Is there a way to poll several addresses using Mule's HttpPollingConnector?

Question

I am trying to poll several addresses (URL links) from a list that contains all these addresses using the http polling connector in Mule. Currently, I am only able to poll from one address but I would like to find a way to use this list to iterate the polling for each site. Is there anything built within Mule that provides such function?

Answer 1

Is composite source what you're looking for? It allows you to have more than one endpoint in the inbound.

e.g. from http://www.mulesoft.org/documentation-3.2/display/32X/Bookstore+Example

<flow name="CatalogService">
    <composite-source>
        <!-- Public interface -->
        <inbound-endpoint address="http://0.0.0.0:8777/services/catalog" exchange-pattern="request-response">
            <cxf:jaxws-service serviceClass="org.mule.example.bookstore.CatalogService" />
        </inbound-endpoint>

        <!-- Administration interface -->
        <inbound-endpoint address="servlet://catalog" exchange-pattern="request-response">
            <!-- Convert request parameters to Book object -->
            <custom-transformer class="org.mule.example.bookstore.transformers.HttpRequestToBook" />
            <response>
                <!-- Format response to be a nice HTML page -->
                <custom-transformer class="org.mule.example.bookstore.transformers.AddBookResponse" />
                <!-- Force text/html, otherwise it falls back to request 
                    props, which have form-encoded one -->
                <transformer ref="setHtmlContentType" />
            </response>
        </inbound-endpoint>
    </composite-source>
    ....

Edit:

The following is a simple foreach example:

<flow name="foreachFlow1" doc:name="foreachFlow1">
    <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8081" doc:name="HTTP"/>
    <foreach collection="#[groovy:['localhost:8082', 'localhost:8083']]" doc:name="For Each">
        <http:outbound-endpoint exchange-pattern="request-response" address="http://#[payload]" method="GET" doc:name="HTTP"/>
    </foreach>
</flow>
<flow name="foreachFlow2" doc:name="foreachFlow2">
    <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8082" doc:name="HTTP"/>
    <logger message="in flow2" level="INFO"/>
</flow>
<flow name="foreachFlow3" doc:name="foreachFlow3">
    <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8083" doc:name="HTTP"/>
    <logger message="in flow3" level="INFO"/>
</flow>

Basically, the 'tricky' part is to figure out that the payload becomes the current item in the collection you're iterating over (the docs do a wonderful job at pointing that out... well at least if you're into fishing :P).