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The RabbitMQ AMQP 1.0 Java client library defines an API to access RabbitMQ
with the AMQP 1.0 protocol.
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// Copyright (c) 2024 Broadcom. All Rights Reserved.
// The term "Broadcom" refers to Broadcom Inc. and/or its subsidiaries.
//
// Licensed 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.
//
// If you have any questions regarding licensing, please contact us at
// [email protected].
package com.rabbitmq.client.amqp.impl;
import static com.rabbitmq.client.amqp.Resource.State.*;
import com.rabbitmq.client.amqp.*;
import com.rabbitmq.client.amqp.ObservationCollector;
import com.rabbitmq.client.amqp.impl.Utils.StopWatch;
import com.rabbitmq.client.amqp.metrics.MetricsCollector;
import java.time.Duration;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.BiConsumer;
import java.util.function.Predicate;
import java.util.function.Supplier;
import org.apache.qpid.protonj2.client.ConnectionOptions;
import org.apache.qpid.protonj2.client.DisconnectionEvent;
import org.apache.qpid.protonj2.client.Session;
import org.apache.qpid.protonj2.client.SslOptions;
import org.apache.qpid.protonj2.client.exceptions.ClientException;
import org.apache.qpid.protonj2.client.exceptions.ClientIOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
final class AmqpConnection extends ResourceBase implements Connection {
private static final Predicate RECOVERY_PREDICATE =
t -> t instanceof AmqpException.AmqpConnectionException;
private static final AtomicLong ID_SEQUENCE = new AtomicLong(0);
private static final Logger LOGGER = LoggerFactory.getLogger(AmqpConnection.class);
private final long id;
private final AmqpEnvironment environment;
private final AmqpManagement management;
private volatile org.apache.qpid.protonj2.client.Connection nativeConnection;
private volatile Address connectionAddress;
private volatile String connectionNodename;
private final AtomicBoolean closed = new AtomicBoolean(false);
private volatile Session nativeSession;
private final List publishers = new CopyOnWriteArrayList<>();
private final List consumers = new CopyOnWriteArrayList<>();
private final List rpcClients = new CopyOnWriteArrayList<>();
private final List rpcServers = new CopyOnWriteArrayList<>();
private final TopologyListener topologyListener;
private volatile EntityRecovery entityRecovery;
private final AtomicBoolean recoveringConnection = new AtomicBoolean(false);
private final DefaultConnectionSettings connectionSettings;
private final Supplier sessionHandlerSupplier;
private final ConnectionUtils.AffinityContext affinity;
private final ConnectionSettings.AffinityStrategy affinityStrategy;
private final String name;
private final Lock instanceLock = new ReentrantLock();
AmqpConnection(AmqpConnectionBuilder builder) {
super(builder.listeners());
this.id = ID_SEQUENCE.getAndIncrement();
this.name = builder.name();
this.environment = builder.environment();
this.connectionSettings = builder.connectionSettings().consolidate();
this.sessionHandlerSupplier =
builder.isolateResources()
? () -> new SessionHandler.SingleSessionSessionHandler(this)
: () -> new SessionHandler.ConnectionNativeSessionSessionHandler(this);
BiConsumer disconnectHandler;
AmqpConnectionBuilder.AmqpRecoveryConfiguration recoveryConfiguration =
builder.recoveryConfiguration();
this.topologyListener = createTopologyListener(builder);
if (recoveryConfiguration.activated()) {
disconnectHandler = recoveryDisconnectHandler(recoveryConfiguration, builder.name());
} else {
disconnectHandler =
(c, e) -> {
AmqpException failureCause =
ExceptionUtils.convert(e.failureCause(), "Connection disconnected");
this.close(failureCause);
};
}
if (this.connectionSettings.affinity().activated()) {
this.affinity =
new ConnectionUtils.AffinityContext(
this.connectionSettings.affinity().queue(),
this.connectionSettings.affinity().operation());
this.affinityStrategy = connectionSettings.affinity().strategy();
} else {
this.affinity = null;
this.affinityStrategy = null;
}
this.management = createManagement();
LOGGER.debug("Opening native connection for connection '{}'...", this.name());
NativeConnectionWrapper ncw =
ConnectionUtils.enforceAffinity(
