This example demonstrates one technique for sending files to dynamic destinations.
See DynamicFtpChannelResolver. The resolve() method maps a customer to a
channel, where the channel is defined in a separate application context
for each customer. The application context property placeholders are configured
using the Spring 3.1 Environment management by supplying a custom property
source.
A real implementation would provide these properties based on the customer; this
sample simply uses the customer as part of the host name.
The application context is loaded from the file in src/main/resources/...
DynamicFtpChannelResolverTests is a simple JUnit test case that verifies
the same channel is used for the same customer each time, and that a
different channel is used for a different customer.
FtpOutboundChannelAdapterSample shows how messages sent with a different customer
header are routed to a different ftp adapter. It simply verifies that the
correct UnknownHostException is returned.
Notice in the config file how an expression-based router is used to invoke
the DynamicFtpChannelResolver to obtain a reference to the appropriate
channel for the customer. Notice that the channel resolver is a simple
POJO, invoked using SpEL...
<int:router input-channel="toDynRouter"
expression="@channelResolver.resolve(headers['customer'])"/>
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