/*
 * Copyright 2013 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.kie.api.runtime.manager.audit;

import java.util.Date;

/**
 * Audit view of variables that keeps track of all changes of variable identified by given name/id.
 * This means that variable log will contain both current and previous (if exists) value of the variable.
 *
 */
public interface VariableInstanceLog {

    /**
     * @return process instance identifier
     */
    Long getProcessInstanceId();

    /**
     * @return process id of the definition
     */
    String getProcessId();

    /**
     * @return additional information in case variable is defined on composite node level to be able to distinguish
     * it between top level and embedded level variables
     */
    String getVariableInstanceId();

    /**
     * @return identifier of the variable aka variable name
     */
    String getVariableId();

    /**
     * @return current value of the variable
     */
    String getValue();

    /**
     * @return previous value of the variable (if any)
     */
    String getOldValue();

    /**
     * @return date when the variable was set (to current value)
     */
    Date getDate();

    /**
     * @return external (optional) identifier associated with this process instance
     */
    String getExternalId();
}