Add a subscriber limit on both unicast and publish-subscribe
channels. This permits detection of inadvertent channel wiring
during context initialization.
Also add a mechanism to globally set these defaults.
Two properties are added to ChannelInitializer. If the
'channelInitializer' bean is declared before a channel, and
these properties are set, it will globally override the
default (Integer.MAX_VALUE) for these properties.
For example:
<bean id="channelInitializer" class="org.springframework.integration.config.xml.ChannelInitializer">
<property name="autoCreate" value="true" />
<property name="defaultMaxUnicastSubscribers" value="1" />
<property name="defaultMaxMulticastSubscribers" value="2" />
</bean>
will make the default max-subscribers 1 and 2 for <channel/> and
<publish-subscribe/> channels respectively.
Also applies to module channels (jms, amqp, redis).
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