I would like to start/end a scheduled task in Spring with a button clicked. The scheduled task annotated with #Scheduled is stopped like this:
#Autowired
private ThreadPoolTaskExecutor executor;
#Autowired
private ThreadPoolTaskScheduler scheduler;
public void stop() {
scheduler.destroy();
executor.destroy();
}
but how to start this task again? The following tries does not work:
scheduler.initialize();
executor.initialize();
OR
scheduler.getScheduledThreadPoolExecutor().prestartAllCoreThreads();
executor.getThreadPoolExecutor().prestartAllCoreThreads();
How to do this? Any tips/suggestions are welcome.
Related
After reading some articles about the CDI and Java FX integration, and the source codes of javafx-weaver spring integration.
I decided to add CDI integration to Java FX via the existing javafx-weaver work to simplify the integration work.
The source code can be found here.
I added a simple producer to expose FxWeaver to the CDI context.
#ApplicationScoped
public class FxWeaverProducer {
private static final Logger LOGGER = Logger.getLogger(FxWeaverProducer.class.getName());
#Produces
FxWeaver fxWeaver(CDIControllerFactory callback) {
var fxWeaver = new FxWeaver((Callback<Class<?>, Object>) callback,
() -> LOGGER.log(Level.INFO, "calling FxWeaver shutdown hook")
);
return fxWeaver;
}
public void destroyFxWeaver(#Disposes FxWeaver fxWeaver) {
LOGGER.log(Level.INFO, "destroying FxWeaver bean...");
fxWeaver.shutdown();
}
}
The problem is when using fxWeaver.loadView to load view, the controller did not work as expected.
#ApplicationScoped
#FxmlView("HandlingReport.fxml")
public class HandlingReportController {
private final static Logger LOGGER = Logger.getLogger(HandlingReportController.class.getName());
#Inject
private HandlingReportService handlingReportService;
//fxml properties...
#FXML
private void onSubmit(){...}
}
As above codes, the dependent service handlingReportService in the controller class is null(not injected) when performing an action like onSubmit, it seems when JavaFX handles the #FXML properties binding it always used java reflection API.
If I change the method to public void onSubmit()( use public modifier), all FX fields become null when pressing the onSubmit button.
Any idea to fix this issue?
Marked the controller class as #Dependentscope to resolve the problem.
#Dependent
public class HandlingReportController { ...}
In my JSF application i have a process that takes to long to complete and i don't want that the user keeps waiting till its finish. I'm trying to implement some kind of 'fire and forget task' to run in background.
I'm doing it using an #Asynchronous method. This is the right approach?
My controller:
#ViewScoped
#Named
public class Controller implements Serializable {
private static final long serialVersionUID = -6252722069169270081L;
#Inject
private Record record;
#Inject
private Service service;
public void save() {
this.record.generateHash();
boolean alreadyExists = this.service.existsBy(this.record.getHash());
if (alreadyExists)
Messages.add(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "Error", "This record already exists"));
else {
this.service.save(this.record);
this.clearFields();
}
}
}
My service:
#Stateless
public class Service extends AbstractService<Record> {
private static final long serialVersionUID = -6327726420832825798L;
#Inject
private BeanManager beanManager;
#Override
public void save(Record record) {
super.save(record);
this.preProcess(record);
}
#Asynchronous
private void preProcess(Cd cd) {
// Long task running here ...
this.beanManager.fireEvent(cd);
}
}
But even with this approach the user keeps stuck at the page till the preProcess method finishes.
The problem here is that annotations that modify the behavior of EJBs (and CDI beans) are only applied when called by the "proxy" object that gets injected to appropriate injection points, like fields annotated with #EJB or #Inject.
This is because of how the containers implement the functionality that modifies the behavior. The object that the container injects to clients of EJBs (and normal-scoped CDI beans) is actually a proxy that knows how to call the correct instance of the target bean (e.g. the correct instance of e #RequestScoped bean). The proxy also implements the extra behaviors, like #Transactional or #Asynchronous. Calling the method through this bypasses the proxy functionalities! For this reason placing these annotations on non-public methods is effectively a NO-OP!
