

        if (name == null) {
            throw new IllegalArgumentException("Name is null for shared session.");
        }


        HttpSession httpSession = getSession(true);
        DataChannel channel;


        synchronized (sharedChannels) {
            channel = getSharedChannel(name);
            if (channel == null) {
                channel = createChannel();

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Examples of org.apache.cayenne.DataChannel

    @Inject
    protected DbAdapter adapter;


    public DBHelper get() throws ConfigurationException {


        DataChannel channel = serverRuntimeProvider.get().getChannel();
        DataMap firstMap = channel.getEntityResolver().getDataMaps().iterator().next();
        return new FlavoredDBHelper(dataSource, adapter.getQuotingStrategy(firstMap
                .isQuotingSQLIdentifiers()));
    }

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Examples of org.apache.cayenne.DataChannel

        assertTrue(configured[0]);
        assertTrue(configured[1]);
    }


    public void testGetDataChannel_CustomModule() {
        final DataChannel channel = new DataChannel() {


            public EntityResolver getEntityResolver() {
                return null;
            }

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Examples of org.apache.cayenne.DataChannel

            }
        };


        Injector injector = DIBootstrap.createInjector(module);


        DataChannel channel = injector.getInstance(DataChannel.class);
        assertNotNull(channel);
        assertTrue(channel instanceof ClientChannel);
        assertSame("DataChannel must be a singleton", channel, injector
                .getInstance(DataChannel.class));

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Examples of org.apache.cayenne.DataChannel

            }
        };


        Injector injector = DIBootstrap.createInjector(module);


        DataChannel channel = injector.getInstance(DataChannel.class);
        ClientChannel clientChannel = (ClientChannel) channel;
        assertTrue(clientChannel.isChannelEventsEnabled());
    }

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