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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.activemq.transport.amqp.protocol;
import static org.apache.activemq.transport.amqp.AmqpSupport.toLong;
import static org.apache.activemq.transport.amqp.message.AmqpMessageSupport.JMS_AMQP_MESSAGE_FORMAT;
import java.io.IOException;
import java.util.LinkedList;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.activemq.broker.region.AbstractSubscription;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQMessage;
import org.apache.activemq.command.ConsumerControl;
import org.apache.activemq.command.ConsumerId;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.ExceptionResponse;
import org.apache.activemq.command.LocalTransactionId;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.MessageDispatch;
import org.apache.activemq.command.MessagePull;
import org.apache.activemq.command.RemoveInfo;
import org.apache.activemq.command.RemoveSubscriptionInfo;
import org.apache.activemq.command.Response;
import org.apache.activemq.command.TransactionId;
import org.apache.activemq.transport.amqp.AmqpProtocolConverter;
import org.apache.activemq.transport.amqp.ResponseHandler;
import org.apache.activemq.transport.amqp.message.AutoOutboundTransformer;
import org.apache.activemq.transport.amqp.message.EncodedMessage;
import org.apache.activemq.transport.amqp.message.OutboundTransformer;
import org.apache.qpid.proton.amqp.messaging.Accepted;
import org.apache.qpid.proton.amqp.messaging.Modified;
import org.apache.qpid.proton.amqp.messaging.Outcome;
import org.apache.qpid.proton.amqp.messaging.Rejected;
import org.apache.qpid.proton.amqp.messaging.Released;
import org.apache.qpid.proton.amqp.transaction.TransactionalState;
import org.apache.qpid.proton.amqp.transport.AmqpError;
import org.apache.qpid.proton.amqp.transport.DeliveryState;
import org.apache.qpid.proton.amqp.transport.ErrorCondition;
import org.apache.qpid.proton.amqp.transport.SenderSettleMode;
import org.apache.qpid.proton.engine.Delivery;
import org.apache.qpid.proton.engine.Link;
import org.apache.qpid.proton.engine.Sender;
import org.fusesource.hawtbuf.Buffer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An AmqpSender wraps the AMQP Sender end of a link from the remote peer
* which holds the corresponding Receiver which receives messages transfered
* across the link from the Broker.
*
* An AmqpSender is in turn a message consumer subscribed to some destination
* on the broker. As messages are dispatched to this sender that are sent on
* to the remote Receiver end of the lin.
*/
public class AmqpSender extends AmqpAbstractLink {
private static final Logger LOG = LoggerFactory.getLogger(AmqpSender.class);
private static final byte[] EMPTY_BYTE_ARRAY = new byte[] {};
private final OutboundTransformer outboundTransformer = new AutoOutboundTransformer();
private final AmqpTransferTagGenerator tagCache = new AmqpTransferTagGenerator();
private final LinkedList outbound = new LinkedList();
private final LinkedList dispatchedInTx = new LinkedList();
private final ConsumerInfo consumerInfo;
private AbstractSubscription subscription;
private AtomicInteger prefetchExtension;
private int currentCreditRequest;
private int logicalDeliveryCount; // echoes prefetch extension but from protons perspective
private final boolean presettle;
private boolean draining;
private long lastDeliveredSequenceId;
private Buffer currentBuffer;
private Delivery currentDelivery;
/**
* Creates a new AmqpSender instance that manages the given Sender
*
* @param session
* the AmqpSession object that is the parent of this instance.
* @param endpoint
* the AMQP Sender instance that this class manages.
* @param consumerInfo
* the ConsumerInfo instance that holds configuration for this sender.
