| /* |
| * 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 io.netty.channel.ChannelHandlerContext; |
| import java.util.List; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicLongFieldUpdater; |
| import java.util.concurrent.atomic.AtomicReference; |
| import java.util.regex.Pattern; |
| import org.apache.pulsar.client.api.PulsarClientException; |
| import org.apache.pulsar.common.api.proto.BaseCommand; |
| import org.apache.pulsar.common.api.proto.CommandWatchTopicUpdate; |
| import org.apache.pulsar.common.naming.NamespaceName; |
| import org.apache.pulsar.common.protocol.Commands; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class TopicListWatcher extends HandlerState implements ConnectionHandler.Connection { |
| |
| private static final Logger log = LoggerFactory.getLogger(TopicListWatcher.class); |
| |
| private static final AtomicLongFieldUpdater<TopicListWatcher> CREATE_WATCHER_DEADLINE_UPDATER = |
| AtomicLongFieldUpdater |
| .newUpdater(TopicListWatcher.class, "createWatcherDeadline"); |
| |
| private final PatternMultiTopicsConsumerImpl.TopicsChangedListener topicsChangeListener; |
| private final String name; |
| private final ConnectionHandler connectionHandler; |
| private final Pattern topicsPattern; |
| private final long watcherId; |
| private volatile long createWatcherDeadline = 0; |
| private final NamespaceName namespace; |
| // TODO maintain the value based on updates from broker and warn the user if inconsistent with hash from polling |
| private String topicsHash; |
| private final CompletableFuture<TopicListWatcher> watcherFuture; |
| |
| private final List<Throwable> previousExceptions = new CopyOnWriteArrayList<>(); |
| private final AtomicReference<ClientCnx> clientCnxUsedForWatcherRegistration = new AtomicReference<>(); |
| |
| |
| public TopicListWatcher(PatternMultiTopicsConsumerImpl.TopicsChangedListener topicsChangeListener, |
| PulsarClientImpl client, Pattern topicsPattern, long watcherId, |
| NamespaceName namespace, String topicsHash, |
| CompletableFuture<TopicListWatcher> watcherFuture) { |
| super(client, topicsPattern.pattern()); |
| this.topicsChangeListener = topicsChangeListener; |
| this.name = "Watcher(" + topicsPattern + ")"; |
| this.connectionHandler = new ConnectionHandler(this, |
| new BackoffBuilder() |
| .setInitialTime(client.getConfiguration().getInitialBackoffIntervalNanos(), |
| TimeUnit.NANOSECONDS) |
| .setMax(client.getConfiguration().getMaxBackoffIntervalNanos(), TimeUnit.NANOSECONDS) |
| .setMandatoryStop(0, TimeUnit.MILLISECONDS) |
| .create(), |
| this); |
| this.topicsPattern = topicsPattern; |
| this.watcherId = watcherId; |
| this.namespace = namespace; |
| this.topicsHash = topicsHash; |
| this.watcherFuture = watcherFuture; |
| |
| connectionHandler.grabCnx(); |
| } |
| |
| @Override |
| public void connectionFailed(PulsarClientException exception) { |
| boolean nonRetriableError = !PulsarClientException.isRetriableError(exception); |
| if (nonRetriableError) { |
| exception.setPreviousExceptions(previousExceptions); |
| if (watcherFuture.completeExceptionally(exception)) { |
| setState(State.Failed); |
| log.info("[{}] Watcher creation failed for {} with non-retriable error {}", |
| topic, name, exception.getMessage()); |
| deregisterFromClientCnx(); |
| } |
| } else { |
| previousExceptions.add(exception); |
| } |
| } |
| |
| @Override |
| public CompletableFuture<Void> connectionOpened(ClientCnx cnx) { |
| previousExceptions.clear(); |
| |
| State state = getState(); |
| if (state == State.Closing || state == State.Closed) { |
| setState(State.Closed); |
| deregisterFromClientCnx(); |
| return CompletableFuture.completedFuture(null); |
| } |
| |
| log.info("[{}][{}] Creating topic list watcher on cnx {}, watcherId {}", |
| topic, getHandlerName(), cnx.ctx().channel(), watcherId); |
| |
| long requestId = client.newRequestId(); |
| |
| CREATE_WATCHER_DEADLINE_UPDATER |
| .compareAndSet(this, 0L, System.currentTimeMillis() |
| + client.getConfiguration().getOperationTimeoutMs()); |
| |
| final CompletableFuture<Void> future = new CompletableFuture<>(); |
| // synchronized this, because redeliverUnAckMessage eliminate the epoch inconsistency between them |
| synchronized (this) { |
| setClientCnx(cnx); |
| BaseCommand watchRequest = Commands.newWatchTopicList(requestId, watcherId, namespace.toString(), |
| topicsPattern.pattern(), topicsHash); |
| |
| cnx.newWatchTopicList(watchRequest, requestId) |
| |
| .thenAccept(response -> { |
| synchronized (TopicListWatcher.this) { |
| if (!changeToReadyState()) { |
