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/**
 * 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.List;
import java.util.concurrent.CopyOnWriteArrayList;

import javax.xml.namespace.QName;

import org.apache.cxf.Bus;
import org.apache.cxf.common.injection.NoJSR250Annotations;
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.
 * 

* 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. */ @NoJSR250Annotations public class EndpointResolverRegistryImpl implements EndpointResolverRegistry { private Bus bus; private List resolvers = new CopyOnWriteArrayList(); public EndpointResolverRegistryImpl() { } public EndpointResolverRegistryImpl(Bus b) { setBus(b); } /** * @param b Bus to encapsulate */ public final void setBus(Bus b) { bus = b; 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. *

* 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. *

* 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 getResolvers() { return resolvers; } }





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