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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.pulsar.client.impl;
import java.net.InetSocketAddress;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import lombok.Getter;
import lombok.Setter;
import org.apache.pulsar.client.api.PulsarClientException;
import org.apache.pulsar.client.impl.HandlerState.State;
import org.apache.pulsar.common.protocol.Commands;
import org.apache.pulsar.common.util.Backoff;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ConnectionHandler {
private static final AtomicReferenceFieldUpdater CLIENT_CNX_UPDATER =
AtomicReferenceFieldUpdater.newUpdater(ConnectionHandler.class, ClientCnx.class, "clientCnx");
@SuppressWarnings("unused")
private volatile ClientCnx clientCnx = null;
@Getter
@Setter
// Since the `clientCnx` variable will be set to null at some times, it is necessary to save this value here.
private volatile int maxMessageSize = Commands.DEFAULT_MAX_MESSAGE_SIZE;
protected final HandlerState state;
protected final Backoff backoff;
private static final AtomicLongFieldUpdater EPOCH_UPDATER = AtomicLongFieldUpdater
.newUpdater(ConnectionHandler.class, "epoch");
// Start with -1L because it gets incremented before sending on the first connection
private volatile long epoch = -1L;
protected volatile long lastConnectionClosedTimestamp = 0L;
private final AtomicBoolean duringConnect = new AtomicBoolean(false);
protected final int randomKeyForSelectConnection;
interface Connection {
/**
* @apiNote If the returned future is completed exceptionally, reconnectLater will be called.
*/
CompletableFuture connectionOpened(ClientCnx cnx);
default void connectionFailed(PulsarClientException e) {
}
}
protected Connection connection;
protected ConnectionHandler(HandlerState state, Backoff backoff, Connection connection) {
this.state = state;
this.randomKeyForSelectConnection = state.client.getCnxPool().genRandomKeyToSelectCon();
this.connection = connection;
this.backoff = backoff;
CLIENT_CNX_UPDATER.set(this, null);
}
protected void grabCnx() {
if (!duringConnect.compareAndSet(false, true)) {
log.info("[{}] [{}] Skip grabbing the connection since there is a pending connection",
state.topic, state.getHandlerName());
return;
}
if (CLIENT_CNX_UPDATER.get(this) != null) {
log.warn("[{}] [{}] Client cnx already set, ignoring reconnection request",
state.topic, state.getHandlerName());
return;
}
if (!isValidStateForReconnection()) {
// Ignore connection closed when we are shutting down
log.info("[{}] [{}] Ignoring reconnection request (state: {})",
state.topic, state.getHandlerName(), state.getState());
return;
}
try {
CompletableFuture cnxFuture;
if (state.redirectedClusterURI != null) {
if (state.topic == null) {
InetSocketAddress address = InetSocketAddress.createUnresolved(state.redirectedClusterURI.getHost(),
state.redirectedClusterURI.getPort());
cnxFuture = state.client.getConnection(address, address, randomKeyForSelectConnection);
} else {
// once, client receives redirection url, client has to perform lookup on migrated
// cluster to find the broker that owns the topic and then create connection.
// below method, performs the lookup for a given topic and then creates connection
cnxFuture = state.client.getConnection(state.topic, (state.redirectedClusterURI.toString()));
}
} else if (state.topic == null) {
cnxFuture = state.client.getConnectionToServiceUrl();
} else {
cnxFuture = state.client.getConnection(state.topic, randomKeyForSelectConnection);
}
cnxFuture.thenCompose(cnx -> connection.connectionOpened(cnx))
.thenAccept(__ -> duringConnect.set(false))
.exceptionally(this::handleConnectionError);
} catch (Throwable t) {
log.warn("[{}] [{}] Exception thrown while getting connection: ", state.topic, state.getHandlerName(), t);
reconnectLater(t);
}
}
private Void handleConnectionError(Throwable exception) {
try {
log.warn("[{}] [{}] Error connecting to broker: {}",
state.topic, state.getHandlerName(), exception.getMessage());
if (exception instanceof PulsarClientException) {
connection.connectionFailed((PulsarClientException) exception);
} else if (exception.getCause() instanceof PulsarClientException) {
connection.connectionFailed((PulsarClientException) exception.getCause());
} else {
connection.connectionFailed(new PulsarClientException(exception));
}
} catch (Throwable throwable) {
log.error("[{}] [{}] Unexpected exception after the connection",
state.topic, state.getHandlerName(), throwable);
}
reconnectLater(exception);
return null;
}
void reconnectLater(Throwable exception) {
CLIENT_CNX_UPDATER.set(this, null);
duringConnect.set(false);
if (!isValidStateForReconnection()) {
log.info("[{}] [{}] Ignoring reconnection request (state: {})",
state.topic, state.getHandlerName(), state.getState());
return;
}
long delayMs = backoff.next();
log.warn("[{}] [{}] Could not get connection to broker: {} -- Will try again in {} s",
state.topic, state.getHandlerName(),
exception.getMessage(), delayMs / 1000.0);
if (state.changeToConnecting()) {
state.client.timer().newTimeout(timeout -> {
log.info("[{}] [{}] Reconnecting after connection was closed", state.topic, state.getHandlerName());
grabCnx();
}, delayMs, TimeUnit.MILLISECONDS);
} else {
log.info("[{}] [{}] Ignoring reconnection request (state: {})",
state.topic, state.getHandlerName(), state.getState());
}
}
public void connectionClosed(ClientCnx cnx) {
lastConnectionClosedTimestamp = System.currentTimeMillis();
duringConnect.set(false);
state.client.getCnxPool().releaseConnection(cnx);
if (CLIENT_CNX_UPDATER.compareAndSet(this, cnx, null)) {
if (!isValidStateForReconnection()) {
log.info("[{}] [{}] Ignoring reconnection request (state: {})",
state.topic, state.getHandlerName(), state.getState());
return;
}
long delayMs = backoff.next();
state.setState(State.Connecting);
log.info("[{}] [{}] Closed connection {} -- Will try again in {} s",
state.topic, state.getHandlerName(), cnx.channel(),
delayMs / 1000.0);
state.client.timer().newTimeout(timeout -> {
log.info("[{}] [{}] Reconnecting after timeout", state.topic, state.getHandlerName());
grabCnx();
}, delayMs, TimeUnit.MILLISECONDS);
}
}
protected void resetBackoff() {
backoff.reset();
}
public ClientCnx cnx() {
return CLIENT_CNX_UPDATER.get(this);
}
protected void setClientCnx(ClientCnx clientCnx) {
CLIENT_CNX_UPDATER.set(this, clientCnx);
}
/**
* Update the {@link ClientCnx} for the class, then increment and get the epoch value. Note that the epoch value is
* currently only used by the {@link ProducerImpl}.
* @param clientCnx - the new {@link ClientCnx}
* @return the epoch value to use for this pair of {@link ClientCnx} and {@link ProducerImpl}
*/
protected long switchClientCnx(ClientCnx clientCnx) {
setClientCnx(clientCnx);
return EPOCH_UPDATER.incrementAndGet(this);
}
private boolean isValidStateForReconnection() {
State state = this.state.getState();
switch (state) {
case Uninitialized:
case Connecting:
case RegisteringSchema:
case Ready:
// Ok
return true;
case Closing:
case Closed:
case Failed:
case ProducerFenced:
case Terminated:
return false;
}
return false;
}
public long getEpoch() {
return epoch;
}
private static final Logger log = LoggerFactory.getLogger(ConnectionHandler.class);
}
