| /** |
| * 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.distributedlog.feature; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.Lists; |
| import com.google.common.util.concurrent.ThreadFactoryBuilder; |
| import org.apache.distributedlog.DistributedLogConfiguration; |
| import org.apache.distributedlog.common.config.ConcurrentBaseConfiguration; |
| import org.apache.distributedlog.common.config.ConfigurationListener; |
| import org.apache.distributedlog.common.config.ConfigurationSubscription; |
| import org.apache.distributedlog.common.config.FileConfigurationBuilder; |
| import org.apache.distributedlog.common.config.PropertiesConfigurationBuilder; |
| import org.apache.bookkeeper.feature.Feature; |
| import org.apache.bookkeeper.feature.FeatureProvider; |
| import org.apache.bookkeeper.feature.SettableFeature; |
| import org.apache.bookkeeper.stats.StatsLogger; |
| import org.apache.commons.configuration.ConfigurationException; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Feature Provider based dynamic configuration. |
| */ |
| public class DynamicConfigurationFeatureProvider extends AbstractFeatureProvider |
| implements ConfigurationListener { |
| |
| private final ConcurrentBaseConfiguration featuresConf; |
| private ConfigurationSubscription featuresConfSubscription; |
| private final ConcurrentMap<String, SettableFeature> features; |
| private final ScheduledExecutorService executorService; |
| |
| public DynamicConfigurationFeatureProvider(String rootScope, |
| DistributedLogConfiguration conf, |
| StatsLogger statsLogger) { |
| super(rootScope, conf, statsLogger); |
| this.features = new ConcurrentHashMap<String, SettableFeature>(); |
| this.featuresConf = new ConcurrentBaseConfiguration(); |
| this.executorService = Executors.newSingleThreadScheduledExecutor( |
| new ThreadFactoryBuilder().setNameFormat("DynamicConfigurationFeatureProvider-%d").build()); |
| } |
| |
| ConcurrentBaseConfiguration getFeatureConf() { |
| return featuresConf; |
| } |
| |
| ConfigurationSubscription getFeatureConfSubscription() { |
| return featuresConfSubscription; |
| } |
| |
| @Override |
| public void start() throws IOException { |
| List<FileConfigurationBuilder> fileConfigBuilders = |
| Lists.newArrayListWithExpectedSize(2); |
| String baseConfigPath = conf.getFileFeatureProviderBaseConfigPath(); |
| Preconditions.checkNotNull(baseConfigPath); |
| File baseConfigFile = new File(baseConfigPath); |
| FileConfigurationBuilder baseProperties = |
| new PropertiesConfigurationBuilder(baseConfigFile.toURI().toURL()); |
| fileConfigBuilders.add(baseProperties); |
| String overlayConfigPath = conf.getFileFeatureProviderOverlayConfigPath(); |
| if (null != overlayConfigPath) { |
| File overlayConfigFile = new File(overlayConfigPath); |
| FileConfigurationBuilder overlayProperties = |
| new PropertiesConfigurationBuilder(overlayConfigFile.toURI().toURL()); |
| fileConfigBuilders.add(overlayProperties); |
| } |
| try { |
| this.featuresConfSubscription = new ConfigurationSubscription( |
| this.featuresConf, |
| fileConfigBuilders, |
| executorService, |
| conf.getDynamicConfigReloadIntervalSec(), |
| TimeUnit.SECONDS); |
| } catch (ConfigurationException e) { |
| throw new IOException("Failed to register subscription on features configuration"); |
| } |
| this.featuresConfSubscription.registerListener(this); |
| } |
| |
| @Override |
| public void stop() { |
| this.executorService.shutdown(); |
| } |
| |
| @Override |
| public void onReload(ConcurrentBaseConfiguration conf) { |
| for (Map.Entry<String, SettableFeature> feature : features.entrySet()) { |
| String featureName = feature.getKey(); |
| int availability = conf.getInt(featureName, 0); |
| if (availability != feature.getValue().availability()) { |
| feature.getValue().set(availability); |
| logger.info("Reload feature {}={}", featureName, availability); |
| } |
| } |
| } |
| |
| @Override |
| protected Feature makeFeature(String featureName) { |
| return ConfigurationFeatureProvider.makeFeature( |
| featuresConf, features, featureName); |
| } |
| |
| @Override |
| protected FeatureProvider makeProvider(String fullScopeName) { |
| return new ConfigurationFeatureProvider( |
| fullScopeName, featuresConf, features); |
| } |
| } |