modules/node-api/src/main/java/org/apache/tuscany/sca/node/SCAClient.java

/*
 * 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.tuscany.sca.node;

import org.osoa.sca.CallableReference;
import org.osoa.sca.ServiceReference;


/**
 * Provides client access to the services in a domain.
 *
 * @version $Rev$ $Date$
 */
public interface SCAClient {

    /**
     * Cast a type-safe reference to a CallahbleReference. Converts a type-safe
     * reference to an equivalent CallableReference; if the target refers to a
     * service then a ServiceReference will be returned, if the target refers to
     * a callback then a CallableReference will be returned.
     *
     * @param target a reference proxy provided by the SCA runtime
     * @param <B> the Java type of the business interface for the reference
     * @param <R> the type of reference to be returned
     * @return a CallableReference equivalent for the proxy
     * @throws IllegalArgumentException if the supplied instance is not a
     *             reference supplied by the SCA runtime
     */
    <B, R extends CallableReference<B>> R cast(B target) throws IllegalArgumentException;

    /**
     * Returns a proxy for a service provided by a component in the SCA domain.
     *
     * @param businessInterface the interface that will be used to invoke the
     *            service
     * @param serviceName the name of the service
     * @param <B> the Java type of the business interface for the service
     * @return an object that implements the business interface
     */
    <B> B getService(Class<B> businessInterface, String serviceName);

    /**
     * Returns a ServiceReference for a service provided by a component in the
     * SCA domain.
     *
     * @param businessInterface the interface that will be used to invoke the
     *            service
     * @param serviceName the name of the service
     * @param <B> the Java type of the business interface for the service
     * @return a ServiceReference for the designated service
     */
    <B> ServiceReference<B> getServiceReference(Class<B> businessInterface, String serviceName);

}