/* 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.activiti.cdi;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import javax.enterprise.context.Conversation;
import javax.enterprise.context.RequestScoped;
import javax.enterprise.inject.Instance;
import javax.inject.Inject;
import javax.inject.Named;
import org.activiti.cdi.annotation.BusinessProcessScoped;
import org.activiti.cdi.impl.context.ContextAssociationManager;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.repository.ProcessDefinition;
import org.activiti.engine.runtime.Execution;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;
/**
* Bean supporting contextual business process management. This allows us to
* implement a unit of work, in which a particular CDI scope (Conversation /
* Request / Thread) is associated with a particular Execution / ProcessInstance
* or Task.
* <p />
* The protocol is that we <em>associate</em> the {@link BusinessProcess} bean
* with a particular Execution / Task, then perform some changes (retrieve / set process
* variables) and then end the unit of work. This bean makes sure that our changes are
* only "flushed" to the process engine when we successfully complete the unit of work.
* <p />
* A typical usage scenario might look like this:<br />
* <strong>1st unit of work ("process instantiation"):</strong>
* <pre>
* conversation.begin();
* ...
* businessProcess.setVariable("billingId", "1"); // setting variables before starting the process
* businessProcess.startProcessByKey("billingProcess");
* conversation.end();
* </pre>
* <strong>2nd unit of work ("perform a user task"):</strong>
* <pre>
* conversation.begin();
* businessProcess.startTask(id); // now we have associated a task with the current conversation
* ... // this allows us to retrieve and change process variables
* // and @BusinessProcessScoped beans
* businessProcess.setVariable("billingDetails", "someValue"); // these changes are cached in the conversation
* ...
* businessProcess.completeTask(); // now all changed process variables are flushed
* conversation.end();
* </pre>
* <p />
* <strong>NOTE:</strong> in the absence of a conversation, (non faces request, i.e. when processing a JAX-RS,
* JAX-WS, JMS, remote EJB or plain Servlet requests), the {@link BusinessProcess} bean associates with the
* current Request (see {@link RequestScoped @RequestScoped}).
* <p />
* <strong>NOTE:</strong> in the absence of a request, ie. when the activiti JobExecutor accesses
* {@link BusinessProcessScoped @BusinessProcessScoped} beans, the execution is associated with the
* current thread.
*
* @author Daniel Meyer
* @author Falko Menge
*/
@Named
public class BusinessProcess implements Serializable {
private static final long serialVersionUID = 1L;
@Inject private ProcessEngine processEngine;
@Inject private ContextAssociationManager associationManager;
@Inject private Instance<Conversation> conversationInstance;
protected void validateValidUsage() {
if(Context.getCommandContext() != null) {
throw new ActivitiCdiException("Cannot use this method of the BusinessProcess bean within an activiti command.");
}
}
public ProcessInstance startProcessById(String processDefinitionId) {
validateValidUsage();
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceById(processDefinitionId, getAndClearCachedVariables());
setExecution(instance);
return instance;
}
public ProcessInstance startProcessById(String processDefinitionId, String businessKey) {
validateValidUsage();
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceById(processDefinitionId, businessKey, getAndClearCachedVariables());
setExecution(instance);
return instance;
}
public ProcessInstance startProcessById(String processDefinitionId, Map<String, Object> variables) {
validateValidUsage();
Map<String, Object> cachedVariables = getAndClearCachedVariables();
cachedVariables.putAll(variables);
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceById(processDefinitionId, cachedVariables);
setExecution(instance);
return instance;
}
public ProcessInstance startProcessById(String processDefinitionId, String businessKey, Map<String, Object> variables) {
validateValidUsage();
Map<String, Object> cachedVariables = getAndClearCachedVariables();
cachedVariables.putAll(variables);
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceById(processDefinitionId, businessKey, cachedVariables);
setExecution(instance);
return instance;
}
public ProcessInstance startProcessByKey(String key) {
validateValidUsage();
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceByKey(key, getAndClearCachedVariables());
setExecution(instance);
return instance;
}
public ProcessInstance startProcessByKey(String key, String businessKey) {
validateValidUsage();
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceByKey(key, businessKey, getAndClearCachedVariables());
setExecution(instance);
return instance;
}
public ProcessInstance startProcessByKey(String key, Map<String, Object> variables) {
validateValidUsage();
Map<String, Object> cachedVariables = getAndClearCachedVariables();
cachedVariables.putAll(variables);
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceByKey(key, cachedVariables);
setExecution(instance);
return instance;
}
public ProcessInstance startProcessByKey(String key, String businessKey, Map<String, Object> variables) {
validateValidUsage();
Map<String, Object> cachedVariables = getAndClearCachedVariables();
cachedVariables.putAll(variables);
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceByKey(key, businessKey, cachedVariables);
setExecution(instance);
