Examples of org.apache.camel.ConsumerTemplate

org.apache.camel.ConsumerTemplate
.apache.org/polling-consumer.html">Polling Consumer EIP. This is not the Event Driven Consumer EIP.
All methods throws {@link RuntimeCamelException} if consuming ofthe {@link Exchange} failed and an Exception occurred. The getCausemethod on {@link RuntimeCamelException} returns the wrapper original causedexception.
All the receiveBody methods will return the content according to this strategy
- throws {@link RuntimeCamelException} as stated above
- The fault.body if there is a fault message set and its not null
- The out.body if there is a out message set and its not null
- The in.body
Before using the template it must be started. And when you are done using the template, make sure to {@link #stop()} the template.

Important note on usage: See this FAQ entry before using, it applies to this {@link ConsumerTemplate} as well. @version

        String out = consumer.receiveBody("seda:foo", String.class);
        assertEquals("Bye World", out);
    }


    public void testCacheConsumers() throws Exception {
        ConsumerTemplate template = new DefaultConsumerTemplate(context);
        template.setMaximumCacheSize(500);
        template.start();


        assertEquals("Size should be 0", 0, template.getCurrentCacheSize());


        // test that we cache at most 500 consumers to avoid it eating to much memory
        for (int i = 0; i < 503; i++) {
            Endpoint e = context.getEndpoint("direct:queue:" + i);
            template.receiveNoWait(e);
        }


        assertEquals("Size should be 500", 500, template.getCurrentCacheSize());
        template.stop();


        // should be 0
        assertEquals("Size should be 0", 0, template.getCurrentCacheSize());
    }

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        // should be 0
        assertEquals("Size should be 0", 0, template.getCurrentCacheSize());
    }


    public void testCacheConsumersFromContext() throws Exception {
        ConsumerTemplate template = context.createConsumerTemplate(500);


        assertEquals("Size should be 0", 0, template.getCurrentCacheSize());


        // test that we cache at most 500 consumers to avoid it eating to much memory
        for (int i = 0; i < 503; i++) {
            Endpoint e = context.getEndpoint("direct:queue:" + i);
            template.receiveNoWait(e);
        }


        assertEquals("Size should be 500", 500, template.getCurrentCacheSize());
        template.stop();


        // should be 0
        assertEquals("Size should be 0", 0, template.getCurrentCacheSize());
    }

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    @Test
    public void shouldNotBreakRedeliveriesOfSecondContextAfterFirstBeingStopped() throws Exception {
        DefaultCamelContext context1 = createContext();
        ProducerTemplate producer1 = context1.createProducerTemplate();
        ConsumerTemplate consumer1 = context1.createConsumerTemplate();
        context1.start();
        producer1.sendBody("seda://input", "Hey1");
        Exchange ex1 = consumer1.receive("seda://output", 5000);


        DefaultCamelContext context2 = createContext();
        ProducerTemplate producer2 = context2.createProducerTemplate();
        ConsumerTemplate consumer2 = context2.createConsumerTemplate();
        context2.start();


        // now stop 1, and see that 2 is still working
        consumer1.stop();
        producer1.stop();
        context1.stop();


        producer2.sendBody("seda://input", "Hey2");
        Exchange ex2 = consumer2.receive("seda://output", 5000);


        Assert.assertNotNull(ex1);
        Assert.assertEquals("Hey1", ex1.getIn().getBody());
        Assert.assertNotNull(ex2);
        Assert.assertEquals("Hey2", ex2.getIn().getBody());


        consumer2.stop();
        producer2.stop();
        context2.stop();
    }

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    private CamelContext context;


    public void testTemplateMaximumCache() throws Exception {
        assertNotNull("Should have injected a consumer template", template);


        ConsumerTemplate lookup = context.getRegistry().lookup("template", ConsumerTemplate.class);
        assertNotNull("Should lookup consumer template", lookup);


        assertEquals(50, template.getMaximumCacheSize());
        assertEquals("Size should be 0", 0, template.getCurrentCacheSize());

