Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
| 3 | * or more contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. The ASF licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.apache.felix.dm.impl; |
| 20 | |
| 21 | import static org.apache.felix.dm.ComponentState.INACTIVE; |
| 22 | import static org.apache.felix.dm.ComponentState.INSTANTIATED_AND_WAITING_FOR_REQUIRED; |
| 23 | import static org.apache.felix.dm.ComponentState.TRACKING_OPTIONAL; |
| 24 | import static org.apache.felix.dm.ComponentState.WAITING_FOR_REQUIRED; |
| 25 | |
| 26 | import java.lang.reflect.Constructor; |
| 27 | import java.lang.reflect.InvocationTargetException; |
| 28 | import java.lang.reflect.Method; |
| 29 | import java.lang.reflect.Proxy; |
| 30 | import java.util.ArrayList; |
| 31 | import java.util.Arrays; |
| 32 | import java.util.Dictionary; |
| 33 | import java.util.Enumeration; |
| 34 | import java.util.HashMap; |
| 35 | import java.util.Hashtable; |
| 36 | import java.util.List; |
| 37 | import java.util.Map; |
| 38 | import java.util.Set; |
| 39 | import java.util.concurrent.ConcurrentHashMap; |
| 40 | import java.util.concurrent.ConcurrentSkipListSet; |
| 41 | import java.util.concurrent.CopyOnWriteArrayList; |
| 42 | import java.util.concurrent.Executor; |
| 43 | import java.util.concurrent.atomic.AtomicBoolean; |
| 44 | import java.util.concurrent.atomic.AtomicLong; |
| 45 | |
| 46 | import org.apache.felix.dm.Component; |
| 47 | import org.apache.felix.dm.ComponentDeclaration; |
| 48 | import org.apache.felix.dm.ComponentDependencyDeclaration; |
| 49 | import org.apache.felix.dm.ComponentState; |
| 50 | import org.apache.felix.dm.ComponentStateListener; |
| 51 | import org.apache.felix.dm.Dependency; |
| 52 | import org.apache.felix.dm.DependencyManager; |
| 53 | import org.apache.felix.dm.Logger; |
| 54 | import org.apache.felix.dm.context.ComponentContext; |
| 55 | import org.apache.felix.dm.context.DependencyContext; |
| 56 | import org.apache.felix.dm.context.EventType; |
| 57 | import org.apache.felix.dm.context.Event; |
| 58 | import org.osgi.framework.Bundle; |
| 59 | import org.osgi.framework.BundleContext; |
| 60 | import org.osgi.framework.ServiceRegistration; |
| 61 | import org.osgi.service.log.LogService; |
| 62 | |
| 63 | /** |
| 64 | * Dependency Manager Component implementation. |
| 65 | * |
| 66 | * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| 67 | */ |
| 68 | public class ComponentImpl implements Component, ComponentContext, ComponentDeclaration { |
| 69 | private static final ServiceRegistration NULL_REGISTRATION = (ServiceRegistration) Proxy |
| 70 | .newProxyInstance(ComponentImpl.class.getClassLoader(), |
| 71 | new Class[] { ServiceRegistration.class }, |
| 72 | new DefaultNullObject()); |
| 73 | private static final Class<?>[] VOID = new Class[] {}; |
| 74 | private volatile Executor m_executor = new SerialExecutor(new Logger(null)); |
| 75 | private ComponentState m_state = ComponentState.INACTIVE; |
| 76 | private final CopyOnWriteArrayList<DependencyContext> m_dependencies = new CopyOnWriteArrayList<>(); |
| 77 | private final List<ComponentStateListener> m_listeners = new CopyOnWriteArrayList<>(); |
| 78 | private boolean m_isStarted; |
| 79 | private final Logger m_logger; |
| 80 | private final BundleContext m_context; |
| 81 | private final DependencyManager m_manager; |
| 82 | private Object m_componentDefinition; |
| 83 | private Object m_componentInstance; |
| 84 | private volatile Object m_serviceName; |
| 85 | private volatile Dictionary<Object, Object> m_serviceProperties; |
| 86 | private volatile ServiceRegistration m_registration; |
| 87 | private final Map<Class<?>, Boolean> m_autoConfig = new ConcurrentHashMap<>(); |
| 88 | private final Map<Class<?>, String> m_autoConfigInstance = new ConcurrentHashMap<>(); |
| 89 | private final Map<String, Long> m_stopwatch = new ConcurrentHashMap<>(); |
| 90 | private final long m_id; |
| 91 | private static AtomicLong m_idGenerator = new AtomicLong(); |
| 92 | // Holds all the services of a given dependency context. Caution: the last entry in the skiplist is the highest ranked service. |
| 93 | private final Map<DependencyContext, ConcurrentSkipListSet<Event>> m_dependencyEvents = new HashMap<>(); |
| 94 | private final AtomicBoolean m_active = new AtomicBoolean(false); |
| 95 | |
| 96 | public Component setDebug(String debugKey) { |
| 97 | // Force debug level in our logger |
| 98 | m_logger.setEnabledLevel(LogService.LOG_DEBUG); |
| 99 | m_logger.setDebugKey(debugKey); |
| 100 | return this; |
| 101 | } |
| 102 | |
| 103 | // configuration (static) |
| 104 | private volatile String m_callbackInit; |
| 105 | private volatile String m_callbackStart; |
| 106 | private volatile String m_callbackStop; |
| 107 | private volatile String m_callbackDestroy; |
| 108 | private volatile Object m_callbackInstance; |
| 109 | |
| 110 | // instance factory |
| 111 | private volatile Object m_instanceFactory; |
| 112 | private volatile String m_instanceFactoryCreateMethod; |
| 113 | |
| 114 | // composition manager |
| 115 | private volatile Object m_compositionManager; |
| 116 | private volatile String m_compositionManagerGetMethod; |
| 117 | private volatile Object m_compositionManagerInstance; |
| 118 | private final Bundle m_bundle; |
| 119 | |
| 120 | static class SCDImpl implements ComponentDependencyDeclaration { |
| 121 | private final String m_name; |
| 122 | private final int m_state; |
| 123 | private final String m_type; |
| 124 | |
| 125 | public SCDImpl(String name, int state, String type) { |
| 126 | m_name = name; |
| 127 | m_state = state; |
| 128 | m_type = type; |
| 129 | } |
| 130 | |
| 131 | public String getName() { |
| 132 | return m_name; |
| 133 | } |
| 134 | |
| 135 | public String getSimpleName() { |
| 136 | return m_name; |
| 137 | } |
| 138 | |
| 139 | public String getFilter() { |
| 140 | return null; |
| 141 | } |
| 142 | |
| 143 | public int getState() { |
| 144 | return m_state; |
| 145 | } |
| 146 | |
| 147 | public String getType() { |
| 148 | return m_type; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | public ComponentImpl() { |
| 153 | this(null, null, new Logger(null)); |
| 154 | } |
| 155 | |
| 156 | public ComponentImpl(BundleContext context, DependencyManager manager, Logger logger) { |
| 157 | m_context = context; |
| 158 | m_bundle = context != null ? context.getBundle() : null; |
| 159 | m_manager = manager; |
| 160 | m_logger = logger; |
| 161 | m_autoConfig.put(BundleContext.class, Boolean.TRUE); |
| 162 | m_autoConfig.put(ServiceRegistration.class, Boolean.TRUE); |
| 163 | m_autoConfig.put(DependencyManager.class, Boolean.TRUE); |
| 164 | m_autoConfig.put(Component.class, Boolean.TRUE); |
| 165 | m_callbackInit = "init"; |
| 166 | m_callbackStart = "start"; |
| 167 | m_callbackStop = "stop"; |
