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Implement broker registry for new load manager
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...ker/src/main/java/org/apache/pulsar/broker/loadbalance/extensions/BrokerRegistryImpl.java
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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.broker.loadbalance.extensions; | ||
|
|
||
| import com.google.common.annotations.VisibleForTesting; | ||
| import com.google.common.collect.Lists; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.CompletionException; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.concurrent.ExecutionException; | ||
| import java.util.concurrent.RejectedExecutionException; | ||
| import java.util.concurrent.ScheduledExecutorService; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.TimeoutException; | ||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
| import java.util.function.BiConsumer; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.apache.pulsar.broker.PulsarServerException; | ||
| import org.apache.pulsar.broker.PulsarService; | ||
| import org.apache.pulsar.broker.ServiceConfiguration; | ||
| import org.apache.pulsar.broker.loadbalance.extensions.data.BrokerLookupData; | ||
| import org.apache.pulsar.common.util.FutureUtil; | ||
| import org.apache.pulsar.metadata.api.MetadataStoreException; | ||
| import org.apache.pulsar.metadata.api.Notification; | ||
| import org.apache.pulsar.metadata.api.NotificationType; | ||
| import org.apache.pulsar.metadata.api.coordination.LockManager; | ||
| import org.apache.pulsar.metadata.api.coordination.ResourceLock; | ||
|
|
||
| /** | ||
| * The broker registry impl, base on the LockManager. | ||
| */ | ||
| @Slf4j | ||
| public class BrokerRegistryImpl implements BrokerRegistry { | ||
|
|
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| protected static final String LOOKUP_DATA_PATH = "/loadbalance/brokers"; | ||
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| private final PulsarService pulsar; | ||
|
|
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| private final ServiceConfiguration conf; | ||
|
|
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| private final BrokerLookupData brokerLookupData; | ||
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| private final LockManager<BrokerLookupData> brokerLookupDataLockManager; | ||
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| private final String brokerId; | ||
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| private final ScheduledExecutorService scheduler; | ||
|
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| private final List<BiConsumer<String, NotificationType>> listeners; | ||
|
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| private volatile ResourceLock<BrokerLookupData> brokerLookupDataLock; | ||
|
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| private volatile boolean registered = false; | ||
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| private final AtomicBoolean started = new AtomicBoolean(false); | ||
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| public BrokerRegistryImpl(PulsarService pulsar) { | ||
| this.pulsar = pulsar; | ||
| this.conf = pulsar.getConfiguration(); | ||
| this.brokerLookupDataLockManager = pulsar.getCoordinationService().getLockManager(BrokerLookupData.class); | ||
| this.scheduler = pulsar.getLoadManagerExecutor(); | ||
| this.listeners = new ArrayList<>(); | ||
| this.brokerId = pulsar.getLookupServiceAddress(); | ||
| this.brokerLookupData = new BrokerLookupData( | ||
| pulsar.getSafeWebServiceAddress(), | ||
| pulsar.getWebServiceAddressTls(), | ||
| pulsar.getBrokerServiceUrl(), | ||
| pulsar.getBrokerServiceUrlTls(), | ||
| pulsar.getAdvertisedListeners(), | ||
| pulsar.getProtocolDataToAdvertise(), | ||
| pulsar.getConfiguration().isEnablePersistentTopics(), | ||
| pulsar.getConfiguration().isEnableNonPersistentTopics(), | ||
| pulsar.getBrokerVersion()); | ||
| } | ||
|
|
||
| @Override | ||
| public void start() throws PulsarServerException { | ||
| if (started.get()) { | ||
| return; | ||
| } | ||
| pulsar.getLocalMetadataStore().registerListener(this::handleMetadataStoreNotification); | ||
| try { | ||
| this.register(); | ||
| this.started.set(true); | ||
| } catch (MetadataStoreException e) { | ||
| throw new PulsarServerException(e); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public boolean isStarted() { | ||
| return this.started.get(); | ||
| } | ||
|
|
