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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.tuscany.sca.assembly;

import java.io.Serializable;

import org.apache.tuscany.sca.interfacedef.InterfaceContract;
import org.apache.tuscany.sca.policy.PolicySubject;

/**
 * Represents an endpoint reference. An SCA reference can reference service endpoints in a
 * number of ways. Target names, autowire, configured bindings. The endpoint reference
 * captures the result of specifying one of these things.
 *
 * @version $Rev: 1304128 $ $Date: 2012-03-22 16:19:17 -0700 (Thu, 22 Mar 2012) $
 * @tuscany.spi.extension.asclient
 */
public interface EndpointReference extends Base, PolicySubject, Cloneable, Serializable {

    /**
     * Status of the endpoint reference resolution
     */
    enum Status {
        NOT_CONFIGURED, // Not configured
        RESOLVED_BINDING, // The endpoint reference is configured with a binding
        AUTOWIRE_PLACEHOLDER, // Autowire to be performed
        WIRED_TARGET_NOT_FOUND, // Wire target not found
        WIRED_TARGET_FOUND_READY_FOR_MATCHING, // Wire target found and ready to be resolved to an endpoint
        WIRED_TARGET_FOUND_AND_MATCHED, // Wire target found and resolved to an endpoint
        WIRED_TARGET_IN_BINDING_URI // SCA target specified by the binding uri
    };

    /**
     * Get the structural URI of the reference binding
     * @return The structural URI of the reference/binding
     */
    String getURI();

    /**
     * Set the structural URI of the reference binding
     * @param uri <componentURI>#reference-binding(referenceName/bindingName)
     * or <componentURI>#reference(referenceName) if binding is not present
     *
     */
    void setURI(String uri);

    /**
     * Supports endpoint reference cloning
     *
     * @return endpointReference
     * @throws CloneNotSupportedException
     */
    Object clone() throws CloneNotSupportedException;

    /**
     * Get the component model object
     *
     * @return component
     */
    Component getComponent();

    /**
     * Set the  component model object
     *
     * @param component the component for the endpoint
     */
    void setComponent(Component component);

    /**
     * Get the source component reference model object
     *
     * @return reference the source component reference  for the endpoint
     */
    ComponentReference getReference();

    /**
     * Set the source component reference model object
     *
     * @param reference
     */
    void setReference(ComponentReference reference);

    /**
     * Get the resolved reference binding
     *
     * @return binding the resolved reference binding
     */
    Binding getBinding();

    /**
     * Set the resolved reference binding
     *
     * @param binding the resolved reference binding
     */
    void setBinding(Binding binding);

    /**
     * Get the target endpoint
     *
     * @return endpoint the target endpoint
     */
    Endpoint getTargetEndpoint();

    /**
     * Set the target endpoint model object
     *
     * @param endpoint the target endpoint
     */
    void setTargetEndpoint(Endpoint targetEndpoint);
    
    /**
     * Get the deployed URI of the corresponding service endpoint
     * @return The deployed URI
     */
    String getDeployedURI();
    /**
     * Set the deployed URI
     * @param deployedURI
     */
    void setDeployedURI(String deployedURI);

    /**
     * Returns the interface contract defining the interface
     *
     * @return the interface contract
     */
    InterfaceContract getComponentReferenceInterfaceContract();

    /**
     * Get the reference callback endpoint that
     * represents that target endpoint to which callback
     * messages will be directed
     *
     * @return callbackEndpoint the reference callback endpoint
     */
    Endpoint getCallbackEndpoint();

    /**
     * Set the reference callback endpoint
     *
     * @param callbackEndpoint the reference callback endpoint
     */
    void setCallbackEndpoint(Endpoint callbackEndpoint);

    /**
     * Rather than relying on combinations of unresolved flags and 
     * other data we maintain a status enumeration
     * 
     * @return status
     */
    Status getStatus();

    /**
     * Rather than relying on combinations of unresolved flags and 
     * other data we maintain a status enumeration
     * 
     * @param status the new status
     */
    void setStatus(Status status);
    
    /**
     * When true this endpoint reference is able to process the invocation
     * asynchronously. The forward call is effectively one-way
     * and the response will arrive asynchronously
     * 
     * @return true if the reference is asynchronous
     */
    boolean isAsyncInvocation();
}