| // Watcher was closed while reconnecting, close the connection to make sure the broker |
| // drops the watcher on its side |
| setState(State.Closed); |
| deregisterFromClientCnx(); |
| cnx.channel().close(); |
| future.complete(null); |
| return; |
| } |
| } |
| |
| this.connectionHandler.resetBackoff(); |
| |
| watcherFuture.complete(this); |
| future.complete(null); |
| }).exceptionally((e) -> { |
| deregisterFromClientCnx(); |
| if (getState() == State.Closing || getState() == State.Closed) { |
| // Watcher was closed while reconnecting, close the connection to make sure the broker |
| // drops the watcher on its side |
| cnx.channel().close(); |
| future.complete(null); |
| return null; |
| } |
| log.warn("[{}][{}] Failed to create topic list watcher on {}", |
| topic, getHandlerName(), cnx.channel().remoteAddress()); |
| |
| if (e.getCause() instanceof PulsarClientException |
| && PulsarClientException.isRetriableError(e.getCause()) |
| && System.currentTimeMillis() |
| < CREATE_WATCHER_DEADLINE_UPDATER.get(TopicListWatcher.this)) { |
| future.completeExceptionally(e.getCause()); |
| } else if (!watcherFuture.isDone()) { |
| // unable to create new watcher, fail operation |
| setState(State.Failed); |
| watcherFuture.completeExceptionally( |
| PulsarClientException.wrap(e, String.format("Failed to create topic list watcher %s" |
| + "when connecting to the broker", getHandlerName()))); |
| } else { |
| // watcher was subscribed and connected, but we got some error, keep trying |
| future.completeExceptionally(e.getCause()); |
| } |
| if (!future.isDone()) { |
| future.complete(null); |
| } |
| return null; |
| }); |
| } |
| return future; |
| } |
| |
| @Override |
| String getHandlerName() { |
| return name; |
| } |
| |
| public boolean isConnected() { |
| return getClientCnx() != null && (getState() == State.Ready); |
| } |
| |
| public ClientCnx getClientCnx() { |
| return this.connectionHandler.cnx(); |
| } |
| |
| public CompletableFuture<Void> closeAsync() { |
| |
| CompletableFuture<Void> closeFuture = new CompletableFuture<>(); |
| |
| if (getState() == State.Closing || getState() == State.Closed) { |
| closeFuture.complete(null); |
| return closeFuture; |
| } |
| |
| if (!isConnected()) { |
| log.info("[{}] [{}] Closed watcher (not connected)", topic, getHandlerName()); |
| setState(State.Closed); |
| deregisterFromClientCnx(); |
| closeFuture.complete(null); |
| return closeFuture; |
| } |
| |
| setState(State.Closing); |
| |
| |
| long requestId = client.newRequestId(); |
| |
| ClientCnx cnx = cnx(); |
| if (null == cnx) { |
| cleanupAtClose(closeFuture, null); |
| } else { |
| BaseCommand cmd = Commands.newWatchTopicListClose(watcherId, requestId); |
| cnx.newWatchTopicListClose(cmd, requestId).handle((v, exception) -> { |
| final ChannelHandlerContext ctx = cnx.ctx(); |
| boolean ignoreException = ctx == null || !ctx.channel().isActive(); |
| if (ignoreException && exception != null) { |
| log.debug("Exception ignored in closing watcher", exception); |
| } |
| cleanupAtClose(closeFuture, ignoreException ? null : exception); |
| return null; |
| }); |
| } |
| |
| return closeFuture; |
| } |
| |
| // wrapper for connection methods |
| ClientCnx cnx() { |
| return this.connectionHandler.cnx(); |
| } |
| |
| public void connectionClosed(ClientCnx clientCnx) { |
| this.connectionHandler.connectionClosed(clientCnx); |
| } |
| |
| void setClientCnx(ClientCnx clientCnx) { |
| if (clientCnx != null) { |
| this.connectionHandler.setClientCnx(clientCnx); |
| clientCnx.registerTopicListWatcher(watcherId, this); |
| } |
| ClientCnx previousClientCnx = clientCnxUsedForWatcherRegistration.getAndSet(clientCnx); |
| if (previousClientCnx != null && previousClientCnx != clientCnx) { |
| previousClientCnx.removeTopicListWatcher(watcherId); |
| } |
| } |
| |
| void deregisterFromClientCnx() { |
| setClientCnx(null); |
| } |
| |
| private void cleanupAtClose(CompletableFuture<Void> closeFuture, Throwable exception) { |
| log.info("[{}] Closed topic list watcher", getHandlerName()); |
| setState(State.Closed); |
| deregisterFromClientCnx(); |
| if (exception != null) { |
| closeFuture.completeExceptionally(exception); |
| } else { |
| closeFuture.complete(null); |
| } |
| } |
| |
| public void handleCommandWatchTopicUpdate(CommandWatchTopicUpdate update) { |
| List<String> deleted = update.getDeletedTopicsList(); |
| if (!deleted.isEmpty()) { |
| topicsChangeListener.onTopicsRemoved(deleted); |
| } |
| List<String> added = update.getNewTopicsList(); |
| if (!added.isEmpty()) { |
| topicsChangeListener.onTopicsAdded(added); |
| } |
| } |
| } |