| 168 | m_callbackDestroy = "destroy"; |
| 169 | m_id = m_idGenerator.getAndIncrement(); |
| 170 | } |
| 171 | |
| 172 | @Override |
| 173 | public Component add(final Dependency ... dependencies) { |
| 174 | getExecutor().execute(new Runnable() { |
| 175 | @Override |
| 176 | public void run() { |
| 177 | List<DependencyContext> instanceBoundDeps = new ArrayList<>(); |
| 178 | for (Dependency d : dependencies) { |
| 179 | DependencyContext dc = (DependencyContext) d; |
| 180 | if (dc.getComponentContext() != null) { |
| 181 | m_logger.err("%s can't be added to %s (dependency already added to another component).", dc, |
| 182 | ComponentImpl.this); |
| 183 | continue; |
| 184 | } |
| 185 | m_dependencyEvents.put(dc, new ConcurrentSkipListSet<Event>()); |
| 186 | m_dependencies.add(dc); |
| 187 | dc.setComponentContext(ComponentImpl.this); |
| 188 | if (!(m_state == ComponentState.INACTIVE)) { |
| 189 | dc.setInstanceBound(true); |
| 190 | instanceBoundDeps.add(dc); |
| 191 | } |
| 192 | } |
| 193 | startDependencies(instanceBoundDeps); |
| 194 | handleChange(); |
| 195 | } |
| 196 | }); |
| 197 | return this; |
| 198 | } |
| 199 | |
| 200 | @Override |
| 201 | public Component remove(final Dependency d) { |
| 202 | getExecutor().execute(new Runnable() { |
| 203 | @Override |
| 204 | public void run() { |
| 205 | DependencyContext dc = (DependencyContext) d; |
| 206 | // First remove this dependency from the dependency list |
| 207 | m_dependencies.remove(d); |
| 208 | // Now we can stop the dependency (our component won't be deactivated, it will only be unbound with |
| 209 | // the removed dependency). |
| 210 | if (!(m_state == ComponentState.INACTIVE)) { |
| 211 | dc.stop(); |
| 212 | } |
| 213 | // Finally, cleanup the dependency events. |
| 214 | m_dependencyEvents.remove(d); |
| 215 | handleChange(); |
| 216 | } |
| 217 | }); |
| 218 | return this; |
| 219 | } |
| 220 | |
| 221 | public void start() { |
| 222 | if (m_active.compareAndSet(false, true)) { |
| 223 | getExecutor().execute(new Runnable() { |
| 224 | @Override |
| 225 | public void run() { |
| 226 | m_isStarted = true; |
| 227 | handleChange(); |
| 228 | } |
| 229 | }); |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | public void stop() { |
| 234 | if (m_active.compareAndSet(true, false)) { |
| 235 | Executor executor = getExecutor(); |
| 236 | |
| 237 | // First, declare the task that will stop our component in our executor. |
| 238 | final Runnable stopTask = new Runnable() { |
| 239 | @Override |
| 240 | public void run() { |
| 241 | m_isStarted = false; |
| 242 | handleChange(); |
| 243 | } |
| 244 | }; |
| 245 | |
| 246 | // Now, we have to schedule our stopTask in our component executor. But we have to handle a special case: |
| 247 | // if the component bundle is stopping *AND* if the executor is a parallel dispatcher, then we want |
| 248 | // to invoke our stopTask synchronously, in order to make sure that the bundle context is valid while our |
| 249 | // component is being deactivated (if we stop the component asynchronously, the bundle context may be invalidated |
| 250 | // before our component is stopped, and we don't want to be in this situation). |
| 251 | |
| 252 | boolean stopping = m_bundle != null /* null only in tests env */ && m_bundle.getState() == Bundle.STOPPING; |
| 253 | if (stopping && executor instanceof DispatchExecutor) { |
| 254 | ((DispatchExecutor) executor).execute(stopTask, false /* try to execute synchronously, not using threadpool */); |
| 255 | } else { |
| 256 | executor.execute(stopTask); |
| 257 | } |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | @SuppressWarnings("unchecked") |
| 262 | @Override |
| 263 | public Component setInterface(String serviceName, Dictionary<?, ?> properties) { |
| 264 | ensureNotActive(); |
| 265 | m_serviceName = serviceName; |
| 266 | m_serviceProperties = (Dictionary<Object, Object>) properties; |
| 267 | return this; |
| 268 | } |
| 269 | |
| 270 | @SuppressWarnings("unchecked") |
| 271 | @Override |
| 272 | public Component setInterface(String[] serviceName, Dictionary<?, ?> properties) { |
| 273 | ensureNotActive(); |
| 274 | m_serviceName = serviceName; |
| 275 | m_serviceProperties = (Dictionary<Object, Object>) properties; |
| 276 | return this; |
| 277 | } |
| 278 | |
| 279 | @Override |
| 280 | public void handleEvent(final DependencyContext dc, final EventType type, final Event... event) { |
| 281 | // since this method can be invoked by anyone from any thread, we need to |
| 282 | // pass on the event to a runnable that we execute using the component's |
| 283 | // executor |
| 284 | getExecutor().execute(new Runnable() { |
| 285 | @Override |
| 286 | public void run() { |
| 287 | switch (type) { |
| 288 | case ADDED: |
| 289 | handleAdded(dc, event[0]); |
| 290 | break; |
| 291 | case CHANGED: |
| 292 | handleChanged(dc, event[0]); |
| 293 | break; |
| 294 | case REMOVED: |
| 295 | handleRemoved(dc, event[0]); |
| 296 | break; |
| 297 | case SWAPPED: |
| 298 | handleSwapped(dc, event[0], event[1]); |
| 299 | break; |
| 300 | } |
| 301 | } |
| 302 | }); |
| 303 | } |
| 304 | |
| 305 | @Override |
| 306 | public Event getDependencyEvent(DependencyContext dc) { |
| 307 | ConcurrentSkipListSet<Event> events = m_dependencyEvents.get(dc); |
| 308 | return events.size() > 0 ? events.last() : null; |
| 309 | } |
| 310 | |
| 311 | @Override |
| 312 | public Set<Event> getDependencyEvents(DependencyContext dc) { |
| 313 | return m_dependencyEvents.get(dc); |
| 314 | } |
| 315 | |
| 316 | public Component setAutoConfig(Class<?> clazz, boolean autoConfig) { |
| 317 | m_autoConfig.put(clazz, Boolean.valueOf(autoConfig)); |
| 318 | return this; |
| 319 | } |
| 320 | |
| 321 | public Component setAutoConfig(Class<?> clazz, String instanceName) { |
| 322 | m_autoConfig.put(clazz, Boolean.valueOf(instanceName != null)); |
| 323 | m_autoConfigInstance.put(clazz, instanceName); |
| 324 | return this; |
| 325 | } |
| 326 | |
| 327 | public boolean getAutoConfig(Class<?> clazz) { |
| 328 | Boolean result = (Boolean) m_autoConfig.get(clazz); |
| 329 | return (result != null && result.booleanValue()); |
| 330 | } |
| 331 | |
| 332 | public String getAutoConfigInstance(Class<?> clazz) { |
| 333 | return (String) m_autoConfigInstance.get(clazz); |
| 334 | } |
| 335 | |
| 336 | private void handleAdded(DependencyContext dc, Event e) { |
| 337 | if (! m_isStarted) { |
| 338 | return; |
| 339 | } |
| 340 | m_logger.debug("handleAdded %s", e); |
| 341 | |
| 342 | Set<Event> dependencyEvents = m_dependencyEvents.get(dc); |
| 343 | dependencyEvents.add(e); |
| 344 | dc.setAvailable(true); |
| 345 | |
Pierre De Rop | c40d93f | 2015-05-04 20:25:57 +0000 | [diff] [blame^] | 346 | // In the following switch block, we sometimes only recalculate state changes |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 347 | // if the dependency is fully started. If the dependency is not started, |
