Examples of OverloadDispatcher

org.apache.s4.core.gen.OverloadDispatcher
This interface defines methods for dispatching input and output events to the most relevant methods of the processing elements.
onEvent and onTrigger methods may be overloaded with different subtypes of {@link Event} parameters.Methods defined in this interface dispatch an event to the method which is the best match according to the runtime type of the event.

Example: consider PE of type ExamplePE extends ProcessingElement that defines methods:
- onEvent(EventA event)
- onEvent(EventB event)
Then:
- When event1 of type EventA extends Event is received on this PE, it will be handled by method onEvent(EventA event)
- When event2 of type EventB extends EventA is received on this PE, it will be handled by method onEvent(EventB event)
Implementations of this interface are typically generated at runtime.

Examples of org.apache.s4.core.gen.OverloadDispatcher

public class OverloadDispatcherTest {


    @Test
    public void testDispatchWithEventHierarchies() throws Exception {
        OverloadDispatcherGenerator gen = new OverloadDispatcherGenerator(A.class);
        OverloadDispatcher dispatcher = (OverloadDispatcher) gen.generate().newInstance();
        A a = new A();
        // input events
        dispatcher.dispatchEvent(a, new Event1());
        Assert.assertEquals(Event1.class, a.processedEventClass);
        dispatcher.dispatchEvent(a, new Event1a());
        Assert.assertEquals(Event1a.class, a.processedEventClass);
        dispatcher.dispatchEvent(a, new Event2());
        Assert.assertEquals(Event2.class, a.processedEventClass);
       
        // trigger events
        dispatcher.dispatchTrigger(a, new Event2());
        Assert.assertEquals(Event2.class, a.processedTriggerEventClass);
        Assert.assertTrue(a.processedTriggerThroughGenericMethod);
        dispatcher.dispatchTrigger(a, new Event1());
        Assert.assertEquals(Event1.class, a.processedTriggerEventClass);
        Assert.assertFalse(a.processedTriggerThroughGenericMethod);
    }

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Examples of org.apache.s4.core.gen.OverloadDispatcher

    }
    
    @Test
    public void testDispatchWithSingleMethod() throws Exception {
        OverloadDispatcherGenerator gen = new OverloadDispatcherGenerator(C.class);
        OverloadDispatcher dispatcher = (OverloadDispatcher) gen.generate().newInstance();
        C c = new C();
        dispatcher.dispatchEvent(c, new Event2());
        Assert.assertFalse(c.processedEvent1Class);
        dispatcher.dispatchEvent(c, new Event1());
        Assert.assertTrue(c.processedEvent1Class);
    }

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Examples of org.apache.s4.core.gen.OverloadDispatcher

        try {
            ByteArrayOutputStream tmpOut = new ByteArrayOutputStream();
            System.setOut(new PrintStream(tmpOut));


            OverloadDispatcherGenerator gen = new OverloadDispatcherGenerator(B.class);
            OverloadDispatcher dispatcher = (OverloadDispatcher) gen.generate().newInstance();
            B b = new B();
            dispatcher.dispatchEvent(b, new Event1());
            String output = tmpOut.toString().trim();
            // use DOTALL to ignore previous lines in output debug mode
            Assert.assertTrue(Pattern.compile("^.+OverloadDispatcher\\d+ - Cannot dispatch event "
                    + "of type \\[" + Event1.class.getName() + "\\] to PE of type \\[" + B.class.getName()
                    + "\\] : no matching onEvent method found$", Pattern.DOTALL).matcher(output).matches());

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Examples of org.apache.s4.core.gen.OverloadDispatcher

    }
    
    @Test
    public void testGenericEvent() throws Exception {
        OverloadDispatcherGenerator gen = new OverloadDispatcherGenerator(D.class);
        OverloadDispatcher dispatcher = (OverloadDispatcher) gen.generate().newInstance();
        D d = new D();
        dispatcher.dispatchEvent(d, new Event2());
        Assert.assertTrue(d.processedGenericEvent);
        dispatcher.dispatchEvent(d, new Event1());
        Assert.assertTrue(d.processedEvent1);
    }

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Examples of org.apache.s4.core.gen.OverloadDispatcher

public class OverloadDispatcherTest {


    @Test
    public void testDispatchWithEventHierarchies() throws Exception {
        OverloadDispatcherGenerator gen = new OverloadDispatcherGenerator(A.class);
        OverloadDispatcher dispatcher = (OverloadDispatcher) gen.generate().newInstance();
        A a = new A();
        // input events
        dispatcher.dispatchEvent(a, new Event1());
        Assert.assertEquals(Event1.class, a.processedEventClass);
        dispatcher.dispatchEvent(a, new Event1a());
        Assert.assertEquals(Event1a.class, a.processedEventClass);
        dispatcher.dispatchEvent(a, new Event2());
        Assert.assertEquals(Event2.class, a.processedEventClass);
       
        // trigger events
        dispatcher.dispatchTrigger(a, new Event2());
        Assert.assertEquals(Event2.class, a.processedTriggerEventClass);
        Assert.assertTrue(a.processedTriggerThroughGenericMethod);
        dispatcher.dispatchTrigger(a, new Event1());
        Assert.assertEquals(Event1.class, a.processedTriggerEventClass);
        Assert.assertFalse(a.processedTriggerThroughGenericMethod);
    }

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Examples of org.apache.s4.core.gen.OverloadDispatcher

    }
    
    @Test
    public void testDispatchWithSingleMethod() throws Exception {
        OverloadDispatcherGenerator gen = new OverloadDispatcherGenerator(C.class);
        OverloadDispatcher dispatcher = (OverloadDispatcher) gen.generate().newInstance();
        C c = new C();
        dispatcher.dispatchEvent(c, new Event2());
        Assert.assertFalse(c.processedEvent1Class);
        dispatcher.dispatchEvent(c, new Event1());
        Assert.assertTrue(c.processedEvent1Class);
    }

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Examples of org.apache.s4.core.gen.OverloadDispatcher

        try {
            ByteArrayOutputStream tmpOut = new ByteArrayOutputStream();
            System.setOut(new PrintStream(tmpOut));


            OverloadDispatcherGenerator gen = new OverloadDispatcherGenerator(B.class);
            OverloadDispatcher dispatcher = (OverloadDispatcher) gen.generate().newInstance();
            B b = new B();
            dispatcher.dispatchEvent(b, new Event1());
            String output = tmpOut.toString().trim();
            // use DOTALL to ignore previous lines in output debug mode
            Assert.assertTrue(Pattern.compile("^.+OverloadDispatcher\\d+ - Cannot dispatch event "
                    + "of type \\[" + Event1.class.getName() + "\\] to PE of type \\[" + B.class.getName()
                    + "\\] : no matching onEvent method found$", Pattern.DOTALL).matcher(output).matches());

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Examples of org.apache.s4.core.gen.OverloadDispatcher

    }
    
    @Test
    public void testGenericEvent() throws Exception {
        OverloadDispatcherGenerator gen = new OverloadDispatcherGenerator(D.class);
        OverloadDispatcher dispatcher = (OverloadDispatcher) gen.generate().newInstance();
        D d = new D();
        dispatcher.dispatchEvent(d, new Event2());
        Assert.assertTrue(d.processedGenericEvent);
        dispatcher.dispatchEvent(d, new Event1());
        Assert.assertTrue(d.processedEvent1);
    }

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