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    @Autowired
    private CamelContext context;


    public void testHasTwoTemplates() {
        ConsumerTemplate lookup = context.getRegistry().lookup("myTemplate", ConsumerTemplate.class);
        assertNotNull("Should lookup producer template", lookup);


        ConsumerTemplate lookup2 = context.getRegistry().lookup("myOtherTemplate", ConsumerTemplate.class);
        assertNotNull("Should lookup producer template", lookup2);


        assertNotSame("Should not be same", lookup, lookup2);
    }

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    @Test
    public void shouldNotBreakRedeliveriesOfSecondContextAfterFirstBeingStopped() throws Exception {
        DefaultCamelContext context1 = createContext();
        ProducerTemplate producer1 = context1.createProducerTemplate();
        ConsumerTemplate consumer1 = context1.createConsumerTemplate();
        context1.start();
        producer1.sendBody("seda://input", "Hey1");
        Exchange ex1 = consumer1.receive("seda://output", 5000);


        DefaultCamelContext context2 = createContext();
        ProducerTemplate producer2 = context2.createProducerTemplate();
        ConsumerTemplate consumer2 = context2.createConsumerTemplate();
        context2.start();


        // now stop 1, and see that 2 is still working
        context1.stop();


        producer2.sendBody("seda://input", "Hey2");
        Exchange ex2 = consumer2.receive("seda://output", 5000);


        Assert.assertNotNull(ex1);
        Assert.assertEquals("Hey1", ex1.getIn().getBody());
        Assert.assertNotNull(ex2);
        Assert.assertEquals("Hey2", ex2.getIn().getBody());

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    /**
     * Factory method to create a {@link org.apache.camel.ConsumerTemplate} to be injected into a POJO
     */
    protected ConsumerTemplate createInjectionConsumerTemplate(String endpointUri, String endpointRef, String injectionPointName) {
        ConsumerTemplate answer = new DefaultConsumerTemplate(getCamelContext());
        // start the template so its ready to use
        try {
            answer.start();
        } catch (Exception e) {
            throw ObjectHelper.wrapRuntimeCamelException(e);
        }
        return answer;
    }

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    private CamelContext context;


    public void testTemplateMaximumCache() throws Exception {
        assertNotNull("Should have injected a consumer template", template);


        ConsumerTemplate lookup = context.getRegistry().lookup("template", ConsumerTemplate.class);
        assertNotNull("Should lookup consumer template", lookup);


        assertEquals(50, template.getMaximumCacheSize());
        assertEquals("Size should be 0", 0, template.getCurrentCacheSize());

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    private CamelContext context;


    public void testHasExistingTemplate() {
        assertNotNull("Should have injected a consumer template", template);


        ConsumerTemplate lookup = context.getRegistry().lookup("myConsumerTemplate", ConsumerTemplate.class);
        assertNotNull("Should lookup consumer template", lookup);


        ConsumerTemplate lookup2 = context.getRegistry().lookup("consumerTemplate", ConsumerTemplate.class);
        assertNull("Should not be able to lookup consumer template", lookup2);
    }

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        ConsumerTemplate lookup2 = context.getRegistry().lookup("consumerTemplate", ConsumerTemplate.class);
        assertNull("Should not be able to lookup consumer template", lookup2);
    }


    public void testShouldBeSingleton() {
        ConsumerTemplate lookup = context.getRegistry().lookup("myConsumerTemplate", ConsumerTemplate.class);
        assertNotNull("Should lookup producer template", lookup);


        ConsumerTemplate lookup2 = context.getRegistry().lookup("myConsumerTemplate", ConsumerTemplate.class);
        assertNotNull("Should lookup producer template", lookup);


        assertSame("Should be same instances (singleton)", lookup, lookup2);
    }

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org.apache.camel.impl.DefaultConsumerTemplateTest

org.apache.camel.impl.DefaultConsumerTemplateWithCustomCacheMaxSizeTest

org.apache.camel.issues.RedeliveryErrorHandlerAsyncDelayedTwoCamelContextIssueTest

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org.apache.camel.spring.config.ConsumerTemplateAlreadyExistTest

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