/*
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* Copyright 2011 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.util.Map;
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import java.util.Properties;
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import com.gitblit.utils.FileUtils;
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/**
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* Dynamically loads and reloads a properties file by keeping track of the last
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* modification date.
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*
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* @author James Moger
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*
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*/
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public class FileSettings extends IStoredSettings {
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protected final File propertiesFile;
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private final Properties properties = new Properties();
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private volatile long lastModified;
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private volatile boolean forceReload;
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public FileSettings(String file) {
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super(FileSettings.class);
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this.propertiesFile = new File(file);
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}
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/**
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* Returns a properties object which contains the most recent contents of
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* the properties file.
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*/
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@Override
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protected synchronized Properties read() {
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if (propertiesFile.exists() && (forceReload || (propertiesFile.lastModified() > lastModified))) {
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FileInputStream is = null;
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try {
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Properties props = new Properties();
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is = new FileInputStream(propertiesFile);
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props.load(is);
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// load properties after we have successfully read file
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properties.clear();
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properties.putAll(props);
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lastModified = propertiesFile.lastModified();
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forceReload = false;
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} catch (FileNotFoundException f) {
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// IGNORE - won't happen because file.exists() check above
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} catch (Throwable t) {
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logger.error("Failed to read " + propertiesFile.getName(), t);
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} finally {
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if (is != null) {
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try {
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is.close();
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} catch (Throwable t) {
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// IGNORE
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}
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}
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}
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}
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return properties;
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}
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/**
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* Updates the specified settings in the settings file.
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*/
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public synchronized boolean saveSettings(Map<String, String> settings) {
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String content = FileUtils.readContent(propertiesFile, "\n");
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for (Map.Entry<String, String> setting:settings.entrySet()) {
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String regex = "(?m)^(" + regExEscape(setting.getKey()) + "\\s*+=\\s*+)"
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+ "(?:[^\r\n\\\\]++|\\\\(?:\r?\n|\r|.))*+$";
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String oldContent = content;
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content = content.replaceAll(regex, setting.getKey() + " = " + setting.getValue());
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if (content.equals(oldContent)) {
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// did not replace value because it does not exist in the file
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// append new setting to content (issue-85)
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content += "\n" + setting.getKey() + " = " + setting.getValue();
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}
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}
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FileUtils.writeContent(propertiesFile, content);
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// manually set the forceReload flag because not all JVMs support real
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// millisecond resolution of lastModified. (issue-55)
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forceReload = true;
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return true;
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}
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private String regExEscape(String input) {
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return input.replace(".", "\\.").replace("$", "\\$").replace("{", "\\{");
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}
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/**
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* @return the last modification date of the properties file
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*/
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protected long lastModified() {
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return lastModified;
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}
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/**
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* @return the state of the force reload flag
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*/
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protected boolean forceReload() {
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return forceReload;
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}
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@Override
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public String toString() {
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return propertiesFile.getAbsolutePath();
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}
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}
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