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The Drools and jBPM public API which is backwards compatible between releases.

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/*
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 *
 * 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.
 */

package org.drools.runtime.process;

import java.util.Map;

/**
 * A work item manager is responsible for finding the right
 * work item handler when a work item should be executed and
 * should be notified when this work item has been completed
 * (or aborted).
 */
public interface WorkItemManager {

    /**
     * Notifies the work item manager that the work item with the given
     * id has been completed.  Results related to the execution of this
     * work item can be passed.
     *
     * @param id the id of the work item that has been completed
     * @param results the results related to this work item, or null if there are no results
     */
    void completeWorkItem(long id,
                          Map results);

    /**
     * Notifies the work item manager that the work item with the given
     * id could not be executed and should be aborted.
     *
     * @param id the id of the work item that should be aborted
     */
    void abortWorkItem(long id);

    /**
     * Register the given handler for all work items of the given
     * type of work
     * 
     * @param workItemName the type of work this work item handler can execute
     * @param handler the handler for executing work items
     */
    void registerWorkItemHandler(String workItemName,
                                 WorkItemHandler handler);

}