org.camunda.bpm.engine.impl.pvm.runtime

Class LegacyBehavior

java.lang.Object

org.camunda.bpm.engine.impl.pvm.runtime.LegacyBehavior

public class LegacyBehavior
extends Object

This class encapsulates legacy runtime behavior for the process engine.

Since 7.3 the behavior of certain bpmn elements has changed slightly.

1. Some elements which did not used to be scopes are now scopes:

• Sequential multi instance Embedded Subprocess: is now a scope, used to be non-scope.
• Event subprocess: is now a scope, used to be non-scope.

2. In certain situations, executions which were both scope and concurrent were created. This used to be the case if a scope execution already had a single scope child execution and then concurrency was introduced (by a on interrupting boundary event or a non-interrupting event subprocess). In that case the existing scope execution was made concurrent. Starting from 7.3 this behavior is considered legacy. The new behavior is that the existing scope execution will not be made concurrent, instead, a new, concurrent execution will be created and be interleaved between the parent and the existing scope execution.

Since:

7.3

Author:

Daniel Meyer

Constructor Summary

Constructors

Constructor and Description
LegacyBehavior()

Method Summary

Methods

Modifier and Type	Method and Description
protected static boolean	areEqualEventSubscriptions(EventSubscriptionEntity subscription1, EventSubscriptionEntity subscription2) Checks if the parameters are the same apart from the execution id
static void	cancelConcurrentScope(PvmExecutionImpl execution, PvmActivity cancelledScopeActivity) Cancels an execution which is both concurrent and scope.
static Map<ScopeImpl,PvmExecutionImpl>	createActivityExecutionMapping(List<PvmExecutionImpl> scopeExecutions, List<ScopeImpl> scopes) Creates an activity execution mapping, when the scope hierarchy and the execution hierarchy are out of sync.
static void	destroyConcurrentScope(PvmExecutionImpl execution) Destroys a concurrent scope Execution.
static boolean	destroySecondNonScope(PvmExecutionImpl execution) Destroy an execution for an activity that was previously not a scope and now is (e.g.
static PvmExecutionImpl	determinePropagatingExecutionOnEnd(PvmExecutionImpl propagatingExecution) Tolerates the broken execution trees fixed with CAM-3727 where there may be more ancestor scope executions than ancestor flow scopes; In that case, the argument execution is removed, the parent execution of the argument is returned such that one level of mismatch is corrected.
protected static void	ensureConcurrent(PvmExecutionImpl execution)
protected static void	ensureConcurrentScope(PvmExecutionImpl execution)
protected static void	ensureScope(PvmExecutionImpl execution)
static boolean	eventSubprocessComplete(ActivityExecution scopeExecution)
static boolean	eventSubprocessConcurrentChildExecutionEnded(ActivityExecution scopeExecution, ActivityExecution endedExecution)
static PvmExecutionImpl	getScopeExecution(ScopeImpl scope, Map<ScopeImpl,PvmExecutionImpl> activityExecutionMapping) In case the process instance was migrated from a previous version, activities which are now parsed as scopes do not have scope executions.
static boolean	isConcurrentScope(PvmExecutionImpl propagatingExecution) Concurrent + scope executions are legacy and could occur in processes with non-interrupting boundary events or event subprocesses
protected static boolean	isLegacyAsyncAtMultiInstance(PvmExecutionImpl execution) This returns true only if the provided execution has reached its wait state in a legacy engine version, because only in that case, it can be async and waiting at the inner activity wrapped by the miBody.
protected static boolean	isLegacyBehaviorRequired(ActivityExecution scopeExecution) This method
static void	migrateMultiInstanceJobDefinitions(ProcessDefinitionEntity processDefinition, List<JobDefinitionEntity> jobDefinitions)
static void	parseCancelBoundaryEvent(ActivityImpl activity)
static void	pruneConcurrentScope(PvmExecutionImpl execution) Prunes a concurrent scope.
static void	removeLegacyNonScopesFromMapping(Map<ScopeImpl,PvmExecutionImpl> mapping) Remove all entries for legacy non-scopes given that the assigned scope execution is also responsible for another scope
static void	removeLegacySubscriptionOnParent(ExecutionEntity execution, EventSubscriptionEntity eventSubscription) Required for migrating active sequential MI receive tasks.
static void	repairMultiInstanceAsyncJob(ExecutionEntity execution) When executing an async job for an activity wrapped in an miBody, set the execution to the miBody.
static void	repairParentRelationships(Collection<ActivityInstanceImpl> values, String processInstanceId) This is relevant for GetActivityInstanceCmd where in case of legacy multi-instance execution trees, the default algorithm omits multi-instance activity instances.
static boolean	signalCancelBoundaryEvent(String signalName) With prior versions, the boundary event was already executed when compensation was performed; Thus, after compensation completes, the execution is signalled waiting at the boundary event.
protected static <T> boolean	valuesEqual(T value1, T value2)
protected static boolean	wasNoScope(ActivityImpl activity) Determines whether the given scope was a scope (boolean flag isScope) when used as a multi-instance activity

