health check before processing file stream in xd - spring-integration

Question

I am pulling files from s3 and processing them using spring xd. I have one processor http client component where i do some RESTful request .Now the problem with this approach is if my webservice is down the files get accumulated in rabbit mq transport .Hence before pulling a individual file from s3 I want to do a health check on my rest service.How can I tackle this my configuration file looks something like this.
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:int="http://www.springframework.org/schema/integration"
xmlns:int-aws="http://www.springframework.org/schema/integration/aws"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
http://www.springframework.org/schema/integration/aws http://www.springframework.org/schema/integration/aws/spring-integration-aws-1.0.xsd">
<int:poller fixed-delay="${fixed-delay}" default="true"/>
<bean id="credentials" class="org.springframework.integration.aws.core.BasicAWSCredentials">
<property name="accessKey" value="${accessKey}"/>
<property name="secretKey" value="${secretKey}"/>
</bean>
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>dms-aws-s3-nonprod.properties</value>
</property>
</bean>
<bean id="clientConfiguration" class="com.amazonaws.ClientConfiguration">
<property name="proxyHost" value="${proxyHost}"/>
<property name="proxyPort" value="${proxyPort}"/>
<property name="preemptiveBasicProxyAuth" value="false"/>
</bean>
<bean id="s3Operations" class="org.springframework.integration.aws.s3.core.CustomC1AmazonS3Operations">
<constructor-arg index="0" ref="credentials"/>
<constructor-arg index="1" ref="clientConfiguration"/>
<property name="awsEndpoint" value="s3.amazonaws.com"/>
<property name="temporaryDirectory" value="${temporaryDirectory}"/>
<property name="awsSecurityKey" value="${awsSecurityKey}"/>
</bean>
<!-- aws-endpoint="https://s3.amazonaws.com" -->
<int-aws:s3-inbound-channel-adapter aws-endpoint="s3.amazonaws.com"
bucket="${bucket}"
s3-operations="s3Operations"
credentials-ref="credentials"
file-name-wildcard="${file-name-wildcard}"
remote-directory="${remote-directory}"
channel="splitChannel"
local-directory="${local-directory}"
accept-sub-folders="false"
delete-source-files="true"
archive-bucket="${archive-bucket}"
archive-directory="${archive-directory}">
</int-aws:s3-inbound-channel-adapter>
int-file:splitter input-channel="splitChannel" output-channel="output" markers="true"/>
<int:channel id="output"/>
My stream defination
xd-shell>stream create feedTest16 --definition "aws-s3-source |processor-http-client| log" --deploy

Answer 1

Starting with Spring Integration 4.1, the PollSkipAdvice has been introduced.
Implement your own ServiceHealthCheckPollSkipStrategy and inject it into the <advice-chain> of the <poller> for your <int-aws:s3-inbound-channel-adapter> and you're good with the requirement!
Only one issue is there that your s3-source is tied with the target service for the http-client...