addrs -> {
NativeConnectionWrapper wrapper =
connect(this.connectionSettings, builder.name(), disconnectHandler, addrs);
this.nativeConnection = wrapper.connection();
return wrapper;
},
this.management,
this.affinity,
this.environment.affinityCache(),
this.affinityStrategy,
ConnectionUtils.NO_RETRY_STRATEGY,
this.name());
this.sync(ncw);
LOGGER.debug("Opened connection '{}' on node '{}'.", this.name(), this.connectionNodename());
this.state(OPEN);
this.environment.metricsCollector().openConnection();
}
@Override
public Management management() {
checkOpen();
return this.managementNoCheck();
}
Management managementNoCheck() {
this.management.init();
return this.management;
}
AmqpManagement createManagement() {
return new AmqpManagement(
new AmqpManagementParameters(this).topologyListener(this.topologyListener));
}
@Override
public PublisherBuilder publisherBuilder() {
checkOpen();
return new AmqpPublisherBuilder(this);
}
@Override
public ConsumerBuilder consumerBuilder() {
checkOpen();
return new AmqpConsumerBuilder(this);
}
@Override
public RpcClientBuilder rpcClientBuilder() {
return new RpcSupport.AmqpRpcClientBuilder(this);
}
@Override
public RpcServerBuilder rpcServerBuilder() {
return new RpcSupport.AmqpRpcServerBuilder(this);
}
@Override
public void close() {
this.close(null);
}
// internal API
private NativeConnectionWrapper connect(
DefaultConnectionSettings connectionSettings,
String name,
BiConsumer disconnectHandler,
List addresses) {
ConnectionOptions connectionOptions = new ConnectionOptions();
if (connectionSettings.credentialsProvider() instanceof UsernamePasswordCredentialsProvider) {
UsernamePasswordCredentialsProvider credentialsProvider =
(UsernamePasswordCredentialsProvider) connectionSettings.credentialsProvider();
connectionOptions.user(credentialsProvider.getUsername());
connectionOptions.password(credentialsProvider.getPassword());
}
connectionOptions.virtualHost("vhost:" + connectionSettings.virtualHost());
connectionOptions.saslOptions().addAllowedMechanism(connectionSettings.saslMechanism());
connectionOptions.idleTimeout(
connectionSettings.idleTimeout().toMillis(), TimeUnit.MILLISECONDS);
connectionOptions.disconnectedHandler(disconnectHandler);
if (name == null) {
connectionOptions.properties(ClientProperties.DEFAULT_CLIENT_PROPERTIES);
} else {
Map props = new LinkedHashMap<>(ClientProperties.DEFAULT_CLIENT_PROPERTIES);
props.put("connection_name", name);
connectionOptions.properties(Map.copyOf(props));
}
if (connectionSettings.tlsEnabled()) {
DefaultConnectionSettings.DefaultTlsSettings tlsSettings =
connectionSettings.tlsSettings();
connectionOptions.sslEnabled(true);
SslOptions sslOptions = connectionOptions.sslOptions();
sslOptions.sslContextOverride(tlsSettings.sslContext());
sslOptions.verifyHost(tlsSettings.isHostnameVerification());
}
Address address = connectionSettings.selectAddress(addresses);
StopWatch stopWatch = new StopWatch();
try {
LOGGER.trace("Connecting '{}' to {}...", this.name(), address);
org.apache.qpid.protonj2.client.Connection connection =
this.environment.client().connect(address.host(), address.port(), connectionOptions);
LOGGER.debug("Created native connection instance for '{}'", this.name());
ExceptionUtils.wrapGet(connection.openFuture());
LOGGER.debug("Connection attempt '{}' succeeded", this.name());
checkBrokerVersion(connection);
return new NativeConnectionWrapper(connection, extractNode(connection), address);
} catch (ClientException e) {
throw ExceptionUtils.convert(e);
} finally {
LOGGER.debug("Connection attempt for '{}' took {}", this.name(), stopWatch.stop());
}
}
private void sync(NativeConnectionWrapper wrapper) {
this.connectionAddress = wrapper.address();
this.connectionNodename = wrapper.nodename();
this.nativeConnection = wrapper.connection();
}
private static void checkBrokerVersion(org.apache.qpid.protonj2.client.Connection connection)
throws ClientException {
String version = (String) connection.properties().get("version");
if (version == null) {
throw new AmqpException("No broker version set in connection properties");
}
if (!Utils.is4_0_OrMore(version)) {
throw new AmqpException("The AMQP client library requires RabbitMQ 4.0 or more");
}
}
private static String extractNode(org.apache.qpid.protonj2.client.Connection connection)