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LegacyBehavior

public LegacyBehavior()

Method Detail

pruneConcurrentScope

public static void pruneConcurrentScope(PvmExecutionImpl execution)

Prunes a concurrent scope. This can only happen if (a) the process instance has been migrated from a previous version to a new version of the process engine This is an inverse operation to #createConcurrentScope(PvmExecutionImpl). See: javadoc of this class for note about concurrent scopes.

Parameters:

execution -

cancelConcurrentScope

public static void cancelConcurrentScope(PvmExecutionImpl execution,
                         PvmActivity cancelledScopeActivity)

Cancels an execution which is both concurrent and scope. This can only happen if (a) the process instance has been migrated from a previous version to a new version of the process engine See: javadoc of this class for note about concurrent scopes.

Parameters:

execution - the concurrent scope execution to destroy

cancellingActivity - the activity that cancels the execution; it must hold that cancellingActivity's event scope is the scope the execution is responsible for

destroyConcurrentScope

public static void destroyConcurrentScope(PvmExecutionImpl execution)

Destroys a concurrent scope Execution. This can only happen if (a) the process instance has been migrated from a previous version to a 7.3+ version of the process engine See: javadoc of this class for note about concurrent scopes.

Parameters:

execution - the execution to destroy

eventSubprocessComplete

public static boolean eventSubprocessComplete(ActivityExecution scopeExecution)

eventSubprocessConcurrentChildExecutionEnded

public static boolean eventSubprocessConcurrentChildExecutionEnded(ActivityExecution scopeExecution,
                                                   ActivityExecution endedExecution)

destroySecondNonScope

public static boolean destroySecondNonScope(PvmExecutionImpl execution)

Destroy an execution for an activity that was previously not a scope and now is (e.g. event subprocess)

isLegacyBehaviorRequired

protected static boolean isLegacyBehaviorRequired(ActivityExecution scopeExecution)

This method

Parameters:

scopeExecution -

isLegacyBehaviorTurnedOff -

Returns:

getScopeExecution

public static PvmExecutionImpl getScopeExecution(ScopeImpl scope,
                                 Map<ScopeImpl,PvmExecutionImpl> activityExecutionMapping)

In case the process instance was migrated from a previous version, activities which are now parsed as scopes do not have scope executions. Use the flow scopes of these activities in order to find their execution. - For an event subprocess this is the scope execution of the scope in which the event subprocess is embeded in - For a multi instance sequential subprocess this is the multi instace scope body.

Parameters:

targetScope -

activityExecutionMapping -

Returns:

ensureConcurrentScope

protected static void ensureConcurrentScope(PvmExecutionImpl execution)

ensureConcurrent

protected static void ensureConcurrent(PvmExecutionImpl execution)

ensureScope

protected static void ensureScope(PvmExecutionImpl execution)

createActivityExecutionMapping

public static Map<ScopeImpl,PvmExecutionImpl> createActivityExecutionMapping(List<PvmExecutionImpl> scopeExecutions,
                                                             List<ScopeImpl> scopes)

Creates an activity execution mapping, when the scope hierarchy and the execution hierarchy are out of sync.

