001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.camel.impl.osgi; 018 019 import java.io.BufferedInputStream; 020 import java.io.BufferedReader; 021 import java.io.IOException; 022 import java.io.InputStreamReader; 023 import java.net.URL; 024 import java.util.ArrayList; 025 import java.util.Collection; 026 import java.util.Dictionary; 027 import java.util.Enumeration; 028 import java.util.HashMap; 029 import java.util.Hashtable; 030 import java.util.LinkedHashSet; 031 import java.util.List; 032 import java.util.Map; 033 import java.util.Properties; 034 import java.util.Set; 035 import java.util.StringTokenizer; 036 import java.util.concurrent.ConcurrentHashMap; 037 038 import org.apache.camel.CamelContext; 039 import org.apache.camel.Component; 040 import org.apache.camel.Converter; 041 import org.apache.camel.TypeConverter; 042 import org.apache.camel.TypeConverterLoaderException; 043 import org.apache.camel.impl.converter.AnnotationTypeConverterLoader; 044 import org.apache.camel.impl.osgi.tracker.BundleTracker; 045 import org.apache.camel.impl.osgi.tracker.BundleTrackerCustomizer; 046 import org.apache.camel.impl.scan.AnnotatedWithPackageScanFilter; 047 import org.apache.camel.model.DataFormatDefinition; 048 import org.apache.camel.spi.ComponentResolver; 049 import org.apache.camel.spi.DataFormat; 050 import org.apache.camel.spi.DataFormatResolver; 051 import org.apache.camel.spi.Injector; 052 import org.apache.camel.spi.Language; 053 import org.apache.camel.spi.LanguageResolver; 054 import org.apache.camel.spi.PackageScanFilter; 055 import org.apache.camel.spi.TypeConverterLoader; 056 import org.apache.camel.spi.TypeConverterRegistry; 057 import org.apache.camel.util.IOHelper; 058 import org.apache.camel.util.ObjectHelper; 059 import org.apache.camel.util.StringHelper; 060 import org.osgi.framework.Bundle; 061 import org.osgi.framework.BundleActivator; 062 import org.osgi.framework.BundleContext; 063 import org.osgi.framework.BundleEvent; 064 import org.osgi.framework.ServiceRegistration; 065 066 import org.slf4j.Logger; 067 import org.slf4j.LoggerFactory; 068 069 public class Activator implements BundleActivator, BundleTrackerCustomizer { 070 071 public static final String META_INF_COMPONENT = "META-INF/services/org/apache/camel/component/"; 072 public static final String META_INF_LANGUAGE = "META-INF/services/org/apache/camel/language/"; 073 public static final String META_INF_LANGUAGE_RESOLVER = "META-INF/services/org/apache/camel/language/resolver/"; 074 public static final String META_INF_DATAFORMAT = "META-INF/services/org/apache/camel/dataformat/"; 075 public static final String META_INF_TYPE_CONVERTER = "META-INF/services/org/apache/camel/TypeConverter"; 076 public static final String META_INF_FALLBACK_TYPE_CONVERTER = "META-INF/services/org/apache/camel/FallbackTypeConverter"; 077 078 private static final transient Logger LOG = LoggerFactory.getLogger(Activator.class); 079 080 private BundleTracker tracker; 081 private Map<Long, List<BaseService>> resolvers = new ConcurrentHashMap<Long, List<BaseService>>(); 082 083 public void start(BundleContext context) throws Exception { 084 LOG.info("Camel activator starting"); 085 tracker = new BundleTracker(context, Bundle.ACTIVE, this); 086 tracker.open(); 087 LOG.info("Camel activator started"); 088 } 089 090 public void stop(BundleContext context) throws Exception { 091 LOG.info("Camel activator stopping"); 092 tracker.close(); 093 LOG.info("Camel activator stopped"); 094 } 095 096 public Object addingBundle(Bundle bundle, BundleEvent event) { 097 LOG.debug("Bundle started: {}", bundle.getSymbolicName()); 098 List<BaseService> r = new ArrayList<BaseService>(); 099 registerComponents(bundle, r); 100 registerLanguages(bundle, r); 101 registerDataFormats(bundle, r); 102 registerTypeConverterLoader(bundle, r); 103 for (BaseService service : r) { 104 service.register(); 105 } 106 resolvers.put(bundle.getBundleId(), r); 107 return bundle; 108 } 109 110 public void modifiedBundle(Bundle bundle, BundleEvent event, Object object) { 111 } 112 113 public void removedBundle(Bundle bundle, BundleEvent event, Object object) { 114 LOG.debug("Bundle stopped: {}", bundle.getSymbolicName()); 115 List<BaseService> r = resolvers.remove(bundle.getBundleId()); 116 if (r != null) { 117 for (BaseService service : r) { 118 service.unregister(); 119 } 120 } 121 } 122 123 protected void registerComponents(Bundle bundle, List<BaseService> resolvers) { 124 if (checkCompat(bundle, Component.class)) { 125 Map<String, String> components = new HashMap<String, String>(); 126 for (Enumeration<?