/* 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.flowable.engine.impl.cmd;

import java.io.Serializable;

import org.flowable.common.engine.impl.interceptor.Command;
import org.flowable.common.engine.impl.interceptor.CommandContext;
import org.flowable.engine.impl.cfg.ProcessEngineConfigurationImpl;
import org.flowable.engine.impl.util.CommandContextUtil;
import org.flowable.entitylink.api.history.HistoricEntityLinkService;

public class DeleteRelatedDataOfRemovedHistoricProcessInstancesCmd implements Command<Object>, Serializable {

    private static final long serialVersionUID = 1L;

    @Override
    public Object execute(CommandContext commandContext) {
        ProcessEngineConfigurationImpl processEngineConfiguration = CommandContextUtil.getProcessEngineConfiguration(commandContext);
        processEngineConfiguration.getIdentityLinkServiceConfiguration().getHistoricIdentityLinkService().deleteHistoricProcessIdentityLinksForNonExistingInstances();
        processEngineConfiguration.getIdentityLinkServiceConfiguration().getHistoricIdentityLinkService().deleteHistoricTaskIdentityLinksForNonExistingInstances();
        HistoricEntityLinkService historicEntityLinkService = processEngineConfiguration.getEntityLinkServiceConfiguration().getHistoricEntityLinkService();
        if (historicEntityLinkService != null) {
            historicEntityLinkService.deleteHistoricEntityLinksForNonExistingProcessInstances();
        }
        processEngineConfiguration.getTaskServiceConfiguration().getHistoricTaskService().deleteHistoricTaskLogEntriesForNonExistingProcessInstances();
        processEngineConfiguration.getVariableServiceConfiguration().getHistoricVariableService().deleteHistoricVariableInstancesForNonExistingProcessInstances();
        processEngineConfiguration.getHistoricDetailEntityManager().deleteHistoricDetailForNonExistingProcessInstances();

        return null;
    }

}

@@ -1647,28 +1647,82 @@
 nstances();%0A
-    
+%09if (processEngineConfiguration.isEnableEntityLinks()) %7B%0A%09
     Historic
@@ -1858,28 +1858,25 @@
 kService();%0A
-    
+%09
     if (hist
@@ -1912,20 +1912,10 @@
 ) %7B%0A
-            
+%09%09
 hist
@@ -1995,24 +1995,24 @@
 nces();%0A
+%09
     
-    
+%7D%0A%09
 %7D%0A      

check if identity links enabled before attempting to get historicEntityLinkService