| /* |
| * 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.samza.util; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Optional; |
| import org.apache.samza.SamzaException; |
| import org.apache.samza.config.Config; |
| import org.apache.samza.config.ConfigException; |
| import org.apache.samza.config.ConfigLoader; |
| import org.apache.samza.config.ConfigLoaderFactory; |
| import org.apache.samza.config.ConfigRewriter; |
| import org.apache.samza.config.JobConfig; |
| import org.apache.samza.config.MapConfig; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| public class ConfigUtil { |
| private static final Logger LOG = LoggerFactory.getLogger(ConfigUtil.class); |
| |
| /** |
| * Re-writes configuration using a ConfigRewriter, if one is defined. If |
| * there is no ConfigRewriter defined for the job, then this method is a |
| * no-op. |
| * |
| * @param config The config to re-write |
| * @return rewrited configs |
| */ |
| public static Config rewriteConfig(Config config) { |
| Optional<String> configRewriterNamesOptional = new JobConfig(config).getConfigRewriters(); |
| if (configRewriterNamesOptional.isPresent()) { |
| String[] configRewriterNames = configRewriterNamesOptional.get().split(","); |
| Config rewrittenConfig = config; |
| for (String configRewriterName : configRewriterNames) { |
| rewrittenConfig = applyRewriter(rewrittenConfig, configRewriterName); |
| } |
| return rewrittenConfig; |
| } else { |
| return config; |
| } |
| } |
| |
| /** |
| * Re-writes configuration using a ConfigRewriter, defined with the given rewriterName in config. |
| * @param config the config to re-write |
| * @param rewriterName the name of the rewriter to apply |
| * @return the rewritten config |
| */ |
| public static Config applyRewriter(Config config, String rewriterName) { |
| String rewriterClassName = new JobConfig(config).getConfigRewriterClass(rewriterName) |
| .orElseThrow(() -> new SamzaException( |
| String.format("Unable to find class config for config rewriter %s.", rewriterName))); |
| ConfigRewriter rewriter = ReflectionUtil.getObj(rewriterClassName, ConfigRewriter.class); |
| LOG.info("Re-writing config with {}", rewriter); |
| return rewriter.rewrite(rewriterName, config); |
| } |
| |
| /** |
| * Load full job config with {@link ConfigLoaderFactory} when present. |
| * |
| * @param original config |
| * @return full job config |
| */ |
| public static Config loadConfig(Config original) { |
| JobConfig jobConfig = new JobConfig(original); |
| |
| if (!jobConfig.getConfigLoaderFactory().isPresent()) { |
| throw new ConfigException("Missing key " + JobConfig.CONFIG_LOADER_FACTORY + "."); |
| } |
| |
| ConfigLoaderFactory factory = ReflectionUtil.getObj(jobConfig.getConfigLoaderFactory().get(), ConfigLoaderFactory.class); |
| ConfigLoader loader = factory.getLoader(original.subset(ConfigLoaderFactory.CONFIG_LOADER_PROPERTIES_PREFIX)); |
| // overrides config loaded with original config, which may contain overridden values. |
| return rewriteConfig(override(loader.getConfig(), original)); |
| } |
| |
| /** |
| * Overrides original config with overridden values. |
| * |
| * @param original config to be overridden. |
| * @param overrides overridden values. |
| * @return the overridden config. |
| */ |
| @SafeVarargs |
| private static Config override(Config original, Map<String, String>... overrides) { |
| Map<String, String> map = new HashMap<>(original); |
| |
| for (Map<String, String> override : overrides) { |
| map.putAll(override); |
| } |
| |
| return new MapConfig(map); |
| } |
| } |