| /** |
| * 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 com.twitter.distributedlog.service.config; |
| |
| import com.google.common.base.Optional; |
| import com.twitter.distributedlog.config.DynamicConfigurationFactory; |
| import com.twitter.distributedlog.config.DynamicDistributedLogConfiguration; |
| import com.twitter.distributedlog.service.streamset.StreamPartitionConverter; |
| import org.apache.commons.configuration.ConfigurationException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Provide per stream configuration to DistributedLog service layer. |
| */ |
| public class ServiceStreamConfigProvider implements StreamConfigProvider { |
| static final Logger LOG = LoggerFactory.getLogger(ServiceStreamConfigProvider.class); |
| |
| private final File configBaseDir; |
| private final File defaultConfigFile; |
| private final StreamPartitionConverter partitionConverter; |
| private final DynamicConfigurationFactory configFactory; |
| private final DynamicDistributedLogConfiguration defaultDynConf; |
| private final static String CONFIG_EXTENSION = "conf"; |
| |
| public ServiceStreamConfigProvider(String configPath, |
| String defaultConfigPath, |
| StreamPartitionConverter partitionConverter, |
| ScheduledExecutorService executorService, |
| int reloadPeriod, |
| TimeUnit reloadUnit) |
| throws ConfigurationException { |
| this.configBaseDir = new File(configPath); |
| if (!configBaseDir.exists()) { |
| throw new ConfigurationException("Stream configuration base directory " + configPath + " does not exist"); |
| } |
| this.defaultConfigFile = new File(configPath); |
| if (!defaultConfigFile.exists()) { |
| throw new ConfigurationException("Stream configuration default config " + defaultConfigPath + " does not exist"); |
| } |
| |
| // Construct reloading default configuration |
| this.partitionConverter = partitionConverter; |
| this.configFactory = new DynamicConfigurationFactory(executorService, reloadPeriod, reloadUnit); |
| // We know it exists from the check above. |
| this.defaultDynConf = configFactory.getDynamicConfiguration(defaultConfigPath).get(); |
| } |
| |
| @Override |
| public Optional<DynamicDistributedLogConfiguration> getDynamicStreamConfig(String streamName) { |
| String configName = partitionConverter.convert(streamName).getStream(); |
| String configPath = getConfigPath(configName); |
| Optional<DynamicDistributedLogConfiguration> dynConf = Optional.<DynamicDistributedLogConfiguration>absent(); |
| try { |
| dynConf = configFactory.getDynamicConfiguration(configPath, defaultDynConf); |
| } catch (ConfigurationException ex) { |
| LOG.warn("Configuration exception for stream {} ({}) at {}", |
| new Object[] {streamName, configName, configPath, ex}); |
| } |
| return dynConf; |
| } |
| |
| private String getConfigPath(String configName) { |
| return new File(configBaseDir, String.format("%s.%s", configName, CONFIG_EXTENSION)).getPath(); |
| } |
| } |