*/
public AmqpSender(AmqpSession session, Sender endpoint, ConsumerInfo consumerInfo) {
super(session, endpoint);
this.consumerInfo = consumerInfo;
this.presettle = getEndpoint().getRemoteSenderSettleMode() == SenderSettleMode.SETTLED;
}
@Override
public void open() {
if (!isClosed()) {
session.registerSender(getConsumerId(), this);
subscription = (AbstractSubscription)session.getConnection().lookupPrefetchSubscription(consumerInfo);
prefetchExtension = subscription.getPrefetchExtension();
}
super.open();
}
@Override
public void detach() {
if (!isClosed() && isOpened()) {
RemoveInfo removeCommand = new RemoveInfo(getConsumerId());
removeCommand.setLastDeliveredSequenceId(lastDeliveredSequenceId);
sendToActiveMQ(removeCommand, new ResponseHandler() {
@Override
public void onResponse(AmqpProtocolConverter converter, Response response) throws IOException {
session.unregisterSender(getConsumerId());
AmqpSender.super.detach();
}
});
} else {
super.detach();
}
}
@Override
public void close() {
if (!isClosed() && isOpened()) {
RemoveInfo removeCommand = new RemoveInfo(getConsumerId());
removeCommand.setLastDeliveredSequenceId(lastDeliveredSequenceId);
sendToActiveMQ(removeCommand, new ResponseHandler() {
@Override
public void onResponse(AmqpProtocolConverter converter, Response response) throws IOException {
if (consumerInfo.isDurable()) {
RemoveSubscriptionInfo rsi = new RemoveSubscriptionInfo();
rsi.setConnectionId(session.getConnection().getConnectionId());
rsi.setSubscriptionName(getEndpoint().getName());
rsi.setClientId(session.getConnection().getClientId());
sendToActiveMQ(rsi);
}
session.unregisterSender(getConsumerId());
AmqpSender.super.close();
}
});
} else {
super.close();
}
}
@Override
public void flow() throws Exception {
Link endpoint = getEndpoint();
if (LOG.isTraceEnabled()) {
LOG.trace("Flow: draining={}, drain={} credit={}, currentCredit={}, senderDeliveryCount={} - Sub={}",
draining, endpoint.getDrain(),
endpoint.getCredit(), currentCreditRequest, logicalDeliveryCount, subscription);
}
final int endpointCredit = endpoint.getCredit();
if (endpoint.getDrain() && !draining) {
if (endpointCredit > 0) {
draining = true;
// Now request dispatch of the drain amount, we request immediate
// timeout and an completion message regardless so that we can know
// when we should marked the link as drained.
MessagePull pullRequest = new MessagePull();
pullRequest.setConsumerId(getConsumerId());
pullRequest.setDestination(getDestination());
pullRequest.setTimeout(-1);
pullRequest.setAlwaysSignalDone(true);
pullRequest.setQuantity(endpointCredit);
LOG.trace("Pull case -> consumer pull request quantity = {}", endpointCredit);
sendToActiveMQ(pullRequest);
} else {
LOG.trace("Pull case -> sending any Queued messages and marking drained");
pumpOutbound();
getEndpoint().drained();
session.pumpProtonToSocket();
currentCreditRequest = 0;
logicalDeliveryCount = 0;
}
} else if (endpointCredit >= 0) {
if (endpointCredit == 0 && currentCreditRequest != 0) {
prefetchExtension.set(0);
currentCreditRequest = 0;
logicalDeliveryCount = 0;
LOG.trace("Flow: credit 0 for sub:" + subscription);
} else {
int deltaToAdd = endpointCredit;
int logicalCredit = currentCreditRequest - logicalDeliveryCount;
if (logicalCredit > 0) {
deltaToAdd -= logicalCredit;
} else {
// reset delivery counter - dispatch from broker concurrent with credit=0
// flow can go negative
logicalDeliveryCount = 0;
}
if (deltaToAdd > 0) {
currentCreditRequest = prefetchExtension.addAndGet(deltaToAdd);
subscription.wakeupDestinationsForDispatch();
// force dispatch of matched/pending for topics (pending messages accumulate
// in the sub and are dispatched on update of prefetch)
subscription.setPrefetchSize(0);
LOG.trace("Flow: credit addition of {} for sub {}", deltaToAdd, subscription);
}
}
}
}
@Override
public void delivery(Delivery delivery) throws Exception {
MessageDispatch md = (MessageDispatch) delivery.getContext();
DeliveryState state = delivery.getRemoteState();
if (state instanceof TransactionalState) {
TransactionalState txState = (TransactionalState) state;
LOG.trace("onDelivery: TX delivery state = {}", state);
if (txState.getOutcome() != null) {
Outcome outcome = txState.getOutcome();
if (outcome instanceof Accepted) {
TransactionId txId = new LocalTransactionId(session.getConnection().getConnectionId(), toLong(txState.getTxnId()));
// Store the message sent in this TX we might need to re-send on rollback
// and we need to ACK it on commit.
session.enlist(txId);
dispatchedInTx.addFirst(delivery);
if (!delivery.remotelySettled()) {
TransactionalState txAccepted = new TransactionalState();
txAccepted.setOutcome(Accepted.getInstance());
txAccepted.setTxnId(txState.getTxnId());
delivery.disposition(txAccepted);
}
}
}
} else {
if (state instanceof Accepted) {
LOG.trace("onDelivery: accepted state = {}", state);
if (!delivery.remotelySettled()) {
delivery.disposition(new Accepted());
}
settle(delivery, MessageAck.INDIVIDUAL_ACK_TYPE);
} else if (state instanceof Rejected) {
// Rejection is a terminal outcome, we poison the message for dispatch to
// the DLQ. If a custom redelivery policy is used on the broker the message
// can still be redelivered based on the configation of that policy.
