/* Licensed under the Apache License, ersion 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.activiti.engine.impl.pvm.runtime;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.activiti.engine.EngineServices;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.pvm.PvmActivity;
import org.activiti.engine.impl.pvm.PvmException;
import org.activiti.engine.impl.pvm.PvmExecution;
import org.activiti.engine.impl.pvm.PvmProcessDefinition;
import org.activiti.engine.impl.pvm.PvmProcessElement;
import org.activiti.engine.impl.pvm.PvmProcessInstance;
import org.activiti.engine.impl.pvm.PvmTransition;
import org.activiti.engine.impl.pvm.delegate.ActivityExecution;
import org.activiti.engine.impl.pvm.delegate.ExecutionListenerExecution;
import org.activiti.engine.impl.pvm.delegate.SignallableActivityBehavior;
import org.activiti.engine.impl.pvm.process.ActivityImpl;
import org.activiti.engine.impl.pvm.process.ProcessDefinitionImpl;
import org.activiti.engine.impl.pvm.process.TransitionImpl;
/**
* @author Tom Baeyens
* @author Joram Barrez
* @author Daniel Meyer
* @author Falko Menge
*/
public class ExecutionImpl implements
Serializable,
ActivityExecution,
ExecutionListenerExecution,
PvmExecution,
InterpretableExecution {
private static final long serialVersionUID = 1L;
private static Logger log = Logger.getLogger(ExecutionImpl.class.getName());
// current position /////////////////////////////////////////////////////////
protected ProcessDefinitionImpl processDefinition;
/** current activity */
protected ActivityImpl activity;
/** current transition. is null when there is no transition being taken. */
protected TransitionImpl transition = null;
/** the process instance. this is the root of the execution tree.
* the processInstance of a process instance is a self reference. */
protected ExecutionImpl processInstance;
/** the parent execution */
protected ExecutionImpl parent;
/** nested executions representing scopes or concurrent paths */
protected List<ExecutionImpl> executions;
/** super execution, not-null if this execution is part of a subprocess */
protected ExecutionImpl superExecution;
/** reference to a subprocessinstance, not-null if currently subprocess is started from this execution */
protected ExecutionImpl subProcessInstance;
/** only available until the process instance is started */
protected StartingExecution startingExecution;
// state/type of execution //////////////////////////////////////////////////
/** indicates if this execution represents an active path of execution.
* Executions are made inactive in the following situations:
* <ul>
* <li>an execution enters a nested scope</li>
* <li>an execution is split up into multiple concurrent executions, then the parent is made inactive.</li>
* <li>an execution has arrived in a parallel gateway or join and that join has not yet activated/fired.</li>
* <li>an execution is ended.</li>
* </ul>*/
protected boolean isActive = true;
protected boolean isScope = true;
protected boolean isConcurrent = false;
protected boolean isEnded = false;
protected boolean isEventScope = false;
protected Map<String, Object> variables = null;
// events ///////////////////////////////////////////////////////////////////
protected String eventName;
protected PvmProcessElement eventSource;
protected int executionListenerIndex = 0;
// cascade deletion ////////////////////////////////////////////////////////
protected boolean deleteRoot;
protected String deleteReason;
// replaced by //////////////////////////////////////////////////////////////
/** when execution structure is pruned during a takeAll, then
* the original execution has to be resolved to the replaced execution.
* @see {@link #takeAll(List, List)} {@link OutgoingExecution} */
protected ExecutionImpl replacedBy;
// atomic operations ////////////////////////////////////////////////////////
/** next operation. process execution is in fact runtime interpretation of the process model.
* each operation is a logical unit of interpretation of the process. so sequentially processing
* the operations drives the interpretation or execution of a process.
