protected void migrateProcessInstance(MigratingProcessInstance migratingProcessInstance) {
MigratingActivityInstance rootActivityInstance =
migratingProcessInstance.getMigratingInstance(
migratingProcessInstance.getProcessInstanceId());
migrateActivityInstance(
migratingProcessInstance, new MigratingExecutionBranch(), rootActivityInstance);
}
protected void migrateActivityInstance(
MigratingProcessInstance migratingProcessInstance,
MigratingExecutionBranch migratingExecutionBranch,
MigratingActivityInstance migratingActivityInstance) {
ActivityInstance activityInstance = migratingActivityInstance.getActivityInstance();
if (!activityInstance.getId().equals(activityInstance.getProcessInstanceId())) {
final MigratingActivityInstance parentMigratingInstance =
migratingProcessInstance.getMigratingInstance(
activityInstance.getParentActivityInstanceId());
ScopeImpl targetFlowScope = migratingActivityInstance.getTargetScope().getFlowScope();
ScopeImpl parentActivityInstanceTargetScope = parentMigratingInstance.getTargetScope();
if (targetFlowScope != parentActivityInstanceTargetScope) {
// create intermediate scopes
ExecutionEntity flowScopeExecution = migratingActivityInstance.getFlowScopeExecution();
// 1. detach activity instance
migratingActivityInstance.detachState();
// 2. manipulate execution tree
ExecutionEntity targetExecution = migratingExecutionBranch.getExecution(targetFlowScope);
if (targetExecution == null) {
targetExecution =
createMissingTargetFlowScopeExecution(
flowScopeExecution, (PvmActivity) targetFlowScope);
migratingExecutionBranch.registerExecution(targetFlowScope, targetExecution);
} else {
targetExecution = (ExecutionEntity) targetExecution.createConcurrentExecution();
}
// 3. attach to newly created execution
migratingActivityInstance.attachState(targetExecution);
}
}
// 4. update state (e.g. activity id)
migratingActivityInstance.migrateState();
// 5. migrate instance state other than execution-tree structure
migratingActivityInstance.migrateDependentEntities();
// Let activity instances on the same level of subprocess share the same execution context
// of newly created scope executions.
// This ensures that newly created scope executions
// * are reused to attach activity instances to when the activity instances share a
// common ancestor path to the process instance
// * are not reused when activity instances are in unrelated branches of the execution tree
migratingExecutionBranch = migratingExecutionBranch.copy();
for (ActivityInstance childInstance : activityInstance.getChildActivityInstances()) {
MigratingActivityInstance migratingChildInstance =
migratingProcessInstance.getMigratingInstance(childInstance.getId());
migrateActivityInstance(
migratingProcessInstance, migratingExecutionBranch, migratingChildInstance);
}
}