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18 package org.apache.logging.log4j.core.config.plugins.util;
19
20 import java.io.IOException;
21 import java.net.URI;
22 import java.net.URL;
23 import java.text.DecimalFormat;
24 import java.util.ArrayList;
25 import java.util.Collections;
26 import java.util.Enumeration;
27 import java.util.HashMap;
28 import java.util.List;
29 import java.util.Map;
30 import java.util.concurrent.ConcurrentHashMap;
31 import java.util.concurrent.ConcurrentMap;
32 import java.util.concurrent.atomic.AtomicReference;
33
34 import org.apache.logging.log4j.Logger;
35 import org.apache.logging.log4j.core.config.plugins.Plugin;
36 import org.apache.logging.log4j.core.config.plugins.PluginAliases;
37 import org.apache.logging.log4j.core.config.plugins.processor.PluginCache;
38 import org.apache.logging.log4j.core.config.plugins.processor.PluginEntry;
39 import org.apache.logging.log4j.core.config.plugins.processor.PluginProcessor;
40 import org.apache.logging.log4j.core.util.Loader;
41 import org.apache.logging.log4j.status.StatusLogger;
42 import org.apache.logging.log4j.util.Strings;
43
44
45
46
47 public class PluginRegistry {
48
49 private static final Logger LOGGER = StatusLogger.getLogger();
50
51 private static volatile PluginRegistry INSTANCE;
52 private static final Object INSTANCE_LOCK = new Object();
53
54
55
56
57 private final AtomicReference<Map<String, List<PluginType<?>>>> pluginsByCategoryRef =
58 new AtomicReference<>();
59
60
61
62
63 private final ConcurrentMap<Long, Map<String, List<PluginType<?>>>> pluginsByCategoryByBundleId =
64 new ConcurrentHashMap<>();
65
66
67
68
69 private final ConcurrentMap<String, Map<String, List<PluginType<?>>>> pluginsByCategoryByPackage =
70 new ConcurrentHashMap<>();
71
72 private PluginRegistry() {
73 }
74
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79
80
81 public static PluginRegistry getInstance() {
82 PluginRegistry result = INSTANCE;
83 if (result == null) {
84 synchronized (INSTANCE_LOCK) {
85 result = INSTANCE;
86 if (result == null) {
87 INSTANCE = result = new PluginRegistry();
88 }
89 }
90 }
91 return result;
92 }
93
94
95
96
97 public void clear() {
98 pluginsByCategoryRef.set(null);
99 pluginsByCategoryByPackage.clear();
100 pluginsByCategoryByBundleId.clear();
101 }
102
103
104
105
106 public Map<Long, Map<String, List<PluginType<?>>>> getPluginsByCategoryByBundleId() {
107 return pluginsByCategoryByBundleId;
108 }
109
110
111
112
113 public Map<String, List<PluginType<?>>> loadFromMainClassLoader() {
114 final Map<String, List<PluginType<?>>> existing = pluginsByCategoryRef.get();
115 if (existing != null) {
116
117 return existing;
118 }
119 final Map<String, List<PluginType<?>>> newPluginsByCategory = decodeCacheFiles(Loader.getClassLoader());
120
121
122
123
124 if (pluginsByCategoryRef.compareAndSet(null, newPluginsByCategory)) {
125 return newPluginsByCategory;
126 }
127 return pluginsByCategoryRef.get();
128 }
129
130
131
132
133 public void clearBundlePlugins(final long bundleId) {
134 pluginsByCategoryByBundleId.remove(bundleId);
135 }
136
137
138
139
140 public Map<String, List<PluginType<?>>> loadFromBundle(final long bundleId, final ClassLoader loader) {
141 Map<String, List<PluginType<?>>> existing = pluginsByCategoryByBundleId.get(bundleId);
142 if (existing != null) {
143
144 return existing;
145 }
146 final Map<String, List<PluginType<?>>> newPluginsByCategory = decodeCacheFiles(loader);
147
148
149
150
151 existing = pluginsByCategoryByBundleId.putIfAbsent(bundleId, newPluginsByCategory);
152 if (existing != null) {
153 return existing;
154 }
155 return newPluginsByCategory;
156 }
157
158 private Map<String, List<PluginType<?>>> decodeCacheFiles(final ClassLoader loader) {
159 final long startTime = System.nanoTime();
160 final PluginCache cache = new PluginCache();
161 try {
162 final Enumeration<URL> resources = loader.getResources(PluginProcessor.PLUGIN_CACHE_FILE);
163 if (resources == null) {
164 LOGGER.info("Plugin preloads not available from class loader {}", loader);
165 } else {
166 cache.loadCacheFiles(resources);
167 }
168 } catch (final IOException ioe) {
169 LOGGER.warn("Unable to preload plugins", ioe);
170 }
171 final Map<String, List<PluginType<?>>> newPluginsByCategory = new HashMap<>();
172 int pluginCount = 0;
173 for (final Map.Entry<String, Map<String, PluginEntry>> outer : cache.getAllCategories().entrySet()) {
174 final String categoryLowerCase = outer.getKey();
175 final List<PluginType<?>> types = new ArrayList<>(outer.getValue().size());
176 newPluginsByCategory.put(categoryLowerCase, types);