* @see AtomicOperation
* @see #performOperation(AtomicOperation) */
protected AtomicOperation nextOperation;
protected boolean isOperating = false;
/* Default constructor for ibatis/jpa/etc. */
public ExecutionImpl() {
}
public ExecutionImpl(ActivityImpl initial) {
startingExecution = new StartingExecution(initial);
}
// lifecycle methods ////////////////////////////////////////////////////////
/** creates a new execution. properties processDefinition, processInstance and activity will be initialized. */
public ExecutionImpl createExecution() {
// create the new child execution
ExecutionImpl createdExecution = newExecution();
// manage the bidirectional parent-child relation
ensureExecutionsInitialized();
executions.add(createdExecution);
createdExecution.setParent(this);
// initialize the new execution
createdExecution.setProcessDefinition(getProcessDefinition());
createdExecution.setProcessInstance(getProcessInstance());
createdExecution.setActivity(getActivity());
return createdExecution;
}
/** instantiates a new execution. can be overridden by subclasses */
protected ExecutionImpl newExecution() {
return new ExecutionImpl();
}
public PvmProcessInstance createSubProcessInstance(PvmProcessDefinition processDefinition) {
ExecutionImpl subProcessInstance = newExecution();
// manage bidirectional super-subprocess relation
subProcessInstance.setSuperExecution(this);
this.setSubProcessInstance(subProcessInstance);
// Initialize the new execution
subProcessInstance.setProcessDefinition((ProcessDefinitionImpl) processDefinition);
subProcessInstance.setProcessInstance(subProcessInstance);
return subProcessInstance;
}
public void initialize() {
}
public void destroy() {
setScope(false);
}
public void remove() {
ensureParentInitialized();
if (parent!=null) {
parent.ensureExecutionsInitialized();
parent.executions.remove(this);
}
// remove event scopes:
List<InterpretableExecution> childExecutions = new ArrayList<InterpretableExecution>(getExecutions());
for (InterpretableExecution childExecution : childExecutions) {
if(childExecution.isEventScope()) {
log.fine("removing eventScope "+childExecution);
childExecution.destroy();
childExecution.remove();
}
}
}
public void destroyScope(String reason) {
if(log.isLoggable(Level.FINE)) {
log.fine("performing destroy scope behavior for execution "+this);
}
// remove all child executions and sub process instances:
List<InterpretableExecution> executions = new ArrayList<InterpretableExecution>(getExecutions());
for (InterpretableExecution childExecution : executions) {
if (childExecution.getSubProcessInstance()!=null) {
childExecution.getSubProcessInstance().deleteCascade(reason);
}
childExecution.deleteCascade(reason);
}
}
// parent ///////////////////////////////////////////////////////////////////
/** ensures initialization and returns the parent */
public ExecutionImpl getParent() {
ensureParentInitialized();
return parent;
}
public String getParentId() {
ensureActivityInitialized();
if(parent != null) {
return parent.getId();
}
return null;
}
/** all updates need to go through this setter as subclasses can override this method */
public void setParent(InterpretableExecution parent) {
this.parent = (ExecutionImpl) parent;
}
/** must be called before memberfield parent is used.
* can be used by subclasses to provide parent member field initialization. */
protected void ensureParentInitialized() {
}
// executions ///////////////////////////////////////////////////////////////
/** ensures initialization and returns the non-null executions list */
public List<ExecutionImpl> getExecutions() {
ensureExecutionsInitialized();
return executions;
}
public ExecutionImpl getSuperExecution() {
ensureSuperExecutionInitialized();
return superExecution;
}
public void setSuperExecution(ExecutionImpl superExecution) {
this.superExecution = superExecution;
if (superExecution != null) {
superExecution.setSubProcessInstance(null);
}
}
// Meant to be overridden by persistent subclasseses
protected void ensureSuperExecutionInitialized() {
}
public ExecutionImpl getSubProcessInstance() {
ensureSubProcessInstanceInitialized();
return subProcessInstance;
}
public void setSubProcessInstance(InterpretableExecution subProcessInstance) {
this.subProcessInstance = (ExecutionImpl) subProcessInstance;
}
// Meant to be overridden by persistent subclasses
protected void ensureSubProcessInstanceInitialized() {
}
public void deleteCascade(String deleteReason) {
this.deleteReason = deleteReason;
this.deleteRoot = true;
performOperation(AtomicOperation.DELETE_CASCADE);
}
/** removes an execution. if there are nested executions, those will be ended recursively.
