in short, Camel parses the from/to URIs to call a Java API that knows how to
speak that specific component's language (File I/O, HDFS, etc).
So, yes...formatting an appropriate (see camel-hdfs examples) URI to your
HDFS server will tell Camel to poll for files from "://in" directory and
send them to your HDFS server/directory.
Also, for remote apps...Camel allow you to interface as a consumer ('from'
clause) or a producer ('to' clause) with other applications over various
remote protocols (file, http, SOAP, REST, JMS, etc) without any changes
necessary on the remote app side.
Otherwise, if you want any app to use Camel directly, then you generally
just need camel-core and optionally any camel-<component> jars on the
classpath and to bootstrap the context (spring or programmatically, etc)...
see these links for more info:
http://camel.apache.org/what-are-the-dependencies.html
http://camel.apache.org/running-camel-standalone-and-have-it-keep-running.html
good luck...
mister blinky wrote
> Sorry for the probably very fundamental nature of these questions, but i
> have been reading stuff online all day and still am not sure.
>
> I am messing with Camel with HDFS, but my questions generally relate to
> using Camel to integrate any two (or more) systems that are remote (not on
> same machine, not running in same JVM). Assume that I am not using an ESB,
> because for my larger goal, an ESB is not an option. I need to get
> disparate systems to work with one another with no ESB.
>
> Here's a simplified scenario. I have a hadoop cluster and I have a server
> with a directory of files (dir name is "in"). As a PoC, I want to transfer
> those files to HDFS on my cluster and back to my server.
>
> To transfer the file to HDFS on the cluster, I assume I would use the
> Camel-hdfs component like this:
>
> from("file://in").to("hdfs://
> <IP-ADDR-OF-MY-HADOOP-NAMENODE>
> :9000/tmp/test");
>
> First question: I was confused initially (maybe i still am!) about how
> Camel would know *where* to transfer the file. My assumption is that I
> identify this by putting the IP addr of the remote system into the URL. Is
> this the general pattern?
>
> Second question: What is that URL in the to() supposed to be? Is it the
> URL of a web service -- in this case of HDFS's HTTP API? Or does Camel
> provide some web-addressable wrapper around services that are local to a
> machine?
>
> Third question: To get remote systems working together using Camel,
> generally do i have to install something Camel-related on each
> participating machine? If so, what? For example (a wild stab) would I have
> to put the Camel-hdfs compontent jar in the classpath? Or??
>
> Thanks for wading into my confusion.
-----
Ben O'Day
IT Consultant -http://consulting-notes.com
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