Examples of org.mule.processor.chain.DefaultMessageProcessorChainBuilder.build()

org.mule.processor.chain.DefaultMessageProcessorChainBuilder.build()

This builder supports the chaining together of message processors that intercept and also those that don't. While one can iterate over message processor intercepting message processors need to be chained together. One solution is make all message processors intercepting (via adaption) and chain them all together, this results in huge stack traces and recursive calls with adaptor. The alternative is to build the chain in such a way that we iterate when we can and chain where we need to.
We iterate over the list of message processor to be chained together in reverse order collecting up those that can be iterated over in a temporary list, as soon as we have an intercepting message processor we create a DefaultMessageProcessorChain using the temporary list and set it as a listener of the intercepting message processor and then we continue with the algorithm

        builder.chain(
            new StringAppendTransformer("1"),
            new ResponseMessageProcessorAdapter(new DefaultMessageProcessorChainBuilder().chain(
                new StringAppendTransformer("a"), new StringAppendTransformer("b"), new ReturnNullMP())
                .build()), new StringAppendTransformer("2"));
        assertEquals("012", builder.build().process(getTestEventUsingFlow("0")).getMessageAsString());
    }


    private static class ReturnNullMP implements MessageProcessor
    {
        public MuleEvent process(MuleEvent event) throws MuleException

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