return instance;
}
public ProcessInstance startProcessByMessage(String messageName) {
validateValidUsage();
Map<String, Object> cachedVariables = getAndClearCachedVariables();
ProcessInstance processInstance = processEngine.getRuntimeService().startProcessInstanceByMessage(messageName, cachedVariables);
setExecution(processInstance);
return processInstance;
}
public ProcessInstance startProcessByMessage(String messageName, Map<String, Object> processVariables) {
validateValidUsage();
Map<String, Object> cachedVariables = getAndClearCachedVariables();
cachedVariables.putAll(processVariables);
ProcessInstance processInstance = processEngine.getRuntimeService().startProcessInstanceByMessage(messageName, cachedVariables);
setExecution(processInstance);
return processInstance;
}
public ProcessInstance startProcessByMessage(String messageName, String businessKey, Map<String, Object> processVariables) {
validateValidUsage();
Map<String, Object> cachedVariables = getAndClearCachedVariables();
cachedVariables.putAll(processVariables);
ProcessInstance processInstance = processEngine.getRuntimeService().startProcessInstanceByMessage(messageName, businessKey, cachedVariables);
setExecution(processInstance);
return processInstance;
}
@Deprecated
public ProcessInstance startProcessByName(String string) {
if(Context.getCommandContext() != null) {
throw new ActivitiCdiException("Cannot use startProcessByName in an activiti command.");
}
ProcessDefinition definition = processEngine.getRepositoryService().createProcessDefinitionQuery().processDefinitionName(string).singleResult();
if (definition == null) {
throw new ActivitiException("No process definition found for name: " + string);
}
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceById(definition.getId(), getAndClearCachedVariables());
setExecution(instance);
return instance;
}
@Deprecated
public ProcessInstance startProcessByName(String string, Map<String, Object> variables) {
if(Context.getCommandContext() != null) {
throw new ActivitiCdiException("Cannot use startProcessByName in an activiti command.");
}
ProcessDefinition definition = processEngine.getRepositoryService().createProcessDefinitionQuery().processDefinitionName(string).singleResult();
if (definition == null) {
throw new ActivitiException("No process definition found for name: " + string);
}
Map<String, Object> cachedVariables = getAndClearCachedVariables();
cachedVariables.putAll(variables);
ProcessInstance instance = processEngine.getRuntimeService().startProcessInstanceById(definition.getId(), cachedVariables);
setExecution(instance);
return instance;
}
/**
* Associate with the provided execution. This starts a unit of work.
*
* @param executionId
* the id of the execution to associate with.
* @throw ActivitiCdiException
* if no such execution exists
*/
public void associateExecutionById(String executionId) {
Execution execution = processEngine.getRuntimeService()
.createExecutionQuery()
.executionId(executionId)
.singleResult();
if(execution == null) {
throw new ActivitiCdiException("Cannot associate execution by id: no execution with id '"+executionId+"' found.");
}
associationManager.setExecution(execution);
}
/**
* returns true if an {@link Execution} is associated.
*
* @see #associateExecutionById(String)
*/
public boolean isAssociated() {
return associationManager.getExecutionId() != null;
}
/**
* Signals the current execution, see {@link RuntimeService#signal(String)}
* <p/>
* Ends the current unit of work (flushes changes to process variables set
* using {@link #setVariable(String, Object)} or made on
* {@link BusinessProcessScoped @BusinessProcessScoped} beans).
*
* @throws ActivitiCdiException
* if no execution is currently associated
* @throws ActivitiException
* if the activiti command fails
*/
public void signalExecution() {
assertAssociated();
processEngine.getRuntimeService().signal(associationManager.getExecutionId(), getAndClearCachedVariables());
associationManager.disAssociate();
}
/**
* @see #signalExecution()
*
* In addition, this method allows to end the current conversation
*/
public void signalExecution(boolean endConversation) {
signalExecution();
if(endConversation) {
conversationInstance.get().end();
}
}
// -------------------------------------
/**
* Associates the task with the provided taskId with the current conversation.
* <p/>
*
* @param taskId
* the id of the task
*
* @return the resumed task
*
* @throws ActivitiCdiException
* if no such task is found
*/
public Task startTask(String taskId) {
Task currentTask = associationManager.getTask();
if(currentTask != null && currentTask.getId().equals(taskId)) {
return currentTask;
}
Task task = processEngine.getTaskService().createTaskQuery().taskId(taskId).singleResult();
if(task == null) {
throw new ActivitiCdiException("Cannot resume task with id '"+taskId+"', no such task.");
}
associationManager.setTask(task);
associateExecutionById(task.getExecutionId());
return task;
}
/**
* @see #startTask(String)
*
* this method allows to start a conversation if no conversation is active
*/
public Task startTask(String taskId, boolean beginConversation) {
if(beginConversation) {
Conversation conversation = conversationInstance.get();
if(conversation.isTransient()) {
conversation.begin();
}
}
return startTask(taskId);
}
/**
* Completes the current UserTask, see {@link TaskService#complete(String)}
* <p/>
* Ends the current unit of work (flushes changes to process variables set
* using {@link #setVariable(String, Object)} or made on
* {@link BusinessProcessScoped @BusinessProcessScoped} beans).