throws ClientException {
String node = (String) connection.properties().get("node");
if (node == null) {
throw new AmqpException("The broker node name is not available");
}
return node;
}
TopologyListener createTopologyListener(AmqpConnectionBuilder builder) {
TopologyListener topologyListener;
if (builder.recoveryConfiguration().topology()) {
RecordingTopologyListener rtl =
new RecordingTopologyListener(
"topology-listener-connection-" + this.name(), this.environment.recoveryEventLoop());
this.entityRecovery = new EntityRecovery(this, rtl);
topologyListener = rtl;
} else {
topologyListener = TopologyListener.NO_OP;
}
return builder.topologyListener() == null
? topologyListener
: TopologyListener.compose(List.of(builder.topologyListener(), topologyListener));
}
private BiConsumer
recoveryDisconnectHandler(
AmqpConnectionBuilder.AmqpRecoveryConfiguration recoveryConfiguration, String name) {
AtomicReference>
resultReference = new AtomicReference<>();
BiConsumer result =
(conn, event) -> {
ClientIOException ioex = event.failureCause();
LOGGER.debug(
"Disconnect handler of '{}', error is the following: {}",
this.name(),
ioex.getMessage());
if (this.state() == OPENING) {
LOGGER.debug("Connection is still opening, disconnect handler skipped");
// the broker is not available when opening the connection
// nothing to do in this listener
return;
}
if (this.recoveringConnection.get()) {
LOGGER.debug(
"Filtering recovery task scheduling, connection recovery of '{}' already in progress",
this.name());
return;
}
AmqpException exception = ExceptionUtils.convert(event.failureCause());
LOGGER.debug("Converted native exception to {}", exception.getClass().getSimpleName());
if (RECOVERY_PREDICATE.test(exception) && this.state() != OPENING) {
LOGGER.debug(
"Queueing recovery task for '{}', error is {}",
this.name(),
exception.getMessage());
this.environment
.executorService()
.submit(
() -> {
if (!this.recoveringConnection.get()) {
recoverAfterConnectionFailure(
recoveryConfiguration, name, exception, resultReference);
}
});
} else {
LOGGER.debug(
"Not recovering connection '{}' for error {}",
this.name(),
event.failureCause().getMessage());
}
};
resultReference.set(result);
return result;
}
private void recoverAfterConnectionFailure(
AmqpConnectionBuilder.AmqpRecoveryConfiguration recoveryConfiguration,
String connectionName,
Exception failureCause,
AtomicReference>
disconnectedHandlerReference) {
LOGGER.info(
"Connection '{}' to '{}' has been disconnected, trying to recover.",
this.name(),
this.currentConnectionLabel());
LOGGER.debug("Notifying listeners of connection '{}'.", this.name());
this.state(RECOVERING, failureCause);
this.changeStateOfPublishers(RECOVERING, failureCause);
this.changeStateOfConsumers(RECOVERING, failureCause);
this.nativeConnection = null;
this.nativeSession = null;
this.connectionAddress = null;
LOGGER.debug("Releasing management resource of connection '{}'.", this.name());
this.releaseManagementResources();
CompletableFuture ncwFuture;
if (this.recoveringConnection.compareAndSet(false, true)) {
this.recoveringConnection.set(true);
LOGGER.debug("Connection attempt for '{}'.", this.name());
ncwFuture =
recoverNativeConnection(
recoveryConfiguration, connectionName, disconnectedHandlerReference);
} else {
LOGGER.debug("Connection '{}' already recovering, returning.", this.name());
return;
}
ncwFuture
.thenAccept(
ncw -> {
this.sync(ncw);
LOGGER.debug("Reconnected '{}' to {}", this.name(), this.currentConnectionLabel());
this.recoveringConnection.set(false);
try {
if (recoveryConfiguration.topology()) {
this.management.init();
LOGGER.debug("Recovering topology of connection '{}'...", this.name());
this.recoverTopology();
this.recoverConsumers();
this.recoverPublishers();
LOGGER.debug("Recovered topology of connection '{}'.", this.name());
}
LOGGER.info(
"Recovered connection '{}' to {}", this.name(), this.currentConnectionLabel());
this.state(OPEN);
} catch (Exception ex) {
// likely InterruptedException or IO exception
LOGGER.info(
"Error while trying to recover topology for connection '{}': {}",
this.name(),
ex.getMessage());
if (RECOVERY_PREDICATE.test(ex)) {
LOGGER.debug(
"Error during topology recoverable, queueing recovery task for '{}', error is {}",
