2 * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
9 package org.opendaylight.bgpcep.config.loader.impl;
11 import static java.util.Objects.requireNonNull;
14 import java.io.FileInputStream;
15 import java.io.IOException;
16 import java.io.InputStream;
17 import java.net.URISyntaxException;
18 import java.nio.file.ClosedWatchServiceException;
19 import java.nio.file.WatchEvent;
20 import java.nio.file.WatchKey;
21 import java.nio.file.WatchService;
22 import java.util.HashMap;
24 import java.util.regex.Pattern;
25 import javax.annotation.concurrent.GuardedBy;
26 import javax.xml.parsers.ParserConfigurationException;
27 import javax.xml.stream.XMLInputFactory;
28 import javax.xml.stream.XMLStreamException;
29 import javax.xml.stream.XMLStreamReader;
30 import org.opendaylight.bgpcep.config.loader.spi.ConfigFileProcessor;
31 import org.opendaylight.bgpcep.config.loader.spi.ConfigLoader;
32 import org.opendaylight.mdsal.binding.dom.codec.api.BindingNormalizedNodeSerializer;
33 import org.opendaylight.yangtools.concepts.AbstractRegistration;
34 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
35 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
36 import org.opendaylight.yangtools.yang.data.codec.xml.XmlParserStream;
37 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
38 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
39 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
40 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
41 import org.opendaylight.yangtools.yang.model.util.SchemaContextUtil;
42 import org.slf4j.Logger;
43 import org.slf4j.LoggerFactory;
44 import org.xml.sax.SAXException;
46 public final class ConfigLoaderImpl implements ConfigLoader, AutoCloseable {
47 private static final Logger LOG = LoggerFactory.getLogger(ConfigLoaderImpl.class);
48 private static final String INTERRUPTED = "InterruptedException";
49 private static final String EXTENSION = "-.*\\.xml";
50 private static final String INITIAL = "^";
52 private final Map<String, ConfigFileProcessor> configServices = new HashMap<>();
53 private final SchemaContext schemaContext;
54 private final BindingNormalizedNodeSerializer bindingSerializer;
55 private final String path;
56 private final Thread watcherThread;
58 private boolean closed = false;
60 public ConfigLoaderImpl(final SchemaContext schemaContext, final BindingNormalizedNodeSerializer bindingSerializer,
61 final FileWatcher fileWatcher) {
62 this.schemaContext = requireNonNull(schemaContext);
63 this.bindingSerializer = requireNonNull(bindingSerializer);
64 this.path = requireNonNull(fileWatcher.getPathFile());
65 this.watcherThread = new Thread(new ConfigLoaderImplRunnable(requireNonNull(fileWatcher.getWatchService())));
69 this.watcherThread.start();
70 LOG.info("Config Loader service initiated");
73 private void handleConfigFile(final ConfigFileProcessor config, final String filename) {
74 final NormalizedNode<?, ?> dto;
76 dto = parseDefaultConfigFile(config, filename);
77 } catch (final IOException | XMLStreamException e) {
78 LOG.warn("Failed to parse config file {}", filename, e);
81 LOG.info("Loading initial config {}", filename);
82 config.loadConfiguration(dto);
85 private NormalizedNode<?, ?> parseDefaultConfigFile(final ConfigFileProcessor config, final String filename)
86 throws IOException, XMLStreamException {
87 final NormalizedNodeResult result = new NormalizedNodeResult();
88 final NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(result);
90 try (InputStream resourceAsStream = new FileInputStream(new File(this.path, filename))) {
91 final XMLInputFactory factory = XMLInputFactory.newInstance();
92 final XMLStreamReader reader = factory.createXMLStreamReader(resourceAsStream);
94 final SchemaNode schemaNode = SchemaContextUtil
95 .findDataSchemaNode(this.schemaContext, config.getSchemaPath());
96 try (XmlParserStream xmlParser = XmlParserStream.create(streamWriter, this.schemaContext, schemaNode)) {
97 xmlParser.parse(reader);
98 } catch (final URISyntaxException | XMLStreamException | IOException | ParserConfigurationException
100 LOG.warn("Failed to parse xml", e);
106 return result.getResult();
110 public synchronized AbstractRegistration registerConfigFile(final ConfigFileProcessor config) {
111 final String pattern = INITIAL + config.getSchemaPath().getLastComponent().getLocalName() + EXTENSION;
112 this.configServices.put(pattern, config);
114 final File[] fList = new File(this.path).listFiles();
116 for (final File file : fList) {
118 final String filename = file.getName();
119 if (Pattern.matches(pattern, filename)) {
120 handleConfigFile(config, filename);
126 return new AbstractRegistration() {
128 protected void removeRegistration() {
129 synchronized (ConfigLoaderImpl.this) {
130 ConfigLoaderImpl.this.configServices.remove(pattern);
137 public BindingNormalizedNodeSerializer getBindingNormalizedNodeSerializer() {
138 return this.bindingSerializer;
143 public synchronized void close() throws Exception {
144 LOG.info("Config Loader service closed");
146 this.watcherThread.interrupt();
149 private class ConfigLoaderImplRunnable implements Runnable {
151 private final WatchService watchService;
153 ConfigLoaderImplRunnable(final WatchService watchService) {
154 this.watchService = watchService;
159 while (!Thread.currentThread().isInterrupted()) {
164 private synchronized void handleChanges() {
167 key = this.watchService.take();
168 } catch (final InterruptedException | ClosedWatchServiceException e) {
169 if (!ConfigLoaderImpl.this.closed) {
170 LOG.warn(INTERRUPTED, e);
171 Thread.currentThread().interrupt();
177 for (final WatchEvent<?> event : key.pollEvents()) {
178 handleEvent(event.context().toString());
180 final boolean reset = key.reset();
182 LOG.warn("Could not reset the watch key.");
187 private synchronized void handleEvent(final String filename) {
188 ConfigLoaderImpl.this.configServices.entrySet().stream()
189 .filter(entry -> Pattern.matches(entry.getKey(), filename))
190 .forEach(entry -> handleConfigFile(entry.getValue(), filename));