/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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 org.kuali.rice.ksb.messaging.serviceexporters;

 import java.net.URI;

 import java.net.URL;

 import java.util.concurrent.ConcurrentHashMap;

 import java.util.concurrent.ConcurrentMap;

 import javax.xml.namespace.QName;

 import org.apache.commons.lang.StringUtils;

 import org.apache.cxf.Bus;

 import org.apache.cxf.endpoint.ServerRegistry;

 import org.kuali.rice.core.api.config.property.Config;

 import org.kuali.rice.core.api.config.property.ConfigContext;

 import org.kuali.rice.ksb.api.bus.ServiceDefinition;

 public class ServiceExportManagerImpl implements ServiceExportManager {

         private final ConcurrentMap<QName, ExportedServiceHolder> exportedServices;

         private final ServiceNameFinder serviceNameFinder;

         private Bus cxfBus;

         private ServerRegistry cxfServerRegistry;

         public ServiceExportManagerImpl() {

                 this.exportedServices = new ConcurrentHashMap<QName, ExportedServiceHolder>();

                 this.serviceNameFinder = new ServiceNameFinder();

         }

         @Override

         public QName getServiceName(String endpointUrl) {

                 return getServiceNameFinder().lookup(endpointUrl);

         }

         protected ServiceNameFinder getServiceNameFinder() {

                 return serviceNameFinder;

         }

         @Override

         public Object getService(QName serviceName) {

                 ExportedServiceHolder holder = exportedServices.get(serviceName);

                 if (holder == null) {

                         return null;

                 }

                 return holder.getExportedService();

         }

         @Override

         public void exportService(ServiceDefinition serviceDefinition) {

                 if (serviceDefinition == null) {

                         throw new IllegalArgumentException("serviceDefinition was null");

                 }

                 ServiceExporter serviceExporter = ServiceExporterFactory.getServiceExporter(serviceDefinition, cxfBus, cxfServerRegistry);

                 Object exportedService = serviceExporter.exportService(serviceDefinition);

                 exportedServices.put(serviceDefinition.getServiceName(), new ExportedServiceHolder(exportedService, serviceDefinition));

                 getServiceNameFinder().register(serviceDefinition);

         }

         @Override

         public void removeService(QName serviceName) {

                 ExportedServiceHolder exportedServiceHolder = exportedServices.remove(serviceName);

                 getServiceNameFinder().remove(exportedServiceHolder.getServiceDefinition().getEndpointUrl());

         }

         protected ConcurrentMap<QName, ExportedServiceHolder> getExportedServices() {

                 return exportedServices;

         }

         public void setCxfBus(Bus cxfBus) {

                 this.cxfBus = cxfBus;

         }

         public void setCxfServerRegistry(ServerRegistry cxfServerRegistry) {

                 this.cxfServerRegistry = cxfServerRegistry;

         }

         protected static class ExportedServiceHolder {

                 private final Object exportedService;

                 private final ServiceDefinition serviceDefinition;

                 ExportedServiceHolder(Object exportedService, ServiceDefinition serviceDefinition) {

                         this.exportedService = exportedService;

                         this.serviceDefinition = serviceDefinition;

                 }

                 public Object getExportedService() {

                         return exportedService;

                 }

                 public ServiceDefinition getServiceDefinition() {

                         return serviceDefinition;

                 }

         }

         /**

          * Looks up service QNameS based on URL StringS.  API is Map-like, but non-service specific portions of the

          * URL are trimmed prior to accessing its internal Map.

          * 

          * @author Kuali Rice Team (rice.collab@kuali.org)

          *

          */

         protected static class ServiceNameFinder {

                 /**

                  * A service path to service QName map

                  */

                 private ConcurrentMap<String, QName> servicePathToQName = new ConcurrentHashMap<String, QName>();

                 /**

                  * This method trims the endpoint url base ({@link Config#getEndPointUrl()}) base off of the full service URL, e.g.

                  * "http://kuali.edu/kr-dev/remoting/SomeService" -> "SomeService".  It makes an effort to do so even if the host

                  * and ip don't match what is in {@link Config#getEndPointUrl()} by stripping host/port info.

                  * 

                  * If the service URL contains the configured subpath for RESTful service, additional trimming is done to

                  * isolate the service name from the rest of the url.

                  * 

                  * @param url

                  * @return the service specific suffix.  If fullServiceUrl doesn't contain the endpoint url base,

                  * fullServiceUrl is returned unmodified.  

                  */

                 private String trimServiceUrlBase(String url) {

                         String trimmedUrl = StringUtils.removeStart(url, ConfigContext.getCurrentContextConfig().getEndPointUrl());

                         if (trimmedUrl.length() == url.length()) { // it didn't contain the endpoint url base.

                                 // Perhaps the incoming url has a different host (or the ip) or a different port.

                                 // Trim off the host & port, then trim off the common base.

                                 URI serviceUri = URI.create(url);

                                 URI endpointUrlBase = URI.create(ConfigContext.getCurrentContextConfig().getEndPointUrl());

                                 String reqPath = serviceUri.getPath();

                                 String basePath = endpointUrlBase.getPath();

                                 trimmedUrl = StringUtils.removeStart(reqPath, basePath);

                         }

                         return trimmedUrl;

                 }

                 /**

                  * adds a mapping from the service specific portion of the service URL to the service name.

                  * 

                  * @param serviceUrl

                  * @param serviceName

                  */

                 public void register(ServiceDefinition serviceDefinition) {

                         String serviceUrlBase = trimServiceUrlBase(serviceDefinition.getEndpointUrl().toExternalForm());

                         if (serviceUrlBase.endsWith("/")) {

                                 serviceUrlBase = StringUtils.chop(serviceUrlBase);

                         }

                         servicePathToQName.put(serviceUrlBase, serviceDefinition.getServiceName());

                 }

                 /**

                  * removes the mapping (if one exists) for the service specific portion of this url.

                  * 

                  * @param serviceUrl

                  */

                 public void remove(URL endpointUrl) {

                         servicePathToQName.remove(trimServiceUrlBase(endpointUrl.toExternalForm()));

                 }

                 /**

                  * gets the QName for the service

                  * 

                  * @param serviceUrl

                  * @return

                  */

                 public QName lookup(String serviceUrl) {

                         String serviceUrlBase = trimServiceUrlBase(serviceUrl);

                         // First, make sure we don't have any query params

                         if (serviceUrlBase.length() > 0 && serviceUrlBase.lastIndexOf('?') != -1) {

                                 serviceUrlBase = serviceUrlBase.substring(0, serviceUrlBase.lastIndexOf('?'));

                         }

                         QName qname = null;

                         // Now, iterate backwards through the url, stripping off pieces until you match -- this should work for rest too

                         while (qname == null) {

                                 qname = servicePathToQName.get(serviceUrlBase);

                                 int lastSeparatorIndex = serviceUrlBase.lastIndexOf('/');

                                 if (lastSeparatorIndex == -1)

                                         break;

                                 serviceUrlBase = serviceUrlBase.substring(0, lastSeparatorIndex);

                         }

                         return qname;

                 }

         }

 }