JaxRsBundleTracker.java
/*
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* wcm.io
* %%
* Copyright (C) 2015 wcm.io
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
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package io.wcm.caravan.jaxrs.publisher.impl;
import java.util.Dictionary;
import java.util.Hashtable;
import org.apache.commons.lang3.StringUtils;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleEvent;
import org.osgi.service.component.ComponentConstants;
import org.osgi.service.component.ComponentContext;
import org.osgi.service.component.ComponentFactory;
import org.osgi.service.component.ComponentInstance;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Deactivate;
import org.osgi.service.component.annotations.Reference;
import org.osgi.util.tracker.BundleTracker;
import org.osgi.util.tracker.BundleTrackerCustomizer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.wcm.caravan.jaxrs.publisher.ApplicationPath;
/**
* Bundle tracker that listens for all bundles added to the OSGi systems, and searches for JAX-RS components.
* If any is found and an application path is defined a jersey instance dedicated to this bundle is instantiated.
*/
@Component(immediate = true)
public class JaxRsBundleTracker implements BundleTrackerCustomizer<ComponentInstance> {
private static final Logger log = LoggerFactory.getLogger(JaxRsBundleTracker.class);
private BundleTracker<ComponentInstance> bundleTracker;
@Reference(target = "(" + ComponentConstants.COMPONENT_FACTORY + "=" + ServletContainerBridge.SERVLETCONTAINER_BRIDGE_FACTORY + ")")
private ComponentFactory servletContainerBridgeFactory;
@Activate
void activate(ComponentContext componentContext) {
BundleContext bundleContext = componentContext.getBundleContext();
this.bundleTracker = new BundleTracker<ComponentInstance>(bundleContext, Bundle.ACTIVE, this);
this.bundleTracker.open();
}
@Deactivate
void deactivate() {
this.bundleTracker.close();
}
@Override
public ComponentInstance addingBundle(Bundle bundle, BundleEvent event) {
String applicationPath = ApplicationPath.get(bundle);
if (StringUtils.isNotBlank(applicationPath)) {
if (log.isInfoEnabled()) {
log.info("Mount JAX-RS application {} to {}", bundle.getSymbolicName(), applicationPath);
}
// register JAX-RS application as servlet on HTTP whiteboard
Dictionary<String, Object> serviceConfig = new Hashtable<>();
serviceConfig.put("alias", applicationPath);
serviceConfig.put(ServletContainerBridge.PROPERTY_BUNDLE_ID, bundle.getBundleId());
return servletContainerBridgeFactory.newInstance(serviceConfig);
}
return null;
}
@Override
public void modifiedBundle(Bundle bundle, BundleEvent event, ComponentInstance componentInstance) {
// nothing to do
}
@Override
public void removedBundle(Bundle bundle, BundleEvent event, ComponentInstance componentInstance) {
if (componentInstance == null) {
return;
}
if (log.isInfoEnabled()) {
String applicationPath = ApplicationPath.get(bundle);
log.info("Unmount JAX-RS application {} from {}", bundle.getSymbolicName(), applicationPath);
}
componentInstance.dispose();
}
}