LOG.trace("onDelivery: Rejected state = {}, message poisoned.", state, md.getRedeliveryCounter());
settle(delivery, MessageAck.POSION_ACK_TYPE);
} else if (state instanceof Released) {
LOG.trace("onDelivery: Released state = {}", state);
// re-deliver && don't increment the counter.
settle(delivery, -1);
} else if (state instanceof Modified) {
Modified modified = (Modified) state;
if (Boolean.TRUE.equals(modified.getDeliveryFailed())) {
// increment delivery counter..
md.setRedeliveryCounter(md.getRedeliveryCounter() + 1);
}
LOG.trace("onDelivery: Modified state = {}, delivery count now {}", state, md.getRedeliveryCounter());
byte ackType = -1;
Boolean undeliverableHere = modified.getUndeliverableHere();
if (undeliverableHere != null && undeliverableHere) {
// receiver does not want the message..
// perhaps we should DLQ it?
ackType = MessageAck.POSION_ACK_TYPE;
}
settle(delivery, ackType);
}
}
pumpOutbound();
}
@Override
public void commit(LocalTransactionId txnId) throws Exception {
if (!dispatchedInTx.isEmpty()) {
for (final Delivery delivery : dispatchedInTx) {
MessageDispatch dispatch = (MessageDispatch) delivery.getContext();
MessageAck pendingTxAck = new MessageAck(dispatch, MessageAck.INDIVIDUAL_ACK_TYPE, 1);
pendingTxAck.setFirstMessageId(dispatch.getMessage().getMessageId());
pendingTxAck.setTransactionId(txnId);
LOG.trace("Sending commit Ack to ActiveMQ: {}", pendingTxAck);
sendToActiveMQ(pendingTxAck, new ResponseHandler() {
@Override
public void onResponse(AmqpProtocolConverter converter, Response response) throws IOException {
if (response.isException()) {
Throwable exception = ((ExceptionResponse) response).getException();
exception.printStackTrace();
getEndpoint().close();
} else {
delivery.settle();
}
session.pumpProtonToSocket();
}
});
}
dispatchedInTx.clear();
}
}
@Override
public void rollback(LocalTransactionId txnId) throws Exception {
synchronized (outbound) {
LOG.trace("Rolling back {} messages for redelivery. ", dispatchedInTx.size());
for (Delivery delivery : dispatchedInTx) {
// Only settled deliveries should be re-dispatched, unsettled deliveries
// remain acquired on the remote end and can be accepted again in a new
// TX or released or rejected etc.
MessageDispatch dispatch = (MessageDispatch) delivery.getContext();
dispatch.getMessage().setTransactionId(null);
if (delivery.remotelySettled()) {
dispatch.setRedeliveryCounter(dispatch.getRedeliveryCounter() + 1);
outbound.addFirst(dispatch);
}
}
dispatchedInTx.clear();
}
}
/**
* Event point for incoming message from ActiveMQ on this Sender's
* corresponding subscription.
*
* @param dispatch
* the MessageDispatch to process and send across the link.
*
* @throws Exception if an error occurs while encoding the message for send.
*/
public void onMessageDispatch(MessageDispatch dispatch) throws Exception {
if (!isClosed()) {
// Lock to prevent stepping on TX redelivery
synchronized (outbound) {
outbound.addLast(dispatch);
}
pumpOutbound();
session.pumpProtonToSocket();
}
}
/**
* Called when the Broker sends a ConsumerControl command to the Consumer that
* this sender creates to obtain messages to dispatch via the sender for this
* end of the open link.
*
* @param control
* The ConsumerControl command to process.