* if there is a parent, this method removes the bidirectional relation
* between parent and this execution. */
public void end() {
isActive = false;
isEnded = true;
performOperation(AtomicOperation.ACTIVITY_END);
}
/** searches for an execution positioned in the given activity */
public ExecutionImpl findExecution(String activityId) {
if ( (getActivity()!=null)
&& (getActivity().getId().equals(activityId))
) {
return this;
}
for (ExecutionImpl nestedExecution : getExecutions()) {
ExecutionImpl result = nestedExecution.findExecution(activityId);
if (result != null) {
return result;
}
}
return null;
}
public List<String> findActiveActivityIds() {
List<String> activeActivityIds = new ArrayList<String>();
collectActiveActivityIds(activeActivityIds);
return activeActivityIds;
}
protected void collectActiveActivityIds(List<String> activeActivityIds) {
ensureActivityInitialized();
if (isActive && activity!=null) {
activeActivityIds.add(activity.getId());
}
ensureExecutionsInitialized();
for (ExecutionImpl execution: executions) {
execution.collectActiveActivityIds(activeActivityIds);
}
}
/** must be called before memberfield executions is used.
* can be used by subclasses to provide executions member field initialization. */
protected void ensureExecutionsInitialized() {
if (executions==null) {
executions = new ArrayList<ExecutionImpl>();
}
}
// process definition ///////////////////////////////////////////////////////
/** ensures initialization and returns the process definition. */
public ProcessDefinitionImpl getProcessDefinition() {
ensureProcessDefinitionInitialized();
return processDefinition;
}
public String getProcessDefinitionId() {
return getProcessDefinition().getId();
}
/** for setting the process definition, this setter must be used as subclasses can override */
/** must be called before memberfield processDefinition is used.
* can be used by subclasses to provide processDefinition member field initialization. */
protected void ensureProcessDefinitionInitialized() {
}
// process instance /////////////////////////////////////////////////////////
/** ensures initialization and returns the process instance. */
public ExecutionImpl getProcessInstance() {
ensureProcessInstanceInitialized();
return processInstance;
}
public String getProcessInstanceId() {
return getProcessInstance().getId();
}
public String getBusinessKey() {
return getProcessInstance().getBusinessKey();
}
public String getProcessBusinessKey() {
return getProcessInstance().getBusinessKey();
}
/** for setting the process instance, this setter must be used as subclasses can override */
public void setProcessInstance(InterpretableExecution processInstance) {
this.processInstance = (ExecutionImpl) processInstance;
}
/** must be called before memberfield processInstance is used.
* can be used by subclasses to provide processInstance member field initialization. */
protected void ensureProcessInstanceInitialized() {
}
// activity /////////////////////////////////////////////////////////////////
/** ensures initialization and returns the activity */
public ActivityImpl getActivity() {
ensureActivityInitialized();
return activity;
}
/** sets the current activity. can be overridden by subclasses. doesn't
* require initialization. */
public void setActivity(ActivityImpl activity) {
this.activity = activity;
}
/** must be called before the activity member field or getActivity() is called */
protected void ensureActivityInitialized() {
}
// scopes ///////////////////////////////////////////////////////////////////
protected void ensureScopeInitialized() {
}
public boolean isScope() {
return isScope;
}
public void setScope(boolean isScope) {
this.isScope = isScope;