| 348 | // it means it is actually starting (the service tracker is executing the open method). |
Pierre De Rop | c40d93f | 2015-05-04 20:25:57 +0000 | [diff] [blame^] | 349 | // And in this case, depending on the state, we don't recalculate state changes now. We'll do it |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 350 | // once all currently available services are found, and then after, |
| 351 | // we'll recalculate state change (see the startDependencies method). |
| 352 | // |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 353 | // All this is done for two reasons: |
Pierre De Rop | c40d93f | 2015-05-04 20:25:57 +0000 | [diff] [blame^] | 354 | // 1- optimization: it is preferable to recalculate state changes once we know about all currently |
| 355 | // available dependency services (after the tracker has returned from its open method). |
| 356 | // 2- This also allows to determine the list of currently available dependency services from within |
| 357 | // the component start method callback (this will be extremely useful when porting the Felix SCR |
| 358 | // on top of DM4). |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 359 | |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 360 | switch (m_state) { |
| 361 | case WAITING_FOR_REQUIRED: |
| 362 | if (dc.isStarted() && dc.isRequired()) { |
| 363 | // if dependency is starting, we'll handle change after the tracker has returned (see startDependencies method). |
| 364 | handleChange(); |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 365 | } |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 366 | break; |
| 367 | case INSTANTIATED_AND_WAITING_FOR_REQUIRED: |
| 368 | if (!dc.isInstanceBound()) { |
| 369 | if (dc.isRequired()) { |
| 370 | dc.invokeCallback(EventType.ADDED, e); |
| 371 | } |
| 372 | updateInstance(dc, e, false, true); |
| 373 | } else { |
| 374 | if (dc.isStarted() && dc.isRequired()) { |
| 375 | // if dependency is starting, we'll handle change after the tracker has returned (see startDependencies method). |
| 376 | handleChange(); |
| 377 | } |
| 378 | } |
| 379 | break; |
| 380 | case TRACKING_OPTIONAL: |
| 381 | dc.invokeCallback(EventType.ADDED, e); |
| 382 | updateInstance(dc, e, false, true); |
| 383 | break; |
| 384 | default: |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 385 | } |
| 386 | } |
| 387 | |
| 388 | private void handleChanged(final DependencyContext dc, final Event e) { |
| 389 | if (! m_isStarted) { |
| 390 | return; |
| 391 | } |
| 392 | Set<Event> dependencyEvents = m_dependencyEvents.get(dc); |
| 393 | dependencyEvents.remove(e); |
| 394 | dependencyEvents.add(e); |
| 395 | |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 396 | switch (m_state) { |
| 397 | case TRACKING_OPTIONAL: |
| 398 | dc.invokeCallback(EventType.CHANGED, e); |
| 399 | updateInstance(dc, e, true, false); |
| 400 | break; |
| 401 | |
| 402 | case INSTANTIATED_AND_WAITING_FOR_REQUIRED: |
| 403 | if (!dc.isInstanceBound()) { |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 404 | dc.invokeCallback(EventType.CHANGED, e); |
| 405 | updateInstance(dc, e, true, false); |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 406 | } |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 407 | break; |
| 408 | default: |
| 409 | // noop |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 410 | } |
| 411 | } |
| 412 | |
| 413 | private void handleRemoved(DependencyContext dc, Event e) { |
| 414 | if (! m_isStarted) { |
| 415 | return; |
| 416 | } |
| 417 | // Check if the dependency is still available. |
| 418 | Set<Event> dependencyEvents = m_dependencyEvents.get(dc); |
| 419 | int size = dependencyEvents.size(); |
| 420 | if (dependencyEvents.contains(e)) { |
| 421 | size--; // the dependency is currently registered and is about to be removed. |
| 422 | } |
| 423 | dc.setAvailable(size > 0); |
| 424 | |
| 425 | // If the dependency is now unavailable, we have to recalculate state change. This will result in invoking the |
| 426 | // "removed" callback with the removed dependency (which we have not yet removed from our dependency events list.). |
| 427 | // But we don't recalculate the state if the dependency is not started (if not started, it means that it is currently starting, |
| 428 | // and the tracker is detecting a removed service). |
| 429 | if (size == 0 && dc.isStarted()) { |
| 430 | handleChange(); |
| 431 | } |
| 432 | |
| 433 | // Now, really remove the dependency event. |
| 434 | dependencyEvents.remove(e); |
| 435 | |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 436 | // Depending on the state, we possible have to invoke the callbacks and update the component instance. |
| 437 | switch (m_state) { |
| 438 | case INSTANTIATED_AND_WAITING_FOR_REQUIRED: |
| 439 | if (!dc.isInstanceBound()) { |
| 440 | if (dc.isRequired()) { |
| 441 | dc.invokeCallback(EventType.REMOVED, e); |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 442 | } |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 443 | updateInstance(dc, e, false, false); |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 444 | } |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 445 | break; |
| 446 | case TRACKING_OPTIONAL: |
| 447 | dc.invokeCallback(EventType.REMOVED, e); |
| 448 | updateInstance(dc, e, false, false); |
| 449 | break; |
| 450 | default: |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 451 | } |
| 452 | } |
| 453 | |
| 454 | private void handleSwapped(DependencyContext dc, Event oldEvent, Event newEvent) { |
| 455 | if (! m_isStarted) { |
| 456 | return; |
| 457 | } |
| 458 | Set<Event> dependencyEvents = m_dependencyEvents.get(dc); |
| 459 | dependencyEvents.remove(oldEvent); |
| 460 | dependencyEvents.add(newEvent); |
| 461 | |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 462 | // Depending on the state, we possible have to invoke the callbacks and update the component instance. |
| 463 | switch (m_state) { |
| 464 | case WAITING_FOR_REQUIRED: |
| 465 | // No need to swap, we don't have yet injected anything |
| 466 | break; |
| 467 | case INSTANTIATED_AND_WAITING_FOR_REQUIRED: |
| 468 | // Only swap *non* instance-bound dependencies |
| 469 | if (!dc.isInstanceBound()) { |
| 470 | if (dc.isRequired()) { |
| 471 | dc.invokeCallback(EventType.SWAPPED, oldEvent, newEvent); |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 472 | } |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 473 | } |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 474 | break; |
| 475 | case TRACKING_OPTIONAL: |
| 476 | dc.invokeCallback(EventType.SWAPPED, oldEvent, newEvent); |
| 477 | break; |
| 478 | default: |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 479 | } |
| 480 | } |
| 481 | |