this.name(),
ex.getMessage());
this.environment
.executorService()
.submit(
() -> {
if (!this.recoveringConnection.get()) {
recoverAfterConnectionFailure(
recoveryConfiguration, name, ex, disconnectedHandlerReference);
}
});
}
}
})
.exceptionally(
t -> {
this.recoveringConnection.set(false);
if (t instanceof InterruptedException) {
Thread.currentThread().interrupt();
}
this.close(t);
return null;
});
}
private CompletableFuture recoverNativeConnection(
AmqpConnectionBuilder.AmqpRecoveryConfiguration recoveryConfiguration,
String connectionName,
AtomicReference>
disconnectedHandlerReference) {
return AsyncRetry.asyncRetry(
() ->
ConnectionUtils.enforceAffinity(
addrs -> {
NativeConnectionWrapper wrapper =
connect(
this.connectionSettings,
connectionName,
disconnectedHandlerReference.get(),
addrs);
this.nativeConnection = wrapper.connection();
return wrapper;
},
this.management,
this.affinity,
this.environment.affinityCache(),
this.affinityStrategy,
new ConnectionUtils.RetryStrategy() {
@Override
public T maybeRetry(Supplier task) {
return RetryUtils.callAndMaybeRetry(
task::get,
e -> true,
Duration.ofMillis(10),
5,
"Connection affinity operation");
}
},
connectionName))
.description("Trying to create native connection for '%s'.", connectionName)
.delayPolicy(recoveryConfiguration.backOffDelayPolicy())
.retry(RECOVERY_PREDICATE)
.scheduler(this.scheduledExecutorService())
.build();
}
private void recoverTopology() throws InterruptedException {
if (this.entityRecovery != null) {
Utils.throwIfInterrupted();
this.entityRecovery.recover();
}
}
private void recoverConsumers() throws InterruptedException {
if (this.consumers.isEmpty()) {
LOGGER.debug("No consumers to recover");
} else {
LOGGER.debug("{} consumer(s) to recover", this.consumers.size());
List failedConsumers = new ArrayList<>();
for (AmqpConsumer consumer : this.consumers) {
Utils.throwIfInterrupted();
try {
LOGGER.debug("Recovering consumer {} (queue '{}')", consumer.id(), consumer.queue());
consumer.recoverAfterConnectionFailure();
consumer.state(OPEN);
LOGGER.debug("Recovered consumer {} (queue '{}')", consumer.id(), consumer.queue());
} catch (Exception ex) {
LOGGER.warn(
"Error while trying to recover consumer {} (queue '{}')",
consumer.id(),
consumer.queue(),
ex);
failedConsumers.add(consumer);
}
}
failedConsumers.forEach(AmqpConsumer::close);
}
}
private void recoverPublishers() throws InterruptedException {
if (this.publishers.isEmpty()) {
LOGGER.debug("No publishers to recover");
} else {
LOGGER.debug("{} publisher(s) to recover", this.publishers.size());
List failedPublishers = new ArrayList<>();
for (AmqpPublisher publisher : this.publishers) {
Utils.throwIfInterrupted();
try {
LOGGER.debug(
"Recovering publisher {} (address '{}')", publisher.id(), publisher.address());
publisher.recoverAfterConnectionFailure();
publisher.state(OPEN);
LOGGER.debug(
"Recovered publisher {} (address '{}')", publisher.id(), publisher.address());
} catch (Exception ex) {
LOGGER.warn(
"Error while trying to recover publisher {} (address '{}')",
publisher.id(),
publisher.address(),
ex);
failedPublishers.add(publisher);
}
}
failedPublishers.forEach(AmqpPublisher::close);
}
}
private void closeManagement() {
this.management.close();
}
private void releaseManagementResources() {
if (this.management != null) {
this.management.releaseResources();
}
}
Session nativeSession() {
return nativeSession(true);
}
Session nativeSession(boolean check) {
if (check) {
checkOpen();
}
Session result = this.nativeSession;
if (result == null) {
this.instanceLock.lock();
try {
result = this.nativeSession;
if (result == null) {
if (check) {
checkOpen();
}
this.nativeSession = result = this.openSession(this.nativeConnection);
}
} finally {
this.instanceLock.unlock();
}
}
return result;
}
private Session openSession(org.apache.qpid.protonj2.client.Connection connection) {
try {
return connection.openSession();
} catch (ClientException e) {
throw ExceptionUtils.convert(e, "Error while opening session");
}
}
org.apache.qpid.protonj2.client.Connection nativeConnection() {
return this.nativeConnection;
}
AmqpEnvironment environment() {
return this.environment;
}
ScheduledExecutorService scheduledExecutorService() {
