topic Re: Is there a way to retrieve deployed bpmn20.xml from db? in Alfresco Archive

Is there a way to retrieve deployed bpmn20.xml from db?

yatish — Tue, 09 Aug 2011 18:31:01 GMT

Hi,We are evaluating Activiti for our upcoming product. So far, It is impressive. From following post, It appears that there is no built in way to auto deployment.http://forums.activiti.org/en/viewtopic.php?f=6&t=1686&p=7091&hilit=auto+deploy#p7091So, I tried to write my own. Someone els

Re: Is there a way to retrieve deployed bpmn20.xml from db?

frederikherema1 — Wed, 10 Aug 2011 11:22:41 GMT

Getting the resource as stream is the only way. Make sure you write the xml as UTF-8… How does the file you write from the stream look like?

If you're using spring, autodeploy is possible when engine is booted: (Automatic Resource Deployment) http://www.activiti.org/userguide/index.html#N10549
Deployment when file changes on disk, however, is not possible (you should write your own poller for this) -> this is what the forum post you refer to is about

Re: Is there a way to retrieve deployed bpmn20.xml from db?

yatish — Wed, 10 Aug 2011 19:38:37 GMT

Hi frederikheremans,

Thanks for your reply,

You can see how i was writing file earlier, and after your suggestion of writing xml as UTF-8, I am writing it as following:
=================================
   InputStream ipStream = repositoryService.getResourceAsStream(procDef.getDeploymentId(), procDef.getResourceName());
   Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("C:\\tmp\\tempDeployementFile.xml"), "UTF-8"));
   int length;
   byte buffer[]=new byte[1024];
                 while((length=ipStream.read(buffer))>0)
                 {
                  Map charsetMap = Charset.availableCharsets();
                  Charset charset = (Charset)charsetMap.get("UTF-8");
                  String str = new String(buffer,charset);
                  out.write(str);
                 }
                        ipStream.close();
                        out.close();
=================================
whatever way i write it to the xml, the output file is same.

I have attached two files here:
tempDeployementFile.xml - represents the file which i get from DB
serverflow.bpmn20.xml - represents the file on the file system

Any suggestions, pointers are highly appreciated.

Thanks,
Yatish

Re: Is there a way to retrieve deployed bpmn20.xml from db?

frederikherema1 — Tue, 16 Aug 2011 12:10:09 GMT

Strange, we have unit-test for this. take a look at org.activiti.engine.test.bpmn.deployment.BpmnDeploymentTest, there the file content is checked:


 @Deployment
  public void testGetBpmnXmlFileThroughService() {
    String deploymentId = repositoryService.createDeploymentQuery().singleResult().getId();
    List<String> deploymentResources = repositoryService.getDeploymentResourceNames(deploymentId);
    
    // verify bpmn file name
    assertEquals(1, deploymentResources.size());
    String bpmnResourceName = "org/activiti/engine/test/bpmn/deployment/BpmnDeploymentTest.testGetBpmnXmlFileThroughService.bpmn20.xml";
    assertEquals(bpmnResourceName, deploymentResources.get(0));
    
    ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery().singleResult();
    assertEquals(bpmnResourceName, processDefinition.getResourceName());
    assertNull(processDefinition.getDiagramResourceName());
    assertFalse(processDefinition.hasStartFormKey());
    
    ReadOnlyProcessDefinition readOnlyProcessDefinition = ((RepositoryServiceImpl)repositoryService).getDeployedProcessDefinition(processDefinition.getId());
    assertNull(readOnlyProcessDefinition.getDiagramResourceName());
    
    // verify content
    InputStream deploymentInputStream = repositoryService.getResourceAsStream(deploymentId, bpmnResourceName);
    String contentFromDeployment = readInputStreamToString(deploymentInputStream);
    assertTrue(contentFromDeployment.length() > 0);
    assertTrue(contentFromDeployment.contains("process id=\"emptyProcess\""));
    
    InputStream fileInputStream = ReflectUtil.getResourceAsStream("org/activiti/engine/test/bpmn/deployment/BpmnDeploymentTest.testGetBpmnXmlFileThroughService.bpmn20.xml");
    String contentFromFile = readInputStreamToString(fileInputStream);
    assertEquals(contentFromFile, contentFromDeployment);
  }

 private String readInputStreamToString(InputStream inputStream) {
    byte[] bytes = IoUtil.readInputStream(inputStream, "input stream");
    return new String(bytes);
  }

– IOUtil:

public static byte[] readInputStream(InputStream inputStream, String inputStreamName) {
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    byte[] buffer = new byte[16*1024];
    try {
      int bytesRead = inputStream.read(buffer);
      while (bytesRead!=-1) {
        outputStream.write(buffer, 0, bytesRead);
        bytesRead = inputStream.read(buffer);
      }
    } catch (Exception e) {
      throw new ActivitiException("couldn't read input stream "+inputStreamName, e);
    }
    return outputStream.toByteArray();
  }

Re: Is there a way to retrieve deployed bpmn20.xml from db?

yatish — Fri, 19 Aug 2011 18:28:09 GMT

Great! I just used Activiti's IOUtil class and it worked well according to my requirement. I had similar code in my implementation, but, i was writing string to outStream than bytes.

Thanks again for your reply!

-Yatish