Parameters:

scopeExecutions -

scopes -

Returns:

wasNoScope

protected static boolean wasNoScope(ActivityImpl activity)

Determines whether the given scope was a scope (boolean flag isScope) when used as a multi-instance activity

isLegacyAsyncAtMultiInstance

protected static boolean isLegacyAsyncAtMultiInstance(PvmExecutionImpl execution)

This returns true only if the provided execution has reached its wait state in a legacy engine version, because only in that case, it can be async and waiting at the inner activity wrapped by the miBody. In versions >= 7.3, the execution would reference the multi-instance body instead.

determinePropagatingExecutionOnEnd

public static PvmExecutionImpl determinePropagatingExecutionOnEnd(PvmExecutionImpl propagatingExecution)

Tolerates the broken execution trees fixed with CAM-3727 where there may be more ancestor scope executions than ancestor flow scopes; In that case, the argument execution is removed, the parent execution of the argument is returned such that one level of mismatch is corrected. Note that this does not necessarily skip the correct scope execution, since the broken parent-child relationships may be anywhere in the tree (e.g. consider a non-interrupting boundary event followed by a subprocess (i.e. scope), when the subprocess ends, we would skip the subprocess's execution).

isConcurrentScope

public static boolean isConcurrentScope(PvmExecutionImpl propagatingExecution)

Concurrent + scope executions are legacy and could occur in processes with non-interrupting boundary events or event subprocesses

removeLegacySubscriptionOnParent

public static void removeLegacySubscriptionOnParent(ExecutionEntity execution,
                                    EventSubscriptionEntity eventSubscription)

Required for migrating active sequential MI receive tasks. These activities were formerly not scope, but are now. This has the following implications:

Before migration:

• the event subscription is attached to the miBody scope execution

After migration:

• a new subscription is created for every instance
• the new subscription is attached to a dedicated scope execution as a child of the miBody scope execution

Thus, this method removes the subscription on the miBody scope

areEqualEventSubscriptions

protected static boolean areEqualEventSubscriptions(EventSubscriptionEntity subscription1,
                                 EventSubscriptionEntity subscription2)

Checks if the parameters are the same apart from the execution id

valuesEqual

protected static <T> boolean valuesEqual(T value1,
                      T value2)

removeLegacyNonScopesFromMapping

public static void removeLegacyNonScopesFromMapping(Map<ScopeImpl,PvmExecutionImpl> mapping)

Remove all entries for legacy non-scopes given that the assigned scope execution is also responsible for another scope

repairParentRelationships

public static void repairParentRelationships(Collection<ActivityInstanceImpl> values,
                             String processInstanceId)

This is relevant for GetActivityInstanceCmd where in case of legacy multi-instance execution trees, the default algorithm omits multi-instance activity instances.

migrateMultiInstanceJobDefinitions

public static void migrateMultiInstanceJobDefinitions(ProcessDefinitionEntity processDefinition,
                                      List<JobDefinitionEntity> jobDefinitions)

repairMultiInstanceAsyncJob

public static void repairMultiInstanceAsyncJob(ExecutionEntity execution)

When executing an async job for an activity wrapped in an miBody, set the execution to the miBody. Background: in <= 7.2 async jobs were created for the inner activity, although the semantics are that they are executed before the miBody is entered

signalCancelBoundaryEvent

public static boolean signalCancelBoundaryEvent(String signalName)

With prior versions, the boundary event was already executed when compensation was performed; Thus, after compensation completes, the execution is signalled waiting at the boundary event.

parseCancelBoundaryEvent

public static void parseCancelBoundaryEvent(ActivityImpl activity)

See Also:

signalCancelBoundaryEvent(String)