> e = bundle.getEntryPaths(META_INF_COMPONENT); e != null && e.hasMoreElements();) { 127 String path = (String) e.nextElement(); 128 LOG.debug("Found entry: {} in bundle {}", path, bundle.getSymbolicName()); 129 String name = path.substring(path.lastIndexOf("/") + 1); 130 components.put(name, path); 131 } 132 if (!components.isEmpty()) { 133 resolvers.add(new BundleComponentResolver(bundle, components)); 134 } 135 } 136 } 137 138 protected void registerLanguages(Bundle bundle, List<BaseService> resolvers) { 139 if (checkCompat(bundle, Language.class)) { 140 Map<String, String> languages = new HashMap<String, String>(); 141 for (Enumeration<?> e = bundle.getEntryPaths(META_INF_LANGUAGE); e != null && e.hasMoreElements();) { 142 String path = (String) e.nextElement(); 143 LOG.debug("Found entry: {} in bundle {}", path, bundle.getSymbolicName()); 144 String name = path.substring(path.lastIndexOf("/") + 1); 145 languages.put(name, path); 146 } 147 if (!languages.isEmpty()) { 148 resolvers.add(new BundleLanguageResolver(bundle, languages)); 149 } 150 for (Enumeration<?> e = bundle.getEntryPaths(META_INF_LANGUAGE_RESOLVER); e != null && e.hasMoreElements();) { 151 String path = (String) e.nextElement(); 152 LOG.debug("Found entry: {} in bundle {}", path, bundle.getSymbolicName()); 153 String name = path.substring(path.lastIndexOf("/") + 1); 154 resolvers.add(new BundleMetaLanguageResolver(bundle, name, path)); 155 } 156 } 157 } 158 159 protected void registerDataFormats(Bundle bundle, List<BaseService> resolvers) { 160 if (checkCompat(bundle, DataFormat.class)) { 161 Map<String, String> dataformats = new HashMap<String, String>(); 162 for (Enumeration<?> e = bundle.getEntryPaths(META_INF_DATAFORMAT); e != null && e.hasMoreElements();) { 163 String path = (String) e.nextElement(); 164 LOG.debug("Found entry: {} in bundle {}", path, bundle.getSymbolicName()); 165 String name = path.substring(path.lastIndexOf("/") + 1); 166 dataformats.put(name, path); 167 } 168 if (!dataformats.isEmpty()) { 169 resolvers.add(new BundleDataFormatResolver(bundle, dataformats)); 170 } 171 } 172 } 173 174 protected void registerTypeConverterLoader(Bundle bundle, List<BaseService> resolvers) { 175 if (checkCompat(bundle, TypeConverter.class)) { 176 URL url1 = bundle.getEntry(META_INF_TYPE_CONVERTER); 177 URL url2 = bundle.getEntry(META_INF_FALLBACK_TYPE_CONVERTER); 178 if (url1 != null || url2 != null) { 179 resolvers.add(new BundleTypeConverterLoader(bundle)); 180 } 181 } 182 } 183 184 protected static class BundleComponentResolver extends BaseResolver<Component> implements ComponentResolver { 185 186 private final Map<String, String> components; 187 188 public BundleComponentResolver(Bundle bundle, Map<String, String> components) { 189 super(bundle, Component.class); 190 this.components = components; 191 } 192 193 public Component resolveComponent(String name, CamelContext context) throws Exception { 194 return createInstance(name, components.get(name), context); 195 } 196 197 public void register() { 198 doRegister(ComponentResolver.class, "component", components.keySet()); 199 } 200 } 201 202 protected static class BundleLanguageResolver extends BaseResolver<Language> implements LanguageResolver { 203 204 private final Map<String, String> languages; 205 206 public BundleLanguageResolver(Bundle bundle, Map<String, String> languages) { 207 super(bundle, Language.class); 208 this.languages = languages; 209 } 210 211 public Language resolveLanguage(String name, CamelContext context) { 212 return createInstance(name, languages.get(name), context); 213 } 214 215 public void register() { 216 doRegister(LanguageResolver.class, "language", languages.keySet()); 217 } 218 } 219 220 protected static class BundleMetaLanguageResolver extends BaseResolver<LanguageResolver> implements LanguageResolver { 221 222 private final String name; 223 private final String path; 224 225 public BundleMetaLanguageResolver(Bundle bundle, String name, String path) { 226 super(bundle, LanguageResolver.class); 227 this.name = name; 228 this.path = path; 229 } 230 231 public Language resolveLanguage(String name, CamelContext context) { 232 LanguageResolver resolver = createInstance(this.name, path, context); 233 return resolver.resolveLanguage(name, context); 