*
* @throws ActivitiCdiException
* if no task is currently associated
* @throws ActivitiException
* if the activiti command fails
*/
public void completeTask() {
assertTaskAssociated();
processEngine.getTaskService().complete(getTask().getId(), getAndClearCachedVariables());
associationManager.disAssociate();
}
/**
* @see BusinessProcess#completeTask()
*
* In addition this allows to end the current conversation.
*
*/
public void completeTask(boolean endConversation) {
completeTask();
if(endConversation) {
conversationInstance.get().end();
}
}
public boolean isTaskAssociated() {
return associationManager.getTask() != null;
}
// -------------------------------------------------
/**
* @param variableName
* the name of the process variable for which the value is to be
* retrieved
* @return the value of the provided process variable or 'null' if no such
* variable is set
*/
@SuppressWarnings("unchecked")
public <T> T getVariable(String variableName) {
Object variable = associationManager.getVariable(variableName);
if(variable == null) {
return null;
} else {
return (T)variable;
}
}
/**
* Set a value for a process variable.
* <p />
*
* <strong>NOTE:</strong> If no execution is currently associated,
* the value is temporarily cached and flushed to the process instance
* at the end of the unit of work
*
* @param variableName
* the name of the process variable for which a value is to be set
* @param value
* the value to be set
*
*/
public void setVariable(String variableName, Object value) {
associationManager.setVariable(variableName, value);
}
// ----------------------------------- Getters / Setters
/*
* Note that Producers should go into {@link CurrentProcessInstance} in
* order to allow for specializing {@link BusinessProcess}.
*/
/**
* @see #startTask(String)
*/
public void setTask(Task task) {
startTask(task.getId());
}
/**
* @see #startTask(String)
*/
public void setTaskId(String taskId) {
startTask(taskId);
}
/**
* @see #associateExecutionById(String)
*/
public void setExecution(Execution execution) {
associateExecutionById(execution.getId());
}
/**
* @see #associateExecutionById(String)
*/
protected void setExecutionId(String executionId) {
associateExecutionById(executionId);
}
/**
* Returns the id of the currently associated process instance or 'null'
*/
public String getProcessInstanceId() {
Execution execution = associationManager.getExecution();
return execution != null ? execution.getProcessInstanceId() : null;
}
/**
* Returns the id of the task associated with the current conversation or 'null'.
*/
public String getTaskId() {
Task task = getTask();
return task != null ? task.getId() : null;
}
/**
* Returns the currently associated {@link Task} or 'null'
*
* @throws ActivitiCdiException
* if no {@link Task} is associated. Use {@link #isTaskAssociated()}
* to check whether an association exists.
*
*/
public Task getTask() {
return associationManager.getTask();
}
/**
* Returns the currently associated execution or 'null'
*/
public Execution getExecution() {
return associationManager.getExecution();
}
/**
* @see #getExecution()
*/
public String getExecutionId() {
Execution e = getExecution();
return e != null ? e.getId() : null;
}
/**
* Returns the {@link ProcessInstance} currently associated or 'null'
*
* @throws ActivitiCdiException
* if no {@link Execution} is associated. Use
* {@link #isAssociated()} to check whether an association exists.
*/
public ProcessInstance getProcessInstance() {
Execution execution = getExecution();
if(execution != null && !(execution.getProcessInstanceId().equals(execution.getId()))){
return processEngine
.getRuntimeService()
.createProcessInstanceQuery()
.processInstanceId(execution.getProcessInstanceId())
.singleResult();
}
return (ProcessInstance) execution;
}
// internal implementation //////////////////////////////////////////////////////////
protected void assertAssociated() {
if (associationManager.getExecution() == null) {
throw new ActivitiCdiException("No execution associated. Call busniessProcess.associateExecutionById() or businessProcess.startTask() first.");
}
}
protected void assertTaskAssociated() {
if (associationManager.getTask() == null) {
throw new ActivitiCdiException("No task associated. Call businessProcess.startTask() first.");
}
}
protected Map<String, Object> getCachedVariables() {
return associationManager.getCachedVariables();
}
protected Map<String, Object> getAndClearCachedVariables() {
Map<String, Object> beanStore = getCachedVariables();
Map<String, Object> copy = new HashMap<String, Object>(beanStore);
beanStore.clear();
return copy;
}
}