A non-exclusive list of solutions:
Move preProcess() to a different EJB, make it public and keep the #Asynchronous annotation
Make preProcess() public and call it from the Controller
If the computation is truly private to the Service and exposing it would break design, and ou don't mind doing a bit more manual work, you can always run async tasks from the container-provided ManagedExecutorService:
#Resource
private ManagedExecutorService managedExecutorService;
Pay attention to the semantics of the thread that executes your code - more specifically to what context values are propagated and what not! Well, you have to pay attention to that for #Asynchronous methods too!
Currently I am trying to get my script to run on a tomcat server by using the basic web container guidelines for spring-batch-boot from the documentation https://docs.spring.io/spring-batch/reference/html/configureJob.html
The script was working correctly as a jar file before modifications to the main class but when I try converting it to a servlet I am having issues with my #PostConstruct starting only on server startup. This code sets application.properties to spring.batch.job.enabled=false and has a controller of
#Controller
public class JobLauncherController {
#Autowired
JobLauncher jobLauncher;
#Autowired
Job job;
#RequestMapping("/jobLauncher.html")
public void handle() throws Exception{
jobLauncher.run(job, new JobParameters());
}
With The main Application to start the servlet for tomcat as
#SpringBootApplication
#EnableBatchProcessing
public class BatchApplication extends SpringBootServletInitializer{
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(BatchApplication.class);
}
public static void main(String[] args) {
SpringApplication.run(BatchApplication.class, args);
}
The problem is that my job uses custom item readers and writers that initializes it before running it using #PostConstruct. It runs the #PostConstruct at server startup which is what helps initialize the beans for writing.
My item readers/writers look like this
public class CustomReader extends ItemStreamSupport implements ItemReader<Acct>, ResourceAwareItemReaderItemStream<Acct> {
//basic autowiring
private int nextAcctIndex;
private List<Acct> acctsList = new ArrayList();
#PostConstruct
private void initialize() throws IOException {
//logic to parse files
acctsList = Collections.unmodifiableList(acctsList);
nextAcctIndex = 0;
}
#Override
public Acct read() throws Exception, UnexpectedInputException, ParseException, NonTransientResourceException {
// System.out.println("Start Read");
Acct nextAcct = null;
if (nextAcctIndex < acctsList.size()) {
nextAcct = acctsList.get(nextAcctIndex);
nextAcctIndex++;
//System.out.println(nextAcct);
}
The BatchConfiguration calls everything like most examples as
#Bean public
IteamReader<Acct> CustomReader(){ return new CustomReader();}
My question is am I going about this the wrong way or is there a way to make it so the #PostConstruct is able to be called only when the Controller request for it?
you need to use
#BeforeStep
public void beforeStep(StepExecution stepExecution) {
init();
}
#PostConstruct is used to initialize once after applicationContext is loaded.
In your case you want to run this initialization every time job is running (you don't want data to be leaked across different jobs, right?)
using #schedule in EJB timer, i want to pass the schedule details from database. but it is not allowing passing values. What should i do. In #timeout also i'm not able to start the thread automatically at server start time. #Postconstruct is not working.
You might have to use #Timeout, #Singleton, #Startup and #ConcurrencyManagement
#Singleton(name = "...", mappedName = "")
#Startup
#ConcurrencyManagement(ConcurrencyManagementType.BEAN) // this is threadsafe!!!
public class .......
Inject the TimerService for configuration
#Resource
private TimerService timerService;
Inject the EntityManager for db-access
#PersistenceUnit(..)
private EntityManager entityManager
Use #Timeout instead of #Schedule
#Timeout
void timer() { .... }
Configure the timer
#PostConstruct
void postConstruct() {
entityManager.createQuery(....);
.
.
timerService.createIntervalTimer(....);
}
except usage of EntityManager, this works at our site.