| 482 | private void handleChange() { |
| 483 | m_logger.debug("handleChanged"); |
| 484 | try { |
| 485 | ComponentState oldState; |
| 486 | ComponentState newState; |
| 487 | do { |
| 488 | oldState = m_state; |
| 489 | newState = calculateNewState(oldState); |
| 490 | m_logger.debug("%s -> %s", oldState, newState); |
| 491 | m_state = newState; |
| 492 | } while (performTransition(oldState, newState)); |
| 493 | } finally { |
| 494 | m_logger.debug("end handling change."); |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | /** Based on the current state, calculate the new state. */ |
| 499 | private ComponentState calculateNewState(ComponentState currentState) { |
| 500 | if (currentState == INACTIVE) { |
| 501 | if (m_isStarted) { |
| 502 | return WAITING_FOR_REQUIRED; |
| 503 | } |
| 504 | } |
| 505 | if (currentState == WAITING_FOR_REQUIRED) { |
| 506 | if (!m_isStarted) { |
| 507 | return INACTIVE; |
| 508 | } |
| 509 | if (allRequiredAvailable()) { |
| 510 | return INSTANTIATED_AND_WAITING_FOR_REQUIRED; |
| 511 | } |
| 512 | } |
| 513 | if (currentState == INSTANTIATED_AND_WAITING_FOR_REQUIRED) { |
| 514 | if (m_isStarted && allRequiredAvailable()) { |
| 515 | if (allInstanceBoundAvailable()) { |
| 516 | return TRACKING_OPTIONAL; |
| 517 | } |
| 518 | return currentState; |
| 519 | } |
| 520 | return WAITING_FOR_REQUIRED; |
| 521 | } |
| 522 | if (currentState == TRACKING_OPTIONAL) { |
| 523 | if (m_isStarted && allRequiredAvailable() && allInstanceBoundAvailable()) { |
| 524 | return currentState; |
| 525 | } |
| 526 | return INSTANTIATED_AND_WAITING_FOR_REQUIRED; |
| 527 | } |
| 528 | return currentState; |
| 529 | } |
| 530 | |
| 531 | /** Perform all the actions associated with state transitions. Returns true if a transition was performed. */ |
| 532 | private boolean performTransition(ComponentState oldState, ComponentState newState) { |
| 533 | // System.out.println("transition from " + oldState + " to " + newState); |
| 534 | if (oldState == ComponentState.INACTIVE && newState == ComponentState.WAITING_FOR_REQUIRED) { |
| 535 | startDependencies(m_dependencies); |
| 536 | notifyListeners(newState); |
| 537 | return true; |
| 538 | } |
| 539 | if (oldState == ComponentState.WAITING_FOR_REQUIRED && newState == ComponentState.INSTANTIATED_AND_WAITING_FOR_REQUIRED) { |
| 540 | instantiateComponent(); |
| 541 | invokeAutoConfigDependencies(); |
| 542 | invokeAddRequiredDependencies(); |
| 543 | ComponentState stateBeforeCallingInit = m_state; |
| 544 | invoke(m_callbackInit); |
| 545 | if (stateBeforeCallingInit == m_state) { |
| 546 | notifyListeners(newState); // init did not change current state, we can notify about this new state |
| 547 | } |
| 548 | return true; |
| 549 | } |
| 550 | if (oldState == ComponentState.INSTANTIATED_AND_WAITING_FOR_REQUIRED && newState == ComponentState.TRACKING_OPTIONAL) { |
| 551 | invokeAutoConfigInstanceBoundDependencies(); |
| 552 | invokeAddRequiredInstanceBoundDependencies(); |
| 553 | invoke(m_callbackStart); |
| 554 | invokeAddOptionalDependencies(); |
| 555 | registerService(); |
| 556 | notifyListeners(newState); |
| 557 | return true; |
| 558 | } |
| 559 | if (oldState == ComponentState.TRACKING_OPTIONAL && newState == ComponentState.INSTANTIATED_AND_WAITING_FOR_REQUIRED) { |
| 560 | unregisterService(); |
| 561 | invokeRemoveOptionalDependencies(); |
| 562 | invoke(m_callbackStop); |
| 563 | invokeRemoveInstanceBoundDependencies(); |
| 564 | notifyListeners(newState); |
| 565 | return true; |
| 566 | } |
| 567 | if (oldState == ComponentState.INSTANTIATED_AND_WAITING_FOR_REQUIRED && newState == ComponentState.WAITING_FOR_REQUIRED) { |
| 568 | invoke(m_callbackDestroy); |
| 569 | invokeRemoveRequiredDependencies(); |
| 570 | notifyListeners(newState); |
| 571 | if (! someDependenciesNeedInstance()) { |
| 572 | destroyComponent(); |
| 573 | } |
| 574 | return true; |
| 575 | } |
| 576 | if (oldState == ComponentState.WAITING_FOR_REQUIRED && newState == ComponentState.INACTIVE) { |
| 577 | stopDependencies(); |
| 578 | destroyComponent(); |
| 579 | notifyListeners(newState); |
| 580 | return true; |
| 581 | } |
| 582 | return false; |
| 583 | } |
| 584 | |
| 585 | private boolean allRequiredAvailable() { |
| 586 | boolean available = true; |
| 587 | for (DependencyContext d : m_dependencies) { |
| 588 | if (d.isRequired() && !d.isInstanceBound()) { |
| 589 | if (!d.isAvailable()) { |
| 590 | available = false; |
| 591 | break; |
| 592 | } |
| 593 | } |
| 594 | } |
| 595 | return available; |
| 596 | } |
| 597 | |
| 598 | private boolean allInstanceBoundAvailable() { |
| 599 | boolean available = true; |
| 600 | for (DependencyContext d : m_dependencies) { |
| 601 | if (d.isRequired() && d.isInstanceBound()) { |
| 602 | if (!d.isAvailable()) { |
| 603 | available = false; |
| 604 | break; |
| 605 | } |
| 606 | } |
| 607 | } |
| 608 | return available; |
| 609 | } |
| 610 | |
| 611 | private boolean someDependenciesNeedInstance() { |
| 612 | for (DependencyContext d : m_dependencies) { |
| 613 | if (d.needsInstance()) { |
| 614 | return true; |
| 615 | } |
| 616 | } |
| 617 | return false; |
| 618 | } |
| 619 | |
| 620 | /** |
| 621 | * Updates the component instance(s). |
| 622 | * @param dc the dependency context for the updating dependency service |
| 623 | * @param event the event holding the updating service (service + properties) |
| 624 | * @param update true if dependency service properties are updating, false if not. If false, it means |
| 625 | * that a dependency service is being added or removed. (see the "add" flag). |
| 626 | * @param add true if the dependency service has been added, false if it has been removed. This flag is |
| 627 | * ignored if the "update" flag is true (because the dependency properties are just being updated). |
| 628 | */ |
| 629 | private void updateInstance(DependencyContext dc, Event event, boolean update, boolean add) { |
| 630 | if (dc.isAutoConfig()) { |
| 631 | updateImplementation(dc.getAutoConfigType(), dc, dc.getAutoConfigName(), event, update, add); |
| 632 | } |
| 633 | if (dc.isPropagated() && m_registration != null) { |
| 634 | m_registration.setProperties(calculateServiceProperties()); |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | private void startDependencies(List<DependencyContext> dependencies) { |
| 639 | // Start first optional dependencies first. |
| 640 | m_logger.debug("startDependencies."); |
| 641 | List<DependencyContext> requiredDeps = new ArrayList<>(); |
| 642 | for (DependencyContext d : dependencies) { |
| 643 | if (d.isRequired()) { |
| 644 | requiredDeps.add(d); |
| 645 | continue; |
| 646 | } |
| 647 | if (d.needsInstance()) { |
| 648 | instantiateComponent(); |
| 649 | } |
| 650 | d.start(); |
| 651 | } |
| 652 | // now, start required dependencies. |
