jbpm工作流发布封装类

public class WorkflowManagerImpl extends HibernateDaoSupport implements
        WorkflowManager {

    private JbpmConfiguration jbpmConfiguration;

    public long addProcessInstance(String workflowName, int documentId) {

        JbpmContext context = getContext();

        //从JBPM中加载流程定义
        ProcessDefinition definition = context.getGraphSession().findLatestProcessDefinition(workflowName);

        ProcessInstance instance = new ProcessInstance(definition);

        //将公文标识绑定到流程实例
        instance.getContextInstance().createVariable("document", documentId);

        //存储流程实例的信息
        context.save(instance);

        return instance.getId();
    }

    public void delProcessInstance(long processInstanceId) {

        JbpmContext context = getContext();

        //删除流程实例
        context.getGraphSession().deleteProcessInstance(processInstanceId);
    }

    public void delWorkflow(int workflowId) {

        //在OA中删除流程的定义
        Workflow workflow = (Workflow)getHibernateTemplate().load(Workflow.class, workflowId);
        getHibernateTemplate().delete(workflow);

        //在JBPM中删除流程定义
        //JBPM对流程定义按版本进行管理，所以在同一个时刻，可能存在同一个流程定义的多个不同的版本
        //如果需要对其删除，则应该删除所有的版本

        //查找对应流程定义的所有版本
        List defs = getContext().getGraphSession().findAllProcessDefinitionVersions(workflow.getName());
        for (Iterator iter = defs.iterator(); iter.hasNext();) {
            ProcessDefinition def = (ProcessDefinition) iter.next();
            getContext().getGraphSession().deleteProcessDefinition(def);
        }
    }

    public void deployProcessDefinition(byte[] processDefinition,
            byte[] processImage) {

        //通过byte[]创建ProcessDefinition对象
        ProcessDefinition def =
            ProcessDefinition.parseXmlInputStream(
                    new ByteArrayInputStream(processDefinition));

        //将流程定义文件部署到JBPM
        getContext().deployProcessDefinition(def);

        //首先查找一下Workflow对象是否已经存在
        Workflow workflow = (Workflow)getSession()
                .createQuery("select w from Workflow w where w.name = ? ")
                .setParameter(0, def.getName())
                .uniqueResult();

        //如果流程尚未存在，则创建
        if(workflow == null){
            workflow = new Workflow();
            workflow.setName(def.getName());
            workflow.setProcessDefinition(processDefinition);
            workflow.setProcessImage(processImage);
            getHibernateTemplate().save(workflow);
            return;
        }

        //如果流程已经存在，则更新
        workflow.setName(def.getName());
        workflow.setProcessDefinition(processDefinition);
        workflow.setProcessImage(processImage);
        getHibernateTemplate().update(workflow);
    }

    public Workflow findWorkflow(int workflowId) {
        return (Workflow)getHibernateTemplate().load(Workflow.class, workflowId);
    }

    public String flowToNextStep(String username, long processInstanceId,
            String transitionName) {

        JbpmContext context = getContext();
        String status = null;

        ProcessInstance instance = context.getProcessInstance(processInstanceId);

        //当前节点
        String currentNodeName = instance.getRootToken().getNode().getName();

        //起始节点
        String startNodeName = instance.getProcessDefinition().getStartState().getName();

        //如果是在起始节点，因为起始节点不会跟任何人相关联（即不会将任务分配给任何人）
        if(currentNodeName.equals(startNodeName)){
            //需要使用流程实例的signal()方法来触发流程向下一步流动！
            instance.getRootToken().signal(transitionName);
        }else{

            //首先找出用户的当前任务
            List tasks = context.getTaskMgmtSession().findTaskInstances(username);
            for (Iterator iter = tasks.iterator(); iter.hasNext();) {
                TaskInstance taskInstance = (TaskInstance) iter.next();
                if(taskInstance.getProcessInstance().getId() == processInstanceId){

                    //这就是当前文档对应的任务，需要结束这个任务，从而触发流程向下一步骤移动！
                    taskInstance.end(transitionName);
                    break;
                }
            }
        }

        //将公文当前所处节点作为状态信息返回
        status = instance.getRootToken().getNode().getName();

        //判断当前的状态是否已经结束！
        if(instance.hasEnded()){
            status = Document.STATUS_END;
        }

        return status;
    }

    public List searchAllWorkflows() {
        return getHibernateTemplate().find("from Workflow");
    }


    public List searchApprovingDocuments(String username) {

        JbpmContext context = getContext();

        List docIds = new ArrayList();

        //首先获得流转到用户的任务列表
        List tasks = context.getTaskMgmtSession().findTaskInstances(username);
        for (Iterator iter = tasks.iterator(); iter.hasNext();) {
            TaskInstance taskInstance = (TaskInstance) iter.next();

            //任务实例是否正在等待审批，如果不是，则忽略（即不应该被列到待审批列表中！）
            if(!taskInstance.isSignalling()){
                continue;
            }

            //根据其对应的流程实例，获得公文标识
            Integer docId = (Integer)taskInstance.getProcessInstance().getContextInstance().getVariable("document");
            docIds.add(docId);
        }

        return docIds;
    }

    //下一步都有哪些流向？
    public List searchNextTransitions(String username,long processInstanceId) {

        JbpmContext context = getContext();

        List transitions = new ArrayList();

        //根据流程实例标识查找流程实例
        ProcessInstance instance = context.getProcessInstance(processInstanceId);

//      //根据流程实例，获得当前的节点，从而得到在当前节点下有哪些流向
//      List nextSteps = instance.getRootToken().getNode().getLeavingTransitions();


        //当前节点
        String currentNodeName = instance.getRootToken().getNode().getName();

        //起始节点
        String startNodeName = instance.getProcessDefinition().getStartState().getName();

        Collection nextSteps = null;
        //如果是在起始节点，因为起始节点不会跟任何人相关联（即不会将任务分配给任何人）
        if(currentNodeName.equals(startNodeName)){
            //需要使用流程实例的signal()方法来触发流程向下一步流动！
            nextSteps = instance.getRootToken().getAvailableTransitions();
        }else{

            //首先找出用户的当前任务
            List tasks = context.getTaskMgmtSession().findTaskInstances(username);
            for (Iterator iter = tasks.iterator(); iter.hasNext();) {
                TaskInstance taskInstance = (TaskInstance) iter.next();
                if(taskInstance.getProcessInstance().getId() == processInstanceId){

                    nextSteps = taskInstance.getAvailableTransitions();
                    break;
                }
            }
        }

        for (Iterator iter = nextSteps.iterator(); iter.hasNext();) {
            Transition transition = (Transition) iter.next();
            transitions.add(transition.getName());
        }

        return transitions;
    }

    /**
     * 获取JbpmContext对象，需要将JbpmContext的session设置为当前的session对象
     * @return
     */
    private JbpmContext getContext(){
        JbpmContext context = jbpmConfiguration.createJbpmContext();
        context.setSession(getSession());
        return context;
    }

    public void setJbpmConfiguration(JbpmConfiguration jbpmConfiguration) {
        this.jbpmConfiguration = jbpmConfiguration;
    }

}