234 } 235 236 public void register() { 237 doRegister(LanguageResolver.class, "resolver", name); 238 } 239 } 240 241 protected static class BundleDataFormatResolver extends BaseResolver<DataFormat> implements DataFormatResolver { 242 243 private final Map<String, String> dataformats; 244 245 public BundleDataFormatResolver(Bundle bundle, Map<String, String> dataformats) { 246 super(bundle, DataFormat.class); 247 this.dataformats = dataformats; 248 } 249 250 public DataFormat resolveDataFormat(String name, CamelContext context) { 251 return createInstance(name, dataformats.get(name), context); 252 } 253 254 public DataFormatDefinition resolveDataFormatDefinition(String name, CamelContext context) { 255 return null; 256 } 257 258 public void register() { 259 doRegister(DataFormatResolver.class, "dataformat", dataformats.keySet()); 260 } 261 } 262 263 protected static class BundleTypeConverterLoader extends BaseResolver<TypeConverter> implements TypeConverterLoader { 264 265 private final AnnotationTypeConverterLoader loader = new Loader(); 266 private final Bundle bundle; 267 268 public BundleTypeConverterLoader(Bundle bundle) { 269 super(bundle, TypeConverter.class); 270 ObjectHelper.notNull(bundle, "bundle"); 271 this.bundle = bundle; 272 } 273 274 public synchronized void load(TypeConverterRegistry registry) throws TypeConverterLoaderException { 275 // must be synchronized to ensure we don't load type converters concurrently 276 // which cause Camel apps to fails in OSGi thereafter 277 try { 278 loader.load(registry); 279 } catch (Exception e) { 280 throw new TypeConverterLoaderException("Cannot load type converters using OSGi bundle: " + bundle.getBundleId(), e); 281 } 282 } 283 284 public void register() { 285 doRegister(TypeConverterLoader.class); 286 } 287 288 class Loader extends AnnotationTypeConverterLoader { 289 290 Loader() { 291 super(null); 292 } 293 294 @SuppressWarnings("unchecked") 295 public void load(TypeConverterRegistry registry) throws TypeConverterLoaderException { 296 PackageScanFilter test = new AnnotatedWithPackageScanFilter(Converter.class, true); 297 Set<Class<?>> classes = new LinkedHashSet<Class<?>>(); 298 Set<String> packages = getConverterPackages(bundle.getEntry(META_INF_TYPE_CONVERTER)); 299 300 if (LOG.isTraceEnabled()) { 301 LOG.trace("Found {} {} packages: {}", new Object[]{packages.size(), META_INF_TYPE_CONVERTER, packages}); 302 } 303 // if we only have camel-core on the classpath then we have already pre-loaded all its type converters 304 // but we exposed the "org.apache.camel.core" package in camel-core. This ensures there is at least one 305 // packageName to scan, which triggers the scanning process. That allows us to ensure that we look for 306 // META-INF/services in all the JARs. 307 if (packages.size() == 1 && "org.apache.camel.core".equals(packages.iterator().next())) { 308 LOG.debug("No additional package names found in classpath for annotated type converters."); 309 // no additional package names found to load type converters so break out 310 return; 311 } 312 313 // now filter out org.apache.camel.core as its not needed anymore (it was just a dummy) 314 packages.remove("org.apache.camel.core"); 315 316 for (String pkg : packages) { 317 318 if (StringHelper.hasUpperCase(pkg)) { 319 // its a FQN class name so load it directly 320 LOG.trace("Loading {} class", pkg); 321 try { 322 Class<?> clazz = bundle.loadClass(pkg); 323 if (test.matches(clazz)) { 324 classes.add(clazz); 325 } 326 // the class could be found and loaded so continue to next 327 continue; 328 } catch (Throwable t) { 329 // Ignore 330 LOG.trace("Failed to load " + pkg + " class due " + t.getMessage() + ". This exception will be ignored.", t); 331 } 332 } 333 334 // its not a FQN but a package name so scan for classes in the bundle 335 Enumeration<URL> e = bundle.findEntries("/" + pkg.replace('.', '/'), "*.class", true); 336 while (e != null && e.hasMoreElements()) { 337 String path = e.nextElement().getPath(); 338 String externalName = path.substring(path.charAt(0) == '/' ? 1 : 0, path.indexOf('.')).replace('/', '.'); 339 LOG.trace("Loading {} class", externalName); 340 try { 341 Class<?> clazz = bundle.loadClass(externalName); 342 if (test.matches(clazz)) { 343 classes.add(clazz); 344 } 345 } catch (Throwable t) { 346 // Ignore 347 LOG.trace("Failed to load " + externalName + " class due " + t.getMessage() + ". This exception will be ignored.", t); 348 } 349 } 350 } 351 352 // load the classes into type converter registry 353 LOG.info("Found {} @Converter classes to load", classes.size()); 354 for (Class<?