| 653 | for (DependencyContext d : requiredDeps) { |
| 654 | if (d.needsInstance()) { |
| 655 | instantiateComponent(); |
| 656 | } |
| 657 | d.start(); |
| 658 | } |
| 659 | // The started dependencies has probably called our handleAdded method: we now have to run our state machine. |
| 660 | handleChange(); |
| 661 | } |
| 662 | |
| 663 | private void stopDependencies() { |
| 664 | for (DependencyContext d : m_dependencies) { |
| 665 | d.stop(); |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | private void registerService() { |
| 670 | if (m_context != null && m_serviceName != null) { |
| 671 | ServiceRegistrationImpl wrapper = new ServiceRegistrationImpl(); |
| 672 | m_registration = wrapper; |
| 673 | autoConfigureImplementation(ServiceRegistration.class, m_registration); |
| 674 | |
| 675 | // service name can either be a string or an array of strings |
| 676 | ServiceRegistration registration; |
| 677 | |
| 678 | // determine service properties |
| 679 | Dictionary<?,?> properties = calculateServiceProperties(); |
| 680 | |
| 681 | // register the service |
| 682 | try { |
| 683 | if (m_serviceName instanceof String) { |
| 684 | registration = m_context.registerService((String) m_serviceName, m_componentInstance, properties); |
| 685 | } |
| 686 | else { |
| 687 | registration = m_context.registerService((String[]) m_serviceName, m_componentInstance, properties); |
| 688 | } |
| 689 | wrapper.setServiceRegistration(registration); |
| 690 | } |
| 691 | catch (IllegalArgumentException iae) { |
| 692 | m_logger.log(Logger.LOG_ERROR, "Could not register service " + m_componentInstance, iae); |
| 693 | // set the registration to an illegal state object, which will make all invocations on this |
| 694 | // wrapper fail with an ISE (which also occurs when the SR becomes invalid) |
| 695 | wrapper.setIllegalState(); |
| 696 | } |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | private void unregisterService() { |
| 701 | if (m_serviceName != null && m_registration != null) { |
| 702 | try { |
| 703 | if (m_bundle != null && m_bundle.getState() == Bundle.ACTIVE) { |
| 704 | m_registration.unregister(); |
| 705 | } |
| 706 | } catch (IllegalStateException e) { /* Should we really log this ? */} |
| 707 | autoConfigureImplementation(ServiceRegistration.class, NULL_REGISTRATION); |
| 708 | m_registration = null; |
| 709 | } |
| 710 | } |
| 711 | |
| 712 | private Dictionary<Object, Object> calculateServiceProperties() { |
| 713 | Dictionary<Object, Object> properties = new Hashtable<>(); |
| 714 | for (int i = 0; i < m_dependencies.size(); i++) { |
| 715 | DependencyContext d = (DependencyContext) m_dependencies.get(i); |
| 716 | if (d.isPropagated() && d.isAvailable()) { |
| 717 | Dictionary<Object, Object> dict = d.getProperties(); |
| 718 | addTo(properties, dict); |
| 719 | } |
| 720 | } |
| 721 | // our service properties must not be overriden by propagated dependency properties, so we add our service |
| 722 | // properties after having added propagated dependency properties. |
| 723 | addTo(properties, m_serviceProperties); |
| 724 | if (properties.size() == 0) { |
| 725 | properties = null; |
| 726 | } |
| 727 | return properties; |
| 728 | } |
| 729 | |
| 730 | private void addTo(Dictionary<Object, Object> properties, Dictionary<Object, Object> additional) { |
| 731 | if (properties == null) { |
| 732 | throw new IllegalArgumentException("Dictionary to add to cannot be null."); |
| 733 | } |
| 734 | if (additional != null) { |
| 735 | Enumeration<Object> e = additional.keys(); |
| 736 | while (e.hasMoreElements()) { |
| 737 | Object key = e.nextElement(); |
| 738 | properties.put(key, additional.get(key)); |
| 739 | } |
| 740 | } |
| 741 | } |
| 742 | |
Pierre De Rop | d2012be | 2015-04-28 12:17:36 +0000 | [diff] [blame] | 743 | void instantiateComponent() { |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 744 | m_logger.debug("instantiating component."); |
| 745 | |
| 746 | // TODO add more complex factory instantiations of one or more components in a composition here |
| 747 | if (m_componentInstance == null) { |
| 748 | if (m_componentDefinition instanceof Class) { |
| 749 | try { |
| 750 | m_componentInstance = createInstance((Class<?>) m_componentDefinition); |
| 751 | } |
| 752 | catch (Exception e) { |
| 753 | m_logger.log(Logger.LOG_ERROR, "Could not instantiate class " + m_componentDefinition, e); |
| 754 | } |
| 755 | } |
| 756 | else { |
| 757 | if (m_instanceFactoryCreateMethod != null) { |
| 758 | Object factory = null; |
| 759 | if (m_instanceFactory != null) { |
| 760 | if (m_instanceFactory instanceof Class) { |
| 761 | try { |
| 762 | factory = createInstance((Class<?>) m_instanceFactory); |
| 763 | } |
| 764 | catch (Exception e) { |
| 765 | m_logger.log(Logger.LOG_ERROR, "Could not create factory instance of class " + m_instanceFactory + ".", e); |
| 766 | } |
| 767 | } |
| 768 | else { |
| 769 | factory = m_instanceFactory; |
| 770 | } |
| 771 | } |
| 772 | else { |
| 773 | // TODO review if we want to try to default to something if not specified |
| 774 | // for now the JavaDoc of setFactory(method) reflects the fact that we need |
| 775 | // to review it |
| 776 | } |
| 777 | if (factory == null) { |
| 778 | m_logger.log(Logger.LOG_ERROR, "Factory cannot be null."); |
| 779 | } |
| 780 | else { |
| 781 | try { |
Pierre De Rop | c40d93f | 2015-05-04 20:25:57 +0000 | [diff] [blame^] | 782 | m_componentInstance = InvocationUtil.invokeMethod(factory, |
| 783 | factory.getClass(), m_instanceFactoryCreateMethod, |
| 784 | new Class[][] {{}, {Component.class}}, new Object[][] {{}, {this}}, false); |
Pierre De Rop | 3a00a21 | 2015-03-01 09:27:46 +0000 | [diff] [blame] | 785 | } |
| 786 | catch (Exception e) { |
| 787 | m_logger.log(Logger.LOG_ERROR, "Could not create service instance using factory " + factory + " method " + m_instanceFactoryCreateMethod + ".", e); |
| 788 | } |
| 789 | } |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | if (m_componentInstance == null) { |
| 794 | m_componentInstance = m_componentDefinition; |
| 795 | } |
| 796 | |
| 797 | // configure the bundle context |
| 798 | autoConfigureImplementation(BundleContext.class, m_context); |
| 799 | autoConfigureImplementation(ServiceRegistration.class, NULL_REGISTRATION); |
| 800 | autoConfigureImplementation(DependencyManager.class, m_manager); |
| 801 | autoConfigureImplementation(Component.class, this); |
| 802 | } |
| 803 | } |
| 804 | |
| 805 | private void destroyComponent() { |
| 806 | m_componentInstance = null; |
| 807 | } |
| 808 | |
| 809 | private void invokeAddRequiredDependencies() { |
| 810 | for (DependencyContext d : m_dependencies) { |
| 811 | if (d.isRequired() && !d.isInstanceBound()) { |
| 812 | for (Event e : m_dependencyEvents.get(d)) { |
| 813 | d.invokeCallback(EventType.ADDED, e); |
| 814 | } |
| 815 | } |
