| /* |
| * 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.logging.log4j.util; |
| |
| import java.util.Objects; |
| import java.util.Properties; |
| |
| /** |
| * PropertySource backed by the current system properties. Other than having a |
| * higher priority over normal properties, this follows the same rules as |
| * {@link PropertiesPropertySource}. |
| * |
| * @since 2.10.0 |
| */ |
| public class SystemPropertiesPropertySource implements PropertySource { |
| |
| private static final int DEFAULT_PRIORITY = 100; |
| private static final String PREFIX = "log4j2."; |
| |
| @Override |
| public int getPriority() { |
| return DEFAULT_PRIORITY; |
| } |
| |
| @Override |
| public void forEach(final BiConsumer<String, String> action) { |
| final Properties properties; |
| try { |
| properties = System.getProperties(); |
| } catch (final SecurityException e) { |
| // (1) There is no status logger. |
| // (2) LowLevelLogUtil also consults system properties ("line.separator") to |
| // open a BufferedWriter, so this may fail as well. Just having a hard reference |
| // in this code to LowLevelLogUtil would cause a problem. |
| // (3) We could log to System.err (nah) or just be quiet as we do now. |
| return; |
| } |
| // Lock properties only long enough to get a thread-safe SAFE snapshot of its |
| // current keys, an array. |
| final Object[] keySet; |
| synchronized (properties) { |
| keySet = properties.keySet().toArray(); |
| } |
| // Then traverse for an unknown amount of time. |
| // Some keys may now be absent, in which case, the value is null. |
| for (final Object key : keySet) { |
| final String keyStr = Objects.toString(key, null); |
| action.accept(keyStr, properties.getProperty(keyStr)); |
| } |
| } |
| |
| @Override |
| public CharSequence getNormalForm(final Iterable<? extends CharSequence> tokens) { |
| return PREFIX + Util.joinAsCamelCase(tokens); |
| } |
| |
| } |