/* 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.camunda.bpm.engine.impl.cmd;
import java.io.Serializable;
import java.util.List;
import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.history.HistoricProcessInstance;
import org.camunda.bpm.engine.impl.context.Context;
import org.camunda.bpm.engine.impl.interceptor.Command;
import org.camunda.bpm.engine.impl.interceptor.CommandContext;
import org.camunda.bpm.engine.impl.persistence.deploy.DeploymentCache;
import org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity;
import org.camunda.bpm.engine.impl.persistence.entity.ExecutionManager;
import org.camunda.bpm.engine.impl.persistence.entity.HistoricProcessInstanceEntity;
import org.camunda.bpm.engine.impl.persistence.entity.HistoricProcessInstanceManager;
import org.camunda.bpm.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.camunda.bpm.engine.impl.persistence.entity.TaskEntity;
import org.camunda.bpm.engine.impl.pvm.process.ActivityImpl;
import org.camunda.bpm.engine.impl.pvm.process.ProcessDefinitionImpl;
import org.camunda.bpm.engine.runtime.ProcessInstance;
import static org.camunda.bpm.engine.impl.util.EnsureUtil.*;
/**
* {@link Command} that changes the process definition version of an existing
* process instance.
*
* Warning: This command will NOT perform any migration magic and simply set the
* process definition version in the database, assuming that the user knows,
* what he or she is doing.
*
* This is only useful for simple migrations. The new process definition MUST
* have the exact same activity id to make it still run.
*
* Furthermore, activities referenced by sub-executions and jobs that belong to
* the process instance MUST exist in the new process definition version.
*
* The command will fail, if there is already a {@link ProcessInstance} or
* {@link HistoricProcessInstance} using the new process definition version and
* the same business key as the {@link ProcessInstance} that is to be migrated.
*
* If the process instance is not currently waiting but actively running, then
* this would be a case for optimistic locking, meaning either the version
* update or the "real work" wins, i.e., this is a race condition.
*
* @see http://forums.activiti.org/en/viewtopic.php?t=2918
* @author Falko Menge
*/
public class SetProcessDefinitionVersionCmd implements Command<Void>, Serializable {
private static final long serialVersionUID = 1L;
private final String processInstanceId;
private final Integer processDefinitionVersion;
public SetProcessDefinitionVersionCmd(String processInstanceId, Integer processDefinitionVersion) {
ensureNotEmpty("The process instance id is mandatory", "processInstanceId", processInstanceId);
ensureNotNull("The process definition version is mandatory", "processDefinitionVersion", processDefinitionVersion);
ensurePositive("The process definition version must be positive", "processDefinitionVersion", processDefinitionVersion);
this.processInstanceId = processInstanceId;
this.processDefinitionVersion = processDefinitionVersion;
}
public Void execute(CommandContext commandContext) {
// check that the new process definition is just another version of the same
// process definition that the process instance is using
ExecutionManager executionManager = commandContext.getExecutionManager();
ExecutionEntity processInstance = executionManager.findExecutionById(processInstanceId);
if (processInstance == null) {
throw new ProcessEngineException("No process instance found for id = '" + processInstanceId + "'.");
} else if (!processInstance.isProcessInstanceExecution()) {
throw new ProcessEngineException(
"A process instance id is required, but the provided id " +
"'"+processInstanceId+"' " +
"points to a child execution of process instance " +
"'"+processInstance.getProcessInstanceId()+"'. " +
"Please invoke the "+getClass().getSimpleName()+" with a root execution id.");
}
ProcessDefinitionImpl currentProcessDefinitionImpl = processInstance.getProcessDefinition();
DeploymentCache deploymentCache = Context
.getProcessEngineConfiguration()
.getDeploymentCache();
ProcessDefinitionEntity currentProcessDefinition;
if (currentProcessDefinitionImpl instanceof ProcessDefinitionEntity) {
currentProcessDefinition = (ProcessDefinitionEntity) currentProcessDefinitionImpl;
} else {
currentProcessDefinition = deploymentCache.findDeployedProcessDefinitionById(currentProcessDefinitionImpl.getId());
}
ProcessDefinitionEntity newProcessDefinition = deploymentCache
.findDeployedProcessDefinitionByKeyAndVersion(currentProcessDefinition.getKey(), processDefinitionVersion);
validateAndSwitchVersionOfExecution(commandContext, processInstance, newProcessDefinition);
// switch the historic process instance to the new process definition version
HistoricProcessInstanceManager historicProcessInstanceManager = commandContext.getHistoricProcessInstanceManager();
if (historicProcessInstanceManager.isHistoryEnabled()) {
HistoricProcessInstanceEntity historicProcessInstance = historicProcessInstanceManager.findHistoricProcessInstance(processInstanceId);
historicProcessInstance.setProcessDefinitionId(newProcessDefinition.getId());
}
// switch all sub-executions of the process instance to the new process definition version
List<ExecutionEntity> childExecutions = executionManager
.findChildExecutionsByParentExecutionId(processInstanceId);
for (ExecutionEntity executionEntity : childExecutions) {
validateAndSwitchVersionOfExecution(commandContext, executionEntity, newProcessDefinition);
}
return null;
}
protected void validateAndSwitchVersionOfExecution(CommandContext commandContext, ExecutionEntity execution, ProcessDefinitionEntity newProcessDefinition) {
// check that the new process definition version contains the current activity
if (execution.getActivity() != null) {
String activityId = execution.getActivity().getId();
ActivityImpl newActivity = newProcessDefinition.findActivity(activityId);
if (newActivity == null) {
throw new ProcessEngineException(
"The new process definition " +
"(key = '" + newProcessDefinition.getKey() + "') " +
"does not contain the current activity " +
"(id = '" + activityId + "') " +
"of the process instance " +
"(id = '" + processInstanceId + "').");
}
// clear cached activity so that outgoing transitions are refreshed
execution.setActivity(newActivity);
}
// switch the process instance to the new process definition version
execution.setProcessDefinition(newProcessDefinition);
// and change possible existing tasks (as the process definition id is stored there too)
List<TaskEntity> tasks = commandContext.getTaskManager().findTasksByExecutionId(execution.getId());
for (TaskEntity taskEntity : tasks) {
taskEntity.setProcessDefinitionId(newProcessDefinition.getId());
}
}
}