return this.environment.scheduledExecutorService();
}
Clock clock() {
return this.environment.clock();
}
MetricsCollector metricsCollector() {
return this.environment.metricsCollector();
}
ObservationCollector observationCollector() {
return this.environment.observationCollector();
}
SessionHandler createSessionHandler() {
return this.sessionHandlerSupplier.get();
}
Publisher createPublisher(AmqpPublisherBuilder builder) {
// TODO copy the builder properties to create the publisher
AmqpPublisher publisher = new AmqpPublisher(builder);
this.publishers.add(publisher);
return publisher;
}
void removePublisher(AmqpPublisher publisher) {
this.publishers.remove(publisher);
}
Consumer createConsumer(AmqpConsumerBuilder builder) {
// TODO copy the builder properties to create the consumer
AmqpConsumer consumer = new AmqpConsumer(builder);
this.consumers.add(consumer);
this.topologyListener.consumerCreated(consumer.id(), builder.queue());
return consumer;
}
void removeConsumer(AmqpConsumer consumer) {
this.consumers.remove(consumer);
this.topologyListener.consumerDeleted(consumer.id(), consumer.queue());
}
RpcClient createRpcClient(RpcSupport.AmqpRpcClientBuilder builder) {
RpcClient rpcClient = new AmqpRpcClient(builder);
this.rpcClients.add(rpcClient);
return rpcClient;
}
void removeRpcClient(RpcClient rpcClient) {
this.rpcClients.remove(rpcClient);
}
RpcServer createRpcServer(RpcSupport.AmqpRpcServerBuilder builder) {
RpcServer rpcServer = new AmqpRpcServer(builder);
this.rpcServers.add(rpcServer);
return rpcServer;
}
void removeRpcServer(RpcServer rpcServer) {
this.rpcServers.remove(rpcServer);
}
private void changeStateOfPublishers(State newState, Throwable failure) {
this.changeStateOfResources(this.publishers, newState, failure);
}
private void changeStateOfConsumers(State newState, Throwable failure) {
this.changeStateOfResources(this.consumers, newState, failure);
}
private void changeStateOfResources(
List resources, State newState, Throwable failure) {
resources.forEach(r -> r.state(newState, failure));
}
private String currentConnectionLabel() {
if (this.connectionAddress == null) {
return "";
} else {
return this.connectionAddress.host() + ":" + this.connectionAddress.port();
}
}
Address connectionAddress() {
return this.connectionAddress;
}
String connectionNodename() {
return this.connectionNodename;
}
String name() {
return this.name == null ? "" : this.name;
}
ConnectionUtils.AffinityContext affinity() {
return this.affinity;
}
long id() {
return this.id;
}
private void close(Throwable cause) {
if (this.closed.compareAndSet(false, true)) {
this.state(CLOSING, cause);
this.environment.removeConnection(this);
if (this.topologyListener instanceof AutoCloseable) {
try {
((AutoCloseable) this.topologyListener).close();
} catch (Exception e) {
LOGGER.info("Error while closing topology listener", e);
}
}
this.closeManagement();
for (RpcClient rpcClient : this.rpcClients) {
rpcClient.close();
}
for (RpcServer rpcServer : this.rpcServers) {
rpcServer.close();
}
for (AmqpPublisher publisher : this.publishers) {
publisher.close();
}
for (AmqpConsumer consumer : this.consumers) {
consumer.close();
}
try {
org.apache.qpid.protonj2.client.Connection nc = this.nativeConnection;
if (nc != null) {
nc.close();
}
} catch (Exception e) {
LOGGER.warn("Error while closing native connection", e);
}
this.state(CLOSED, cause);
this.environment.metricsCollector().closeConnection();
}
}
@Override
public String toString() {
return this.environment.toString() + "-" + this.id;
}
static class NativeConnectionWrapper {
private final org.apache.qpid.protonj2.client.Connection connection;
private final String nodename;
private final Address address;
NativeConnectionWrapper(
org.apache.qpid.protonj2.client.Connection connection, String nodename, Address address) {
this.connection = connection;
this.nodename = nodename;
this.address = address;
}
String nodename() {
return this.nodename;
}
Address address() {
return this.address;
}
org.apache.qpid.protonj2.client.Connection connection() {
return this.connection;
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
AmqpConnection that = (AmqpConnection) o;
return id == that.id;
}
@Override
public int hashCode() {
return Objects.hashCode(id);
}
}