# KmeliaOperationContext.java

    /*
     * Copyright (C) 2000 - 2024 Silverpeas
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU Affero General Public License as
     * published by the Free Software Foundation, either version 3 of the
     * License, or (at your option) any later version.
     *
     * As a special exception to the terms and conditions of version 3.0 of
     * the GPL, you may redistribute this Program in connection with Free/Libre
     * Open Source Software ("FLOSS") applications as described in Silverpeas's
     * FLOSS exception.  You should have received a copy of the text describing
     * the FLOSS exception, and it is also available here:
     * "https://www.silverpeas.org/legal/floss_exception.html"
     *
     * This program 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 Affero General Public License for more details.
     *
     * You should have received a copy of the GNU Affero General Public License
     * along with this program.  If not, see <https://www.gnu.org/licenses/>.
     */

    package org.silverpeas.components.kmelia.service;

    import org.silverpeas.core.admin.user.model.User;
    import org.silverpeas.core.cache.service.CacheAccessorProvider;
    import org.silverpeas.core.persistence.datasource.OperationContext;

    import java.util.Optional;

    /**
     * Defines the context of a mutable operation on publications that is currently invoked in Kmelia.
     * Useful to maintain the operation state along different invocations, mainly with system
     * notifications that are processed by different transverse services.
     * @author mmoquillon
     */
    public class KmeliaOperationContext {

      private static final String CACHE_KEY = "@@@KmeliaOperationContext@@@";
      private final OperationType operation;

      /**
       * Gets the current operation context. None if no such a context has been set.
       * @return optionally the current operation context if any.
       */
      public static Optional<KmeliaOperationContext> current() {
        return Optional.ofNullable(CacheAccessorProvider.getThreadCacheAccessor()
            .getCache()
            .get(CACHE_KEY, KmeliaOperationContext.class));
      }

      /**
       * Spawn a new Kmelia context about the given operation on publications.
       * @param type the type of the operation.
       */
      public static void about(final OperationType type) {
        KmeliaOperationContext context = new KmeliaOperationContext(type);
        CacheAccessorProvider.getThreadCacheAccessor().getCache().put(CACHE_KEY, context);
      }

      private KmeliaOperationContext(final OperationType type) {
        this.operation = type;
      }

      public boolean isAbout(final OperationType type) {
        return this.operation == type;
      }

      public User getInvoker() {
        return OperationContext.fromCurrentRequester().getUser();
      }

      /**
       * Different kinds of operations.
       */
      public enum OperationType {
        /**
         * A publication is being created.
         */
        CREATION,
        /**
         * A publication is being updated.
         */
        UPDATE,
        /**
         * A publication is being removed (that is moved into the trash).
         */
        REMOVING,
        /**
         * A publication is being deleted (id est definitely deleted).
         */
        DELETION
      }
    }