package org.apache.logging.log4j.core.osgi;
import java.util.Hashtable;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.config.plugins.util.PluginRegistry;
import org.apache.logging.log4j.core.impl.Log4jProvider;
import org.apache.logging.log4j.core.util.Constants;
import org.apache.logging.log4j.spi.Provider;
import org.apache.logging.log4j.status.StatusLogger;
import org.apache.logging.log4j.util.PropertiesUtil;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleEvent;
import org.osgi.framework.ServiceRegistration;
import org.osgi.framework.SynchronousBundleListener;
import org.osgi.framework.wiring.BundleWiring;
public final class Activator implements BundleActivator, SynchronousBundleListener {
private static final Logger LOGGER = StatusLogger.getLogger();
private final AtomicReference<BundleContext> contextRef = new AtomicReference<>();
ServiceRegistration provideRegistration = null;
@Override
public void start(final BundleContext context) throws Exception {
final Provider provider = new Log4jProvider();
final Hashtable<String, String> props = new Hashtable<>();
props.put("APIVersion", "2.60");
provideRegistration = context.registerService(Provider.class.getName(), provider, props);
if (PropertiesUtil.getProperties().getStringProperty(Constants.LOG4J_CONTEXT_SELECTOR) == null) {
System.setProperty(Constants.LOG4J_CONTEXT_SELECTOR, BundleContextSelector.class.getName());
}
if (this.contextRef.compareAndSet(null, context)) {
context.addBundleListener(this);
scanInstalledBundlesForPlugins(context);
}
}
private static void scanInstalledBundlesForPlugins(final BundleContext context) {
final Bundle[] bundles = context.getBundles();
for (final Bundle bundle : bundles) {
scanBundleForPlugins(bundle);
}
}
private static void scanBundleForPlugins(final Bundle bundle) {
final long bundleId = bundle.getBundleId();
if (bundle.getState() == Bundle.ACTIVE && bundleId != 0) {
LOGGER.trace("Scanning bundle [{}, id=%d] for plugins.", bundle.getSymbolicName(), bundleId);
PluginRegistry.getInstance().loadFromBundle(bundleId,
bundle.adapt(BundleWiring.class).getClassLoader());
}
}
private static void stopBundlePlugins(final Bundle bundle) {
LOGGER.trace("Stopping bundle [{}] plugins.", bundle.getSymbolicName());
PluginRegistry.getInstance().clearBundlePlugins(bundle.getBundleId());
}
@Override
public void stop(final BundleContext context) throws Exception {
provideRegistration.unregister();
this.contextRef.compareAndSet(context, null);
LogManager.shutdown();
}
@Override
public void bundleChanged(final BundleEvent event) {
switch (event.getType()) {
case BundleEvent.STARTED:
scanBundleForPlugins(event.getBundle());
break;
case BundleEvent.STOPPING:
stopBundlePlugins(event.getBundle());
break;
default:
break;
}
}
}