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/*
* Copyright 2000-2016 Vaadin Ltd.
*
* 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 limitations under
* the License.
*/
package com.vaadin.osgi.servlet;
import java.util.Collections;
import java.util.Hashtable;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.servlet.Servlet;
import javax.servlet.annotation.WebServlet;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.component.annotations.ReferenceCardinality;
import org.osgi.service.component.annotations.ReferencePolicy;
import org.osgi.service.http.whiteboard.HttpWhiteboardConstants;
import org.osgi.service.log.LogService;
import com.vaadin.osgi.resources.OsgiVaadinResources;
import com.vaadin.osgi.resources.OsgiVaadinResources.ResourceBundleInactiveException;
import com.vaadin.osgi.resources.VaadinResourceService;
import com.vaadin.server.Constants;
import com.vaadin.server.VaadinServlet;
/**
* This component tracks {@link VaadinServlet} registrations, configures them
* with the appropriate path to the Vaadin static resources and registers a
* {@link Servlet} using the HttpWhiteboard specification.
*
* @author Vaadin Ltd.
*
* @since 8.1
*/
@Component
public class VaadinServletRegistration {
private final Map<ServiceReference<VaadinServlet>, ServiceRegistration<Servlet>> registeredServlets = Collections
.synchronizedMap(new LinkedHashMap<>());
private static final String MISSING_ANNOTATION_MESSAGE_FORMAT = "The property '%s' must be set in a '%s' without the '%s' annotation!";
private static final String URL_PATTERNS_NOT_SET_MESSAGE_FORMAT = "The property '%s' must be set when the 'urlPatterns' attribute is not set!";
private static final String SERVLET_PATTERN = HttpWhiteboardConstants.HTTP_WHITEBOARD_SERVLET_PATTERN;
private static final String VAADIN_RESOURCES_PARAM = HttpWhiteboardConstants.HTTP_WHITEBOARD_SERVLET_INIT_PARAM_PREFIX
+ Constants.PARAMETER_VAADIN_RESOURCES;
private LogService logService;
@Reference(cardinality = ReferenceCardinality.MULTIPLE, service = VaadinServlet.class, policy = ReferencePolicy.DYNAMIC)
void bindVaadinServlet(VaadinServlet servlet, ServiceReference<VaadinServlet> reference)
throws ResourceBundleInactiveException {
log(LogService.LOG_WARNING, "VaadinServlet Registration");
Hashtable<String, Object> properties = getProperties(reference);
WebServlet annotation = servlet.getClass()
.getAnnotation(WebServlet.class);
if (!validateSettings(annotation, properties)) {
return;
}
properties.put(VAADIN_RESOURCES_PARAM, getResourcePath());
if (annotation != null) {
properties.put(
HttpWhiteboardConstants.HTTP_WHITEBOARD_SERVLET_ASYNC_SUPPORTED,
Boolean.toString(annotation.asyncSupported()));
}
// We register the Http Whiteboard servlet using the context of
// the bundle which registered the Vaadin Servlet, not our own
BundleContext bundleContext = reference.getBundle().getBundleContext();
ServiceRegistration<Servlet> servletRegistration = bundleContext
.registerService(Servlet.class, servlet, properties);
registeredServlets.put(reference, servletRegistration);
}
private boolean validateSettings(WebServlet annotation,
Hashtable<String, Object> properties) {
if (!properties.containsKey(SERVLET_PATTERN)) {
if (annotation == null) {
log(LogService.LOG_ERROR,
String.format(MISSING_ANNOTATION_MESSAGE_FORMAT,
SERVLET_PATTERN,
VaadinServlet.class.getSimpleName(),
WebServlet.class.getName()));
return false;
} else if (annotation.urlPatterns().length == 0) {
log(LogService.LOG_ERROR, String.format(
URL_PATTERNS_NOT_SET_MESSAGE_FORMAT, SERVLET_PATTERN));
return false;
}
}
return true;
}
private String getResourcePath() throws ResourceBundleInactiveException {
VaadinResourceService service = OsgiVaadinResources.getService();
return String.format("/%s", service.getResourcePathPrefix());
}
private void log(int level, String message) {
if (logService != null) {
logService.log(level, message);
}
}
void unbindVaadinServlet(ServiceReference<VaadinServlet> reference) {
ServiceRegistration<?> servletRegistration = registeredServlets
.remove(reference);
if (servletRegistration != null) {
try {
servletRegistration.unregister();
} catch (IllegalStateException ise) {
// This service may have already been unregistered
// automatically by the OSGi framework if the
// application bundle is being stopped. This is
// obviously not a problem for us.
}
}
}
@Reference(cardinality = ReferenceCardinality.OPTIONAL)
void setLogService(LogService logService) {
this.logService = logService;
}
void unsetLogService(LogService logService) {
this.logService = null;
}
private Hashtable<String, Object> getProperties(
ServiceReference<VaadinServlet> reference) {
Hashtable<String, Object> properties = new Hashtable<>();
for (String key : reference.getPropertyKeys()) {
properties.put(key, reference.getProperty(key));
}
return properties;
}
}
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