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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.camunda.bpm.engine.impl.cmd;

import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.delegate.DelegateExecution;
import org.camunda.bpm.engine.history.HistoricProcessInstance;
import org.camunda.bpm.engine.impl.ProcessInstanceQueryImpl;
import org.camunda.bpm.engine.impl.cfg.CommandChecker;
import org.camunda.bpm.engine.impl.history.HistoryLevel;
import org.camunda.bpm.engine.impl.history.event.HistoricProcessInstanceEventEntity;
import org.camunda.bpm.engine.impl.history.event.HistoryEvent;
import org.camunda.bpm.engine.impl.history.event.HistoryEventProcessor;
import org.camunda.bpm.engine.impl.history.event.HistoryEventTypes;
import org.camunda.bpm.engine.impl.history.producer.HistoryEventProducer;
import org.camunda.bpm.engine.impl.interceptor.CommandContext;
import org.camunda.bpm.engine.impl.management.UpdateJobSuspensionStateBuilderImpl;
import org.camunda.bpm.engine.impl.persistence.entity.*;
import org.camunda.bpm.engine.impl.runtime.UpdateProcessInstanceSuspensionStateBuilderImpl;
import org.camunda.bpm.engine.runtime.ProcessInstance;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @author Daniel Meyer
 * @author Joram Barrez
 * @author roman.smirnov
 */
public abstract class AbstractSetProcessInstanceStateCmd extends AbstractSetStateCmd {

  protected final String processInstanceId;
  protected String processDefinitionId;
  protected String processDefinitionKey;

  protected String processDefinitionTenantId;
  protected boolean isProcessDefinitionTenantIdSet = false;

  public AbstractSetProcessInstanceStateCmd(UpdateProcessInstanceSuspensionStateBuilderImpl builder) {
    super(true, null);

    this.processInstanceId = builder.getProcessInstanceId();
    this.processDefinitionId = builder.getProcessDefinitionId();
    this.processDefinitionKey = builder.getProcessDefinitionKey();
    this.processDefinitionTenantId = builder.getProcessDefinitionTenantId();
    this.isProcessDefinitionTenantIdSet = builder.isProcessDefinitionTenantIdSet();
  }

  @Override
  protected void checkParameters(CommandContext commandContext) {
    if(processInstanceId == null && processDefinitionId == null && processDefinitionKey == null) {
      throw new ProcessEngineException("ProcessInstanceId, ProcessDefinitionId nor ProcessDefinitionKey cannot be null.");
    }
  }

  @Override
  protected void checkAuthorization(CommandContext commandContext) {

    for(CommandChecker checker : commandContext.getProcessEngineConfiguration().getCommandCheckers()) {
      if (processInstanceId != null) {
        checker.checkUpdateProcessInstanceSuspensionStateById(processInstanceId);
      } else

      if (processDefinitionId != null) {
        checker.checkUpdateProcessInstanceSuspensionStateByProcessDefinitionId(processDefinitionId);
      } else

      if (processDefinitionKey != null) {
        checker.checkUpdateProcessInstanceSuspensionStateByProcessDefinitionKey(processDefinitionKey);
      }
    }
  }

  @Override
  protected void updateSuspensionState(CommandContext commandContext, SuspensionState suspensionState) {
    ExecutionManager executionManager = commandContext.getExecutionManager();
    TaskManager taskManager = commandContext.getTaskManager();
    ExternalTaskManager externalTaskManager = commandContext.getExternalTaskManager();

    if (processInstanceId != null) {
      executionManager.updateExecutionSuspensionStateByProcessInstanceId(processInstanceId, suspensionState);
      taskManager.updateTaskSuspensionStateByProcessInstanceId(processInstanceId, suspensionState);
      externalTaskManager.updateExternalTaskSuspensionStateByProcessInstanceId(processInstanceId, suspensionState);

    } else if (processDefinitionId != null) {
      executionManager.updateExecutionSuspensionStateByProcessDefinitionId(processDefinitionId, suspensionState);
      taskManager.updateTaskSuspensionStateByProcessDefinitionId(processDefinitionId, suspensionState);
      externalTaskManager.updateExternalTaskSuspensionStateByProcessDefinitionId(processDefinitionId, suspensionState);

    } else if (isProcessDefinitionTenantIdSet) {
      executionManager.updateExecutionSuspensionStateByProcessDefinitionKeyAndTenantId(processDefinitionKey, processDefinitionTenantId, suspensionState);
      taskManager.updateTaskSuspensionStateByProcessDefinitionKeyAndTenantId(processDefinitionKey, processDefinitionTenantId, suspensionState);
      externalTaskManager.updateExternalTaskSuspensionStateByProcessDefinitionKeyAndTenantId(processDefinitionKey, processDefinitionTenantId, suspensionState);

