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4.5. Message Router
Overview 复制链接链接已复制到粘贴板!
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A message router, shown in Figure 4.7, “Message Router Pattern”, is a type of filter that consumes messages from a single consumer endpoint and redirects them to the appropriate target endpoint, based on a particular decision criterion. A message router is concerned only with redirecting messages; it does not modify the message content.
Figure 4.7. Message Router Pattern
A message router can easily be implemented in Apache Camel using the
choice()
processor, where each of the alternative target endpoints can be selected using a when()
subclause (for details of the choice processor, see Section 1.5, “Processors”).
Java DSL example 复制链接链接已复制到粘贴板!
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The following Java DSL example shows how to route messages to three alternative destinations (either
seda:a
, seda:b
, or seda:c
) depending on the contents of the foo
header:
from("seda:a").choice() .when(header("foo").isEqualTo("bar")).to("seda:b") .when(header("foo").isEqualTo("cheese")).to("seda:c") .otherwise().to("seda:d");
from("seda:a").choice()
.when(header("foo").isEqualTo("bar")).to("seda:b")
.when(header("foo").isEqualTo("cheese")).to("seda:c")
.otherwise().to("seda:d");
XML configuration example 复制链接链接已复制到粘贴板!
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The following example shows how to configure the same route in XML:
Choice without otherwise 复制链接链接已复制到粘贴板!
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If you use
choice()
without an otherwise()
clause, any unmatched exchanges are dropped by default.