| 816 | } |
| 817 | } |
| 818 | |
| 819 | private void invokeAutoConfigDependencies() { |
| 820 | for (DependencyContext d : m_dependencies) { |
| 821 | if (d.isAutoConfig() && !d.isInstanceBound()) { |
| 822 | configureImplementation(d.getAutoConfigType(), d, d.getAutoConfigName()); |
| 823 | } |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | private void invokeAutoConfigInstanceBoundDependencies() { |
| 828 | for (DependencyContext d : m_dependencies) { |
| 829 | if (d.isAutoConfig() && d.isInstanceBound()) { |
| 830 | configureImplementation(d.getAutoConfigType(), d, d.getAutoConfigName()); |
| 831 | } |
| 832 | } |
| 833 | } |
| 834 | |
| 835 | private void invokeAddRequiredInstanceBoundDependencies() { |
| 836 | for (DependencyContext d : m_dependencies) { |
| 837 | if (d.isRequired() && d.isInstanceBound()) { |
| 838 | for (Event e : m_dependencyEvents.get(d)) { |
| 839 | d.invokeCallback(EventType.ADDED, e); |
| 840 | } |
| 841 | } |
| 842 | } |
| 843 | } |
| 844 | |
| 845 | private void invokeAddOptionalDependencies() { |
| 846 | for (DependencyContext d : m_dependencies) { |
| 847 | if (! d.isRequired()) { |
| 848 | for (Event e : m_dependencyEvents.get(d)) { |
| 849 | d.invokeCallback(EventType.ADDED, e); |
| 850 | } |
| 851 | } |
| 852 | } |
| 853 | } |
| 854 | |
| 855 | private void invokeRemoveRequiredDependencies() { |
| 856 | for (DependencyContext d : m_dependencies) { |
| 857 | if (!d.isInstanceBound() && d.isRequired()) { |
| 858 | for (Event e : m_dependencyEvents.get(d)) { |
| 859 | d.invokeCallback(EventType.REMOVED, e); |
| 860 | } |
| 861 | } |
| 862 | } |
| 863 | } |
| 864 | |
| 865 | private void invokeRemoveOptionalDependencies() { |
| 866 | for (DependencyContext d : m_dependencies) { |
| 867 | if (! d.isRequired()) { |
| 868 | for (Event e : m_dependencyEvents.get(d)) { |
| 869 | d.invokeCallback(EventType.REMOVED, e); |
| 870 | } |
| 871 | } |
| 872 | } |
| 873 | } |
| 874 | |
| 875 | private void invokeRemoveInstanceBoundDependencies() { |
| 876 | for (DependencyContext d : m_dependencies) { |
| 877 | if (d.isInstanceBound()) { |
| 878 | for (Event e : m_dependencyEvents.get(d)) { |
| 879 | d.invokeCallback(EventType.REMOVED, e); |
| 880 | } |
| 881 | } |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | private void invoke(String name) { |
| 886 | if (name != null) { |
| 887 | // if a callback instance was specified, look for the method there, if not, |
| 888 | // ask the service for its composition instances |
| 889 | Object[] instances = m_callbackInstance != null ? new Object[] { m_callbackInstance } : getCompositionInstances(); |
| 890 | |
| 891 | long t1 = System.nanoTime(); |
| 892 | try { |
| 893 | invokeCallbackMethod(instances, name, |
| 894 | new Class[][] {{ Component.class }, {}}, |
| 895 | new Object[][] {{ this }, {}}, |
| 896 | false); |
| 897 | } finally { |
| 898 | long t2 = System.nanoTime(); |
| 899 | m_stopwatch.put(name, t2 - t1); |
| 900 | } |
| 901 | } |
| 902 | } |
| 903 | |
| 904 | @SuppressWarnings("unchecked") |
| 905 | public <T> T getInstance() { |
| 906 | Object[] instances = getCompositionInstances(); |
| 907 | return instances.length == 0 ? null : (T) instances[0]; |
| 908 | } |
| 909 | |
| 910 | public Object[] getInstances() { |
| 911 | return getCompositionInstances(); |
| 912 | } |
| 913 | |
| 914 | public void invokeCallbackMethod(Object[] instances, String methodName, Class<?>[][] signatures, Object[][] parameters) { |
| 915 | invokeCallbackMethod(instances, methodName, signatures, parameters, true); |
| 916 | } |
| 917 | |
| 918 | public void invokeCallbackMethod(Object[] instances, String methodName, Class<?>[][] signatures, |
| 919 | Object[][] parameters, boolean logIfNotFound) { |
| 920 | boolean callbackFound = false; |
| 921 | for (int i = 0; i < instances.length; i++) { |
| 922 | try { |
| 923 | InvocationUtil.invokeCallbackMethod(instances[i], methodName, signatures, parameters); |
| 924 | callbackFound |= true; |
| 925 | } |
| 926 | catch (NoSuchMethodException e) { |
| 927 | // if the method does not exist, ignore it |
| 928 | } |
| 929 | catch (InvocationTargetException e) { |
| 930 | // the method itself threw an exception, log that |
| 931 | m_logger.log(Logger.LOG_ERROR, "Invocation of '" + methodName + "' failed.", e.getCause()); |
| 932 | } |
| 933 | catch (Throwable e) { |
| 934 | m_logger.log(Logger.LOG_ERROR, "Could not invoke '" + methodName + "'.", e); |
| 935 | } |
| 936 | } |
| 937 | |
| 938 | // If the callback is not found, we don't log if the method is on an AbstractDecorator. |
| 939 | // (Aspect or Adapter are not interested in user dependency callbacks) |
| 940 | if (logIfNotFound && ! callbackFound && ! (getInstance() instanceof AbstractDecorator)) { |
| 941 | if (m_logger == null) { |
| 942 | System.out.println("Callback \"" + methodName + "\" not found on componnent instances " |
| 943 | + Arrays.toString(getInstances())); |
| 944 | } else { |
| 945 | m_logger.log(LogService.LOG_ERROR, "Callback \"" + methodName + "\" callback not found on componnent instances " |
| 946 | + Arrays.toString(getInstances())); |
| 947 | } |
| 948 | |
| 949 | } |
| 950 | } |
| 951 | |
| 952 | private Object createInstance(Class<?> clazz) throws SecurityException, NoSuchMethodException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException { |
| 953 | Constructor<?> constructor = clazz.getConstructor(VOID); |
| 954 | constructor.setAccessible(true); |
| 955 | return constructor.newInstance(); |
| 956 | } |
| 957 | |
| 958 | private void notifyListeners(ComponentState state) { |
| 959 | for (ComponentStateListener l : m_listeners) { |
| 960 | l.changed(this, state); |
| 961 | } |
| 962 | } |
| 963 | |
| 964 | @Override |
| 965 | public boolean isAvailable() { |
| 966 | return m_state == TRACKING_OPTIONAL; |
| 967 | } |
| 968 | |
| 969 | @Override |
| 970 | public boolean isActive() { |
| 971 | return m_active.get(); |
| 972 | } |
| 973 | |
| 974 | @Override |
| 975 | public Component add(final ComponentStateListener l) { |
| 976 | m_listeners.add(l); |
| 977 | return this; |
| 978 | } |
| 979 | |
| 980 | @Override |
| 981 | public Component remove(ComponentStateListener l) { |
| 982 | m_listeners.remove(l); |
| 983 | return this; |
| 984 | } |
| 985 | |
| 986 | @SuppressWarnings("unchecked") |
| 987 | @Override |
| 988 | public List<DependencyContext> getDependencies() { |
| 989 | return (List<DependencyContext>) m_dependencies.clone(); |
| 990 | } |
| 991 | |
| 992 | @Override |
| 993 | public Component setImplementation(Object implementation) { |
| 994 | m_componentDefinition = implementation; |
| 995 | return this; |
| 996 | } |
| 997 | |
| 998 | private void autoConfigureImplementation(Class<?> clazz, Object instance) { |
| 999 | if (((Boolean) m_autoConfig.get(clazz)).booleanValue()) { |
