| /* |
| * 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.knox.gateway.topology.discovery.advanced; |
| |
| import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor; |
| |
| import java.io.File; |
| import java.io.FileFilter; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.nio.file.attribute.FileTime; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Properties; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.commons.io.filefilter.PrefixFileFilter; |
| import org.apache.commons.lang3.concurrent.BasicThreadFactory; |
| import org.apache.knox.gateway.config.GatewayConfig; |
| import org.apache.knox.gateway.i18n.messages.MessagesFactory; |
| |
| /** |
| * Monitoring <code>$KNOX_CONF_DIR/auto-discovery-advanced-configuration.properties</code> (if exists) and notifies any |
| * {@link AdvancedServiceDiscoveryConfigChangeListener} if the file is changed since the last time it was loaded |
| * |
| */ |
| public class AdvancedServiceDiscoveryConfigurationMonitor { |
| |
| private static final String ADVANCED_CONFIGURATION_FILE_NAME_PREFIX = "auto-discovery-advanced-configuration-"; |
| private static final AdvanceServiceDiscoveryConfigurationMessages LOG = MessagesFactory.get(AdvanceServiceDiscoveryConfigurationMessages.class); |
| |
| private final List<AdvancedServiceDiscoveryConfigChangeListener> listeners; |
| private final String gatewayConfigurationDir; |
| private final long monitoringInterval; |
| private final Map<Path, FileTime> lastReloadTimes; |
| |
| public AdvancedServiceDiscoveryConfigurationMonitor(GatewayConfig gatewayConfig) { |
| this.gatewayConfigurationDir = gatewayConfig.getGatewayConfDir(); |
| this.monitoringInterval = gatewayConfig.getClouderaManagerAdvancedServiceDiscoveryConfigurationMonitoringInterval(); |
| this.listeners = new ArrayList<>(); |
| this.lastReloadTimes = new ConcurrentHashMap<>(); |
| } |
| |
| public void init() { |
| monitorAdvancedServiceConfigurations(); |
| setupMonitor(); |
| } |
| |
| private void setupMonitor() { |
| if (monitoringInterval > 0) { |
| final ScheduledExecutorService executorService = newSingleThreadScheduledExecutor(new BasicThreadFactory.Builder().namingPattern("AdvancedServiceDiscoveryConfigurationMonitor-%d").build()); |
| executorService.scheduleAtFixedRate(() -> monitorAdvancedServiceConfigurations(), 0, monitoringInterval, TimeUnit.MILLISECONDS); |
| LOG.monitorStarted(gatewayConfigurationDir, ADVANCED_CONFIGURATION_FILE_NAME_PREFIX); |
| } else { |
| LOG.disableMonitoring(); |
| } |
| } |
| |
| public void registerListener(AdvancedServiceDiscoveryConfigChangeListener listener) { |
| listeners.add(listener); |
| } |
| |
| private void monitorAdvancedServiceConfigurations() { |
| final File[] advancedConfigurationFiles = new File(gatewayConfigurationDir).listFiles((FileFilter) new PrefixFileFilter(ADVANCED_CONFIGURATION_FILE_NAME_PREFIX)); |
| if (advancedConfigurationFiles != null) { |
| for (File advancedConfigurationFile : advancedConfigurationFiles) { |
| monitorAdvancedServiceConfiguration(Paths.get(advancedConfigurationFile.getAbsolutePath())); |
| } |
| } |
| } |
| |
| private void monitorAdvancedServiceConfiguration(Path resourcePath) { |
| try { |
| if (Files.exists(resourcePath) && Files.isReadable(resourcePath)) { |
| FileTime lastModifiedTime = Files.getLastModifiedTime(resourcePath); |
| FileTime lastReloadTime = lastReloadTimes.get(resourcePath); |
| if (lastReloadTime == null || lastReloadTime.compareTo(lastModifiedTime) < 0) { |
| lastReloadTimes.put(resourcePath, lastModifiedTime); |
| try (InputStream advanceconfigurationFileInputStream = Files.newInputStream(resourcePath)) { |
| Properties properties = new Properties(); |
| properties.load(advanceconfigurationFileInputStream); |
| notifyListeners(resourcePath.toString(), properties); |
| } |
| } |
| } |
| } catch (IOException e) { |
| LOG.failedToMonitorClouderaManagerAdvancedConfiguration(e.getMessage(), e); |
| } |
| } |
| |
| private void notifyListeners(String path, Properties properties) { |
| LOG.notifyListeners(path); |
| listeners.forEach(listener -> listener.onAdvancedServiceDiscoveryConfigurationChange(properties)); |
| } |
| |
| } |