SI Cafe Example for blog

<int:gateway id="cafe" service-interface="org.springframework.integration.samples.cafe.Cafe"/>

<!-- each order has a collection of order items that is split apart to be processed -->
<int:channel id="orders"/>
<int:splitter input-channel="orders" expression="payload.items" output-channel="drinks"/>

<!-- The router sends different drink orders on different paths -->
<int:channel id="drinks"/>
<int:router input-channel="drinks"  expression="payload.iced ? 'coldDrinks' : 'hotDrinks'"/>

<!-- individual order items are processed by the barista -->
<int:channel id="coldDrinks">
        <int:queue capacity="10"/>
</int:channel>
<int:service-activator input-channel="coldDrinks" ref="barista" method="prepareColdDrink" output-channel="preparedDrinks"/>

<!-- individual order items are processed by the barista -->
<int:channel id="hotDrinks">
	<int:queue capacity="10"/>
</int:channel>
<int:service-activator input-channel="hotDrinks" ref="barista" method="prepareHotDrink" output-channel="preparedDrinks"/>

<!-- drink order items are aggregated in a call to the waiter -->
<int:channel id="preparedDrinks"/>
<int:aggregator input-channel="preparedDrinks"  method="prepareDelivery" output-channel="deliveries">
	<beans:bean class="org.springframework.integration.samples.cafe.xml.Waiter"/>
</int:aggregator>

<int-stream:stdout-channel-adapter id="deliveries"/>

<beans:bean id="barista" class="org.springframework.integration.samples.cafe.xml.Barista"/>

<int:poller id="poller" default="true" fixed-delay="1000"/>