/*
* 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.artemis.core.postoffice.impl;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.activemq.artemis.api.core.Message;
import org.apache.activemq.artemis.api.core.SimpleString;
import org.apache.activemq.artemis.core.filter.Filter;
import org.apache.activemq.artemis.core.paging.PagingStore;
import org.apache.activemq.artemis.core.postoffice.Binding;
import org.apache.activemq.artemis.core.postoffice.Bindings;
import org.apache.activemq.artemis.core.server.ActiveMQServerLogger;
import org.apache.activemq.artemis.core.server.Queue;
import org.apache.activemq.artemis.core.server.RoutingContext;
import org.apache.activemq.artemis.core.server.cluster.RemoteQueueBinding;
import org.apache.activemq.artemis.core.server.cluster.impl.MessageLoadBalancingType;
import org.apache.activemq.artemis.core.server.group.GroupingHandler;
import org.apache.activemq.artemis.core.server.group.impl.Proposal;
import org.apache.activemq.artemis.core.server.group.impl.Response;
import org.jboss.logging.Logger;
public final class BindingsImpl implements Bindings {
private static final Logger logger = Logger.getLogger(BindingsImpl.class);
// This is public as we use on test assertions
public static final int MAX_GROUP_RETRY = 10;
private final ConcurrentMap<SimpleString, List<Binding>> routingNameBindingMap = new ConcurrentHashMap<>();
private final Map<SimpleString, Integer> routingNamePositions = new ConcurrentHashMap<>();
private final Map<Long, Binding> bindingsMap = new ConcurrentHashMap<>();
private final List<Binding> exclusiveBindings = new CopyOnWriteArrayList<>();
private volatile MessageLoadBalancingType messageLoadBalancingType = MessageLoadBalancingType.OFF;
private final GroupingHandler groupingHandler;
private final PagingStore pageStore;
private final SimpleString name;
public BindingsImpl(final SimpleString name, final GroupingHandler groupingHandler, final PagingStore pageStore) {
this.groupingHandler = groupingHandler;
this.pageStore = pageStore;
this.name = name;
}
@Override
public void setMessageLoadBalancingType(final MessageLoadBalancingType messageLoadBalancingType) {
this.messageLoadBalancingType = messageLoadBalancingType;
}
@Override
public Collection<Binding> getBindings() {
return bindingsMap.values();
}
@Override
public void unproposed(SimpleString groupID) {
for (Binding binding : bindingsMap.values()) {
binding.unproposed(groupID);
}
}
@Override
public void addBinding(final Binding binding) {
if (logger.isTraceEnabled()) {
logger.trace("addBinding(" + binding + ") being called");
}
if (binding.isExclusive()) {
exclusiveBindings.add(binding);
} else {
SimpleString routingName = binding.getRoutingName();
List<Binding> bindings = routingNameBindingMap.get(routingName);
if (bindings == null) {
bindings = new CopyOnWriteArrayList<>();
List<Binding> oldBindings = routingNameBindingMap.putIfAbsent(routingName, bindings);
if (oldBindings != null) {
bindings = oldBindings;
}
}
if (!bindings.contains(binding)) {
bindings.add(binding);
}
}
bindingsMap.put(binding.getID(), binding);
if (logger.isTraceEnabled()) {
logger.trace("Adding binding " + binding + " into " + this + " bindingTable: " + debugBindings());
}
}
@Override
public void removeBinding(final Binding binding) {
if (binding.isExclusive()) {
exclusiveBindings.remove(binding);
} else {
SimpleString routingName = binding.getRoutingName();
List<Binding> bindings = routingNameBindingMap.get(routingName);
if (bindings != null) {
bindings.remove(binding);
if (bindings.isEmpty()) {
routingNameBindingMap.remove(routingName);
}
}
}
bindingsMap.remove(binding.getID());
if (logger.isTraceEnabled()) {
logger.trace("Removing binding " + binding + " from " + this + " bindingTable: " + debugBindings());
}
}
@Override
public boolean redistribute(final Message message,
final Queue originatingQueue,
final RoutingContext context) throws Exception {
if (messageLoadBalancingType.equals(MessageLoadBalancingType.STRICT) || messageLoadBalancingType.equals(MessageLoadBalancingType.OFF)) {
return false;
}
if (logger.isTraceEnabled()) {
logger.trace("Redistributing message " + message);
}
SimpleString routingName = originatingQueue.getName();
List<Binding> bindings = routingNameBindingMap.get(routingName);
if (bindings == null) {
// The value can become null if it's concurrently removed while we're iterating - this is expected
// ConcurrentHashMap behaviour!
