How to use

withDefaultSystem

method

in

org.apache.samza.application.descriptors.StreamApplicationDescriptor

@Test(expected = IllegalStateException.class)
public void testSetDefaultSystemDescriptorAfterGettingOutputStream() {
 String streamId = "test-stream-1";
 GenericSystemDescriptor sd = new GenericSystemDescriptor("mockSystem", "mockSystemFactoryClass");
 GenericOutputDescriptor osd = sd.getOutputDescriptor(streamId, mock(Serde.class));
 new StreamApplicationDescriptorImpl(appDesc -> {
   appDesc.getOutputStream(osd);
   appDesc.withDefaultSystem(sd); // should throw exception
  }, getConfig());
}

@Test(expected = IllegalStateException.class)
public void testSetDefaultSystemDescriptorAfterGettingInputStream() {
 String streamId = "test-stream-1";
 GenericSystemDescriptor sd = new GenericSystemDescriptor("mockSystem", "mockSystemFactoryClass");
 GenericInputDescriptor isd = sd.getInputDescriptor(streamId, mock(Serde.class));
 new StreamApplicationDescriptorImpl(appDesc -> {
   appDesc.getInputStream(isd);
   appDesc.withDefaultSystem(sd); // should throw exception
  }, getConfig());
}

@Test
public void testMultipleSystemDescriptorForSameSystemName() {
 GenericSystemDescriptor sd1 = new GenericSystemDescriptor("mockSystem", "mockSystemFactoryClass");
 GenericSystemDescriptor sd2 = new GenericSystemDescriptor("mockSystem", "mockSystemFactoryClass");
 GenericInputDescriptor isd1 = sd1.getInputDescriptor("test-stream-1", mock(Serde.class));
 GenericInputDescriptor isd2 = sd2.getInputDescriptor("test-stream-2", mock(Serde.class));
 GenericOutputDescriptor osd1 = sd2.getOutputDescriptor("test-stream-3", mock(Serde.class));
 new StreamApplicationDescriptorImpl(appDesc -> {
   appDesc.getInputStream(isd1);
   try {
    appDesc.getInputStream(isd2);
    fail("Adding input stream with the same system name but different SystemDescriptor should have failed");
   } catch (IllegalStateException e) { }
   try {
    appDesc.getOutputStream(osd1);
    fail("adding output stream with the same system name but different SystemDescriptor should have failed");
   } catch (IllegalStateException e) { }
  }, getConfig());
 new StreamApplicationDescriptorImpl(appDesc -> {
   appDesc.withDefaultSystem(sd2);
   try {
    appDesc.getInputStream(isd1);
    fail("Adding input stream with the same system name as the default system but different SystemDescriptor should have failed");
   } catch (IllegalStateException e) { }
  }, getConfig());
}