| /* |
| * 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.core.util; |
| |
| import java.io.File; |
| import java.util.Date; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.ScheduledFuture; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.logging.log4j.Logger; |
| import org.apache.logging.log4j.core.AbstractLifeCycle; |
| import org.apache.logging.log4j.core.config.ConfigurationScheduler; |
| import org.apache.logging.log4j.status.StatusLogger; |
| |
| /** |
| * Manages {@link FileWatcher}s. |
| * |
| * @see FileWatcher |
| * @see ConfigurationScheduler |
| */ |
| public class WatchManager extends AbstractLifeCycle { |
| |
| private static Logger logger = StatusLogger.getLogger(); |
| private final ConcurrentMap<File, FileMonitor> watchers = new ConcurrentHashMap<>(); |
| private int intervalSeconds = 0; |
| private ScheduledFuture<?> future; |
| private final ConfigurationScheduler scheduler; |
| |
| public WatchManager(final ConfigurationScheduler scheduler) { |
| this.scheduler = scheduler; |
| } |
| |
| /** |
| * Resets all file monitors to their current last modified time. If this manager does not watch any file, nothing |
| * happens. |
| * <p> |
| * This allows you to start, stop, reset and start again a manager, without triggering file modified events if the a |
| * watched file has changed during the period of time when the manager was stopped. |
| * </p> |
| * |
| * @since 2.11.0 |
| */ |
| public void reset() { |
| logger.debug("Resetting {}", this); |
| for (final File file : watchers.keySet()) { |
| reset(file); |
| } |
| } |
| |
| /** |
| * Resets the file monitor for the given file being watched to its current last modified time. If this manager does |
| * not watch the given file, nothing happens. |
| * <p> |
| * This allows you to start, stop, reset and start again a manager, without triggering file modified events if the |
| * given watched file has changed during the period of time when the manager was stopped. |
| * </p> |
| * |
| * @param file |
| * the file for the monitor to reset. |
| * @since 2.11.0 |
| */ |
| public void reset(final File file) { |
| if (file == null) { |
| return; |
| } |
| final FileMonitor fileMonitor = watchers.get(file); |
| if (fileMonitor != null) { |
| final long lastModifiedMillis = file.lastModified(); |
| if (lastModifiedMillis != fileMonitor.lastModifiedMillis) { |
| if (logger.isDebugEnabled()) { |
| logger.debug("Resetting file monitor for '{}' from {} ({}) to {} ({})", file, |
| millisToString(fileMonitor.lastModifiedMillis), fileMonitor.lastModifiedMillis, |
| millisToString(lastModifiedMillis), lastModifiedMillis); |
| } |
| fileMonitor.setLastModifiedMillis(lastModifiedMillis); |
| } |
| } |
| } |
| |
| public void setIntervalSeconds(final int intervalSeconds) { |
| if (!isStarted()) { |
| if (this.intervalSeconds > 0 && intervalSeconds == 0) { |
| scheduler.decrementScheduledItems(); |
| } else if (this.intervalSeconds == 0 && intervalSeconds > 0) { |
| scheduler.incrementScheduledItems(); |
| } |
| this.intervalSeconds = intervalSeconds; |
| } |
| } |
| |
| /** |
| * Gets how often this manager checks for file modifications. |
| * |
| * @return how often, in seconds, this manager checks for file modifications. |
| */ |
| public int getIntervalSeconds() { |
| return this.intervalSeconds; |
| } |
| |
| @Override |
| public void start() { |
| super.start(); |
| if (intervalSeconds > 0) { |
| future = scheduler.scheduleWithFixedDelay(new WatchRunnable(), intervalSeconds, intervalSeconds, |
| TimeUnit.SECONDS); |
| } |
| } |
| |
| @Override |
| public boolean stop(final long timeout, final TimeUnit timeUnit) { |
| setStopping(); |
| final boolean stopped = stop(future); |
| setStopped(); |
| return stopped; |
| } |
| |
| /** |
| * Unwatches the given file. |
| * |
| * @param file |
| * the file to stop watching. |
| * @since 2.11.0 |
| */ |
| public void unwatchFile(final File file) { |
| logger.debug("Unwatching file '{}'", file); |
| watchers.remove(file); |
| } |
| |
| /** |
| * Watches the given file. |
| * |
| * @param file |
| * the file to watch. |
| * @param watcher |
| * the watcher to notify of file changes. |
| */ |
| public void watchFile(final File file, final FileWatcher watcher) { |
| final long lastModified = file.lastModified(); |
| if (logger.isDebugEnabled()) { |
| logger.debug("Watching file '{}' for lastModified {} ({})", file, millisToString(lastModified), lastModified); |
| } |
| watchers.put(file, new FileMonitor(lastModified, watcher)); |
| } |
| |
| public Map<File, FileWatcher> getWatchers() { |
| final Map<File, FileWatcher> map = new HashMap<>(watchers.size()); |
| for (final Map.Entry<File, FileMonitor> entry : watchers.entrySet()) { |
| map.put(entry.getKey(), entry.getValue().fileWatcher); |
| } |
| return map; |
| } |
| |
| private String millisToString(final long millis) { |
| return new Date(millis).toString(); |
| } |
| |
| private final class WatchRunnable implements Runnable { |
| |
| // Use a hard class reference here in case a refactoring changes the class name. |
| private final String SIMPLE_NAME = WatchRunnable.class.getSimpleName(); |
| |
| @Override |
| public void run() { |
| logger.trace("{} run triggered.", SIMPLE_NAME); |
| for (final Map.Entry<File, FileMonitor> entry : watchers.entrySet()) { |
| final File file = entry.getKey(); |
| final FileMonitor fileMonitor = entry.getValue(); |
| final long lastModfied = file.lastModified(); |
| if (fileModified(fileMonitor, lastModfied)) { |
| if (logger.isInfoEnabled()) { |
| logger.info("File '{}' was modified on {} ({}), previous modification was on {} ({})", file, |
| millisToString(lastModfied), lastModfied, millisToString(fileMonitor.lastModifiedMillis), |
| fileMonitor.lastModifiedMillis); |
| } |
| fileMonitor.lastModifiedMillis = lastModfied; |
| fileMonitor.fileWatcher.fileModified(file); |
| } |
| } |
| logger.trace("{} run ended.", SIMPLE_NAME); |
| } |
| |
| private boolean fileModified(final FileMonitor fileMonitor, final long lastModifiedMillis) { |
| return lastModifiedMillis != fileMonitor.lastModifiedMillis; |
| } |
| } |
| |
| private final class FileMonitor { |
| private final FileWatcher fileWatcher; |
| private volatile long lastModifiedMillis; |
| |
| public FileMonitor(final long lastModifiedMillis, final FileWatcher fileWatcher) { |
| this.fileWatcher = fileWatcher; |
| this.lastModifiedMillis = lastModifiedMillis; |
| } |
| |
| private void setLastModifiedMillis(final long lastModifiedMillis) { |
| this.lastModifiedMillis = lastModifiedMillis; |
| } |
| |
| @Override |
| public String toString() { |
| return "FileMonitor [fileWatcher=" + fileWatcher + ", lastModifiedMillis=" + lastModifiedMillis + "]"; |
| } |
| |
| } |
| |
| @Override |
| public String toString() { |
| return "WatchManager [intervalSeconds=" + intervalSeconds + ", watchers=" + watchers + ", scheduler=" |
| + scheduler + ", future=" + future + "]"; |
| } |
| } |