return false;
}
Integer ipos = routingNamePositions.get(routingName);
int pos = ipos != null ? ipos.intValue() : 0;
int length = bindings.size();
int startPos = pos;
Binding theBinding = null;
// TODO - combine this with similar logic in route()
while (true) {
Binding binding;
try {
binding = bindings.get(pos);
} catch (IndexOutOfBoundsException e) {
// This can occur if binding is removed while in route
if (!bindings.isEmpty()) {
pos = 0;
startPos = 0;
length = bindings.size();
continue;
} else {
break;
}
}
pos = incrementPos(pos, length);
Filter filter = binding.getFilter();
boolean highPrior = binding.isHighAcceptPriority(message);
if (highPrior && binding.getBindable() != originatingQueue && (filter == null || filter.match(message))) {
theBinding = binding;
break;
}
if (pos == startPos) {
break;
}
}
routingNamePositions.put(routingName, pos);
if (theBinding != null) {
theBinding.route(message, context);
return true;
} else {
return false;
}
}
@Override
public void route(final Message message, final RoutingContext context) throws Exception {
route(message, context, true);
}
private void route(final Message message,
final RoutingContext context,
final boolean groupRouting) throws Exception {
/* This is a special treatment for scaled-down messages involving SnF queues.
* See org.apache.activemq.artemis.core.server.impl.ScaleDownHandler.scaleDownMessages() for the logic that sends messages with this property
*/
byte[] ids = (byte[]) message.removeAnnotation(Message.HDR_SCALEDOWN_TO_IDS);
if (ids != null) {
ByteBuffer buffer = ByteBuffer.wrap(ids);
while (buffer.hasRemaining()) {
long id = buffer.getLong();
for (Map.Entry<Long, Binding> entry : bindingsMap.entrySet()) {
if (entry.getValue() instanceof RemoteQueueBinding) {
RemoteQueueBinding remoteQueueBinding = (RemoteQueueBinding) entry.getValue();
if (remoteQueueBinding.getRemoteQueueID() == id) {
message.putBytesProperty(Message.HDR_ROUTE_TO_IDS, ByteBuffer.allocate(8).putLong(remoteQueueBinding.getID()).array());
}
}
}
}
}
boolean routed = false;
for (Binding binding : exclusiveBindings) {
if (binding.getFilter() == null || binding.getFilter().match(message)) {
binding.getBindable().route(message, context);
routed = true;
}
}
if (!routed) {
// Remove the ids now, in order to avoid double check
ids = (byte[]) message.removeAnnotation(Message.HDR_ROUTE_TO_IDS);
// Fetch the groupId now, in order to avoid double checking
SimpleString groupId = message.getGroupID();
if (ids != null) {
routeFromCluster(message, context, ids);
} else if (groupingHandler != null && groupRouting && groupId != null) {
routeUsingStrictOrdering(message, context, groupingHandler, groupId, 0);
} else {
if (logger.isTraceEnabled()) {
logger.trace("Routing message " + message + " on binding=" + this);
}
for (Map.Entry<SimpleString, List<Binding>> entry : routingNameBindingMap.entrySet()) {
SimpleString routingName = entry.getKey();
List<Binding> bindings = entry.getValue();
if (bindings == null) {
// The value can become null if it's concurrently removed while we're iterating - this is expected
// ConcurrentHashMap behaviour!
continue;
}
Binding theBinding = getNextBinding(message, routingName, bindings);
if (theBinding != null) {
theBinding.route(message, context);
}
}
}
}
}
@Override
public String toString() {
return "BindingsImpl [name=" + name + "]";
}
/**
* This code has a race on the assigned value to routing names.