    } else {
      executionManager.updateExecutionSuspensionStateByProcessDefinitionKey(processDefinitionKey, suspensionState);
      taskManager.updateTaskSuspensionStateByProcessDefinitionKey(processDefinitionKey, suspensionState);
      externalTaskManager.updateExternalTaskSuspensionStateByProcessDefinitionKey(processDefinitionKey, suspensionState);
    }
  }

  @Override
  protected void triggerHistoryEvent(CommandContext commandContext){
    HistoryLevel historyLevel = commandContext.getProcessEngineConfiguration().getHistoryLevel();
    List updatedProcessInstances = obtainProcessInstances(commandContext);
    //suspension state is not updated synchronously
    if (getNewSuspensionState() != null && updatedProcessInstances != null) {
      for (final ProcessInstance processInstance: updatedProcessInstances) {

        if (historyLevel.isHistoryEventProduced(HistoryEventTypes.PROCESS_INSTANCE_UPDATE, processInstance)) {
          HistoryEventProcessor.processHistoryEvents(new HistoryEventProcessor.HistoryEventCreator() {
            @Override
            public HistoryEvent createHistoryEvent(HistoryEventProducer producer) {
              HistoricProcessInstanceEventEntity processInstanceUpdateEvt = (HistoricProcessInstanceEventEntity)
                  producer.createProcessInstanceUpdateEvt((DelegateExecution) processInstance);
              if (SuspensionState.SUSPENDED.getStateCode() == getNewSuspensionState().getStateCode()) {
                processInstanceUpdateEvt.setState(HistoricProcessInstance.STATE_SUSPENDED);
              } else {
                processInstanceUpdateEvt.setState(HistoricProcessInstance.STATE_ACTIVE);
              }
              return processInstanceUpdateEvt;
            }
          });
        }
      }
    }
  }

  protected List obtainProcessInstances(CommandContext commandContext) {
    ProcessInstanceQueryImpl query = new ProcessInstanceQueryImpl();
    if (processInstanceId != null) {
      query.processInstanceId(processInstanceId);
    } else if (processDefinitionId != null) {
      query.processDefinitionId(processDefinitionId);
    } else if (isProcessDefinitionTenantIdSet) {
      query.processDefinitionKey(processDefinitionKey);
      if (processDefinitionTenantId != null) {
        query.tenantIdIn(processDefinitionTenantId);
      } else {
        query.withoutTenantId();
      }
    } else {
      query.processDefinitionKey(processDefinitionKey);
    }
    List result = new ArrayList();
    result.addAll(commandContext.getExecutionManager().findProcessInstancesByQueryCriteria(query,null));
    return result;
  }

  @Override
  protected void logUserOperation(CommandContext commandContext) {
    PropertyChange propertyChange = new PropertyChange(SUSPENSION_STATE_PROPERTY, null, getNewSuspensionState().getName());
    commandContext.getOperationLogManager()
      .logProcessInstanceOperation(getLogEntryOperation(), processInstanceId, processDefinitionId,
        processDefinitionKey, Collections.singletonList(propertyChange));
  }

  protected UpdateJobSuspensionStateBuilderImpl createJobCommandBuilder() {
    UpdateJobSuspensionStateBuilderImpl builder = new UpdateJobSuspensionStateBuilderImpl();

    if (processInstanceId != null) {
      builder.byProcessInstanceId(processInstanceId);

    } else if (processDefinitionId != null) {
      builder.byProcessDefinitionId(processDefinitionId);

    } else if (processDefinitionKey != null) {
      builder.byProcessDefinitionKey(processDefinitionKey);

      if (isProcessDefinitionTenantIdSet && processDefinitionTenantId != null) {
        return builder.processDefinitionTenantId(processDefinitionTenantId);

      } else if (isProcessDefinitionTenantIdSet) {
        return builder.processDefinitionWithoutTenantId();
      }
    }
    return builder;
  }

  @Override
  protected AbstractSetJobStateCmd getNextCommand() {
    UpdateJobSuspensionStateBuilderImpl jobCommandBuilder = createJobCommandBuilder();

    return getNextCommand(jobCommandBuilder);
  }

  protected abstract AbstractSetJobStateCmd getNextCommand(UpdateJobSuspensionStateBuilderImpl jobCommandBuilder);

}