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/*
 * Fabric3
 * Copyright (c) 2009-2011 Metaform Systems
 *
 * Fabric3 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version, with the
 * following exception:
 *
 * Linking this software statically or dynamically with other
 * modules is making a combined work based on this software.
 * Thus, the terms and conditions of the GNU General Public
 * License cover the whole combination.
 *
 * As a special exception, the copyright holders of this software
 * give you permission to link this software with independent
 * modules to produce an executable, regardless of the license
 * terms of these independent modules, and to copy and distribute
 * the resulting executable under terms of your choice, provided
 * that you also meet, for each linked independent module, the
 * terms and conditions of the license of that module. An
 * independent module is a module which is not derived from or
 * based on this software. If you modify this software, you may
 * extend this exception to your version of the software, but
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 * delete this exception statement from your version.
 *
 * Fabric3 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the
 * GNU General Public License along with Fabric3.
 * If not, see .
 *
 * ----------------------------------------------------
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 *
 */
package org.fabric3.spi.wire;

import org.fabric3.spi.model.physical.PhysicalOperationDefinition;

/**
 * A wire consists of 1..n invocation chains associated with the operations of its source service contract.
 * 
 * Invocation chains contain Interceptors that process invocations in an around-style manner.
 *
 * @version $Rev: 9763 $ $Date: 2011-01-03 00:48:06 +0000 (Mon, 03 Jan 2011) $
 */
public interface InvocationChain {

    /**
     * Returns the target physical operation for this invocation chain.
     *
     * @return the target physical operation for this invocation chain
     */
    PhysicalOperationDefinition getPhysicalOperation();

    /**
     * Adds an interceptor to the chain
     *
     * @param interceptor the interceptor to add
     */
    void addInterceptor(Interceptor interceptor);

    /**
     * Adds an interceptor at the given position in the interceptor stack
     *
     * @param index       the position in the interceptor stack to add the interceptor
     * @param interceptor the interceptor to add
     */
    void addInterceptor(int index, Interceptor interceptor);

    /**
     * Returns the first interceptor in the chain.
     *
     * @return the first interceptor in the chain
     */
    Interceptor getHeadInterceptor();

    /**
     * Returns the last interceptor in the chain.
     *
     * @return the last interceptor in the chain
     */
    Interceptor getTailInterceptor();

}