* <p>
* This is not that much of an issue because<br>
* Say you have the same queue name bound into two servers. The routing will load balance between
* these two servers. This will eventually send more messages to one server than the other
* (depending if you are using multi-thread), and not lose messages.
*/
private Binding getNextBinding(final Message message,
final SimpleString routingName,
final List<Binding> bindings) {
Integer ipos = routingNamePositions.get(routingName);
int pos = ipos != null ? ipos : 0;
int length = bindings.size();
int startPos = pos;
Binding theBinding = null;
int lastLowPriorityBinding = -1;
while (true) {
Binding binding;
try {
binding = bindings.get(pos);
} catch (IndexOutOfBoundsException e) {
// This can occur if binding is removed while in route
if (!bindings.isEmpty()) {
pos = 0;
startPos = 0;
length = bindings.size();
continue;
} else {
break;
}
}
Filter filter = binding.getFilter();
if (filter == null || filter.match(message)) {
// bindings.length == 1 ==> only a local queue so we don't check for matching consumers (it's an
// unnecessary overhead)
if (length == 1 || (binding.isConnected() && (messageLoadBalancingType.equals(MessageLoadBalancingType.STRICT) || binding.isHighAcceptPriority(message)))) {
theBinding = binding;
pos = incrementPos(pos, length);
break;
} else {
//https://issues.jboss.org/browse/HORNETQ-1254 When !routeWhenNoConsumers,
// the localQueue should always have the priority over the secondary bindings
if (lastLowPriorityBinding == -1 || messageLoadBalancingType.equals(MessageLoadBalancingType.ON_DEMAND) && binding instanceof LocalQueueBinding) {
lastLowPriorityBinding = pos;
}
}
}
pos = incrementPos(pos, length);
if (pos == startPos) {
// if no bindings were found, we will apply a secondary level on the routing logic
if (lastLowPriorityBinding != -1) {
try {
theBinding = bindings.get(lastLowPriorityBinding);
} catch (IndexOutOfBoundsException e) {
// This can occur if binding is removed while in route
if (!bindings.isEmpty()) {
pos = 0;
lastLowPriorityBinding = -1;
continue;
} else {
break;
}
}
pos = incrementPos(lastLowPriorityBinding, length);
}
break;
}
}
if (pos != startPos) {
routingNamePositions.put(routingName, pos);
}
if (messageLoadBalancingType.equals(MessageLoadBalancingType.OFF) && theBinding instanceof RemoteQueueBinding) {
theBinding = getNextBinding(message, routingName, bindings);
}
return theBinding;
}
private void routeUsingStrictOrdering(final Message message,
final RoutingContext context,
final GroupingHandler groupingGroupingHandler,
final SimpleString groupId,
final int tries) throws Exception {
for (Map.Entry<SimpleString, List<Binding>> entry : routingNameBindingMap.entrySet()) {
SimpleString routingName = entry.getKey();
List<Binding> bindings = entry.getValue();
if (bindings == null) {
// The value can become null if it's concurrently removed while we're iterating - this is expected
// ConcurrentHashMap behaviour!