}
// process instance start implementation ////////////////////////////////////
public void start() {
if(startingExecution == null && isProcessInstance()) {
startingExecution = new StartingExecution(processDefinition.getInitial());
}
performOperation(AtomicOperation.PROCESS_START);
}
// methods that translate to operations /////////////////////////////////////
public void signal(String signalName, Object signalData) {
ensureActivityInitialized();
SignallableActivityBehavior activityBehavior = (SignallableActivityBehavior) activity.getActivityBehavior();
try {
activityBehavior.signal(this, signalName, signalData);
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new PvmException("couldn't process signal '"+signalName+"' on activity '"+activity.getId()+"': "+e.getMessage(), e);
}
}
public void take(PvmTransition transition) {
if (this.transition!=null) {
throw new PvmException("already taking a transition");
}
if (transition==null) {
throw new PvmException("transition is null");
}
setTransition((TransitionImpl) transition);
performOperation(AtomicOperation.TRANSITION_NOTIFY_LISTENER_END);
}
public void executeActivity(PvmActivity activity) {
setActivity((ActivityImpl) activity);
performOperation(AtomicOperation.ACTIVITY_START);
}
public List<ActivityExecution> findInactiveConcurrentExecutions(PvmActivity activity) {
List<ActivityExecution> inactiveConcurrentExecutionsInActivity = new ArrayList<ActivityExecution>();
List<ActivityExecution> otherConcurrentExecutions = new ArrayList<ActivityExecution>();
if (isConcurrent()) {
List< ? extends ActivityExecution> concurrentExecutions = getParent().getExecutions();
for (ActivityExecution concurrentExecution: concurrentExecutions) {
if (concurrentExecution.getActivity()==activity) {
if (concurrentExecution.isActive()) {
throw new PvmException("didn't expect active execution in "+activity+". bug?");
}
inactiveConcurrentExecutionsInActivity.add(concurrentExecution);
} else {
otherConcurrentExecutions.add(concurrentExecution);
}
}
} else {
if (!isActive()) {
inactiveConcurrentExecutionsInActivity.add(this);
} else {
otherConcurrentExecutions.add(this);
}
}
if (log.isLoggable(Level.FINE)) {
log.fine("inactive concurrent executions in '"+activity+"': "+inactiveConcurrentExecutionsInActivity);
log.fine("other concurrent executions: "+otherConcurrentExecutions);
}
return inactiveConcurrentExecutionsInActivity;
}
@SuppressWarnings("unchecked")
public void takeAll(List<PvmTransition> transitions, List<ActivityExecution> recyclableExecutions) {
transitions = new ArrayList<PvmTransition>(transitions);
recyclableExecutions = (recyclableExecutions!=null ? new ArrayList<ActivityExecution>(recyclableExecutions) : new ArrayList<ActivityExecution>());
if (recyclableExecutions.size()>1) {
for (ActivityExecution recyclableExecution: recyclableExecutions) {
if (((ExecutionImpl)recyclableExecution).isScope()) {
throw new PvmException("joining scope executions is not allowed");
}
}
}
ExecutionImpl concurrentRoot = ((isConcurrent && !isScope) ? getParent() : this);
List<ExecutionImpl> concurrentActiveExecutions = new ArrayList<ExecutionImpl>();
for (ExecutionImpl execution: concurrentRoot.getExecutions()) {
if (execution.isActive()) {
concurrentActiveExecutions.add(execution);
}
}
if (log.isLoggable(Level.FINE)) {
log.fine("transitions to take concurrent: " + transitions);
log.fine("active concurrent executions: " + concurrentActiveExecutions);
}
if ( (transitions.size()==1)
&& (concurrentActiveExecutions.isEmpty())
) {
List<ExecutionImpl> recyclableExecutionImpls = (List) recyclableExecutions;
for (ExecutionImpl prunedExecution: recyclableExecutionImpls) {
// End the pruned executions if necessary.
