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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 javax.xml.namespace.QName;

import org.apache.cxf.ws.addressing.EndpointReferenceType;

/**
 * Implementations of this interface are 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.
 */
public interface EndpointResolverRegistry {
    /**
     * Register an endpoint resolver.
     *
     * @param resolver the EndpointResolver to add to the chain.
     */
    void register(EndpointResolver resolver);

    /**
     * Unregister an endpoint resolver.
     *
     * @param resolver the EndpointResolver to remove from the chain.
     */
    void unregister(EndpointResolver 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
     */
    EndpointReferenceType resolve(EndpointReferenceType logical);

    /**
     * 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
     */
    EndpointReferenceType renew(EndpointReferenceType logical,
                                EndpointReferenceType physical);
    
    /**
     * 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
     */
    EndpointReferenceType mint(QName serviceName);
    
    /**
     * Walk the list of registered EndpointResolvers, so as to mint a new 
     * abstract EPR for a gievn physical EPR.
     * 
     * @param physical 
     * @return the newly minted EPR if appropriate, null otherwise
     */
    EndpointReferenceType mint(EndpointReferenceType physical);

}