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Service Component Architecture V1.0 Java API and Annotations
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/**
 * SCA4J
 * Copyright (c) 2009 - 2099 Service Symphony Ltd
 *
 * Licensed to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  A copy of the license
 * is included in this distrubtion or you may obtain a copy at
 *
 *    http://www.opensource.org/licenses/apache2.0.php
 *
 * 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.
 *
 * This project contains code licensed from the Apache Software Foundation under
 * the Apache License, Version 2.0 and original code from project contributors.
 *
 *
 * Original Codehaus Header
 *
 * Copyright (c) 2007 - 2008 fabric3 project contributors
 *
 * Licensed to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  A copy of the license
 * is included in this distrubtion or you may obtain a copy at
 *
 *    http://www.opensource.org/licenses/apache2.0.php
 *
 * 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.
 *
 * This project contains code licensed from the Apache Software Foundation under
 * the Apache License, Version 2.0 and original code from project contributors.
 *
 * Original Apache Header
 *
 * Copyright (c) 2005 - 2006 The Apache Software Foundation
 *
 * Apache Tuscany is an effort undergoing incubation at The Apache Software
 * Foundation (ASF), sponsored by the Apache Web Services PMC. Incubation is
 * required of all newly accepted projects until a further review indicates that
 * the infrastructure, communications, and decision making process have stabilized
 * in a manner consistent with other successful ASF projects. While incubation
 * status is not necessarily a reflection of the completeness or stability of the
 * code, it does indicate that the project has yet to be fully endorsed by the ASF.
 *
 * This product includes software developed by
 * The Apache Software Foundation (http://www.apache.org/).
 */
package org.osoa.sca;

/**
 * Interface providing programmatic access to a component's SCA context as an alternative to injection.
 * It provides access to reference and property values for the component and provides a mechanism for
 * obtaining a reference to a service that can be passed to other components.
 * 
 * SCA components obtain an instance of this interface through injection. Non-SCA client code may also
 * obtain an instance through runtime-specific mechanisms.
 * 
 * @version $Rev: 1 $ $Date: 2007-05-14 18:40:37 +0100 (Mon, 14 May 2007) $
 */
public interface ComponentContext {
    /**
     * Returns the absolute URI of the component within the SCA Domain.
     *
     * @return the absolute URI of the component
     */
    String getURI();

    /**
     * Cast a type-safe reference to a CallableReference.
     * 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  the Java type of the business interface for the reference
     * @param  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
     */
    > R cast(B target) throws IllegalArgumentException;

    /**
     * Returns a proxy for a reference defined by this component.
     *
     * @param businessInterface the interface that will be used to invoke the service
     * @param referenceName the name of the reference
     * @param  the Java type of the business interface for the reference
     * @return an object that implements the business interface
     */
     B getService(Class businessInterface, String referenceName);

    /**
     * Returns a ServiceReference for a reference defined by this component.
     *
     * @param businessInterface the interface that will be used to invoke the service
     * @param referenceName the name of the reference
     * @param  the Java type of the business interface for the reference
     * @return a ServiceReference for the designated reference
     */
     ServiceReference getServiceReference(Class businessInterface, String referenceName);

    /**
     * Returns the value of an SCA property defined by this component.
     *
     * @param type the Java type to be returned for the property
     * @param propertyName the name of the property whose value should be returned
     * @param  the Java type of the property
     * @return the property value
     */
     B getProperty(Class type, String propertyName);

    /**
     * Returns a ServiceReference that can be used to invoke this component over the default service.
     *
     * @param businessInterface the interface that will be used to invoke the service
     * @param  the Java type of the business interface for the reference
     * @return a ServiceReference that will invoke this component
     */
     ServiceReference createSelfReference(Class businessInterface);

    /**
     * Returns a ServiceReference that can be used to invoke this component over the designated service.
     *
     * @param businessInterface the interface that will be used to invoke the service
     * @param serviceName the name of the service to invoke
     * @param  the Java type of the business interface for the reference
     * @return a ServiceReference that will invoke this component
     */
     ServiceReference createSelfReference(Class businessInterface, String serviceName);

    /**
     * Returns the context for the current SCA service request, or null if there is no current request
     * or if the context is unavailable.
     *
     * @return the SCA request context; may be null
     */
    RequestContext getRequestContext();
}