/*
* Copyright (c) 2005-2008, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. licenses this file to you 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 org.wso2.carbon.discovery.mediation.ext;
import org.wso2.carbon.mediation.registry.RegistryExtension;
import org.wso2.carbon.discovery.messages.TargetService;
import org.apache.axiom.om.OMNode;
import org.apache.synapse.endpoints.AddressEndpoint;
import org.apache.synapse.endpoints.EndpointDefinition;
import org.apache.synapse.config.xml.endpoints.EndpointSerializer;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.Properties;
import java.net.URI;
/**
* Discovery registry extensions can find service endpoints given a key of the
* form wsdd://<Service UUID>/<Protocol>. The protocol part is optional so when
* not provided the first endpoint returned by the discovery API will be used as
* the service endpoint. These extension implementations can be engaged into the
* Carbon mediation registry adapter through the Synapse configuration. The returned
* OMNode instances can be used to initialize Synapse address endpoints.
*/
public abstract class DiscoveryRegistryExtension implements RegistryExtension {
public static final String WSDD_PREFIX = "wsdd://";
public static final String DISCOVERY_PROXY_URL = "discoveryProxy";
protected Properties properties;
protected Log log;
public void init(Properties properties) {
log = LogFactory.getLog(this.getClass());
this.properties = properties;
if (log.isDebugEnabled()) {
log.debug("Registry extension initialized");
}
}
public OMNode lookup(String key) {
String protocol = null;
if (!key.startsWith(WSDD_PREFIX)) {
return null;
}
key = key.substring(WSDD_PREFIX.length());
int index = key.indexOf('/');
if (index != -1) {
protocol = key.substring(index + 1);
key = key.substring(0, index);
}
if ("".equals(key)) {
return null;
}
try {
return findEndpoint(key, protocol);
} catch (Exception e) {
log.error("Error while retreiving discovered endpoint", e);
}
return null;
}
protected OMNode createAddressEndpoint(URI uri) {
AddressEndpoint endpoint = new AddressEndpoint();
EndpointDefinition def = new EndpointDefinition();
def.setAddress(uri.toString());
endpoint.setDefinition(def);
return EndpointSerializer.getElementFromEndpoint(endpoint);
}
protected OMNode getEndpointFromService(TargetService service, String protocol) {
if (service != null && service.getXAddresses() != null &&
service.getXAddresses().length > 0) {
URI[] addresses = service.getXAddresses();
if (addresses.length > 1 && protocol != null && !"".equals(protocol)) {
for (URI address : addresses) {
if (address.getScheme().equals(protocol)) {
return createAddressEndpoint(address);
}
}
} else {
return createAddressEndpoint(addresses[0]);
}
}
return null;
}
public abstract OMNode findEndpoint(String uuid, String protocol) throws Exception;
}