I'm trying to test a spring rest controller class using JUnit, Mockito, Spring test and Spring Security test. The following is my rest controller class for which i'm performing the test;
#RestController
public class EmployeeRestController {
#Autowired
private EmployeeService employeeService;
#PreAuthorize("hasAnyRole('ROLE_EMPSUPEADM')")
#RequestMapping(value = "/fetch-timezones", method = RequestMethod.GET)
public ResponseEntity<List<ResponseModel>> fetchTimeZones() {
List<ResponseModel> timezones = employeeService.fetchTimeZones();
return new ResponseEntity<>(timezones, HttpStatus.OK);
}
}
The following is my test class;
#RunWith(SpringJUnit4ClassRunner.class)
#ContextConfiguration(classes = {SpringConfiguration.class})
#WebAppConfiguration
public class EmployeeRestControllerUnitTest {
private MockMvc mockMvc;
#Autowired
private WebApplicationContext webApplicationContext;
#Mock
private EmployeeService employeeService;
#InjectMocks
private EmployeeRestController employeeRestController;
#Before
public void init() {
MockitoAnnotations.initMocks(this);
Mockito.reset(employeeService);
mockMvc = MockMvcBuilders
.webAppContextSetup(webApplicationContext)
.build();
}
#Test
#WithMockUser(roles = {"EMPSUPEADM"})
public void testFetchTimezones() {
try {
mockMvc.perform(get("/fetch-timezones"))
.andExpect(status().isOk())
.andExpect(content().contentType(MediaType.APPLICATION_JSON_UTF8))
.andExpect(jsonPath("$", hasSize(4)));
verify(emploeeService, times(1)).fetchTimeZones();
verifyNoMoreInteractions(employeeService);
} catch (Exception e) {
e.printStackTrace();
}
}
}
I made the above test class by refering many tutorials. The problem is i'm not able to understand everything clearly. so, i'm having the following doubts.
I'm creating a mock of EmployeeService and injecting it into EmployeeRestController using #InjectMocks, then why i'm getting the following failure;
Wanted but not invoked:
careGroupService.fetchTimeZones();
-> at com.example.api.test
.restcontroller.EmployeeRestControllerUnitTest
.testFetchTimezones(EmployeeRestControllerUnitTest.java:73)
Actually, there were zero interactions with this mock.
How does MockMvcBuilders.webAppContextSetup(webApplicationContext).build(); works exactly.
I know that MockMvcBuilders.standaloneSetup(employeeRestController) is for testing individual controller classes and spring configuration will not be available for this method. How can we provide spring configuraton for this method, is it possible.
Finally, how does this piece of code: Mockito.reset(employeeService); works.
1) you do verify for
verify(emploeeService, times(1)).fetchTimeZones();
but you didn't setup mock behaviour for it (before you call mockMvc.perform(get("/fetch-timezones"))).
List<ResponseModel> timezones = new ArrayList<>();
when(emploeeService.fetchTimeZones()).thenReturn(timezones );
2) create MockMvc from context. mockmvc emulates web container, use mock for all where is possible but supports http call and gave the possibility to call controller.
It stands up the Dispatcher Servlet and all required MVC components,
allowing us to test an endpoint in a proper web environment, but
without the overhead of running a server.
3) when you use:
#MockBean private EmployeeService employeeService;
you override real service. remove it from test class real service will be used in testing. Instead of use #Mock use #MockBean. #MockBean it's override by container, with #Mock you need to inject this into controller by reflection
or without spring boot with reflection:
#Before
public void init() {
MockitoAnnotations.initMocks(this);
Mockito.reset(employeeService);
mockMvc = MockMvcBuilders
.webAppContextSetup(webApplicationContext)
.build();
EmployeeRestController employeeRestController=
webAppContext.getBean(EmployeeRestController.class);
ReflectionTestUtils.setField(employeeRestController,
"employeeService",
employeeService);
}
4) Mockito.reset(employeeService);- you reset all behaviors that you setupped before. Mock contains information from when(), verify() and controls it , call reset - it's clean all information.