org.hornetq.amqp.dealer.protonimpl.AbstractProtonSender.java Source code

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Here is the source code for org.hornetq.amqp.dealer.protonimpl.AbstractProtonSender.java

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/*
 * Copyright 2005-2014 Red Hat, Inc.
 * Red Hat licenses this file to you under the Apache License, version
 * 2.0 (the "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *    http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 */

package org.hornetq.amqp.dealer.protonimpl;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.PooledByteBufAllocator;
import org.apache.qpid.proton.amqp.transport.SenderSettleMode;
import org.apache.qpid.proton.engine.Delivery;
import org.apache.qpid.proton.engine.Sender;
import org.apache.qpid.proton.message.ProtonJMessage;
import org.hornetq.amqp.dealer.exceptions.HornetQAMQPException;
import org.hornetq.amqp.dealer.spi.ProtonSessionSPI;
import org.hornetq.amqp.dealer.util.CreditsSemaphore;
import org.hornetq.amqp.dealer.util.NettyWritable;

/**
 * A this is a wrapper around a HornetQ ServerConsumer for handling outgoing messages and incoming acks via a Proton Sender
 *
 * @author <a href="mailto:andy.taylor@jboss.org">Andy Taylor</a>
 */
public abstract class AbstractProtonSender extends ProtonInitializable implements ProtonDeliveryHandler {
    protected final ProtonSession protonSession;
    protected final Sender sender;
    protected final ProtonAbstractConnectionImpl connection;
    protected boolean closed = false;
    protected final ProtonSessionSPI sessionSPI;
    protected CreditsSemaphore creditsSemaphore = new CreditsSemaphore(0);

    public AbstractProtonSender(ProtonAbstractConnectionImpl connection, Sender sender, ProtonSession protonSession,
            ProtonSessionSPI server) {
        this.connection = connection;
        this.sender = sender;
        this.protonSession = protonSession;
        this.sessionSPI = server;
    }

    public void onFlow(int credits) {
        this.creditsSemaphore.setCredits(credits);
    }

    /*
    * start the session
    * */
    public void start() throws HornetQAMQPException {
        sessionSPI.start();
        // protonSession.getServerSession().start();
    }

    /*
    * close the session
    * */
    public void close() throws HornetQAMQPException {
        closed = true;
        protonSession.removeSender(sender);
        synchronized (connection.getTrio().getLock()) {
            sender.close();
        }

        connection.getTrio().dispatch();
    }

    @Override
    /*
    * handle an incoming Ack from Proton, basically pass to HornetQ to handle
    * */
    public abstract void onMessage(Delivery delivery) throws HornetQAMQPException;

    /*
    * check the state of the consumer, i.e. are there any more messages. only really needed for browsers?
    * */
    public void checkState() {
    }

    public Sender getSender() {
        return sender;
    }

    protected int performSend(ProtonJMessage serverMessage, Object context) {
        if (!creditsSemaphore.tryAcquire()) {
            try {
                creditsSemaphore.acquire();
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
                // nothing to be done here.. we just keep going
                throw new IllegalStateException(e.getMessage(), e);
            }
        }

        //presettle means we can ack the message on the dealer side before we send it, i.e. for browsers
        boolean preSettle = sender.getRemoteSenderSettleMode() == SenderSettleMode.SETTLED;

        //we only need a tag if we are going to ack later
        byte[] tag = preSettle ? new byte[0] : protonSession.getTag();

        ByteBuf nettyBuffer = PooledByteBufAllocator.DEFAULT.heapBuffer(1024);
        try {
            serverMessage.encode(new NettyWritable(nettyBuffer));

            int size = nettyBuffer.writerIndex();

            synchronized (connection.getTrio().getLock()) {
                final Delivery delivery;
                delivery = sender.delivery(tag, 0, tag.length);
                delivery.setContext(context);

                // this will avoid a copy.. patch provided by Norman using buffer.array()
                sender.send(nettyBuffer.array(), nettyBuffer.arrayOffset() + nettyBuffer.readerIndex(),
                        nettyBuffer.readableBytes());

                if (preSettle) {
                    delivery.settle();
                } else {
                    sender.advance();
                }
            }

            connection.flush();

            return size;
        } finally {
            nettyBuffer.release();
        }
    }
}