*/
public void onConsumerControl(ConsumerControl control) {
if (control.isClose()) {
close(new ErrorCondition(AmqpError.INTERNAL_ERROR, "Receiver forcably closed"));
session.pumpProtonToSocket();
}
}
@Override
public String toString() {
return "AmqpSender {" + getConsumerId() + "}";
}
//----- Property getters and setters -------------------------------------//
public ConsumerId getConsumerId() {
return consumerInfo.getConsumerId();
}
@Override
public ActiveMQDestination getDestination() {
return consumerInfo.getDestination();
}
@Override
public void setDestination(ActiveMQDestination destination) {
consumerInfo.setDestination(destination);
}
//----- Internal Implementation ------------------------------------------//
public void pumpOutbound() throws Exception {
while (!isClosed()) {
while (currentBuffer != null) {
int sent = getEndpoint().send(currentBuffer.data, currentBuffer.offset, currentBuffer.length);
if (sent > 0) {
currentBuffer.moveHead(sent);
if (currentBuffer.length == 0) {
if (presettle) {
settle(currentDelivery, MessageAck.INDIVIDUAL_ACK_TYPE);
} else {
getEndpoint().advance();
}
currentBuffer = null;
currentDelivery = null;
logicalDeliveryCount++;
}
} else {
return;
}
}
if (outbound.isEmpty()) {
return;
}
final MessageDispatch md = outbound.removeFirst();
try {
ActiveMQMessage temp = null;
if (md.getMessage() != null) {
// Topics can dispatch the same Message to more than one consumer
// so we must copy to prevent concurrent read / write to the same
// message object.
if (md.getDestination().isTopic()) {
synchronized (md.getMessage()) {
temp = (ActiveMQMessage) md.getMessage().copy();
}
} else {
temp = (ActiveMQMessage) md.getMessage();
}
if (!temp.getProperties().containsKey(JMS_AMQP_MESSAGE_FORMAT)) {
temp.setProperty(JMS_AMQP_MESSAGE_FORMAT, 0);
}
}
final ActiveMQMessage jms = temp;
if (jms == null) {
LOG.trace("Sender:[{}] browse done.", getEndpoint().getName());
// It's the end of browse signal in response to a MessagePull
getEndpoint().drained();
draining = false;
currentCreditRequest = 0;
logicalDeliveryCount = 0;
} else {
if (LOG.isTraceEnabled()) {
LOG.trace("Sender:[{}] msgId={} draining={}, drain={}, credit={}, remoteCredit={}, queued={}",
getEndpoint().getName(), jms.getJMSMessageID(), draining, getEndpoint().getDrain(),
getEndpoint().getCredit(), getEndpoint().getRemoteCredit(), getEndpoint().getQueued());
}
if (draining && getEndpoint().getCredit() == 0) {
LOG.trace("Sender:[{}] browse complete.", getEndpoint().getName());
getEndpoint().drained();
draining = false;
currentCreditRequest = 0;
logicalDeliveryCount = 0;
}
jms.setRedeliveryCounter(md.getRedeliveryCounter());
jms.setReadOnlyBody(true);
final EncodedMessage amqp = outboundTransformer.transform(jms);
if (amqp != null && amqp.getLength() > 0) {
currentBuffer = new Buffer(amqp.getArray(), amqp.getArrayOffset(), amqp.getLength());
if (presettle) {
currentDelivery = getEndpoint().delivery(EMPTY_BYTE_ARRAY, 0, 0);
} else {
final byte[] tag = tagCache.getNextTag();
currentDelivery = getEndpoint().delivery(tag, 0, tag.length);
}
currentDelivery.setContext(md);
currentDelivery.setMessageFormat((int) amqp.getMessageFormat());
} else {
// TODO: message could not be generated what now?
}
}
} catch (Exception e) {
LOG.warn("Error detected while flushing outbound messages: {}", e.getMessage());
}
}
}
private void settle(final Delivery delivery, final int ackType) throws Exception {
byte[] tag = delivery.getTag();
if (tag != null && tag.length > 0 && delivery.remotelySettled()) {
tagCache.returnTag(tag);
}
if (ackType == -1) {
// we are going to settle, but redeliver.. we we won't yet ack to ActiveMQ
delivery.settle();
onMessageDispatch((MessageDispatch) delivery.getContext());
} else {
MessageDispatch md = (MessageDispatch) delivery.getContext();
lastDeliveredSequenceId = md.getMessage().getMessageId().getBrokerSequenceId();
MessageAck ack = new MessageAck();
ack.setConsumerId(getConsumerId());
ack.setFirstMessageId(md.getMessage().getMessageId());
ack.setLastMessageId(md.getMessage().getMessageId());
ack.setMessageCount(1);
ack.setAckType((byte) ackType);
ack.setDestination(md.getDestination());
LOG.trace("Sending Ack to ActiveMQ: {}", ack);
sendToActiveMQ(ack, new ResponseHandler() {
@Override
public void onResponse(AmqpProtocolConverter converter, Response response) throws IOException {
if (response.isException()) {
if (response.isException()) {
Throwable exception = ((ExceptionResponse) response).getException();
exception.printStackTrace();
getEndpoint().close();
}
} else {
delivery.settle();
}
session.pumpProtonToSocket();
}
});
}
}
}
