| /** |
| * 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.config; |
| |
| import com.google.common.base.Optional; |
| import com.google.common.base.Preconditions; |
| |
| import com.google.common.collect.Lists; |
| import org.apache.distributedlog.DistributedLogConfiguration; |
| |
| import java.io.File; |
| import java.net.MalformedURLException; |
| import java.util.HashMap; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.commons.configuration.ConfigurationException; |
| |
| import org.apache.distributedlog.common.config.ConcurrentBaseConfiguration; |
| import org.apache.distributedlog.common.config.ConcurrentConstConfiguration; |
| import org.apache.distributedlog.common.config.ConfigurationSubscription; |
| import org.apache.distributedlog.common.config.FileConfigurationBuilder; |
| import org.apache.distributedlog.common.config.PropertiesConfigurationBuilder; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Encapsulates creation of DynamicDistributedLogConfiguration instances. Ensures one instance per |
| * factory. |
| * Notes: |
| * Once loaded, stays loaded until shutdown. Caller ensures small finite number of configs are created. |
| */ |
| public class DynamicConfigurationFactory { |
| private static final Logger LOG = LoggerFactory.getLogger(DynamicConfigurationFactory.class); |
| |
| private final Map<String, DynamicDistributedLogConfiguration> dynamicConfigs; |
| private final List<ConfigurationSubscription> subscriptions; |
| private final ScheduledExecutorService executorService; |
| private final int reloadPeriod; |
| private final TimeUnit reloadUnit; |
| |
| public DynamicConfigurationFactory(ScheduledExecutorService executorService, int reloadPeriod, TimeUnit reloadUnit) { |
| this.executorService = executorService; |
| this.reloadPeriod = reloadPeriod; |
| this.reloadUnit = reloadUnit; |
| this.dynamicConfigs = new HashMap<String, DynamicDistributedLogConfiguration>(); |
| this.subscriptions = new LinkedList<ConfigurationSubscription>(); |
| } |
| |
| public synchronized Optional<DynamicDistributedLogConfiguration> getDynamicConfiguration( |
| String configPath, |
| ConcurrentBaseConfiguration defaultConf) throws ConfigurationException { |
| Preconditions.checkNotNull(configPath); |
| try { |
| if (!dynamicConfigs.containsKey(configPath)) { |
| File configFile = new File(configPath); |
| FileConfigurationBuilder properties = |
| new PropertiesConfigurationBuilder(configFile.toURI().toURL()); |
| DynamicDistributedLogConfiguration dynConf = |
| new DynamicDistributedLogConfiguration(defaultConf); |
| List<FileConfigurationBuilder> fileConfigBuilders = Lists.newArrayList(properties); |
| ConfigurationSubscription subscription = new ConfigurationSubscription( |
| dynConf, fileConfigBuilders, executorService, reloadPeriod, reloadUnit); |
| subscriptions.add(subscription); |
| dynamicConfigs.put(configPath, dynConf); |
| LOG.info("Loaded dynamic configuration at {}", configPath); |
| } |
| return Optional.of(dynamicConfigs.get(configPath)); |
| } catch (MalformedURLException ex) { |
| throw new ConfigurationException(ex); |
| } |
| } |
| |
| public synchronized Optional<DynamicDistributedLogConfiguration> getDynamicConfiguration(String configPath) throws ConfigurationException { |
| return getDynamicConfiguration(configPath, new ConcurrentConstConfiguration(new DistributedLogConfiguration())); |
| } |
| } |