| 1000 | configureImplementation(clazz, instance, (String) m_autoConfigInstance.get(clazz)); |
| 1001 | } |
| 1002 | } |
| 1003 | |
| 1004 | /** |
| 1005 | * Configure a field in the service implementation. The service implementation |
| 1006 | * is searched for fields that have the same type as the class that was specified |
| 1007 | * and for each of these fields, the specified instance is filled in. |
| 1008 | * |
| 1009 | * @param clazz the class to search for |
| 1010 | * @param instance the object to fill in the implementation class(es) field |
| 1011 | * @param instanceName the name of the instance to fill in, or <code>null</code> if not used |
| 1012 | */ |
| 1013 | private void configureImplementation(Class<?> clazz, Object instance, String fieldName) { |
| 1014 | Object[] targets = getInstances(); |
| 1015 | if (! FieldUtil.injectField(targets, fieldName, clazz, instance, m_logger) && fieldName != null) { |
| 1016 | // If the target is an abstract decorator (i.e: an adapter, or an aspect), we must not log warnings |
| 1017 | // if field has not been injected. |
| 1018 | if (! (getInstance() instanceof AbstractDecorator)) { |
| 1019 | m_logger.log(Logger.LOG_ERROR, "Could not inject " + instance + " to field \"" + fieldName |
| 1020 | + "\" at any of the following component instances: " + Arrays.toString(targets)); |
| 1021 | } |
| 1022 | } |
| 1023 | } |
| 1024 | |
| 1025 | private void configureImplementation(Class<?> clazz, DependencyContext dc, String fieldName) { |
| 1026 | Object[] targets = getInstances(); |
| 1027 | if (! FieldUtil.injectDependencyField(targets, fieldName, clazz, dc, m_logger) && fieldName != null) { |
| 1028 | // If the target is an abstract decorator (i.e: an adapter, or an aspect), we must not log warnings |
| 1029 | // if field has not been injected. |
| 1030 | if (! (getInstance() instanceof AbstractDecorator)) { |
| 1031 | m_logger.log(Logger.LOG_ERROR, "Could not inject dependency " + clazz.getName() + " to field \"" |
| 1032 | + fieldName + "\" at any of the following component instances: " + Arrays.toString(targets)); |
| 1033 | } |
| 1034 | } |
| 1035 | } |
| 1036 | |
| 1037 | /** |
| 1038 | * Update the component instances. |
| 1039 | * |
| 1040 | * @param clazz the class of the dependency service to inject in the component instances |
| 1041 | * @param dc the dependency context for the updating dependency service |
| 1042 | * @param fieldName the component instances fieldname to fill in with the updated dependency service |
| 1043 | * @param event the event holding the updating service (service + properties) |
| 1044 | * @param update true if dependency service properties are updating, false if not. If false, it means |
| 1045 | * that a dependency service is being added or removed. (see the "add" flag). |
| 1046 | * @param add true if the dependency service has been added, false if it has been removed. This flag is |
| 1047 | * ignored if the "update" flag is true (because the dependency properties are just being updated). |
| 1048 | */ |
| 1049 | private void updateImplementation(Class<?> clazz, DependencyContext dc, String fieldName, Event event, boolean update, |
| 1050 | boolean add) |
| 1051 | { |
| 1052 | Object[] targets = getInstances(); |
| 1053 | FieldUtil.updateDependencyField(targets, fieldName, update, add, clazz, event, dc, m_logger); |
| 1054 | } |
| 1055 | |
| 1056 | @Override |
| 1057 | public ServiceRegistration getServiceRegistration() { |
| 1058 | return m_registration; |
| 1059 | } |
| 1060 | |
| 1061 | @SuppressWarnings("unchecked") |
| 1062 | @Override |
| 1063 | public <K,V> Dictionary<K, V> getServiceProperties() { |
| 1064 | if (m_serviceProperties != null) { |
| 1065 | // Applied patch from FELIX-4304 |
| 1066 | Hashtable<Object, Object> serviceProperties = new Hashtable<>(); |
| 1067 | addTo(serviceProperties, m_serviceProperties); |
| 1068 | return (Dictionary<K, V>) serviceProperties; |
| 1069 | } |
| 1070 | return null; |
| 1071 | } |
| 1072 | |
| 1073 | @Override |
| 1074 | @SuppressWarnings("unchecked") |
| 1075 | public Component setServiceProperties(final Dictionary<?, ?> serviceProperties) { |
| 1076 | getExecutor().execute(new Runnable() { |
| 1077 | @Override |
| 1078 | public void run() { |
| 1079 | Dictionary<Object, Object> properties = null; |
| 1080 | m_serviceProperties = (Dictionary<Object, Object>) serviceProperties; |
| 1081 | if ((m_registration != null) && (m_serviceName != null)) { |
| 1082 | properties = calculateServiceProperties(); |
| 1083 | m_registration.setProperties(properties); |
| 1084 | } |
| 1085 | } |
| 1086 | }); |
| 1087 | return this; |
| 1088 | } |
| 1089 | |
| 1090 | public Component setCallbacks(String init, String start, String stop, String destroy) { |
| 1091 | ensureNotActive(); |
| 1092 | m_callbackInit = init; |
| 1093 | m_callbackStart = start; |
| 1094 | m_callbackStop = stop; |
| 1095 | m_callbackDestroy = destroy; |
| 1096 | return this; |
| 1097 | } |
| 1098 | |
| 1099 | public Component setCallbacks(Object instance, String init, String start, String stop, String destroy) { |
| 1100 | ensureNotActive(); |
| 1101 | m_callbackInstance = instance; |
| 1102 | m_callbackInit = init; |
| 1103 | m_callbackStart = start; |
| 1104 | m_callbackStop = stop; |
| 1105 | m_callbackDestroy = destroy; |
| 1106 | return this; |
| 1107 | } |
| 1108 | |
| 1109 | @Override |
| 1110 | public Component setFactory(Object factory, String createMethod) { |
| 1111 | ensureNotActive(); |
| 1112 | m_instanceFactory = factory; |
| 1113 | m_instanceFactoryCreateMethod = createMethod; |
| 1114 | return this; |
| 1115 | } |
| 1116 | |
| 1117 | @Override |
| 1118 | public Component setFactory(String createMethod) { |
| 1119 | return setFactory(null, createMethod); |
| 1120 | } |
| 1121 | |
| 1122 | @Override |
| 1123 | public Component setComposition(Object instance, String getMethod) { |
| 1124 | ensureNotActive(); |
| 1125 | m_compositionManager = instance; |
| 1126 | m_compositionManagerGetMethod = getMethod; |
| 1127 | return this; |
| 1128 | } |
| 1129 | |
| 1130 | @Override |
| 1131 | public Component setComposition(String getMethod) { |
| 1132 | return setComposition(null, getMethod); |
| 1133 | } |
| 1134 | |
| 1135 | private Object[] getCompositionInstances() { |
| 1136 | Object[] instances = null; |
| 1137 | if (m_compositionManagerGetMethod != null) { |
| 1138 | if (m_compositionManager != null) { |
| 1139 | m_compositionManagerInstance = m_compositionManager; |
| 1140 | } |
| 1141 | else { |
| 1142 | m_compositionManagerInstance = m_componentInstance; |
| 1143 | } |
| 1144 | if (m_compositionManagerInstance != null) { |
| 1145 | try { |
| 1146 | instances = (Object[]) InvocationUtil.invokeMethod(m_compositionManagerInstance, m_compositionManagerInstance.getClass(), m_compositionManagerGetMethod, new Class[][] {{}}, new Object[][] {{}}, false); |
| 1147 | } |
