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/*
 * Copyright (c) 2012 Imre Fazekas.
 *  All rights reserved.
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 *  Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *  Neither the name of the Brillien nor the names of its
 *  terms and concepts may be used to endorse or promote products derived from this
 *  software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

package com.vii.brillien.kernel.axiom.atomic;

import com.vii.brillien.kernel.BrillienException;
import com.vii.brillien.kernel.axiom.transport.Communication;

import java.util.HashMap;
import java.util.List;

/**
 * Flow are the high-level component to provide flow-related functionality. Every component is mandatorly assigned to a flow componen.
 * Flows shows tree structure, refining the overall processes of the given application.
 * According to the specification of the Brillien, there are several services provided by a flow:
 * - sharing
 * - acknowledgement about the commmunication of their components
 * - possible fault handling
 * - etc.
 */
public interface Flow

extends Context{ /** * @return the identifier of the flow instance */ String getFlowID(); /** * Setter method for the ID * @param flowID identifier of the given flow * @return the flow instance itself */ Flow setFlowID(String flowID); /** * Tells whether this Flow represents an action which cannot fail, so cluster replication is needed. */ boolean isIndispensable(); /** * Setter method for an indispensable flow */ void setIndispensable( boolean indispensable ); /** * Report method to share any communication related information of the components with the container flow instance. * @param reporter reporter Presence reference * @param message communication' message name */ void report( Presence reporter, String message ); /** * Report method to share any communication related information of the components with the container flow instance. * @param reporter reporter Presence reference * @param message communication' message name * @param params communication' message oarameters */ void report( Presence reporter, String message, List params ); /** * Returns the result of the flow if it exists */ T getFlowResult(); /** * Sets the result of the flow */ void setFlowResult( Object result ); /** * Activates the flow instance, making it started. * @throws BrillienException in case of operation failure */ void activate( C c, Long timeout ) throws BrillienException; /** * Gets the parameters gotten while the given flow has been activated with. * @return */ C getActivationData(); /** * Sets all state of a flow to "Error" state marking it to be terminated. * @throws BrillienException in case of operation failure */ void oppress( String message ) throws BrillienException; /** * Sets all state of a flow to "Exit" state marking it to be terminated. * @throws BrillienException in case of operation failure */ void terminate() throws BrillienException; /** * Tells whether the flow has been suspended. */ boolean isSuspended(); /** * All Indispensable flows can be suspended and resumed. This method makes all the necessary infromation (id, current states) persisted about a given flow. * Fot all non indispensable flow, an exception will be thrown. * @throws BrillienException in case of suspend failure or the non-indispensable nature of the given flow instance */ void suspend() throws BrillienException; /** * Notify the given flow instance about the occured revivfication process. */ void revivified() throws BrillienException; /** * This method retrieves the state space of the flow called when the flow will be suspended */ HashMap getStateSpace(); /** * This method sets the state space of the flow called when the flow will be reactivated */ void setStateSpace( HashMap stateSpace ) throws BrillienException; }