> type : classes) { 355 if (LOG.isTraceEnabled()) { 356 LOG.trace("Loading converter class: {}", ObjectHelper.name(type)); 357 } 358 loadConverterMethods(registry, type); 359 } 360 361 // register fallback converters 362 URL fallbackUrl = bundle.getEntry(META_INF_FALLBACK_TYPE_CONVERTER); 363 if (fallbackUrl != null) { 364 TypeConverter tc = createInstance("FallbackTypeConverter", fallbackUrl, registry.getInjector()); 365 registry.addFallbackTypeConverter(tc, false); 366 } 367 368 // now clear the maps so we do not hold references 369 visitedClasses.clear(); 370 visitedURIs.clear(); 371 } 372 } 373 374 } 375 376 protected abstract static class BaseResolver<T> extends BaseService { 377 378 private final Class<T> type; 379 380 public BaseResolver(Bundle bundle, Class<T> type) { 381 super(bundle); 382 this.type = type; 383 } 384 385 protected T createInstance(String name, String path, CamelContext context) { 386 if (path == null) { 387 return null; 388 } 389 URL url = bundle.getEntry(path); 390 LOG.debug("The entry {}'s url is {}", name, url); 391 return createInstance(name, url, context.getInjector()); 392 } 393 394 @SuppressWarnings("unchecked") 395 protected T createInstance(String name, URL url, Injector injector) { 396 try { 397 Properties properties = loadProperties(url); 398 String classname = (String) properties.get("class"); 399 Class<T> type = bundle.loadClass(classname); 400 if (!this.type.isAssignableFrom(type)) { 401 throw new IllegalArgumentException("Type is not a " + this.type.getName() + " implementation. Found: " + type.getName()); 402 } 403 return injector.newInstance(type); 404 } catch (ClassNotFoundException e) { 405 throw new IllegalArgumentException("Invalid URI, no " + this.type.getName() + " registered for scheme : " + name, e); 406 } 407 } 408 409 } 410 411 protected abstract static class BaseService { 412 413 protected final Bundle bundle; 414 private ServiceRegistration reg; 415 416 protected BaseService(Bundle bundle) { 417 this.bundle = bundle; 418 } 419 420 public abstract void register(); 421 422 protected void doRegister(Class<?> type, String key, Collection<String> value) { 423 doRegister(type, key, value.toArray(new String[value.size()])); 424 } 425 426 protected void doRegister(Class<?> type, String key, Object value) { 427 Hashtable<String, Object> props = new Hashtable<String, Object>(); 428 props.put(key, value); 429 doRegister(type, props); 430 } 431 432 protected void doRegister(Class<?> type) { 433 doRegister(type, null); 434 } 435 436 protected void doRegister(Class<?> type, Dictionary<?, ?> props) { 437 reg = bundle.getBundleContext().registerService(type.getName(), this, props); 438 } 439 440 public void unregister() { 441 reg.unregister(); 442 } 443 } 444 445 protected static Properties loadProperties(URL url) { 446 Properties properties = new Properties(); 447 BufferedInputStream reader = null; 448 try { 449 reader = IOHelper.buffered(url.openStream()); 450 properties.load(reader); 451 } catch (IOException e) { 452 throw new RuntimeException(e); 453 } finally { 454 IOHelper.close(reader, "properties", LOG); 455 } 456 return properties; 457 } 458 459 protected static boolean checkCompat(Bundle bundle, Class<?> clazz) { 460 // Check bundle compatibility 461 try { 462 if (bundle.loadClass(clazz.getName()) != clazz) { 463 return false; 464 } 465 } catch (Throwable t) { 466 return false; 467 } 468 return true; 469 } 470 471 protected static Set<String> getConverterPackages(URL resource) { 472 Set<String> packages = new LinkedHashSet<String>(); 473 if (resource != null) { 474 BufferedReader reader = null; 475 try { 476 reader = IOHelper.buffered(new InputStreamReader(resource.openStream())); 477 while (true) { 478 String line = reader.readLine(); 479 if (line == null) { 480 break; 481 } 482 line = line.trim(); 483 if (line.startsWith("#") || line.length() == 0) { 484 continue; 485 } 486 StringTokenizer iter = new StringTokenizer(line, ","); 487 while (iter.hasMoreTokens()) { 488 String name = iter.nextToken().trim(); 489 if (name.length() > 0) { 490 packages.add(name); 491 } 492 } 493 } 494 } catch (Exception ignore) { 495 // Do nothing here 496 } finally { 497 IOHelper.close(reader, null, LOG); 498 } 499 } 500 return packages; 501 } 502 503 } 504