前面已经介绍了办理人设置和表单字段权限的原理，下面再看看iMatrix平台是怎样处理事件的？
流程属性中的业务补偿：
自己认为业务补偿也是属于事件的。
1 xml中的配置
<process … … … …>
… … … …
<extend>
… … … …
<expiation-setting>
<set-type>http</set-type>
<delete-instance>
/expense-report/delete-instance-expiation.htm
</delete-instance>
<cancel-instance>
/expense-report/cancel-instance-expiation.htm
</cancel-instance>
<task-jump>/expense-report/task-jump-expiation.htm</task-jump>
<pause-instance/>
<continue-instance/>
<goback-task/>
</expiation-setting>
</extend>
… … … …
</process>
任务退回配置的是spring bean名称，该bean需要实现的接口为com.norteksoft.wf.engine.client. ReturnTaskInterface。当在流程监控中删除、取消、暂停、继续实例时，做法基本一致，如下：
首先获得xml中配置的请求方式和请求的url；当请求方式是HTTP方式时，使用httpclient请求url；当请求方式是RESTful方式时，使用的是Jersey的Client请求的。
WebUtil.java中的两种请求方式实现如下：
/**
* 普通的http请求
* @param url
*/
publicstaticvoid getHttpConnection(String url,Long companyId,Long entityId,String systemCode){
String resultUrl=SystemUrls.getBusinessPath(systemCode);
if(PropUtils.isBasicSystem(resultUrl)){
resultUrl = SystemUrls.getSystemUrl("imatrix");
}
log.info(" == system url : ["+resultUrl+"] == ");
resultUrl = resultUrl + url+"?companyId="+companyId+"&entityId="+entityId;
log.info(" == restlet url : ["+resultUrl+"] == ");
HttpGet httpget = new HttpGet(resultUrl);
HttpClient httpclient = new DefaultHttpClient();
ResponseHandler<String> responseHandler = new BasicResponseHandler();
try {
httpclient.execute(httpget, responseHandler);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
httpclient.getConnectionManager().shutdown();
}
/**
* RESTful请求
* @param url
* @param companyId
*/
publicstaticvoid restful(String url,Long companyId,Long entityId,String systemCode){
ClientConfig config = new DefaultClientConfig();
Client client = Client.create(config);
String resultUrl = SystemUrls.getSystemUrl(systemCode);
if(PropUtils.isBasicSystem(resultUrl)){
resultUrl = SystemUrls.getSystemUrl("imatrix");
}
log.info(" == system url : ["+resultUrl+"] == ");
resultUrl = resultUrl + url;
log.info(" == restlet url : ["+resultUrl+"] == ");
WebResource service = client.resource(resultUrl);
ClientResponse cr = service
.entity("companyId="+companyId+"&entityId="+entityId, MEDIA_TYPE)
.accept(MEDIA_TYPE)
.post(ClientResponse.class);
if(cr != null) log.info(" =========== RESTful execute result : ["+cr.getEntity(String.class)+"] =========== ");
}