continue;
}
// concat a full group id, this is for when a binding has multiple bindings
// NOTE: In case a dev ever change this rule, QueueImpl::unproposed is using this rule to determine if
// the binding belongs to its Queue before removing it
SimpleString fullID = groupId.concat(".").concat(routingName);
// see if there is already a response
Response resp = groupingGroupingHandler.getProposal(fullID, true);
if (resp == null) {
// ok let's find the next binding to propose
Binding theBinding = getNextBinding(message, routingName, bindings);
if (theBinding == null) {
continue;
}
resp = groupingGroupingHandler.propose(new Proposal(fullID, theBinding.getClusterName()));
if (resp == null) {
logger.debug("it got a timeout on propose, trying again, number of retries: " + tries);
// it timed out, so we will check it through routeAndcheckNull
theBinding = null;
}
// alternativeClusterName will be != null when by the time we looked at the cachedProposed,
// another thread already set the proposal, so we use the new alternativeclusterName that's set there
// if our proposal was declined find the correct binding to use
if (resp != null && resp.getAlternativeClusterName() != null) {
theBinding = locateBinding(resp.getAlternativeClusterName(), bindings);
}
routeAndCheckNull(message, context, resp, theBinding, groupId, tries);
} else {
// ok, we need to find the binding and route it
Binding chosen = locateBinding(resp.getChosenClusterName(), bindings);
routeAndCheckNull(message, context, resp, chosen, groupId, tries);
}
}
}
private Binding locateBinding(SimpleString clusterName, List<Binding> bindings) {
for (Binding binding : bindings) {
if (binding.getClusterName().equals(clusterName)) {
return binding;
}
}
return null;
}
private void routeAndCheckNull(Message message,
RoutingContext context,
Response resp,
Binding theBinding,
SimpleString groupId,
int tries) throws Exception {
// and let's route it
if (theBinding != null) {
theBinding.route(message, context);
} else {
if (resp != null) {
groupingHandler.forceRemove(resp.getGroupId(), resp.getClusterName());
}
//there may be a chance that the binding has been removed from the post office before it is removed from the grouping handler.
//in this case all we can do is remove it and try again.
if (tries < MAX_GROUP_RETRY) {
routeUsingStrictOrdering(message, context, groupingHandler, groupId, tries + 1);
} else {
ActiveMQServerLogger.LOGGER.impossibleToRouteGrouped();
route(message, context, false);
}
}
}
private String debugBindings() {
StringWriter writer = new StringWriter();
PrintWriter out = new PrintWriter(writer);
out.println("\n**************************************************");
out.println("routingNameBindingMap:");
if (routingNameBindingMap.isEmpty()) {
out.println("\tEMPTY!");
}
for (Map.Entry<SimpleString, List<Binding>> entry : routingNameBindingMap.entrySet()) {
out.println("\tkey=" + entry.getKey() + ", value(s):");
for (Binding bind : entry.getValue()) {
out.println("\t\t" + bind);
}
out.println();
}
out.println("routingNamePositions:");
if (routingNamePositions.isEmpty()) {
out.println("\tEMPTY!");
}
for (Map.Entry<SimpleString, Integer> entry : routingNamePositions.entrySet()) {
out.println("\tkey=" + entry.getKey() + ", value=" + entry.getValue());
}
out.println();
out.println("bindingsMap:");
if (bindingsMap.isEmpty()) {
out.println("\tEMPTY!");
}
for (Map.Entry<Long, Binding> entry : bindingsMap.entrySet()) {
out.println("\tkey=" + entry.getKey() + ", value=" + entry.getValue());
}
out.println();
out.println("exclusiveBindings:");
if (exclusiveBindings.isEmpty()) {
out.println("\tEMPTY!");
}
for (Binding binding : exclusiveBindings) {
out.println("\t" + binding);
}
out.println("####################################################");
return writer.toString();
}
private void routeFromCluster(final Message message,
final RoutingContext context,
final byte[] ids) throws Exception {
byte[] idsToAck = (byte[]) message.removeProperty(Message.HDR_ROUTE_TO_ACK_IDS);
List<Long> idsToAckList = new ArrayList<>();
if (idsToAck != null) {
ByteBuffer buff = ByteBuffer.wrap(idsToAck);
while (buff.hasRemaining()) {
long bindingID = buff.getLong();
idsToAckList.add(bindingID);
}
}
ByteBuffer buff = ByteBuffer.wrap(ids);
while (buff.hasRemaining()) {
long bindingID = buff.getLong();
Binding binding = bindingsMap.get(bindingID);
if (binding != null) {
if (idsToAckList.contains(bindingID)) {
binding.routeWithAck(message, context);
} else {
binding.route(message, context);
}
} else {
ActiveMQServerLogger.LOGGER.bindingNotFound(bindingID, message.toString(), this.toString());
}
}
}
private int incrementPos(int pos, final int length) {
pos++;
if (pos == length) {
pos = 0;
}
return pos;
}
public Map<SimpleString, List<Binding>> getRoutingNameBindingMap() {
return routingNameBindingMap;
}
}