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

        // 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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        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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        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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    /**
     * Factory method to create a {@link org.apache.camel.ConsumerTemplate} to be injected into a POJO
     */
    protected ConsumerTemplate createInjectionConsumerTemplate(String endpointUri, String endpointRef, String endpointProperty,
                                                               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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    @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 endpointProperty,
                                                               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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    /**
     * 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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    /**
     * Factory method to create a {@link org.apache.camel.ConsumerTemplate} to be injected into a POJO
     */
    protected ConsumerTemplate createInjectionConsumerTemplate(String endpointUri, String endpointRef, String endpointProperty,
                                                               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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