177 for (final Map.Entry<String, PluginEntry> inner : outer.getValue().entrySet()) {
178 final PluginEntry entry = inner.getValue();
179 final String className = entry.getClassName();
180 try {
181 final Class<?> clazz = loader.loadClass(className);
182 @SuppressWarnings({"unchecked","rawtypes"})
183 final PluginType<?> type = new PluginType<>(entry, clazz, entry.getName());
184 types.add(type);
185 ++pluginCount;
186 } catch (final ClassNotFoundException e) {
187 LOGGER.info("Plugin [{}] could not be loaded due to missing classes.", className, e);
188 } catch (final VerifyError e) {
189 LOGGER.info("Plugin [{}] could not be loaded due to verification error.", className, e);
190 }
191 }
192 }
193
194 final long endTime = System.nanoTime();
195 final DecimalFormat numFormat = new DecimalFormat("#0.000000");
196 final double seconds = (endTime - startTime) * 1e-9;
197 LOGGER.debug("Took {} seconds to load {} plugins from {}",
198 numFormat.format(seconds), pluginCount, loader);
199 return newPluginsByCategory;
200 }
201
202
203
204
205 public Map<String, List<PluginType<?>>> loadFromPackage(final String pkg) {
206 if (Strings.isBlank(pkg)) {
207
208 return Collections.emptyMap();
209 }
210 Map<String, List<PluginType<?>>> existing = pluginsByCategoryByPackage.get(pkg);
211 if (existing != null) {
212
213 return existing;
214 }
215
216 final long startTime = System.nanoTime();
217 final ResolverUtil resolver = new ResolverUtil();
218 final ClassLoader classLoader = Loader.getClassLoader();
219 if (classLoader != null) {
220 resolver.setClassLoader(classLoader);
221 }
222 resolver.findInPackage(new PluginTest(), pkg);
223
224 final Map<String, List<PluginType<?>>> newPluginsByCategory = new HashMap<>();
225 for (final Class<?> clazz : resolver.getClasses()) {
226 final Plugin plugin = clazz.getAnnotation(Plugin.class);
227 final String categoryLowerCase = plugin.category().toLowerCase();
228 List<PluginType<?>> list = newPluginsByCategory.get(categoryLowerCase);
229 if (list == null) {
230 newPluginsByCategory.put(categoryLowerCase, list = new ArrayList<>());
231 }
232 final PluginEntry mainEntry = new PluginEntry();
233 final String mainElementName = plugin.elementType().equals(
234 Plugin.EMPTY) ? plugin.name() : plugin.elementType();
235 mainEntry.setKey(plugin.name().toLowerCase());
236 mainEntry.setName(plugin.name());
237 mainEntry.setCategory(plugin.category());
238 mainEntry.setClassName(clazz.getName());
239 mainEntry.setPrintable(plugin.printObject());
240 mainEntry.setDefer(plugin.deferChildren());
241 final PluginType<?> mainType = new PluginType<>(mainEntry, clazz, mainElementName);
242 list.add(mainType);
243 final PluginAliases pluginAliases = clazz.getAnnotation(PluginAliases.class);
244 if (pluginAliases != null) {
245 for (final String alias : pluginAliases.value()) {
246 final PluginEntry aliasEntry = new PluginEntry();
247 final String aliasElementName = plugin.elementType().equals(
248 Plugin.EMPTY) ? alias.trim() : plugin.elementType();
249 aliasEntry.setKey(alias.trim().toLowerCase());
250 aliasEntry.setName(plugin.name());
251 aliasEntry.setCategory(plugin.category());
252 aliasEntry.setClassName(clazz.getName());
253 aliasEntry.setPrintable(plugin.printObject());
254 aliasEntry.setDefer(plugin.deferChildren());
255 final PluginType<?> aliasType = new PluginType<>(aliasEntry, clazz, aliasElementName);
256 list.add(aliasType);
257 }
258 }
259 }
260
261 final long endTime = System.nanoTime();
262 final DecimalFormat numFormat = new DecimalFormat("#0.000000");
263 final double seconds = (endTime - startTime) * 1e-9;
264 LOGGER.debug("Took {} seconds to load {} plugins from package {}",
265 numFormat.format(seconds), resolver.getClasses().size(), pkg);
266
267
268
269
270 existing = pluginsByCategoryByPackage.putIfAbsent(pkg, newPluginsByCategory);
271 if (existing != null) {
272 return existing;
273 }
274 return newPluginsByCategory;
275 }
276
277
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280
281
282
283 public static class PluginTest implements ResolverUtil.Test {
284 @Override
285 public boolean matches(final Class<?> type) {
286 return type != null && type.isAnnotationPresent(Plugin.class);
287 }
288
289 @Override
290 public String toString() {
291 return "annotated with @" + Plugin.class.getSimpleName();
292 }
293
294 @Override
295 public boolean matches(final URI resource) {
296 throw new UnsupportedOperationException();
297 }
298
299 @Override
300 public boolean doesMatchClass() {
301 return true;
302 }
303
304 @Override
305 public boolean doesMatchResource() {
306 return false;
307 }
308 }
309 }