kafka FileConfigProvider 源码
kafka FileConfigProvider 代码
文件路径:/clients/src/main/java/org/apache/kafka/common/config/provider/FileConfigProvider.java
/*
* 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.kafka.common.config.provider;
import org.apache.kafka.common.config.ConfigData;
import org.apache.kafka.common.config.ConfigException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.io.Reader;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
/**
* An implementation of {@link ConfigProvider} that represents a Properties file.
* All property keys and values are stored as cleartext.
*/
public class FileConfigProvider implements ConfigProvider {
private static final Logger log = LoggerFactory.getLogger(FileConfigProvider.class);
public void configure(Map<String, ?> configs) {
}
/**
* Retrieves the data at the given Properties file.
*
* @param path the file where the data resides
* @return the configuration data
*/
public ConfigData get(String path) {
Map<String, String> data = new HashMap<>();
if (path == null || path.isEmpty()) {
return new ConfigData(data);
}
try (Reader reader = reader(path)) {
Properties properties = new Properties();
properties.load(reader);
Enumeration<Object> keys = properties.keys();
while (keys.hasMoreElements()) {
String key = keys.nextElement().toString();
String value = properties.getProperty(key);
if (value != null) {
data.put(key, value);
}
}
return new ConfigData(data);
} catch (IOException e) {
log.error("Could not read properties from file {}", path, e);
throw new ConfigException("Could not read properties from file " + path);
}
}
/**
* Retrieves the data with the given keys at the given Properties file.
*
* @param path the file where the data resides
* @param keys the keys whose values will be retrieved
* @return the configuration data
*/
public ConfigData get(String path, Set<String> keys) {
Map<String, String> data = new HashMap<>();
if (path == null || path.isEmpty()) {
return new ConfigData(data);
}
try (Reader reader = reader(path)) {
Properties properties = new Properties();
properties.load(reader);
for (String key : keys) {
String value = properties.getProperty(key);
if (value != null) {
data.put(key, value);
}
}
return new ConfigData(data);
} catch (IOException e) {
log.error("Could not read properties from file {}", path, e);
throw new ConfigException("Could not read properties from file " + path);
}
}
// visible for testing
protected Reader reader(String path) throws IOException {
return Files.newBufferedReader(Paths.get(path));
}
public void close() {
}
}
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