| 1148 | catch (Exception e) { |
| 1149 | m_logger.log(Logger.LOG_ERROR, "Could not obtain instances from the composition manager.", e); |
| 1150 | instances = m_componentInstance == null ? new Object[] {} : new Object[] { m_componentInstance }; |
| 1151 | } |
| 1152 | } |
| 1153 | } |
| 1154 | else { |
| 1155 | instances = m_componentInstance == null ? new Object[] {} : new Object[] { m_componentInstance }; |
| 1156 | } |
| 1157 | return instances; |
| 1158 | } |
| 1159 | |
| 1160 | @Override |
| 1161 | public DependencyManager getDependencyManager() { |
| 1162 | return m_manager; |
| 1163 | } |
| 1164 | |
| 1165 | public ComponentDependencyDeclaration[] getComponentDependencies() { |
| 1166 | List<DependencyContext> deps = getDependencies(); |
| 1167 | if (deps != null) { |
| 1168 | ComponentDependencyDeclaration[] result = new ComponentDependencyDeclaration[deps.size()]; |
| 1169 | for (int i = 0; i < result.length; i++) { |
| 1170 | DependencyContext dep = (DependencyContext) deps.get(i); |
| 1171 | if (dep instanceof ComponentDependencyDeclaration) { |
| 1172 | result[i] = (ComponentDependencyDeclaration) dep; |
| 1173 | } |
| 1174 | else { |
| 1175 | result[i] = new SCDImpl(dep.toString(), (dep.isAvailable() ? 1 : 0) + (dep.isRequired() ? 2 : 0), dep.getClass().getName()); |
| 1176 | } |
| 1177 | } |
| 1178 | return result; |
| 1179 | } |
| 1180 | return null; |
| 1181 | } |
| 1182 | |
| 1183 | public String getName() { |
| 1184 | StringBuffer sb = new StringBuffer(); |
| 1185 | Object serviceName = m_serviceName; |
| 1186 | if (serviceName instanceof String[]) { |
| 1187 | String[] names = (String[]) serviceName; |
| 1188 | for (int i = 0; i < names.length; i++) { |
| 1189 | if (i > 0) { |
| 1190 | sb.append(", "); |
| 1191 | } |
| 1192 | sb.append(names[i]); |
| 1193 | } |
| 1194 | appendProperties(sb); |
| 1195 | } else if (serviceName instanceof String) { |
| 1196 | sb.append(serviceName.toString()); |
| 1197 | appendProperties(sb); |
| 1198 | } else { |
| 1199 | Object implementation = m_componentDefinition; |
| 1200 | if (implementation != null) { |
| 1201 | if (implementation instanceof Class) { |
| 1202 | sb.append(((Class<?>) implementation).getName()); |
| 1203 | } else { |
| 1204 | // If the implementation instance does not override "toString", just display |
| 1205 | // the class name, else display the component using its toString method |
| 1206 | try { |
| 1207 | Method m = implementation.getClass().getMethod("toString", new Class[0]); |
| 1208 | if (m.getDeclaringClass().equals(Object.class)) { |
| 1209 | sb.append(implementation.getClass().getName()); |
| 1210 | } else { |
| 1211 | sb.append(implementation.toString()); |
| 1212 | } |
| 1213 | } catch (java.lang.NoSuchMethodException e) { |
| 1214 | // Just display the class name |
| 1215 | sb.append(implementation.getClass().getName()); |
| 1216 | } |
| 1217 | } |
| 1218 | } else { |
| 1219 | sb.append(super.toString()); |
| 1220 | } |
| 1221 | } |
| 1222 | return sb.toString(); |
| 1223 | } |
| 1224 | |
| 1225 | private void appendProperties(StringBuffer result) { |
| 1226 | Dictionary<Object, Object> properties = calculateServiceProperties(); |
| 1227 | if (properties != null) { |
| 1228 | result.append("("); |
| 1229 | Enumeration<?> enumeration = properties.keys(); |
| 1230 | while (enumeration.hasMoreElements()) { |
| 1231 | Object key = enumeration.nextElement(); |
| 1232 | result.append(key.toString()); |
| 1233 | result.append('='); |
| 1234 | Object value = properties.get(key); |
| 1235 | if (value instanceof String[]) { |
| 1236 | String[] values = (String[]) value; |
| 1237 | result.append('{'); |
| 1238 | for (int i = 0; i < values.length; i++) { |
| 1239 | if (i > 0) { |
| 1240 | result.append(','); |
| 1241 | } |
| 1242 | result.append(values[i].toString()); |
| 1243 | } |
| 1244 | result.append('}'); |
| 1245 | } |
| 1246 | else { |
| 1247 | result.append(value.toString()); |
| 1248 | } |
| 1249 | if (enumeration.hasMoreElements()) { |
| 1250 | result.append(','); |
| 1251 | } |
| 1252 | } |
| 1253 | result.append(")"); |
| 1254 | } |
| 1255 | } |
| 1256 | |
| 1257 | @Override |
| 1258 | public BundleContext getBundleContext() { |
| 1259 | return m_context; |
| 1260 | } |
| 1261 | |
| 1262 | @Override |
| 1263 | public Bundle getBundle() { |
| 1264 | return m_bundle; |
| 1265 | } |
| 1266 | |
| 1267 | public long getId() { |
| 1268 | return m_id; |
| 1269 | } |
| 1270 | |
| 1271 | public String getClassName() { |
| 1272 | Object serviceInstance = m_componentInstance; |
| 1273 | if (serviceInstance != null) { |
| 1274 | return serviceInstance.getClass().getName(); |
| 1275 | } |
| 1276 | |
| 1277 | Object implementation = m_componentDefinition; |
| 1278 | if (implementation != null) { |
| 1279 | if (implementation instanceof Class) { |
| 1280 | return ((Class<?>) implementation).getName(); |
| 1281 | } |
| 1282 | return implementation.getClass().getName(); |
| 1283 | } |
| 1284 | |
| 1285 | Object instanceFactory = m_instanceFactory; |
| 1286 | if (instanceFactory != null) { |
| 1287 | return instanceFactory.getClass().getName(); |
| 1288 | } else { |
| 1289 | // unexpected. |
| 1290 | return ComponentImpl.class.getName(); |
| 1291 | } |
| 1292 | } |
| 1293 | |
| 1294 | public String[] getServices() { |
| 1295 | if (m_serviceName instanceof String[]) { |
| 1296 | return (String[]) m_serviceName; |
| 1297 | } else if (m_serviceName instanceof String) { |
| 1298 | return new String[] { (String) m_serviceName }; |
| 1299 | } else { |
| 1300 | return null; |
| 1301 | } |
| 1302 | } |
| 1303 | |
| 1304 | public int getState() { |
| 1305 | return (isAvailable() ? ComponentDeclaration.STATE_REGISTERED : ComponentDeclaration.STATE_UNREGISTERED); |
| 1306 | } |
| 1307 | |
| 1308 | public void ensureNotActive() { |
| 1309 | if (m_active.get()) { |
| 1310 | throw new IllegalStateException("Can't modify an already started component."); |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | public ComponentDeclaration getComponentDeclaration() { |
| 1315 | return this; |
| 1316 | } |
| 1317 | |
| 1318 | @Override |
| 1319 | public String toString() { |
| 1320 | if (m_logger.getDebugKey() != null) { |
| 1321 | return m_logger.getDebugKey(); |
| 1322 | } |
| 1323 | return getClassName(); |
| 1324 | } |
| 1325 | |
| 1326 | @Override |
| 1327 | public void setThreadPool(Executor threadPool) { |
| 1328 | ensureNotActive(); |
| 1329 | m_executor = new DispatchExecutor(threadPool, m_logger); |
| 1330 | } |
| 1331 | |
| 1332 | @Override |
| 1333 | public Logger getLogger() { |
| 1334 | return m_logger; |
| 1335 | } |
| 1336 | |
| 1337 | @Override |
| 1338 | public Map<String, Long> getCallbacksTime() { |
| 1339 | return m_stopwatch; |
| 1340 | } |
| 1341 | |
| 1342 | private Executor getExecutor() { |
| 1343 | return m_executor; |
| 1344 | } |
| 1345 | } |