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17 package org.apache.logging.log4j.util;
18
19 import java.net.URL;
20 import java.security.Permission;
21 import java.util.List;
22
23 import org.apache.logging.log4j.Logger;
24 import org.apache.logging.log4j.spi.LoggerContextFactory;
25 import org.apache.logging.log4j.status.StatusLogger;
26 import org.osgi.framework.AdaptPermission;
27 import org.osgi.framework.AdminPermission;
28 import org.osgi.framework.Bundle;
29 import org.osgi.framework.BundleActivator;
30 import org.osgi.framework.BundleContext;
31 import org.osgi.framework.BundleEvent;
32 import org.osgi.framework.SynchronousBundleListener;
33 import org.osgi.framework.wiring.BundleWire;
34 import org.osgi.framework.wiring.BundleWiring;
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41
42 public class Activator implements BundleActivator, SynchronousBundleListener {
43
44 private static final SecurityManager SECURITY_MANAGER = System.getSecurityManager();
45
46 private static final Logger LOGGER = StatusLogger.getLogger();
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49
50 private boolean lockingProviderUtil;
51
52 private static void checkPermission(final Permission permission) {
53 if (SECURITY_MANAGER != null) {
54 SECURITY_MANAGER.checkPermission(permission);
55 }
56 }
57
58 private void loadProvider(final Bundle bundle) {
59 if (bundle.getState() == Bundle.UNINSTALLED) {
60 return;
61 }
62 try {
63 checkPermission(new AdminPermission(bundle, AdminPermission.RESOURCE));
64 checkPermission(new AdaptPermission(BundleWiring.class.getName(), bundle, AdaptPermission.ADAPT));
65 loadProvider(bundle.adapt(BundleWiring.class));
66 } catch (final SecurityException e) {
67 LOGGER.debug("Cannot access bundle [{}] contents. Ignoring.", bundle.getSymbolicName(), e);
68 } catch (final Exception e) {
69 LOGGER.warn("Problem checking bundle {} for Log4j 2 provider.", bundle.getSymbolicName(), e);
70 }
71 }
72
73 private void loadProvider(final BundleWiring provider) {
74 final List<URL> urls = provider.findEntries("META-INF", "log4j-provider.properties", 0);
75 for (final URL url : urls) {
76 ProviderUtil.loadProvider(url, provider.getClassLoader());
77 }
78 }
79
80 @Override
81 public void start(final BundleContext context) throws Exception {
82 ProviderUtil.STARTUP_LOCK.lock();
83 lockingProviderUtil = true;
84 final BundleWiring self = context.getBundle().adapt(BundleWiring.class);
85 final List<BundleWire> required = self.getRequiredWires(LoggerContextFactory.class.getName());
86 for (final BundleWire wire : required) {
87 loadProvider(wire.getProviderWiring());
88 }
89 context.addBundleListener(this);
90 final Bundle[] bundles = context.getBundles();
91 for (final Bundle bundle : bundles) {
92 loadProvider(bundle);
93 }
94 unlockIfReady();
95 }
96
97 private void unlockIfReady() {
98 if (lockingProviderUtil && !ProviderUtil.PROVIDERS.isEmpty()) {
99 ProviderUtil.STARTUP_LOCK.unlock();
100 lockingProviderUtil = false;
101 }
102 }
103
104 @Override
105 public void stop(final BundleContext context) throws Exception {
106 context.removeBundleListener(this);
107 unlockIfReady();
108 }
109
110 @Override
111 public void bundleChanged(final BundleEvent event) {
112 switch (event.getType()) {
113 case BundleEvent.STARTED:
114 loadProvider(event.getBundle());
115 unlockIfReady();
116 break;
117
118 default:
119 break;
120 }
121 }
122
123 }