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| @Override | ||
| public synchronized void register() throws MetadataStoreException { | ||
| if (!registered) { | ||
| try { | ||
| this.brokerLookupDataLock = brokerLookupDataLockManager.acquireLock(keyPath(brokerId), brokerLookupData) | ||
| .get(conf.getMetadataStoreOperationTimeoutSeconds(), TimeUnit.SECONDS); | ||
| registered = true; | ||
| } catch (InterruptedException | ExecutionException | TimeoutException e) { | ||
| throw MetadataStoreException.unwrap(e); | ||
| } | ||
| } | ||
| } | ||
|
|
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| @Override | ||
| public synchronized void unregister() throws MetadataStoreException { | ||
| if (registered) { | ||
| try { | ||
| brokerLookupDataLock.release().get(conf.getMetadataStoreOperationTimeoutSeconds(), TimeUnit.SECONDS); | ||
| registered = false; | ||
| } catch (CompletionException | InterruptedException | ExecutionException | TimeoutException e) { | ||
| throw MetadataStoreException.unwrap(e); | ||
| } | ||
| } | ||
| } | ||
|
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| @Override | ||
| public String getBrokerId() { | ||
| return this.brokerId; | ||
| } | ||
|
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| @Override | ||
| public CompletableFuture<List<String>> getAvailableBrokersAsync() { | ||
| return brokerLookupDataLockManager.listLocks(LOOKUP_DATA_PATH).thenApply(Lists::newArrayList); | ||
| } | ||
|
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| @Override | ||
| public CompletableFuture<Optional<BrokerLookupData>> lookupAsync(String broker) { | ||
| return brokerLookupDataLockManager.readLock(keyPath(broker)); | ||
| } | ||
|
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| public CompletableFuture<Map<String, BrokerLookupData>> getAvailableBrokerLookupDataAsync() { | ||
| return this.getAvailableBrokersAsync().thenCompose(availableBrokers -> { | ||
| Map<String, BrokerLookupData> map = new ConcurrentHashMap<>(); | ||
| List<CompletableFuture<Void>> futures = new ArrayList<>(); | ||
| for (String brokerId : availableBrokers) { | ||
| futures.add(this.lookupAsync(brokerId).thenAccept(lookupDataOpt -> | ||
| lookupDataOpt.ifPresent(lookupData -> map.put(brokerId, lookupData)))); | ||
| } | ||
| return FutureUtil.waitForAll(futures).thenCompose(__ -> CompletableFuture.completedFuture(map)); | ||
| }); | ||
| } | ||
|
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| public void listen(BiConsumer<String, NotificationType> listener) { | ||
| this.listeners.add(listener); | ||
| } | ||
|
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| @Override | ||
| public void close() throws PulsarServerException { | ||
| if (!started.get()) { | ||
| return; | ||
| } | ||
| try { | ||
| this.unregister(); | ||
| brokerLookupDataLockManager.close(); | ||
| scheduler.shutdown(); | ||
| this.listeners.clear(); | ||
| started.set(false); | ||
| } catch (Exception ex) { | ||
| if (ex.getCause() instanceof MetadataStoreException.NotFoundException) { | ||
| throw new PulsarServerException.NotFoundException(MetadataStoreException.unwrap(ex)); | ||
| } else { | ||
| throw new PulsarServerException(MetadataStoreException.unwrap(ex)); | ||
| } | ||
| } | ||
| } | ||
|
|
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| private void handleMetadataStoreNotification(Notification t) { | ||
| if (!isVerifiedNotification(t)) { | ||
| return; | ||
| } | ||
| try { | ||
| if (log.isDebugEnabled()) { | ||
| log.debug("Handle notification: [{}]", t); | ||
| } | ||
| if (listeners.isEmpty()) { | ||
| return; | ||
| } | ||
| this.scheduler.submit(() -> { | ||
| String brokerId = t.getPath().substring(LOOKUP_DATA_PATH.length() + 1); | ||
| for (BiConsumer<String, NotificationType> listener : listeners) { | ||
| listener.accept(brokerId, t.getType()); | ||
| } | ||
| }); | ||
| } catch (RejectedExecutionException e) { | ||
| // Executor is shutting down | ||
| } | ||
| } | ||
|
|
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| @VisibleForTesting | ||
| protected static boolean isVerifiedNotification(Notification t) { | ||
| return t.getPath().startsWith(LOOKUP_DATA_PATH + "/") && t.getPath().length() > LOOKUP_DATA_PATH.length() + 1; | ||
| } | ||
|
|
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| @VisibleForTesting | ||
| protected static String keyPath(String brokerId) { | ||
| return String.format("%s/%s", LOOKUP_DATA_PATH, brokerId); | ||
| } | ||
| } |
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