// Some recyclable executions are inactivated (joined executions)
// Others are already ended (end activities)
if (!prunedExecution.isEnded()) {
log.fine("pruning execution " + prunedExecution);
prunedExecution.remove();
}
}
log.fine("activating the concurrent root "+concurrentRoot+" as the single path of execution going forward");
concurrentRoot.setActive(true);
concurrentRoot.setActivity(activity);
concurrentRoot.setConcurrent(false);
concurrentRoot.take(transitions.get(0));
} else {
List<OutgoingExecution> outgoingExecutions = new ArrayList<OutgoingExecution>();
recyclableExecutions.remove(concurrentRoot);
log.fine("recyclable executions for reused: " + recyclableExecutions);
// first create the concurrent executions
while (!transitions.isEmpty()) {
PvmTransition outgoingTransition = transitions.remove(0);
ExecutionImpl outgoingExecution = null;
if (recyclableExecutions.isEmpty()) {
outgoingExecution = concurrentRoot.createExecution();
log.fine("new "+outgoingExecution+" created to take transition "+outgoingTransition);
} else {
outgoingExecution = (ExecutionImpl) recyclableExecutions.remove(0);
log.fine("recycled "+outgoingExecution+" to take transition "+outgoingTransition);
}
outgoingExecution.setActive(true);
outgoingExecution.setScope(false);
outgoingExecution.setConcurrent(true);
outgoingExecutions.add(new OutgoingExecution(outgoingExecution, outgoingTransition, true));
}
// prune the executions that are not recycled
for (ActivityExecution prunedExecution: recyclableExecutions) {
log.fine("pruning execution "+prunedExecution);
prunedExecution.end();
}
// then launch all the concurrent executions
for (OutgoingExecution outgoingExecution: outgoingExecutions) {
outgoingExecution.take();
}
}
}
public void performOperation(AtomicOperation executionOperation) {
this.nextOperation = executionOperation;
if (!isOperating) {
isOperating = true;
while (nextOperation!=null) {
AtomicOperation currentOperation = this.nextOperation;
this.nextOperation = null;
if (log.isLoggable(Level.FINEST)) {
log.finest("AtomicOperation: " + currentOperation + " on " + this);
}
currentOperation.execute(this);
}
isOperating = false;
}
}
public boolean isActive(String activityId) {
return findExecution(activityId)!=null;
}
// variables ////////////////////////////////////////////////////////////////
public Object getVariable(String variableName) {
ensureVariablesInitialized();
// If value is found in this scope, return it
if (variables.containsKey(variableName)) {
return variables.get(variableName);
}
// If value not found in this scope, check the parent scope
ensureParentInitialized();
if (parent != null) {
return parent.getVariable(variableName);
}
// Variable is nowhere to be found
return null;
}
public Map<String, Object> getVariables() {
Map<String, Object> collectedVariables = new HashMap<String, Object>();
collectVariables(collectedVariables);
return collectedVariables;
}
protected void collectVariables(Map<String, Object> collectedVariables) {
ensureParentInitialized();
if (parent!=null) {
parent.collectVariables(collectedVariables);
}
ensureVariablesInitialized();
for (String variableName: variables.keySet()) {
collectedVariables.put(variableName, variables.get(variableName));
}
}
public void setVariables(Map<String, ? extends Object> variables) {
ensureVariablesInitialized();
if (variables!=null) {
for (String variableName: variables.keySet()) {
setVariable(variableName, variables.get(variableName));
}
}
}
public void setVariable(String variableName, Object value) {
ensureVariablesInitialized();
if (variables.containsKey(variableName)) {
setVariableLocally(variableName, value);
} else {
ensureParentInitialized();
if (parent!=null) {
parent.setVariable(variableName, value);
} else {
setVariableLocally(variableName, value);
}
}
}
public void setVariableLocally(String variableName, Object value) {
log.fine("setting variable '"+variableName+"' to value '"+value+"' on "+this);
variables.put(variableName, value);
}
public boolean hasVariable(String variableName) {
ensureVariablesInitialized();
if (variables.containsKey(variableName)) {
return true;
}
ensureParentInitialized();
if (parent!=null) {
return parent.hasVariable(variableName);
}
return false;
}
protected void ensureVariablesInitialized() {
if (variables==null) {
variables = new HashMap<String, Object>();
