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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * Licensed 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.
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 */
package org.fabric3.spi.container.wire;

import org.fabric3.spi.container.invocation.Message;

/**
 * Mediates a service invocation.
 */
public interface Interceptor {

    /**
     * Mediates a service invocation.
     *
     * @param msg the request Message for the invocation
     * @return the response Message from the invocation
     */
    Message invoke(Message msg);

    /**
     * Sets the next interceptor in the invocation chain.
     *
     * @param next the next interceptor
     */
    void setNext(Interceptor next);

    /**
     * Returns the next interceptor in the invocation chain or null if the interceptor is the last one.
     *
     * @return the next interceptor or null
     */
    Interceptor getNext();

}