/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.cxf.endpoint;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.xml.namespace.QName;
import org.apache.cxf.Bus;
import org.apache.cxf.ws.addressing.EndpointReferenceType;
/**
* This implementation class is responsible for mediating
* access to registered EndpointResolvers, which themselves map
* between abstract and concrete endpoint references, and/or
* facilitate renewal of stale references.
* <p>
* An underlying mechanism in the style of the OGSA WS-Naming
* specification is assumed, where an EPR maybe be fully abstract,
* or concrete but with sufficient information embedded to enable
* its renewal if necessary.
*/
public class EndpointResolverRegistryImpl implements EndpointResolverRegistry {
private Bus bus;
private List<EndpointResolver> resolvers;
/**
* Initialize registry, and expose as Bus extension.
*/
@PostConstruct
public void init() {
resolvers = new ArrayList<EndpointResolver>();
if (bus != null) {
bus.setExtension(this, EndpointResolverRegistry.class);
}
}
/**
* Register an endpoint resolver.
*
* @param resolver the EndpointResolver to add to the chain.
*/
public synchronized void register(EndpointResolver resolver) {
resolvers.add(resolver);
}
/**
* Unregister an endpoint resolver.
*
* @param resolver the EndpointResolver to remove from the chain.
*/
public synchronized void unregister(EndpointResolver resolver) {
resolvers.remove(resolver);
}
/**
* Walk the list of registered EndpointResolvers, so as to
* retrieve a concrete EPR corresponding to the given abstract EPR,
* returning a cached reference if already resolved.
* <p>
* This API is used by any actor that requires a concrete EPR (e.g.
* a transport-level Conduit), and must be called each and every
* time the EPR content is to be accessed (e.g. before each connection
* establishment attempt).
*
* @param logical the abstract EPR to resolve
* @return the resolved concrete EPR if appropriate, null otherwise
*/
public synchronized EndpointReferenceType resolve(EndpointReferenceType logical) {
EndpointReferenceType physical = null;
for (EndpointResolver resolver : resolvers) {
physical = resolver.resolve(logical);
if (physical != null) {
break;
}
}
return physical;
}
/**
* Walk the list of registered EndpointResolvers, so as to force a fresh
* resolution of the given abstract EPR, discarding any previously cached
* reference.
* <p>
* This API may be used by say the transport-level Conduit when it
* detects a non-transient error on the outgoing connection, or
* by any other actor in the dispatch with the ability to infer
* server-side unavailability.
*
* @param logical the previously resolved abstract EPR
* @param physical the concrete EPR to refresh
* @return the renewed concrete EPR if appropriate, null otherwise
*/
public EndpointReferenceType renew(EndpointReferenceType logical,
EndpointReferenceType physical) {
EndpointReferenceType fresh = null;
for (EndpointResolver resolver : resolvers) {
fresh = resolver.renew(logical, physical);
if (fresh != null) {
break;
}
}
return fresh;
}
/**
* Walk the list of registered EndpointResolvers, so as to mint a new
* abstract EPR for a given service name.
*
* @param serviceName
* @return the newly minted EPR if appropriate, null otherwise
*/
public EndpointReferenceType mint(QName serviceName) {
EndpointReferenceType logical = null;
for (EndpointResolver resolver : resolvers) {
logical = resolver.mint(serviceName);
if (logical != null) {
break;
}
}
return logical;
}
/**
* Walk the list of registered EndpointResolvers, so as to mint a new
* abstract EPR for a gievn physical EPR.
*
* @param serviceName
* @return the newly minted EPR if appropriate, null otherwise
*/
public EndpointReferenceType mint(EndpointReferenceType physical) {
EndpointReferenceType logical = null;
for (EndpointResolver resolver : resolvers) {
logical = resolver.mint(physical);
if (logical != null) {
break;
}
}
return logical;
}
/**
* @return the encapsulated list of registered resolvers
*/
protected List<EndpointResolver> getResolvers() {
return resolvers;
}
/**
* @param b Bus to encapsulate
*/
public void setBus(Bus b) {
bus = b;
}
}