}
}
// process engine convience access /////////////////////////////////////////////////////////////////
public EngineServices getEngineServices() {
return Context.getProcessEngineConfiguration();
}
// toString /////////////////////////////////////////////////////////////////
public String toString() {
if (isProcessInstance()) {
return "ProcessInstance["+getToStringIdentity()+"]";
} else {
return (isEventScope? "EventScope":"")+(isConcurrent? "Concurrent" : "")+(isScope() ? "Scope" : "")+"Execution["+getToStringIdentity()+"]";
}
}
protected String getToStringIdentity() {
return Integer.toString(System.identityHashCode(this));
}
// customized getters and setters ///////////////////////////////////////////
public boolean isProcessInstance() {
ensureParentInitialized();
return parent==null;
}
public void inactivate() {
this.isActive = false;
}
// allow for subclasses to expose a real id /////////////////////////////////
public String getId() {
return null;
}
// getters and setters //////////////////////////////////////////////////////
public TransitionImpl getTransition() {
return transition;
}
public void setTransition(TransitionImpl transition) {
this.transition = transition;
}
public Integer getExecutionListenerIndex() {
return executionListenerIndex;
}
public void setExecutionListenerIndex(Integer executionListenerIndex) {
this.executionListenerIndex = executionListenerIndex;
}
public boolean isConcurrent() {
return isConcurrent;
}
public void setConcurrent(boolean isConcurrent) {
this.isConcurrent = isConcurrent;
}
public boolean isActive() {
return isActive;
}
public void setActive(boolean isActive) {
this.isActive = isActive;
}
public boolean isEnded() {
return isEnded;
}
public void setProcessDefinition(ProcessDefinitionImpl processDefinition) {
this.processDefinition = processDefinition;
}
public String getEventName() {
return eventName;
}
public void setEventName(String eventName) {
this.eventName = eventName;
}
public PvmProcessElement getEventSource() {
return eventSource;
}
public void setEventSource(PvmProcessElement eventSource) {
this.eventSource = eventSource;
}
public String getDeleteReason() {
return deleteReason;
}
public void setDeleteReason(String deleteReason) {
this.deleteReason = deleteReason;
}
public ExecutionImpl getReplacedBy() {
return replacedBy;
}
public void setReplacedBy(InterpretableExecution replacedBy) {
this.replacedBy = (ExecutionImpl) replacedBy;
}
public void setExecutions(List<ExecutionImpl> executions) {
this.executions = executions;
}
public boolean isDeleteRoot() {
return deleteRoot;
}
public String getCurrentActivityId() {
String currentActivityId = null;
if (this.activity != null) {
currentActivityId = activity.getId();
}
return currentActivityId;
}
public String getCurrentActivityName() {
String currentActivityName = null;
if (this.activity != null) {
currentActivityName = (String) activity.getProperty("name");
}
return currentActivityName;
}
public void createVariableLocal(String variableName, Object value) {
}
public void createVariablesLocal(Map<String, ? extends Object> variables) {
}
public Object getVariableLocal(Object variableName) {
return null;
}
public Set<String> getVariableNames() {
return null;
}
public Set<String> getVariableNamesLocal() {
return null;
}
public Map<String, Object> getVariablesLocal() {
return null;
}
public boolean hasVariableLocal(String variableName) {
return false;
}
public boolean hasVariables() {
return false;
}
public boolean hasVariablesLocal() {
return false;
}
public void removeVariable(String variableName) {
}
public void removeVariableLocal(String variableName) {
}
public void removeVariables(Collection<String> variableNames) {
}
public void removeVariablesLocal(Collection<String> variableNames) {
}
public void removeVariables() {
}
public void removeVariablesLocal() {
}
public void deleteVariablesLocal() {
}
public Object setVariableLocal(String variableName, Object value) {
return null;
}
public void setVariablesLocal(Map<String, ? extends Object> variables) {
}
public boolean isEventScope() {
return isEventScope;
}
public void setEventScope(boolean isEventScope) {
this.isEventScope = isEventScope;
}
public StartingExecution getStartingExecution() {
return startingExecution;
}
public void disposeStartingExecution() {
startingExecution = null;
}
}